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| author | dwinter |
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| date | Tue, 04 Jan 2011 10:02:07 +0100 |
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<HTML> <BODY BGCOLOR="white"> <PRE> <FONT color="green">001</FONT> /*<a name="line.1"></a> <FONT color="green">002</FONT> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a> <FONT color="green">003</FONT> * contributor license agreements. See the NOTICE file distributed with<a name="line.3"></a> <FONT color="green">004</FONT> * this work for additional information regarding copyright ownership.<a name="line.4"></a> <FONT color="green">005</FONT> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a> <FONT color="green">006</FONT> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a> <FONT color="green">007</FONT> * the License. You may obtain a copy of the License at<a name="line.7"></a> <FONT color="green">008</FONT> *<a name="line.8"></a> <FONT color="green">009</FONT> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a> <FONT color="green">010</FONT> *<a name="line.10"></a> <FONT color="green">011</FONT> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a> <FONT color="green">012</FONT> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a> <FONT color="green">013</FONT> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a> <FONT color="green">014</FONT> * See the License for the specific language governing permissions and<a name="line.14"></a> <FONT color="green">015</FONT> * limitations under the License.<a name="line.15"></a> <FONT color="green">016</FONT> */<a name="line.16"></a> <FONT color="green">017</FONT> package org.apache.commons.math.util;<a name="line.17"></a> <FONT color="green">018</FONT> <a name="line.18"></a> <FONT color="green">019</FONT> import java.io.Serializable;<a name="line.19"></a> <FONT color="green">020</FONT> import java.util.Arrays;<a name="line.20"></a> <FONT color="green">021</FONT> <a name="line.21"></a> <FONT color="green">022</FONT> import org.apache.commons.math.MathRuntimeException;<a name="line.22"></a> <FONT color="green">023</FONT> <a name="line.23"></a> <FONT color="green">024</FONT> /**<a name="line.24"></a> <FONT color="green">025</FONT> * <p><a name="line.25"></a> <FONT color="green">026</FONT> * A variable length {@link DoubleArray} implementation that automatically<a name="line.26"></a> <FONT color="green">027</FONT> * handles expanding and contracting its internal storage array as elements<a name="line.27"></a> <FONT color="green">028</FONT> * are added and removed.<a name="line.28"></a> <FONT color="green">029</FONT> * </p><a name="line.29"></a> <FONT color="green">030</FONT> * <p><a name="line.30"></a> <FONT color="green">031</FONT> * The internal storage array starts with capacity determined by the<a name="line.31"></a> <FONT color="green">032</FONT> * <code>initialCapacity</code> property, which can be set by the constructor.<a name="line.32"></a> <FONT color="green">033</FONT> * The default initial capacity is 16. Adding elements using<a name="line.33"></a> <FONT color="green">034</FONT> * {@link #addElement(double)} appends elements to the end of the array. When<a name="line.34"></a> <FONT color="green">035</FONT> * there are no open entries at the end of the internal storage array, the<a name="line.35"></a> <FONT color="green">036</FONT> * array is expanded. The size of the expanded array depends on the<a name="line.36"></a> <FONT color="green">037</FONT> * <code>expansionMode</code> and <code>expansionFactor</code> properties.<a name="line.37"></a> <FONT color="green">038</FONT> * The <code>expansionMode</code> determines whether the size of the array is<a name="line.38"></a> <FONT color="green">039</FONT> * multiplied by the <code>expansionFactor</code> (MULTIPLICATIVE_MODE) or if<a name="line.39"></a> <FONT color="green">040</FONT> * the expansion is additive (ADDITIVE_MODE -- <code>expansionFactor</code><a name="line.40"></a> <FONT color="green">041</FONT> * storage locations added). The default <code>expansionMode</code> is<a name="line.41"></a> <FONT color="green">042</FONT> * MULTIPLICATIVE_MODE and the default <code>expansionFactor</code><a name="line.42"></a> <FONT color="green">043</FONT> * is 2.0.<a name="line.43"></a> <FONT color="green">044</FONT> * </p><a name="line.44"></a> <FONT color="green">045</FONT> * <p><a name="line.45"></a> <FONT color="green">046</FONT> * The {@link #addElementRolling(double)} method adds a new element to the end<a name="line.46"></a> <FONT color="green">047</FONT> * of the internal storage array and adjusts the "usable window" of the<a name="line.47"></a> <FONT color="green">048</FONT> * internal array forward by one position (effectively making what was the<a name="line.48"></a> <FONT color="green">049</FONT> * second element the first, and so on). Repeated activations of this method<a name="line.49"></a> <FONT color="green">050</FONT> * (or activation of {@link #discardFrontElements(int)}) will effectively orphan<a name="line.50"></a> <FONT color="green">051</FONT> * the storage locations at the beginning of the internal storage array. To<a name="line.51"></a> <FONT color="green">052</FONT> * reclaim this storage, each time one of these methods is activated, the size<a name="line.52"></a> <FONT color="green">053</FONT> * of the internal storage array is compared to the number of addressable<a name="line.53"></a> <FONT color="green">054</FONT> * elements (the <code>numElements</code> property) and if the difference<a name="line.54"></a> <FONT color="green">055</FONT> * is too large, the internal array is contracted to size<a name="line.55"></a> <FONT color="green">056</FONT> * <code>numElements + 1.</code> The determination of when the internal<a name="line.56"></a> <FONT color="green">057</FONT> * storage array is "too large" depends on the <code>expansionMode</code> and<a name="line.57"></a> <FONT color="green">058</FONT> * <code>contractionFactor</code> properties. If the <code>expansionMode</code><a name="line.58"></a> <FONT color="green">059</FONT> * is <code>MULTIPLICATIVE_MODE</code>, contraction is triggered when the<a name="line.59"></a> <FONT color="green">060</FONT> * ratio between storage array length and <code>numElements</code> exceeds<a name="line.60"></a> <FONT color="green">061</FONT> * <code>contractionFactor.</code> If the <code>expansionMode</code><a name="line.61"></a> <FONT color="green">062</FONT> * is <code>ADDITIVE_MODE,</code> the number of excess storage locations<a name="line.62"></a> <FONT color="green">063</FONT> * is compared to <code>contractionFactor.</code><a name="line.63"></a> <FONT color="green">064</FONT> * </p><a name="line.64"></a> <FONT color="green">065</FONT> * <p><a name="line.65"></a> <FONT color="green">066</FONT> * To avoid cycles of expansions and contractions, the<a name="line.66"></a> <FONT color="green">067</FONT> * <code>expansionFactor</code> must not exceed the<a name="line.67"></a> <FONT color="green">068</FONT> * <code>contractionFactor.</code> Constructors and mutators for both of these<a name="line.68"></a> <FONT color="green">069</FONT> * properties enforce this requirement, throwing IllegalArgumentException if it<a name="line.69"></a> <FONT color="green">070</FONT> * is violated.<a name="line.70"></a> <FONT color="green">071</FONT> * </p><a name="line.71"></a> <FONT color="green">072</FONT> * @version $Revision: 811833 $ $Date: 2009-09-06 12:27:50 -0400 (Sun, 06 Sep 2009) $<a name="line.72"></a> <FONT color="green">073</FONT> */<a name="line.73"></a> <FONT color="green">074</FONT> public class ResizableDoubleArray implements DoubleArray, Serializable {<a name="line.74"></a> <FONT color="green">075</FONT> <a name="line.75"></a> <FONT color="green">076</FONT> /** additive expansion mode */<a name="line.76"></a> <FONT color="green">077</FONT> public static final int ADDITIVE_MODE = 1;<a name="line.77"></a> <FONT color="green">078</FONT> <a name="line.78"></a> <FONT color="green">079</FONT> /** multiplicative expansion mode */<a name="line.79"></a> <FONT color="green">080</FONT> public static final int MULTIPLICATIVE_MODE = 0;<a name="line.80"></a> <FONT color="green">081</FONT> <a name="line.81"></a> <FONT color="green">082</FONT> /** Serializable version identifier */<a name="line.82"></a> <FONT color="green">083</FONT> private static final long serialVersionUID = -3485529955529426875L;<a name="line.83"></a> <FONT color="green">084</FONT> <a name="line.84"></a> <FONT color="green">085</FONT> /**<a name="line.85"></a> <FONT color="green">086</FONT> * The contraction criteria determines when the internal array will be<a name="line.86"></a> <FONT color="green">087</FONT> * contracted to fit the number of elements contained in the element<a name="line.87"></a> <FONT color="green">088</FONT> * array + 1.<a name="line.88"></a> <FONT color="green">089</FONT> */<a name="line.89"></a> <FONT color="green">090</FONT> protected float contractionCriteria = 2.5f;<a name="line.90"></a> <FONT color="green">091</FONT> <a name="line.91"></a> <FONT color="green">092</FONT> /**<a name="line.92"></a> <FONT color="green">093</FONT> * The expansion factor of the array. When the array needs to be expanded,<a name="line.93"></a> <FONT color="green">094</FONT> * the new array size will be<a name="line.94"></a> <FONT color="green">095</FONT> * <code>internalArray.length * expansionFactor</code><a name="line.95"></a> <FONT color="green">096</FONT> * if <code>expansionMode</code> is set to MULTIPLICATIVE_MODE, or<a name="line.96"></a> <FONT color="green">097</FONT> * <code>internalArray.length + expansionFactor</code> if<a name="line.97"></a> <FONT color="green">098</FONT> * <code>expansionMode</code> is set to ADDITIVE_MODE.<a name="line.98"></a> <FONT color="green">099</FONT> */<a name="line.99"></a> <FONT color="green">100</FONT> protected float expansionFactor = 2.0f;<a name="line.100"></a> <FONT color="green">101</FONT> <a name="line.101"></a> <FONT color="green">102</FONT> /**<a name="line.102"></a> <FONT color="green">103</FONT> * Determines whether array expansion by <code>expansionFactor</code><a name="line.103"></a> <FONT color="green">104</FONT> * is additive or multiplicative.<a name="line.104"></a> <FONT color="green">105</FONT> */<a name="line.105"></a> <FONT color="green">106</FONT> protected int expansionMode = MULTIPLICATIVE_MODE;<a name="line.106"></a> <FONT color="green">107</FONT> <a name="line.107"></a> <FONT color="green">108</FONT> /**<a name="line.108"></a> <FONT color="green">109</FONT> * The initial capacity of the array. Initial capacity is not exposed as a<a name="line.109"></a> <FONT color="green">110</FONT> * property as it is only meaningful when passed to a constructor.<a name="line.110"></a> <FONT color="green">111</FONT> */<a name="line.111"></a> <FONT color="green">112</FONT> protected int initialCapacity = 16;<a name="line.112"></a> <FONT color="green">113</FONT> <a name="line.113"></a> <FONT color="green">114</FONT> /**<a name="line.114"></a> <FONT color="green">115</FONT> * The internal storage array.<a name="line.115"></a> <FONT color="green">116</FONT> */<a name="line.116"></a> <FONT color="green">117</FONT> protected double[] internalArray;<a name="line.117"></a> <FONT color="green">118</FONT> <a name="line.118"></a> <FONT color="green">119</FONT> /**<a name="line.119"></a> <FONT color="green">120</FONT> * The number of addressable elements in the array. Note that this<a name="line.120"></a> <FONT color="green">121</FONT> * has nothing to do with the length of the internal storage array.<a name="line.121"></a> <FONT color="green">122</FONT> */<a name="line.122"></a> <FONT color="green">123</FONT> protected int numElements = 0;<a name="line.123"></a> <FONT color="green">124</FONT> <a name="line.124"></a> <FONT color="green">125</FONT> /**<a name="line.125"></a> <FONT color="green">126</FONT> * The position of the first addressable element in the internal storage<a name="line.126"></a> <FONT color="green">127</FONT> * array. The addressable elements in the array are <code><a name="line.127"></a> <FONT color="green">128</FONT> * internalArray[startIndex],...,internalArray[startIndex + numElements -1]<a name="line.128"></a> <FONT color="green">129</FONT> * </code><a name="line.129"></a> <FONT color="green">130</FONT> */<a name="line.130"></a> <FONT color="green">131</FONT> protected int startIndex = 0;<a name="line.131"></a> <FONT color="green">132</FONT> <a name="line.132"></a> <FONT color="green">133</FONT> /**<a name="line.133"></a> <FONT color="green">134</FONT> * Create a ResizableArray with default properties.<a name="line.134"></a> <FONT color="green">135</FONT> * <ul><a name="line.135"></a> <FONT color="green">136</FONT> * <li><code>initialCapacity = 16</code></li><a name="line.136"></a> <FONT color="green">137</FONT> * <li><code>expansionMode = MULTIPLICATIVE_MODE</code></li><a name="line.137"></a> <FONT color="green">138</FONT> * <li><code>expansionFactor = 2.5</code></li><a name="line.138"></a> <FONT color="green">139</FONT> * <li><code>contractionFactor = 2.0</code></li><a name="line.139"></a> <FONT color="green">140</FONT> * </ul><a name="line.140"></a> <FONT color="green">141</FONT> */<a name="line.141"></a> <FONT color="green">142</FONT> public ResizableDoubleArray() {<a name="line.142"></a> <FONT color="green">143</FONT> internalArray = new double[initialCapacity];<a name="line.143"></a> <FONT color="green">144</FONT> }<a name="line.144"></a> <FONT color="green">145</FONT> <a name="line.145"></a> <FONT color="green">146</FONT> /**<a name="line.146"></a> <FONT color="green">147</FONT> * Create a ResizableArray with the specified initial capacity. Other<a name="line.147"></a> <FONT color="green">148</FONT> * properties take default values:<a name="line.148"></a> <FONT color="green">149</FONT> * <ul><a name="line.149"></a> <FONT color="green">150</FONT> * <li><code>expansionMode = MULTIPLICATIVE_MODE</code></li><a name="line.150"></a> <FONT color="green">151</FONT> * <li><code>expansionFactor = 2.5</code></li><a name="line.151"></a> <FONT color="green">152</FONT> * <li><code>contractionFactor = 2.0</code></li><a name="line.152"></a> <FONT color="green">153</FONT> * </ul><a name="line.153"></a> <FONT color="green">154</FONT> * @param initialCapacity The initial size of the internal storage array<a name="line.154"></a> <FONT color="green">155</FONT> * @throws IllegalArgumentException if initialCapacity is not > 0<a name="line.155"></a> <FONT color="green">156</FONT> */<a name="line.156"></a> <FONT color="green">157</FONT> public ResizableDoubleArray(int initialCapacity) {<a name="line.157"></a> <FONT color="green">158</FONT> setInitialCapacity(initialCapacity);<a name="line.158"></a> <FONT color="green">159</FONT> internalArray = new double[this.initialCapacity];<a name="line.159"></a> <FONT color="green">160</FONT> }<a name="line.160"></a> <FONT color="green">161</FONT> <a name="line.161"></a> <FONT color="green">162</FONT> /**<a name="line.162"></a> <FONT color="green">163</FONT> * <p><a name="line.163"></a> <FONT color="green">164</FONT> * Create a ResizableArray with the specified initial capacity<a name="line.164"></a> <FONT color="green">165</FONT> * and expansion factor. The remaining properties take default<a name="line.165"></a> <FONT color="green">166</FONT> * values:<a name="line.166"></a> <FONT color="green">167</FONT> * <ul><a name="line.167"></a> <FONT color="green">168</FONT> * <li><code>expansionMode = MULTIPLICATIVE_MODE</code></li><a name="line.168"></a> <FONT color="green">169</FONT> * <li><code>contractionFactor = 0.5 + expansionFactor</code></li><a name="line.169"></a> <FONT color="green">170</FONT> * </ul></p><a name="line.170"></a> <FONT color="green">171</FONT> * <p><a name="line.171"></a> <FONT color="green">172</FONT> * Throws IllegalArgumentException if the following conditions are<a name="line.172"></a> <FONT color="green">173</FONT> * not met:<a name="line.173"></a> <FONT color="green">174</FONT> * <ul><a name="line.174"></a> <FONT color="green">175</FONT> * <li><code>initialCapacity > 0</code></li><a name="line.175"></a> <FONT color="green">176</FONT> * <li><code>expansionFactor > 1</code></li><a name="line.176"></a> <FONT color="green">177</FONT> * </ul></p><a name="line.177"></a> <FONT color="green">178</FONT> *<a name="line.178"></a> <FONT color="green">179</FONT> * @param initialCapacity The initial size of the internal storage array<a name="line.179"></a> <FONT color="green">180</FONT> * @param expansionFactor the array will be expanded based on this<a name="line.180"></a> <FONT color="green">181</FONT> * parameter<a name="line.181"></a> <FONT color="green">182</FONT> * @throws IllegalArgumentException if parameters are not valid<a name="line.182"></a> <FONT color="green">183</FONT> */<a name="line.183"></a> <FONT color="green">184</FONT> public ResizableDoubleArray(int initialCapacity, float expansionFactor) {<a name="line.184"></a> <FONT color="green">185</FONT> this.expansionFactor = expansionFactor;<a name="line.185"></a> <FONT color="green">186</FONT> setInitialCapacity(initialCapacity);<a name="line.186"></a> <FONT color="green">187</FONT> internalArray = new double[initialCapacity];<a name="line.187"></a> <FONT color="green">188</FONT> setContractionCriteria(expansionFactor +0.5f);<a name="line.188"></a> <FONT color="green">189</FONT> }<a name="line.189"></a> <FONT color="green">190</FONT> <a name="line.190"></a> <FONT color="green">191</FONT> /**<a name="line.191"></a> <FONT color="green">192</FONT> * <p><a name="line.192"></a> <FONT color="green">193</FONT> * Create a ResizableArray with the specified initialCapacity,<a name="line.193"></a> <FONT color="green">194</FONT> * expansionFactor, and contractionCriteria. The <code>expansionMode</code><a name="line.194"></a> <FONT color="green">195</FONT> * will default to <code>MULTIPLICATIVE_MODE.</code></p><a name="line.195"></a> <FONT color="green">196</FONT> * <p><a name="line.196"></a> <FONT color="green">197</FONT> * Throws IllegalArgumentException if the following conditions are<a name="line.197"></a> <FONT color="green">198</FONT> * not met:<a name="line.198"></a> <FONT color="green">199</FONT> * <ul><a name="line.199"></a> <FONT color="green">200</FONT> * <li><code>initialCapacity > 0</code></li><a name="line.200"></a> <FONT color="green">201</FONT> * <li><code>expansionFactor > 1</code></li><a name="line.201"></a> <FONT color="green">202</FONT> * <li><code>contractionFactor >= expansionFactor</code></li><a name="line.202"></a> <FONT color="green">203</FONT> * </ul></p><a name="line.203"></a> <FONT color="green">204</FONT> * @param initialCapacity The initial size of the internal storage array<a name="line.204"></a> <FONT color="green">205</FONT> * @param expansionFactor the array will be expanded based on this<a name="line.205"></a> <FONT color="green">206</FONT> * parameter<a name="line.206"></a> <FONT color="green">207</FONT> * @param contractionCriteria The contraction Criteria.<a name="line.207"></a> <FONT color="green">208</FONT> * @throws IllegalArgumentException if parameters are not valid<a name="line.208"></a> <FONT color="green">209</FONT> */<a name="line.209"></a> <FONT color="green">210</FONT> public ResizableDoubleArray(int initialCapacity, float expansionFactor,<a name="line.210"></a> <FONT color="green">211</FONT> float contractionCriteria) {<a name="line.211"></a> <FONT color="green">212</FONT> this.expansionFactor = expansionFactor;<a name="line.212"></a> <FONT color="green">213</FONT> setContractionCriteria(contractionCriteria);<a name="line.213"></a> <FONT color="green">214</FONT> setInitialCapacity(initialCapacity);<a name="line.214"></a> <FONT color="green">215</FONT> internalArray = new double[initialCapacity];<a name="line.215"></a> <FONT color="green">216</FONT> }<a name="line.216"></a> <FONT color="green">217</FONT> <a name="line.217"></a> <FONT color="green">218</FONT> /**<a name="line.218"></a> <FONT color="green">219</FONT> * <p><a name="line.219"></a> <FONT color="green">220</FONT> * Create a ResizableArray with the specified properties.</p><a name="line.220"></a> <FONT color="green">221</FONT> * <p><a name="line.221"></a> <FONT color="green">222</FONT> * Throws IllegalArgumentException if the following conditions are<a name="line.222"></a> <FONT color="green">223</FONT> * not met:<a name="line.223"></a> <FONT color="green">224</FONT> * <ul><a name="line.224"></a> <FONT color="green">225</FONT> * <li><code>initialCapacity > 0</code></li><a name="line.225"></a> <FONT color="green">226</FONT> * <li><code>expansionFactor > 1</code></li><a name="line.226"></a> <FONT color="green">227</FONT> * <li><code>contractionFactor >= expansionFactor</code></li><a name="line.227"></a> <FONT color="green">228</FONT> * <li><code>expansionMode in {MULTIPLICATIVE_MODE, ADDITIVE_MODE}</code><a name="line.228"></a> <FONT color="green">229</FONT> * </li><a name="line.229"></a> <FONT color="green">230</FONT> * </ul></p><a name="line.230"></a> <FONT color="green">231</FONT> *<a name="line.231"></a> <FONT color="green">232</FONT> * @param initialCapacity the initial size of the internal storage array<a name="line.232"></a> <FONT color="green">233</FONT> * @param expansionFactor the array will be expanded based on this<a name="line.233"></a> <FONT color="green">234</FONT> * parameter<a name="line.234"></a> <FONT color="green">235</FONT> * @param contractionCriteria the contraction Criteria<a name="line.235"></a> <FONT color="green">236</FONT> * @param expansionMode the expansion mode<a name="line.236"></a> <FONT color="green">237</FONT> * @throws IllegalArgumentException if parameters are not valid<a name="line.237"></a> <FONT color="green">238</FONT> */<a name="line.238"></a> <FONT color="green">239</FONT> public ResizableDoubleArray(int initialCapacity, float expansionFactor,<a name="line.239"></a> <FONT color="green">240</FONT> float contractionCriteria, int expansionMode) {<a name="line.240"></a> <FONT color="green">241</FONT> this.expansionFactor = expansionFactor;<a name="line.241"></a> <FONT color="green">242</FONT> setContractionCriteria(contractionCriteria);<a name="line.242"></a> <FONT color="green">243</FONT> setInitialCapacity(initialCapacity);<a name="line.243"></a> <FONT color="green">244</FONT> setExpansionMode(expansionMode);<a name="line.244"></a> <FONT color="green">245</FONT> internalArray = new double[initialCapacity];<a name="line.245"></a> <FONT color="green">246</FONT> }<a name="line.246"></a> <FONT color="green">247</FONT> <a name="line.247"></a> <FONT color="green">248</FONT> /**<a name="line.248"></a> <FONT color="green">249</FONT> * Copy constructor. Creates a new ResizableDoubleArray that is a deep,<a name="line.249"></a> <FONT color="green">250</FONT> * fresh copy of the original. Needs to acquire synchronization lock<a name="line.250"></a> <FONT color="green">251</FONT> * on original. Original may not be null; otherwise a NullPointerException<a name="line.251"></a> <FONT color="green">252</FONT> * is thrown.<a name="line.252"></a> <FONT color="green">253</FONT> *<a name="line.253"></a> <FONT color="green">254</FONT> * @param original array to copy<a name="line.254"></a> <FONT color="green">255</FONT> * @since 2.0<a name="line.255"></a> <FONT color="green">256</FONT> */<a name="line.256"></a> <FONT color="green">257</FONT> public ResizableDoubleArray(ResizableDoubleArray original) {<a name="line.257"></a> <FONT color="green">258</FONT> copy(original, this);<a name="line.258"></a> <FONT color="green">259</FONT> }<a name="line.259"></a> <FONT color="green">260</FONT> <a name="line.260"></a> <FONT color="green">261</FONT> /**<a name="line.261"></a> <FONT color="green">262</FONT> * Adds an element to the end of this expandable array.<a name="line.262"></a> <FONT color="green">263</FONT> *<a name="line.263"></a> <FONT color="green">264</FONT> * @param value to be added to end of array<a name="line.264"></a> <FONT color="green">265</FONT> */<a name="line.265"></a> <FONT color="green">266</FONT> public synchronized void addElement(double value) {<a name="line.266"></a> <FONT color="green">267</FONT> numElements++;<a name="line.267"></a> <FONT color="green">268</FONT> if ((startIndex + numElements) > internalArray.length) {<a name="line.268"></a> <FONT color="green">269</FONT> expand();<a name="line.269"></a> <FONT color="green">270</FONT> }<a name="line.270"></a> <FONT color="green">271</FONT> internalArray[startIndex + (numElements - 1)] = value;<a name="line.271"></a> <FONT color="green">272</FONT> if (shouldContract()) {<a name="line.272"></a> <FONT color="green">273</FONT> contract();<a name="line.273"></a> <FONT color="green">274</FONT> }<a name="line.274"></a> <FONT color="green">275</FONT> }<a name="line.275"></a> <FONT color="green">276</FONT> <a name="line.276"></a> <FONT color="green">277</FONT> /**<a name="line.277"></a> <FONT color="green">278</FONT> * <p><a name="line.278"></a> <FONT color="green">279</FONT> * Adds an element to the end of the array and removes the first<a name="line.279"></a> <FONT color="green">280</FONT> * element in the array. Returns the discarded first element.<a name="line.280"></a> <FONT color="green">281</FONT> * The effect is similar to a push operation in a FIFO queue.<a name="line.281"></a> <FONT color="green">282</FONT> * </p><a name="line.282"></a> <FONT color="green">283</FONT> * <p><a name="line.283"></a> <FONT color="green">284</FONT> * Example: If the array contains the elements 1, 2, 3, 4 (in that order)<a name="line.284"></a> <FONT color="green">285</FONT> * and addElementRolling(5) is invoked, the result is an array containing<a name="line.285"></a> <FONT color="green">286</FONT> * the entries 2, 3, 4, 5 and the value returned is 1.<a name="line.286"></a> <FONT color="green">287</FONT> * </p><a name="line.287"></a> <FONT color="green">288</FONT> *<a name="line.288"></a> <FONT color="green">289</FONT> * @param value the value to be added to the array<a name="line.289"></a> <FONT color="green">290</FONT> * @return the value which has been discarded or "pushed" out of the array<a name="line.290"></a> <FONT color="green">291</FONT> * by this rolling insert<a name="line.291"></a> <FONT color="green">292</FONT> */<a name="line.292"></a> <FONT color="green">293</FONT> public synchronized double addElementRolling(double value) {<a name="line.293"></a> <FONT color="green">294</FONT> double discarded = internalArray[startIndex];<a name="line.294"></a> <FONT color="green">295</FONT> <a name="line.295"></a> <FONT color="green">296</FONT> if ((startIndex + (numElements + 1)) > internalArray.length) {<a name="line.296"></a> <FONT color="green">297</FONT> expand();<a name="line.297"></a> <FONT color="green">298</FONT> }<a name="line.298"></a> <FONT color="green">299</FONT> // Increment the start index<a name="line.299"></a> <FONT color="green">300</FONT> startIndex += 1;<a name="line.300"></a> <FONT color="green">301</FONT> <a name="line.301"></a> <FONT color="green">302</FONT> // Add the new value<a name="line.302"></a> <FONT color="green">303</FONT> internalArray[startIndex + (numElements - 1)] = value;<a name="line.303"></a> <FONT color="green">304</FONT> <a name="line.304"></a> <FONT color="green">305</FONT> // Check the contraction criteria<a name="line.305"></a> <FONT color="green">306</FONT> if (shouldContract()) {<a name="line.306"></a> <FONT color="green">307</FONT> contract();<a name="line.307"></a> <FONT color="green">308</FONT> }<a name="line.308"></a> <FONT color="green">309</FONT> return discarded;<a name="line.309"></a> <FONT color="green">310</FONT> }<a name="line.310"></a> <FONT color="green">311</FONT> <a name="line.311"></a> <FONT color="green">312</FONT> /**<a name="line.312"></a> <FONT color="green">313</FONT> * Substitutes <code>value</code> for the most recently added value.<a name="line.313"></a> <FONT color="green">314</FONT> * Returns the value that has been replaced. If the array is empty (i.e.<a name="line.314"></a> <FONT color="green">315</FONT> * if {@link #numElements} is zero), a MathRuntimeException is thrown.<a name="line.315"></a> <FONT color="green">316</FONT> *<a name="line.316"></a> <FONT color="green">317</FONT> * @param value new value to substitute for the most recently added value<a name="line.317"></a> <FONT color="green">318</FONT> * @return value that has been replaced in the array<a name="line.318"></a> <FONT color="green">319</FONT> * @since 2.0<a name="line.319"></a> <FONT color="green">320</FONT> */<a name="line.320"></a> <FONT color="green">321</FONT> public synchronized double substituteMostRecentElement(double value) {<a name="line.321"></a> <FONT color="green">322</FONT> if (numElements < 1) {<a name="line.322"></a> <FONT color="green">323</FONT> throw MathRuntimeException.createArrayIndexOutOfBoundsException(<a name="line.323"></a> <FONT color="green">324</FONT> "cannot substitute an element from an empty array");<a name="line.324"></a> <FONT color="green">325</FONT> }<a name="line.325"></a> <FONT color="green">326</FONT> <a name="line.326"></a> <FONT color="green">327</FONT> double discarded = internalArray[startIndex + (numElements - 1)];<a name="line.327"></a> <FONT color="green">328</FONT> <a name="line.328"></a> <FONT color="green">329</FONT> internalArray[startIndex + (numElements - 1)] = value;<a name="line.329"></a> <FONT color="green">330</FONT> <a name="line.330"></a> <FONT color="green">331</FONT> return discarded;<a name="line.331"></a> <FONT color="green">332</FONT> }<a name="line.332"></a> <FONT color="green">333</FONT> <a name="line.333"></a> <FONT color="green">334</FONT> <a name="line.334"></a> <FONT color="green">335</FONT> /**<a name="line.335"></a> <FONT color="green">336</FONT> * Checks the expansion factor and the contraction criteria and throws an<a name="line.336"></a> <FONT color="green">337</FONT> * IllegalArgumentException if the contractionCriteria is less than the<a name="line.337"></a> <FONT color="green">338</FONT> * expansionCriteria<a name="line.338"></a> <FONT color="green">339</FONT> *<a name="line.339"></a> <FONT color="green">340</FONT> * @param expansion factor to be checked<a name="line.340"></a> <FONT color="green">341</FONT> * @param contraction criteria to be checked<a name="line.341"></a> <FONT color="green">342</FONT> * @throws IllegalArgumentException if the contractionCriteria is less than<a name="line.342"></a> <FONT color="green">343</FONT> * the expansionCriteria.<a name="line.343"></a> <FONT color="green">344</FONT> */<a name="line.344"></a> <FONT color="green">345</FONT> protected void checkContractExpand(float contraction, float expansion) {<a name="line.345"></a> <FONT color="green">346</FONT> <a name="line.346"></a> <FONT color="green">347</FONT> if (contraction < expansion) {<a name="line.347"></a> <FONT color="green">348</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.348"></a> <FONT color="green">349</FONT> "contraction criteria ({0}) smaller than the expansion factor ({1}). This would " +<a name="line.349"></a> <FONT color="green">350</FONT> "lead to a never ending loop of expansion and contraction as a newly expanded " +<a name="line.350"></a> <FONT color="green">351</FONT> "internal storage array would immediately satisfy the criteria for contraction",<a name="line.351"></a> <FONT color="green">352</FONT> contraction, expansion);<a name="line.352"></a> <FONT color="green">353</FONT> }<a name="line.353"></a> <FONT color="green">354</FONT> <a name="line.354"></a> <FONT color="green">355</FONT> if (contraction <= 1.0) {<a name="line.355"></a> <FONT color="green">356</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.356"></a> <FONT color="green">357</FONT> "contraction criteria smaller than one ({0}). This would lead to a never ending " +<a name="line.357"></a> <FONT color="green">358</FONT> "loop of expansion and contraction as an internal storage array length equal " +<a name="line.358"></a> <FONT color="green">359</FONT> "to the number of elements would satisfy the contraction criteria.",<a name="line.359"></a> <FONT color="green">360</FONT> contraction);<a name="line.360"></a> <FONT color="green">361</FONT> }<a name="line.361"></a> <FONT color="green">362</FONT> <a name="line.362"></a> <FONT color="green">363</FONT> if (expansion <= 1.0) {<a name="line.363"></a> <FONT color="green">364</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.364"></a> <FONT color="green">365</FONT> "expansion factor smaller than one ({0})",<a name="line.365"></a> <FONT color="green">366</FONT> expansion);<a name="line.366"></a> <FONT color="green">367</FONT> }<a name="line.367"></a> <FONT color="green">368</FONT> }<a name="line.368"></a> <FONT color="green">369</FONT> <a name="line.369"></a> <FONT color="green">370</FONT> /**<a name="line.370"></a> <FONT color="green">371</FONT> * Clear the array, reset the size to the initialCapacity and the number<a name="line.371"></a> <FONT color="green">372</FONT> * of elements to zero.<a name="line.372"></a> <FONT color="green">373</FONT> */<a name="line.373"></a> <FONT color="green">374</FONT> public synchronized void clear() {<a name="line.374"></a> <FONT color="green">375</FONT> numElements = 0;<a name="line.375"></a> <FONT color="green">376</FONT> startIndex = 0;<a name="line.376"></a> <FONT color="green">377</FONT> internalArray = new double[initialCapacity];<a name="line.377"></a> <FONT color="green">378</FONT> }<a name="line.378"></a> <FONT color="green">379</FONT> <a name="line.379"></a> <FONT color="green">380</FONT> /**<a name="line.380"></a> <FONT color="green">381</FONT> * Contracts the storage array to the (size of the element set) + 1 - to<a name="line.381"></a> <FONT color="green">382</FONT> * avoid a zero length array. This function also resets the startIndex to<a name="line.382"></a> <FONT color="green">383</FONT> * zero.<a name="line.383"></a> <FONT color="green">384</FONT> */<a name="line.384"></a> <FONT color="green">385</FONT> public synchronized void contract() {<a name="line.385"></a> <FONT color="green">386</FONT> double[] tempArray = new double[numElements + 1];<a name="line.386"></a> <FONT color="green">387</FONT> <a name="line.387"></a> <FONT color="green">388</FONT> // Copy and swap - copy only the element array from the src array.<a name="line.388"></a> <FONT color="green">389</FONT> System.arraycopy(internalArray, startIndex, tempArray, 0, numElements);<a name="line.389"></a> <FONT color="green">390</FONT> internalArray = tempArray;<a name="line.390"></a> <FONT color="green">391</FONT> <a name="line.391"></a> <FONT color="green">392</FONT> // Reset the start index to zero<a name="line.392"></a> <FONT color="green">393</FONT> startIndex = 0;<a name="line.393"></a> <FONT color="green">394</FONT> }<a name="line.394"></a> <FONT color="green">395</FONT> <a name="line.395"></a> <FONT color="green">396</FONT> /**<a name="line.396"></a> <FONT color="green">397</FONT> * Discards the <code>i<code> initial elements of the array. For example,<a name="line.397"></a> <FONT color="green">398</FONT> * if the array contains the elements 1,2,3,4, invoking<a name="line.398"></a> <FONT color="green">399</FONT> * <code>discardFrontElements(2)</code> will cause the first two elements<a name="line.399"></a> <FONT color="green">400</FONT> * to be discarded, leaving 3,4 in the array. Throws illegalArgumentException<a name="line.400"></a> <FONT color="green">401</FONT> * if i exceeds numElements.<a name="line.401"></a> <FONT color="green">402</FONT> *<a name="line.402"></a> <FONT color="green">403</FONT> * @param i the number of elements to discard from the front of the array<a name="line.403"></a> <FONT color="green">404</FONT> * @throws IllegalArgumentException if i is greater than numElements.<a name="line.404"></a> <FONT color="green">405</FONT> * @since 2.0<a name="line.405"></a> <FONT color="green">406</FONT> */<a name="line.406"></a> <FONT color="green">407</FONT> public synchronized void discardFrontElements(int i) {<a name="line.407"></a> <FONT color="green">408</FONT> <a name="line.408"></a> <FONT color="green">409</FONT> discardExtremeElements(i,true);<a name="line.409"></a> <FONT color="green">410</FONT> <a name="line.410"></a> <FONT color="green">411</FONT> }<a name="line.411"></a> <FONT color="green">412</FONT> <a name="line.412"></a> <FONT color="green">413</FONT> /**<a name="line.413"></a> <FONT color="green">414</FONT> * Discards the <code>i<code> last elements of the array. For example,<a name="line.414"></a> <FONT color="green">415</FONT> * if the array contains the elements 1,2,3,4, invoking<a name="line.415"></a> <FONT color="green">416</FONT> * <code>discardMostRecentElements(2)</code> will cause the last two elements<a name="line.416"></a> <FONT color="green">417</FONT> * to be discarded, leaving 1,2 in the array. Throws illegalArgumentException<a name="line.417"></a> <FONT color="green">418</FONT> * if i exceeds numElements.<a name="line.418"></a> <FONT color="green">419</FONT> *<a name="line.419"></a> <FONT color="green">420</FONT> * @param i the number of elements to discard from the end of the array<a name="line.420"></a> <FONT color="green">421</FONT> * @throws IllegalArgumentException if i is greater than numElements.<a name="line.421"></a> <FONT color="green">422</FONT> * @since 2.0<a name="line.422"></a> <FONT color="green">423</FONT> */<a name="line.423"></a> <FONT color="green">424</FONT> public synchronized void discardMostRecentElements(int i) {<a name="line.424"></a> <FONT color="green">425</FONT> <a name="line.425"></a> <FONT color="green">426</FONT> discardExtremeElements(i,false);<a name="line.426"></a> <FONT color="green">427</FONT> <a name="line.427"></a> <FONT color="green">428</FONT> }<a name="line.428"></a> <FONT color="green">429</FONT> <a name="line.429"></a> <FONT color="green">430</FONT> /**<a name="line.430"></a> <FONT color="green">431</FONT> * Discards the <code>i<code> first or last elements of the array,<a name="line.431"></a> <FONT color="green">432</FONT> * depending on the value of <code>front</code>.<a name="line.432"></a> <FONT color="green">433</FONT> * For example, if the array contains the elements 1,2,3,4, invoking<a name="line.433"></a> <FONT color="green">434</FONT> * <code>discardExtremeElements(2,false)</code> will cause the last two elements<a name="line.434"></a> <FONT color="green">435</FONT> * to be discarded, leaving 1,2 in the array.<a name="line.435"></a> <FONT color="green">436</FONT> * For example, if the array contains the elements 1,2,3,4, invoking<a name="line.436"></a> <FONT color="green">437</FONT> * <code>discardExtremeElements(2,true)</code> will cause the first two elements<a name="line.437"></a> <FONT color="green">438</FONT> * to be discarded, leaving 3,4 in the array.<a name="line.438"></a> <FONT color="green">439</FONT> * Throws illegalArgumentException<a name="line.439"></a> <FONT color="green">440</FONT> * if i exceeds numElements.<a name="line.440"></a> <FONT color="green">441</FONT> *<a name="line.441"></a> <FONT color="green">442</FONT> * @param i the number of elements to discard from the front/end of the array<a name="line.442"></a> <FONT color="green">443</FONT> * @param front true if elements are to be discarded from the front<a name="line.443"></a> <FONT color="green">444</FONT> * of the array, false if elements are to be discarded from the end<a name="line.444"></a> <FONT color="green">445</FONT> * of the array<a name="line.445"></a> <FONT color="green">446</FONT> * @throws IllegalArgumentException if i is greater than numElements.<a name="line.446"></a> <FONT color="green">447</FONT> * @since 2.0<a name="line.447"></a> <FONT color="green">448</FONT> */<a name="line.448"></a> <FONT color="green">449</FONT> private synchronized void discardExtremeElements(int i,boolean front) {<a name="line.449"></a> <FONT color="green">450</FONT> if (i > numElements) {<a name="line.450"></a> <FONT color="green">451</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.451"></a> <FONT color="green">452</FONT> "cannot discard {0} elements from a {1} elements array",<a name="line.452"></a> <FONT color="green">453</FONT> i, numElements);<a name="line.453"></a> <FONT color="green">454</FONT> } else if (i < 0) {<a name="line.454"></a> <FONT color="green">455</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.455"></a> <FONT color="green">456</FONT> "cannot discard a negative number of elements ({0})",<a name="line.456"></a> <FONT color="green">457</FONT> i);<a name="line.457"></a> <FONT color="green">458</FONT> } else {<a name="line.458"></a> <FONT color="green">459</FONT> // "Subtract" this number of discarded from numElements<a name="line.459"></a> <FONT color="green">460</FONT> numElements -= i;<a name="line.460"></a> <FONT color="green">461</FONT> if (front) startIndex += i;<a name="line.461"></a> <FONT color="green">462</FONT> }<a name="line.462"></a> <FONT color="green">463</FONT> if (shouldContract()) {<a name="line.463"></a> <FONT color="green">464</FONT> contract();<a name="line.464"></a> <FONT color="green">465</FONT> }<a name="line.465"></a> <FONT color="green">466</FONT> }<a name="line.466"></a> <FONT color="green">467</FONT> <a name="line.467"></a> <FONT color="green">468</FONT> /**<a name="line.468"></a> <FONT color="green">469</FONT> * Expands the internal storage array using the expansion factor.<a name="line.469"></a> <FONT color="green">470</FONT> * <p><a name="line.470"></a> <FONT color="green">471</FONT> * if <code>expansionMode</code> is set to MULTIPLICATIVE_MODE,<a name="line.471"></a> <FONT color="green">472</FONT> * the new array size will be <code>internalArray.length * expansionFactor.</code><a name="line.472"></a> <FONT color="green">473</FONT> * If <code>expansionMode</code> is set to ADDITIVE_MODE, the length<a name="line.473"></a> <FONT color="green">474</FONT> * after expansion will be <code>internalArray.length + expansionFactor</code><a name="line.474"></a> <FONT color="green">475</FONT> * </p><a name="line.475"></a> <FONT color="green">476</FONT> */<a name="line.476"></a> <FONT color="green">477</FONT> protected synchronized void expand() {<a name="line.477"></a> <FONT color="green">478</FONT> <a name="line.478"></a> <FONT color="green">479</FONT> // notice the use of Math.ceil(), this guarantees that we will always<a name="line.479"></a> <FONT color="green">480</FONT> // have an array of at least currentSize + 1. Assume that the<a name="line.480"></a> <FONT color="green">481</FONT> // current initial capacity is 1 and the expansion factor<a name="line.481"></a> <FONT color="green">482</FONT> // is 1.000000000000000001. The newly calculated size will be<a name="line.482"></a> <FONT color="green">483</FONT> // rounded up to 2 after the multiplication is performed.<a name="line.483"></a> <FONT color="green">484</FONT> int newSize = 0;<a name="line.484"></a> <FONT color="green">485</FONT> if (expansionMode == MULTIPLICATIVE_MODE) {<a name="line.485"></a> <FONT color="green">486</FONT> newSize = (int) Math.ceil(internalArray.length * expansionFactor);<a name="line.486"></a> <FONT color="green">487</FONT> } else {<a name="line.487"></a> <FONT color="green">488</FONT> newSize = internalArray.length + Math.round(expansionFactor);<a name="line.488"></a> <FONT color="green">489</FONT> }<a name="line.489"></a> <FONT color="green">490</FONT> double[] tempArray = new double[newSize];<a name="line.490"></a> <FONT color="green">491</FONT> <a name="line.491"></a> <FONT color="green">492</FONT> // Copy and swap<a name="line.492"></a> <FONT color="green">493</FONT> System.arraycopy(internalArray, 0, tempArray, 0, internalArray.length);<a name="line.493"></a> <FONT color="green">494</FONT> internalArray = tempArray;<a name="line.494"></a> <FONT color="green">495</FONT> }<a name="line.495"></a> <FONT color="green">496</FONT> <a name="line.496"></a> <FONT color="green">497</FONT> /**<a name="line.497"></a> <FONT color="green">498</FONT> * Expands the internal storage array to the specified size.<a name="line.498"></a> <FONT color="green">499</FONT> *<a name="line.499"></a> <FONT color="green">500</FONT> * @param size Size of the new internal storage array<a name="line.500"></a> <FONT color="green">501</FONT> */<a name="line.501"></a> <FONT color="green">502</FONT> private synchronized void expandTo(int size) {<a name="line.502"></a> <FONT color="green">503</FONT> double[] tempArray = new double[size];<a name="line.503"></a> <FONT color="green">504</FONT> // Copy and swap<a name="line.504"></a> <FONT color="green">505</FONT> System.arraycopy(internalArray, 0, tempArray, 0, internalArray.length);<a name="line.505"></a> <FONT color="green">506</FONT> internalArray = tempArray;<a name="line.506"></a> <FONT color="green">507</FONT> }<a name="line.507"></a> <FONT color="green">508</FONT> <a name="line.508"></a> <FONT color="green">509</FONT> /**<a name="line.509"></a> <FONT color="green">510</FONT> * The contraction criteria defines when the internal array will contract<a name="line.510"></a> <FONT color="green">511</FONT> * to store only the number of elements in the element array.<a name="line.511"></a> <FONT color="green">512</FONT> * If the <code>expansionMode</code> is <code>MULTIPLICATIVE_MODE</code>,<a name="line.512"></a> <FONT color="green">513</FONT> * contraction is triggered when the ratio between storage array length<a name="line.513"></a> <FONT color="green">514</FONT> * and <code>numElements</code> exceeds <code>contractionFactor</code>.<a name="line.514"></a> <FONT color="green">515</FONT> * If the <code>expansionMode</code> is <code>ADDITIVE_MODE</code>, the<a name="line.515"></a> <FONT color="green">516</FONT> * number of excess storage locations is compared to<a name="line.516"></a> <FONT color="green">517</FONT> * <code>contractionFactor.</code><a name="line.517"></a> <FONT color="green">518</FONT> *<a name="line.518"></a> <FONT color="green">519</FONT> * @return the contraction criteria used to reclaim memory.<a name="line.519"></a> <FONT color="green">520</FONT> */<a name="line.520"></a> <FONT color="green">521</FONT> public float getContractionCriteria() {<a name="line.521"></a> <FONT color="green">522</FONT> return contractionCriteria;<a name="line.522"></a> <FONT color="green">523</FONT> }<a name="line.523"></a> <FONT color="green">524</FONT> <a name="line.524"></a> <FONT color="green">525</FONT> /**<a name="line.525"></a> <FONT color="green">526</FONT> * Returns the element at the specified index<a name="line.526"></a> <FONT color="green">527</FONT> *<a name="line.527"></a> <FONT color="green">528</FONT> * @param index index to fetch a value from<a name="line.528"></a> <FONT color="green">529</FONT> * @return value stored at the specified index<a name="line.529"></a> <FONT color="green">530</FONT> * @throws ArrayIndexOutOfBoundsException if <code>index</code> is less than<a name="line.530"></a> <FONT color="green">531</FONT> * zero or is greater than <code>getNumElements() - 1</code>.<a name="line.531"></a> <FONT color="green">532</FONT> */<a name="line.532"></a> <FONT color="green">533</FONT> public synchronized double getElement(int index) {<a name="line.533"></a> <FONT color="green">534</FONT> if (index >= numElements) {<a name="line.534"></a> <FONT color="green">535</FONT> throw MathRuntimeException.createArrayIndexOutOfBoundsException(<a name="line.535"></a> <FONT color="green">536</FONT> "the index specified: {0} is larger than the current maximal index {1}",<a name="line.536"></a> <FONT color="green">537</FONT> index, numElements - 1);<a name="line.537"></a> <FONT color="green">538</FONT> } else if (index >= 0) {<a name="line.538"></a> <FONT color="green">539</FONT> return internalArray[startIndex + index];<a name="line.539"></a> <FONT color="green">540</FONT> } else {<a name="line.540"></a> <FONT color="green">541</FONT> throw MathRuntimeException.createArrayIndexOutOfBoundsException(<a name="line.541"></a> <FONT color="green">542</FONT> "elements cannot be retrieved from a negative array index {0}",<a name="line.542"></a> <FONT color="green">543</FONT> index);<a name="line.543"></a> <FONT color="green">544</FONT> }<a name="line.544"></a> <FONT color="green">545</FONT> }<a name="line.545"></a> <FONT color="green">546</FONT> <a name="line.546"></a> <FONT color="green">547</FONT> /**<a name="line.547"></a> <FONT color="green">548</FONT> * Returns a double array containing the elements of this<a name="line.548"></a> <FONT color="green">549</FONT> * <code>ResizableArray</code>. This method returns a copy, not a<a name="line.549"></a> <FONT color="green">550</FONT> * reference to the underlying array, so that changes made to the returned<a name="line.550"></a> <FONT color="green">551</FONT> * array have no effect on this <code>ResizableArray.</code><a name="line.551"></a> <FONT color="green">552</FONT> * @return the double array.<a name="line.552"></a> <FONT color="green">553</FONT> */<a name="line.553"></a> <FONT color="green">554</FONT> public synchronized double[] getElements() {<a name="line.554"></a> <FONT color="green">555</FONT> double[] elementArray = new double[numElements];<a name="line.555"></a> <FONT color="green">556</FONT> System.arraycopy( internalArray, startIndex, elementArray, 0,<a name="line.556"></a> <FONT color="green">557</FONT> numElements);<a name="line.557"></a> <FONT color="green">558</FONT> return elementArray;<a name="line.558"></a> <FONT color="green">559</FONT> }<a name="line.559"></a> <FONT color="green">560</FONT> <a name="line.560"></a> <FONT color="green">561</FONT> /**<a name="line.561"></a> <FONT color="green">562</FONT> * The expansion factor controls the size of a new array when an array<a name="line.562"></a> <FONT color="green">563</FONT> * needs to be expanded. The <code>expansionMode</code><a name="line.563"></a> <FONT color="green">564</FONT> * determines whether the size of the array is multiplied by the<a name="line.564"></a> <FONT color="green">565</FONT> * <code>expansionFactor</code> (MULTIPLICATIVE_MODE) or if<a name="line.565"></a> <FONT color="green">566</FONT> * the expansion is additive (ADDITIVE_MODE -- <code>expansionFactor</code><a name="line.566"></a> <FONT color="green">567</FONT> * storage locations added). The default <code>expansionMode</code> is<a name="line.567"></a> <FONT color="green">568</FONT> * MULTIPLICATIVE_MODE and the default <code>expansionFactor</code><a name="line.568"></a> <FONT color="green">569</FONT> * is 2.0.<a name="line.569"></a> <FONT color="green">570</FONT> *<a name="line.570"></a> <FONT color="green">571</FONT> * @return the expansion factor of this expandable double array<a name="line.571"></a> <FONT color="green">572</FONT> */<a name="line.572"></a> <FONT color="green">573</FONT> public float getExpansionFactor() {<a name="line.573"></a> <FONT color="green">574</FONT> return expansionFactor;<a name="line.574"></a> <FONT color="green">575</FONT> }<a name="line.575"></a> <FONT color="green">576</FONT> <a name="line.576"></a> <FONT color="green">577</FONT> /**<a name="line.577"></a> <FONT color="green">578</FONT> * The <code>expansionMode</code> determines whether the internal storage<a name="line.578"></a> <FONT color="green">579</FONT> * array grows additively (ADDITIVE_MODE) or multiplicatively<a name="line.579"></a> <FONT color="green">580</FONT> * (MULTIPLICATIVE_MODE) when it is expanded.<a name="line.580"></a> <FONT color="green">581</FONT> *<a name="line.581"></a> <FONT color="green">582</FONT> * @return Returns the expansionMode.<a name="line.582"></a> <FONT color="green">583</FONT> */<a name="line.583"></a> <FONT color="green">584</FONT> public int getExpansionMode() {<a name="line.584"></a> <FONT color="green">585</FONT> return expansionMode;<a name="line.585"></a> <FONT color="green">586</FONT> }<a name="line.586"></a> <FONT color="green">587</FONT> <a name="line.587"></a> <FONT color="green">588</FONT> /**<a name="line.588"></a> <FONT color="green">589</FONT> * Notice the package scope on this method. This method is simply here<a name="line.589"></a> <FONT color="green">590</FONT> * for the JUnit test, it allows us check if the expansion is working<a name="line.590"></a> <FONT color="green">591</FONT> * properly after a number of expansions. This is not meant to be a part<a name="line.591"></a> <FONT color="green">592</FONT> * of the public interface of this class.<a name="line.592"></a> <FONT color="green">593</FONT> *<a name="line.593"></a> <FONT color="green">594</FONT> * @return the length of the internal storage array.<a name="line.594"></a> <FONT color="green">595</FONT> */<a name="line.595"></a> <FONT color="green">596</FONT> synchronized int getInternalLength() {<a name="line.596"></a> <FONT color="green">597</FONT> return internalArray.length;<a name="line.597"></a> <FONT color="green">598</FONT> }<a name="line.598"></a> <FONT color="green">599</FONT> <a name="line.599"></a> <FONT color="green">600</FONT> /**<a name="line.600"></a> <FONT color="green">601</FONT> * Returns the number of elements currently in the array. Please note<a name="line.601"></a> <FONT color="green">602</FONT> * that this is different from the length of the internal storage array.<a name="line.602"></a> <FONT color="green">603</FONT> *<a name="line.603"></a> <FONT color="green">604</FONT> * @return number of elements<a name="line.604"></a> <FONT color="green">605</FONT> */<a name="line.605"></a> <FONT color="green">606</FONT> public synchronized int getNumElements() {<a name="line.606"></a> <FONT color="green">607</FONT> return numElements;<a name="line.607"></a> <FONT color="green">608</FONT> }<a name="line.608"></a> <FONT color="green">609</FONT> <a name="line.609"></a> <FONT color="green">610</FONT> /**<a name="line.610"></a> <FONT color="green">611</FONT> * Returns the internal storage array. Note that this method returns<a name="line.611"></a> <FONT color="green">612</FONT> * a reference to the internal storage array, not a copy, and to correctly<a name="line.612"></a> <FONT color="green">613</FONT> * address elements of the array, the <code>startIndex</code> is<a name="line.613"></a> <FONT color="green">614</FONT> * required (available via the {@link #start} method). This method should<a name="line.614"></a> <FONT color="green">615</FONT> * only be used in cases where copying the internal array is not practical.<a name="line.615"></a> <FONT color="green">616</FONT> * The {@link #getElements} method should be used in all other cases.<a name="line.616"></a> <FONT color="green">617</FONT> *<a name="line.617"></a> <FONT color="green">618</FONT> *<a name="line.618"></a> <FONT color="green">619</FONT> * @return the internal storage array used by this object<a name="line.619"></a> <FONT color="green">620</FONT> * @deprecated replaced by {@link #getInternalValues()} as of 2.0<a name="line.620"></a> <FONT color="green">621</FONT> */<a name="line.621"></a> <FONT color="green">622</FONT> @Deprecated<a name="line.622"></a> <FONT color="green">623</FONT> public synchronized double[] getValues() {<a name="line.623"></a> <FONT color="green">624</FONT> return internalArray;<a name="line.624"></a> <FONT color="green">625</FONT> }<a name="line.625"></a> <FONT color="green">626</FONT> <a name="line.626"></a> <FONT color="green">627</FONT> /**<a name="line.627"></a> <FONT color="green">628</FONT> * Returns the internal storage array. Note that this method returns<a name="line.628"></a> <FONT color="green">629</FONT> * a reference to the internal storage array, not a copy, and to correctly<a name="line.629"></a> <FONT color="green">630</FONT> * address elements of the array, the <code>startIndex</code> is<a name="line.630"></a> <FONT color="green">631</FONT> * required (available via the {@link #start} method). This method should<a name="line.631"></a> <FONT color="green">632</FONT> * only be used in cases where copying the internal array is not practical.<a name="line.632"></a> <FONT color="green">633</FONT> * The {@link #getElements} method should be used in all other cases.<a name="line.633"></a> <FONT color="green">634</FONT> *<a name="line.634"></a> <FONT color="green">635</FONT> *<a name="line.635"></a> <FONT color="green">636</FONT> * @return the internal storage array used by this object<a name="line.636"></a> <FONT color="green">637</FONT> * @since 2.0<a name="line.637"></a> <FONT color="green">638</FONT> */<a name="line.638"></a> <FONT color="green">639</FONT> public synchronized double[] getInternalValues() {<a name="line.639"></a> <FONT color="green">640</FONT> return internalArray;<a name="line.640"></a> <FONT color="green">641</FONT> }<a name="line.641"></a> <FONT color="green">642</FONT> <a name="line.642"></a> <FONT color="green">643</FONT> /**<a name="line.643"></a> <FONT color="green">644</FONT> * Sets the contraction criteria for this ExpandContractDoubleArray.<a name="line.644"></a> <FONT color="green">645</FONT> *<a name="line.645"></a> <FONT color="green">646</FONT> * @param contractionCriteria contraction criteria<a name="line.646"></a> <FONT color="green">647</FONT> */<a name="line.647"></a> <FONT color="green">648</FONT> public void setContractionCriteria(float contractionCriteria) {<a name="line.648"></a> <FONT color="green">649</FONT> checkContractExpand(contractionCriteria, getExpansionFactor());<a name="line.649"></a> <FONT color="green">650</FONT> synchronized(this) {<a name="line.650"></a> <FONT color="green">651</FONT> this.contractionCriteria = contractionCriteria;<a name="line.651"></a> <FONT color="green">652</FONT> }<a name="line.652"></a> <FONT color="green">653</FONT> }<a name="line.653"></a> <FONT color="green">654</FONT> <a name="line.654"></a> <FONT color="green">655</FONT> <a name="line.655"></a> <FONT color="green">656</FONT> /**<a name="line.656"></a> <FONT color="green">657</FONT> * Sets the element at the specified index. If the specified index is greater than<a name="line.657"></a> <FONT color="green">658</FONT> * <code>getNumElements() - 1</code>, the <code>numElements</code> property<a name="line.658"></a> <FONT color="green">659</FONT> * is increased to <code>index +1</code> and additional storage is allocated<a name="line.659"></a> <FONT color="green">660</FONT> * (if necessary) for the new element and all (uninitialized) elements<a name="line.660"></a> <FONT color="green">661</FONT> * between the new element and the previous end of the array).<a name="line.661"></a> <FONT color="green">662</FONT> *<a name="line.662"></a> <FONT color="green">663</FONT> * @param index index to store a value in<a name="line.663"></a> <FONT color="green">664</FONT> * @param value value to store at the specified index<a name="line.664"></a> <FONT color="green">665</FONT> * @throws ArrayIndexOutOfBoundsException if <code>index</code> is less than<a name="line.665"></a> <FONT color="green">666</FONT> * zero.<a name="line.666"></a> <FONT color="green">667</FONT> */<a name="line.667"></a> <FONT color="green">668</FONT> public synchronized void setElement(int index, double value) {<a name="line.668"></a> <FONT color="green">669</FONT> if (index < 0) {<a name="line.669"></a> <FONT color="green">670</FONT> throw MathRuntimeException.createArrayIndexOutOfBoundsException(<a name="line.670"></a> <FONT color="green">671</FONT> "cannot set an element at a negative index {0}",<a name="line.671"></a> <FONT color="green">672</FONT> index);<a name="line.672"></a> <FONT color="green">673</FONT> }<a name="line.673"></a> <FONT color="green">674</FONT> if (index + 1 > numElements) {<a name="line.674"></a> <FONT color="green">675</FONT> numElements = index + 1;<a name="line.675"></a> <FONT color="green">676</FONT> }<a name="line.676"></a> <FONT color="green">677</FONT> if ((startIndex + index) >= internalArray.length) {<a name="line.677"></a> <FONT color="green">678</FONT> expandTo(startIndex + (index + 1));<a name="line.678"></a> <FONT color="green">679</FONT> }<a name="line.679"></a> <FONT color="green">680</FONT> internalArray[startIndex + index] = value;<a name="line.680"></a> <FONT color="green">681</FONT> }<a name="line.681"></a> <FONT color="green">682</FONT> <a name="line.682"></a> <FONT color="green">683</FONT> /**<a name="line.683"></a> <FONT color="green">684</FONT> * Sets the expansionFactor. Throws IllegalArgumentException if the<a name="line.684"></a> <FONT color="green">685</FONT> * the following conditions are not met:<a name="line.685"></a> <FONT color="green">686</FONT> * <ul><a name="line.686"></a> <FONT color="green">687</FONT> * <li><code>expansionFactor > 1</code></li><a name="line.687"></a> <FONT color="green">688</FONT> * <li><code>contractionFactor >= expansionFactor</code></li><a name="line.688"></a> <FONT color="green">689</FONT> * </ul><a name="line.689"></a> <FONT color="green">690</FONT> * @param expansionFactor the new expansion factor value.<a name="line.690"></a> <FONT color="green">691</FONT> * @throws IllegalArgumentException if expansionFactor is <= 1 or greater<a name="line.691"></a> <FONT color="green">692</FONT> * than contractionFactor<a name="line.692"></a> <FONT color="green">693</FONT> */<a name="line.693"></a> <FONT color="green">694</FONT> public void setExpansionFactor(float expansionFactor) {<a name="line.694"></a> <FONT color="green">695</FONT> checkContractExpand(getContractionCriteria(), expansionFactor);<a name="line.695"></a> <FONT color="green">696</FONT> // The check above verifies that the expansion factor is > 1.0;<a name="line.696"></a> <FONT color="green">697</FONT> synchronized(this) {<a name="line.697"></a> <FONT color="green">698</FONT> this.expansionFactor = expansionFactor;<a name="line.698"></a> <FONT color="green">699</FONT> }<a name="line.699"></a> <FONT color="green">700</FONT> }<a name="line.700"></a> <FONT color="green">701</FONT> <a name="line.701"></a> <FONT color="green">702</FONT> /**<a name="line.702"></a> <FONT color="green">703</FONT> * Sets the <code>expansionMode</code>. The specified value must be one of<a name="line.703"></a> <FONT color="green">704</FONT> * ADDITIVE_MODE, MULTIPLICATIVE_MODE.<a name="line.704"></a> <FONT color="green">705</FONT> *<a name="line.705"></a> <FONT color="green">706</FONT> * @param expansionMode The expansionMode to set.<a name="line.706"></a> <FONT color="green">707</FONT> * @throws IllegalArgumentException if the specified mode value is not valid<a name="line.707"></a> <FONT color="green">708</FONT> */<a name="line.708"></a> <FONT color="green">709</FONT> public void setExpansionMode(int expansionMode) {<a name="line.709"></a> <FONT color="green">710</FONT> if (expansionMode != MULTIPLICATIVE_MODE &&<a name="line.710"></a> <FONT color="green">711</FONT> expansionMode != ADDITIVE_MODE) {<a name="line.711"></a> <FONT color="green">712</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.712"></a> <FONT color="green">713</FONT> "unsupported expansion mode {0}, supported modes are {1} ({2}) and {3} ({4})",<a name="line.713"></a> <FONT color="green">714</FONT> expansionMode, MULTIPLICATIVE_MODE, "MULTIPLICATIVE_MODE",<a name="line.714"></a> <FONT color="green">715</FONT> ADDITIVE_MODE, "ADDITIVE_MODE");<a name="line.715"></a> <FONT color="green">716</FONT> }<a name="line.716"></a> <FONT color="green">717</FONT> synchronized(this) {<a name="line.717"></a> <FONT color="green">718</FONT> this.expansionMode = expansionMode;<a name="line.718"></a> <FONT color="green">719</FONT> }<a name="line.719"></a> <FONT color="green">720</FONT> }<a name="line.720"></a> <FONT color="green">721</FONT> <a name="line.721"></a> <FONT color="green">722</FONT> /**<a name="line.722"></a> <FONT color="green">723</FONT> * Sets the initial capacity. Should only be invoked by constructors.<a name="line.723"></a> <FONT color="green">724</FONT> *<a name="line.724"></a> <FONT color="green">725</FONT> * @param initialCapacity of the array<a name="line.725"></a> <FONT color="green">726</FONT> * @throws IllegalArgumentException if <code>initialCapacity</code> is not<a name="line.726"></a> <FONT color="green">727</FONT> * positive.<a name="line.727"></a> <FONT color="green">728</FONT> */<a name="line.728"></a> <FONT color="green">729</FONT> protected void setInitialCapacity(int initialCapacity) {<a name="line.729"></a> <FONT color="green">730</FONT> if (initialCapacity > 0) {<a name="line.730"></a> <FONT color="green">731</FONT> synchronized(this) {<a name="line.731"></a> <FONT color="green">732</FONT> this.initialCapacity = initialCapacity;<a name="line.732"></a> <FONT color="green">733</FONT> }<a name="line.733"></a> <FONT color="green">734</FONT> } else {<a name="line.734"></a> <FONT color="green">735</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.735"></a> <FONT color="green">736</FONT> "initial capacity ({0}) is not positive",<a name="line.736"></a> <FONT color="green">737</FONT> initialCapacity);<a name="line.737"></a> <FONT color="green">738</FONT> }<a name="line.738"></a> <FONT color="green">739</FONT> }<a name="line.739"></a> <FONT color="green">740</FONT> <a name="line.740"></a> <FONT color="green">741</FONT> /**<a name="line.741"></a> <FONT color="green">742</FONT> * This function allows you to control the number of elements contained<a name="line.742"></a> <FONT color="green">743</FONT> * in this array, and can be used to "throw out" the last n values in an<a name="line.743"></a> <FONT color="green">744</FONT> * array. This function will also expand the internal array as needed.<a name="line.744"></a> <FONT color="green">745</FONT> *<a name="line.745"></a> <FONT color="green">746</FONT> * @param i a new number of elements<a name="line.746"></a> <FONT color="green">747</FONT> * @throws IllegalArgumentException if <code>i</code> is negative.<a name="line.747"></a> <FONT color="green">748</FONT> */<a name="line.748"></a> <FONT color="green">749</FONT> public synchronized void setNumElements(int i) {<a name="line.749"></a> <FONT color="green">750</FONT> <a name="line.750"></a> <FONT color="green">751</FONT> // If index is negative thrown an error<a name="line.751"></a> <FONT color="green">752</FONT> if (i < 0) {<a name="line.752"></a> <FONT color="green">753</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.753"></a> <FONT color="green">754</FONT> "index ({0}) is not positive",<a name="line.754"></a> <FONT color="green">755</FONT> i);<a name="line.755"></a> <FONT color="green">756</FONT> }<a name="line.756"></a> <FONT color="green">757</FONT> <a name="line.757"></a> <FONT color="green">758</FONT> // Test the new num elements, check to see if the array needs to be<a name="line.758"></a> <FONT color="green">759</FONT> // expanded to accommodate this new number of elements<a name="line.759"></a> <FONT color="green">760</FONT> if ((startIndex + i) > internalArray.length) {<a name="line.760"></a> <FONT color="green">761</FONT> expandTo(startIndex + i);<a name="line.761"></a> <FONT color="green">762</FONT> }<a name="line.762"></a> <FONT color="green">763</FONT> <a name="line.763"></a> <FONT color="green">764</FONT> // Set the new number of elements to new value<a name="line.764"></a> <FONT color="green">765</FONT> numElements = i;<a name="line.765"></a> <FONT color="green">766</FONT> }<a name="line.766"></a> <FONT color="green">767</FONT> <a name="line.767"></a> <FONT color="green">768</FONT> /**<a name="line.768"></a> <FONT color="green">769</FONT> * Returns true if the internal storage array has too many unused<a name="line.769"></a> <FONT color="green">770</FONT> * storage positions.<a name="line.770"></a> <FONT color="green">771</FONT> *<a name="line.771"></a> <FONT color="green">772</FONT> * @return true if array satisfies the contraction criteria<a name="line.772"></a> <FONT color="green">773</FONT> */<a name="line.773"></a> <FONT color="green">774</FONT> private synchronized boolean shouldContract() {<a name="line.774"></a> <FONT color="green">775</FONT> if (expansionMode == MULTIPLICATIVE_MODE) {<a name="line.775"></a> <FONT color="green">776</FONT> return (internalArray.length / ((float) numElements)) > contractionCriteria;<a name="line.776"></a> <FONT color="green">777</FONT> } else {<a name="line.777"></a> <FONT color="green">778</FONT> return (internalArray.length - numElements) > contractionCriteria;<a name="line.778"></a> <FONT color="green">779</FONT> }<a name="line.779"></a> <FONT color="green">780</FONT> }<a name="line.780"></a> <FONT color="green">781</FONT> <a name="line.781"></a> <FONT color="green">782</FONT> /**<a name="line.782"></a> <FONT color="green">783</FONT> * Returns the starting index of the internal array. The starting index is<a name="line.783"></a> <FONT color="green">784</FONT> * the position of the first addressable element in the internal storage<a name="line.784"></a> <FONT color="green">785</FONT> * array. The addressable elements in the array are <code><a name="line.785"></a> <FONT color="green">786</FONT> * internalArray[startIndex],...,internalArray[startIndex + numElements -1]<a name="line.786"></a> <FONT color="green">787</FONT> * </code><a name="line.787"></a> <FONT color="green">788</FONT> *<a name="line.788"></a> <FONT color="green">789</FONT> * @return starting index<a name="line.789"></a> <FONT color="green">790</FONT> */<a name="line.790"></a> <FONT color="green">791</FONT> public synchronized int start() {<a name="line.791"></a> <FONT color="green">792</FONT> return startIndex;<a name="line.792"></a> <FONT color="green">793</FONT> }<a name="line.793"></a> <FONT color="green">794</FONT> <a name="line.794"></a> <FONT color="green">795</FONT> /**<a name="line.795"></a> <FONT color="green">796</FONT> * <p>Copies source to dest, copying the underlying data, so dest is<a name="line.796"></a> <FONT color="green">797</FONT> * a new, independent copy of source. Does not contract before<a name="line.797"></a> <FONT color="green">798</FONT> * the copy.</p><a name="line.798"></a> <FONT color="green">799</FONT> *<a name="line.799"></a> <FONT color="green">800</FONT> * <p>Obtains synchronization locks on both source and dest<a name="line.800"></a> <FONT color="green">801</FONT> * (in that order) before performing the copy.</p><a name="line.801"></a> <FONT color="green">802</FONT> *<a name="line.802"></a> <FONT color="green">803</FONT> * <p>Neither source nor dest may be null; otherwise a NullPointerException<a name="line.803"></a> <FONT color="green">804</FONT> * is thrown</p><a name="line.804"></a> <FONT color="green">805</FONT> *<a name="line.805"></a> <FONT color="green">806</FONT> * @param source ResizableDoubleArray to copy<a name="line.806"></a> <FONT color="green">807</FONT> * @param dest ResizableArray to replace with a copy of the source array<a name="line.807"></a> <FONT color="green">808</FONT> * @since 2.0<a name="line.808"></a> <FONT color="green">809</FONT> *<a name="line.809"></a> <FONT color="green">810</FONT> */<a name="line.810"></a> <FONT color="green">811</FONT> public static void copy(ResizableDoubleArray source, ResizableDoubleArray dest) {<a name="line.811"></a> <FONT color="green">812</FONT> synchronized(source) {<a name="line.812"></a> <FONT color="green">813</FONT> synchronized(dest) {<a name="line.813"></a> <FONT color="green">814</FONT> dest.initialCapacity = source.initialCapacity;<a name="line.814"></a> <FONT color="green">815</FONT> dest.contractionCriteria = source.contractionCriteria;<a name="line.815"></a> <FONT color="green">816</FONT> dest.expansionFactor = source.expansionFactor;<a name="line.816"></a> <FONT color="green">817</FONT> dest.expansionMode = source.expansionMode;<a name="line.817"></a> <FONT color="green">818</FONT> dest.internalArray = new double[source.internalArray.length];<a name="line.818"></a> <FONT color="green">819</FONT> System.arraycopy(source.internalArray, 0, dest.internalArray,<a name="line.819"></a> <FONT color="green">820</FONT> 0, dest.internalArray.length);<a name="line.820"></a> <FONT color="green">821</FONT> dest.numElements = source.numElements;<a name="line.821"></a> <FONT color="green">822</FONT> dest.startIndex = source.startIndex;<a name="line.822"></a> <FONT color="green">823</FONT> }<a name="line.823"></a> <FONT color="green">824</FONT> }<a name="line.824"></a> <FONT color="green">825</FONT> }<a name="line.825"></a> <FONT color="green">826</FONT> <a name="line.826"></a> <FONT color="green">827</FONT> /**<a name="line.827"></a> <FONT color="green">828</FONT> * Returns a copy of the ResizableDoubleArray. Does not contract before<a name="line.828"></a> <FONT color="green">829</FONT> * the copy, so the returned object is an exact copy of this.<a name="line.829"></a> <FONT color="green">830</FONT> *<a name="line.830"></a> <FONT color="green">831</FONT> * @return a new ResizableDoubleArray with the same data and configuration<a name="line.831"></a> <FONT color="green">832</FONT> * properties as this<a name="line.832"></a> <FONT color="green">833</FONT> * @since 2.0<a name="line.833"></a> <FONT color="green">834</FONT> */<a name="line.834"></a> <FONT color="green">835</FONT> public synchronized ResizableDoubleArray copy() {<a name="line.835"></a> <FONT color="green">836</FONT> ResizableDoubleArray result = new ResizableDoubleArray();<a name="line.836"></a> <FONT color="green">837</FONT> copy(this, result);<a name="line.837"></a> <FONT color="green">838</FONT> return result;<a name="line.838"></a> <FONT color="green">839</FONT> }<a name="line.839"></a> <FONT color="green">840</FONT> <a name="line.840"></a> <FONT color="green">841</FONT> /**<a name="line.841"></a> <FONT color="green">842</FONT> * Returns true iff object is a ResizableDoubleArray with the same properties<a name="line.842"></a> <FONT color="green">843</FONT> * as this and an identical internal storage array.<a name="line.843"></a> <FONT color="green">844</FONT> *<a name="line.844"></a> <FONT color="green">845</FONT> * @param object object to be compared for equality with this<a name="line.845"></a> <FONT color="green">846</FONT> * @return true iff object is a ResizableDoubleArray with the same data and<a name="line.846"></a> <FONT color="green">847</FONT> * properties as this<a name="line.847"></a> <FONT color="green">848</FONT> * @since 2.0<a name="line.848"></a> <FONT color="green">849</FONT> */<a name="line.849"></a> <FONT color="green">850</FONT> @Override<a name="line.850"></a> <FONT color="green">851</FONT> public boolean equals(Object object) {<a name="line.851"></a> <FONT color="green">852</FONT> if (object == this ) {<a name="line.852"></a> <FONT color="green">853</FONT> return true;<a name="line.853"></a> <FONT color="green">854</FONT> }<a name="line.854"></a> <FONT color="green">855</FONT> if (object instanceof ResizableDoubleArray == false) {<a name="line.855"></a> <FONT color="green">856</FONT> return false;<a name="line.856"></a> <FONT color="green">857</FONT> }<a name="line.857"></a> <FONT color="green">858</FONT> synchronized(this) {<a name="line.858"></a> <FONT color="green">859</FONT> synchronized(object) {<a name="line.859"></a> <FONT color="green">860</FONT> boolean result = true;<a name="line.860"></a> <FONT color="green">861</FONT> ResizableDoubleArray other = (ResizableDoubleArray) object;<a name="line.861"></a> <FONT color="green">862</FONT> result = result && (other.initialCapacity == initialCapacity);<a name="line.862"></a> <FONT color="green">863</FONT> result = result && (other.contractionCriteria == contractionCriteria);<a name="line.863"></a> <FONT color="green">864</FONT> result = result && (other.expansionFactor == expansionFactor);<a name="line.864"></a> <FONT color="green">865</FONT> result = result && (other.expansionMode == expansionMode);<a name="line.865"></a> <FONT color="green">866</FONT> result = result && (other.numElements == numElements);<a name="line.866"></a> <FONT color="green">867</FONT> result = result && (other.startIndex == startIndex);<a name="line.867"></a> <FONT color="green">868</FONT> if (!result) {<a name="line.868"></a> <FONT color="green">869</FONT> return false;<a name="line.869"></a> <FONT color="green">870</FONT> } else {<a name="line.870"></a> <FONT color="green">871</FONT> return Arrays.equals(internalArray, other.internalArray);<a name="line.871"></a> <FONT color="green">872</FONT> }<a name="line.872"></a> <FONT color="green">873</FONT> }<a name="line.873"></a> <FONT color="green">874</FONT> }<a name="line.874"></a> <FONT color="green">875</FONT> }<a name="line.875"></a> <FONT color="green">876</FONT> <a name="line.876"></a> <FONT color="green">877</FONT> /**<a name="line.877"></a> <FONT color="green">878</FONT> * Returns a hash code consistent with equals.<a name="line.878"></a> <FONT color="green">879</FONT> *<a name="line.879"></a> <FONT color="green">880</FONT> * @return hash code representing this ResizableDoubleArray<a name="line.880"></a> <FONT color="green">881</FONT> * @since 2.0<a name="line.881"></a> <FONT color="green">882</FONT> */<a name="line.882"></a> <FONT color="green">883</FONT> @Override<a name="line.883"></a> <FONT color="green">884</FONT> public synchronized int hashCode() {<a name="line.884"></a> <FONT color="green">885</FONT> int[] hashData = new int[7];<a name="line.885"></a> <FONT color="green">886</FONT> hashData[0] = new Float(expansionFactor).hashCode();<a name="line.886"></a> <FONT color="green">887</FONT> hashData[1] = new Float(contractionCriteria).hashCode();<a name="line.887"></a> <FONT color="green">888</FONT> hashData[2] = expansionMode;<a name="line.888"></a> <FONT color="green">889</FONT> hashData[3] = Arrays.hashCode(internalArray);<a name="line.889"></a> <FONT color="green">890</FONT> hashData[4] = initialCapacity;<a name="line.890"></a> <FONT color="green">891</FONT> hashData[5] = numElements;<a name="line.891"></a> <FONT color="green">892</FONT> hashData[6] = startIndex;<a name="line.892"></a> <FONT color="green">893</FONT> return Arrays.hashCode(hashData);<a name="line.893"></a> <FONT color="green">894</FONT> }<a name="line.894"></a> <FONT color="green">895</FONT> <a name="line.895"></a> <FONT color="green">896</FONT> }<a name="line.896"></a> </PRE> </BODY> </HTML>