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view libs/commons-math-2.1/docs/apidocs/src-html/org/apache/commons/math/complex/ComplexFormat.html @ 13:cbf34dd4d7e6
commons-math-2.1 added
| 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> <a name="line.17"></a> <FONT color="green">018</FONT> package org.apache.commons.math.complex;<a name="line.18"></a> <FONT color="green">019</FONT> <a name="line.19"></a> <FONT color="green">020</FONT> import java.text.FieldPosition;<a name="line.20"></a> <FONT color="green">021</FONT> import java.text.NumberFormat;<a name="line.21"></a> <FONT color="green">022</FONT> import java.text.ParseException;<a name="line.22"></a> <FONT color="green">023</FONT> import java.text.ParsePosition;<a name="line.23"></a> <FONT color="green">024</FONT> import java.util.Locale;<a name="line.24"></a> <FONT color="green">025</FONT> <a name="line.25"></a> <FONT color="green">026</FONT> import org.apache.commons.math.MathRuntimeException;<a name="line.26"></a> <FONT color="green">027</FONT> import org.apache.commons.math.util.CompositeFormat;<a name="line.27"></a> <FONT color="green">028</FONT> <a name="line.28"></a> <FONT color="green">029</FONT> /**<a name="line.29"></a> <FONT color="green">030</FONT> * Formats a Complex number in cartesian format "Re(c) + Im(c)i". 'i' can<a name="line.30"></a> <FONT color="green">031</FONT> * be replaced with 'j' (or anything else), and the number format for both real<a name="line.31"></a> <FONT color="green">032</FONT> * and imaginary parts can be configured.<a name="line.32"></a> <FONT color="green">033</FONT> *<a name="line.33"></a> <FONT color="green">034</FONT> * @version $Revision: 811783 $ $Date: 2009-09-06 04:56:58 -0400 (Sun, 06 Sep 2009) $<a name="line.34"></a> <FONT color="green">035</FONT> */<a name="line.35"></a> <FONT color="green">036</FONT> public class ComplexFormat extends CompositeFormat {<a name="line.36"></a> <FONT color="green">037</FONT> <a name="line.37"></a> <FONT color="green">038</FONT> /** Serializable version identifier */<a name="line.38"></a> <FONT color="green">039</FONT> private static final long serialVersionUID = -3343698360149467646L;<a name="line.39"></a> <FONT color="green">040</FONT> <a name="line.40"></a> <FONT color="green">041</FONT> /** The default imaginary character. */<a name="line.41"></a> <FONT color="green">042</FONT> private static final String DEFAULT_IMAGINARY_CHARACTER = "i";<a name="line.42"></a> <FONT color="green">043</FONT> <a name="line.43"></a> <FONT color="green">044</FONT> /** The notation used to signify the imaginary part of the complex number. */<a name="line.44"></a> <FONT color="green">045</FONT> private String imaginaryCharacter;<a name="line.45"></a> <FONT color="green">046</FONT> <a name="line.46"></a> <FONT color="green">047</FONT> /** The format used for the imaginary part. */<a name="line.47"></a> <FONT color="green">048</FONT> private NumberFormat imaginaryFormat;<a name="line.48"></a> <FONT color="green">049</FONT> <a name="line.49"></a> <FONT color="green">050</FONT> /** The format used for the real part. */<a name="line.50"></a> <FONT color="green">051</FONT> private NumberFormat realFormat;<a name="line.51"></a> <FONT color="green">052</FONT> <a name="line.52"></a> <FONT color="green">053</FONT> /**<a name="line.53"></a> <FONT color="green">054</FONT> * Create an instance with the default imaginary character, 'i', and the<a name="line.54"></a> <FONT color="green">055</FONT> * default number format for both real and imaginary parts.<a name="line.55"></a> <FONT color="green">056</FONT> */<a name="line.56"></a> <FONT color="green">057</FONT> public ComplexFormat() {<a name="line.57"></a> <FONT color="green">058</FONT> this(DEFAULT_IMAGINARY_CHARACTER, getDefaultNumberFormat());<a name="line.58"></a> <FONT color="green">059</FONT> }<a name="line.59"></a> <FONT color="green">060</FONT> <a name="line.60"></a> <FONT color="green">061</FONT> /**<a name="line.61"></a> <FONT color="green">062</FONT> * Create an instance with a custom number format for both real and<a name="line.62"></a> <FONT color="green">063</FONT> * imaginary parts.<a name="line.63"></a> <FONT color="green">064</FONT> * @param format the custom format for both real and imaginary parts.<a name="line.64"></a> <FONT color="green">065</FONT> */<a name="line.65"></a> <FONT color="green">066</FONT> public ComplexFormat(NumberFormat format) {<a name="line.66"></a> <FONT color="green">067</FONT> this(DEFAULT_IMAGINARY_CHARACTER, format);<a name="line.67"></a> <FONT color="green">068</FONT> }<a name="line.68"></a> <FONT color="green">069</FONT> <a name="line.69"></a> <FONT color="green">070</FONT> /**<a name="line.70"></a> <FONT color="green">071</FONT> * Create an instance with a custom number format for the real part and a<a name="line.71"></a> <FONT color="green">072</FONT> * custom number format for the imaginary part.<a name="line.72"></a> <FONT color="green">073</FONT> * @param realFormat the custom format for the real part.<a name="line.73"></a> <FONT color="green">074</FONT> * @param imaginaryFormat the custom format for the imaginary part.<a name="line.74"></a> <FONT color="green">075</FONT> */<a name="line.75"></a> <FONT color="green">076</FONT> public ComplexFormat(NumberFormat realFormat, NumberFormat imaginaryFormat) {<a name="line.76"></a> <FONT color="green">077</FONT> this(DEFAULT_IMAGINARY_CHARACTER, realFormat, imaginaryFormat);<a name="line.77"></a> <FONT color="green">078</FONT> }<a name="line.78"></a> <FONT color="green">079</FONT> <a name="line.79"></a> <FONT color="green">080</FONT> /**<a name="line.80"></a> <FONT color="green">081</FONT> * Create an instance with a custom imaginary character, and the default<a name="line.81"></a> <FONT color="green">082</FONT> * number format for both real and imaginary parts.<a name="line.82"></a> <FONT color="green">083</FONT> * @param imaginaryCharacter The custom imaginary character.<a name="line.83"></a> <FONT color="green">084</FONT> */<a name="line.84"></a> <FONT color="green">085</FONT> public ComplexFormat(String imaginaryCharacter) {<a name="line.85"></a> <FONT color="green">086</FONT> this(imaginaryCharacter, getDefaultNumberFormat());<a name="line.86"></a> <FONT color="green">087</FONT> }<a name="line.87"></a> <FONT color="green">088</FONT> <a name="line.88"></a> <FONT color="green">089</FONT> /**<a name="line.89"></a> <FONT color="green">090</FONT> * Create an instance with a custom imaginary character, and a custom number<a name="line.90"></a> <FONT color="green">091</FONT> * format for both real and imaginary parts.<a name="line.91"></a> <FONT color="green">092</FONT> * @param imaginaryCharacter The custom imaginary character.<a name="line.92"></a> <FONT color="green">093</FONT> * @param format the custom format for both real and imaginary parts.<a name="line.93"></a> <FONT color="green">094</FONT> */<a name="line.94"></a> <FONT color="green">095</FONT> public ComplexFormat(String imaginaryCharacter, NumberFormat format) {<a name="line.95"></a> <FONT color="green">096</FONT> this(imaginaryCharacter, format, (NumberFormat)format.clone());<a name="line.96"></a> <FONT color="green">097</FONT> }<a name="line.97"></a> <FONT color="green">098</FONT> <a name="line.98"></a> <FONT color="green">099</FONT> /**<a name="line.99"></a> <FONT color="green">100</FONT> * Create an instance with a custom imaginary character, a custom number<a name="line.100"></a> <FONT color="green">101</FONT> * format for the real part, and a custom number format for the imaginary<a name="line.101"></a> <FONT color="green">102</FONT> * part.<a name="line.102"></a> <FONT color="green">103</FONT> * @param imaginaryCharacter The custom imaginary character.<a name="line.103"></a> <FONT color="green">104</FONT> * @param realFormat the custom format for the real part.<a name="line.104"></a> <FONT color="green">105</FONT> * @param imaginaryFormat the custom format for the imaginary part.<a name="line.105"></a> <FONT color="green">106</FONT> */<a name="line.106"></a> <FONT color="green">107</FONT> public ComplexFormat(String imaginaryCharacter, NumberFormat realFormat,<a name="line.107"></a> <FONT color="green">108</FONT> NumberFormat imaginaryFormat) {<a name="line.108"></a> <FONT color="green">109</FONT> super();<a name="line.109"></a> <FONT color="green">110</FONT> setImaginaryCharacter(imaginaryCharacter);<a name="line.110"></a> <FONT color="green">111</FONT> setImaginaryFormat(imaginaryFormat);<a name="line.111"></a> <FONT color="green">112</FONT> setRealFormat(realFormat);<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> /**<a name="line.115"></a> <FONT color="green">116</FONT> * Get the set of locales for which complex formats are available.<a name="line.116"></a> <FONT color="green">117</FONT> * <p>This is the same set as the {@link NumberFormat} set.</p><a name="line.117"></a> <FONT color="green">118</FONT> * @return available complex format locales.<a name="line.118"></a> <FONT color="green">119</FONT> */<a name="line.119"></a> <FONT color="green">120</FONT> public static Locale[] getAvailableLocales() {<a name="line.120"></a> <FONT color="green">121</FONT> return NumberFormat.getAvailableLocales();<a name="line.121"></a> <FONT color="green">122</FONT> }<a name="line.122"></a> <FONT color="green">123</FONT> <a name="line.123"></a> <FONT color="green">124</FONT> /**<a name="line.124"></a> <FONT color="green">125</FONT> * This static method calls {@link #format(Object)} on a default instance of<a name="line.125"></a> <FONT color="green">126</FONT> * ComplexFormat.<a name="line.126"></a> <FONT color="green">127</FONT> *<a name="line.127"></a> <FONT color="green">128</FONT> * @param c Complex object to format<a name="line.128"></a> <FONT color="green">129</FONT> * @return A formatted number in the form "Re(c) + Im(c)i"<a name="line.129"></a> <FONT color="green">130</FONT> */<a name="line.130"></a> <FONT color="green">131</FONT> public static String formatComplex(Complex c) {<a name="line.131"></a> <FONT color="green">132</FONT> return getInstance().format(c);<a name="line.132"></a> <FONT color="green">133</FONT> }<a name="line.133"></a> <FONT color="green">134</FONT> <a name="line.134"></a> <FONT color="green">135</FONT> /**<a name="line.135"></a> <FONT color="green">136</FONT> * Formats a {@link Complex} object to produce a string.<a name="line.136"></a> <FONT color="green">137</FONT> *<a name="line.137"></a> <FONT color="green">138</FONT> * @param complex the object to format.<a name="line.138"></a> <FONT color="green">139</FONT> * @param toAppendTo where the text is to be appended<a name="line.139"></a> <FONT color="green">140</FONT> * @param pos On input: an alignment field, if desired. On output: the<a name="line.140"></a> <FONT color="green">141</FONT> * offsets of the alignment field<a name="line.141"></a> <FONT color="green">142</FONT> * @return the value passed in as toAppendTo.<a name="line.142"></a> <FONT color="green">143</FONT> */<a name="line.143"></a> <FONT color="green">144</FONT> public StringBuffer format(Complex complex, StringBuffer toAppendTo,<a name="line.144"></a> <FONT color="green">145</FONT> FieldPosition pos) {<a name="line.145"></a> <FONT color="green">146</FONT> <a name="line.146"></a> <FONT color="green">147</FONT> pos.setBeginIndex(0);<a name="line.147"></a> <FONT color="green">148</FONT> pos.setEndIndex(0);<a name="line.148"></a> <FONT color="green">149</FONT> <a name="line.149"></a> <FONT color="green">150</FONT> // format real<a name="line.150"></a> <FONT color="green">151</FONT> double re = complex.getReal();<a name="line.151"></a> <FONT color="green">152</FONT> formatDouble(re, getRealFormat(), toAppendTo, pos);<a name="line.152"></a> <FONT color="green">153</FONT> <a name="line.153"></a> <FONT color="green">154</FONT> // format sign and imaginary<a name="line.154"></a> <FONT color="green">155</FONT> double im = complex.getImaginary();<a name="line.155"></a> <FONT color="green">156</FONT> if (im < 0.0) {<a name="line.156"></a> <FONT color="green">157</FONT> toAppendTo.append(" - ");<a name="line.157"></a> <FONT color="green">158</FONT> formatDouble(-im, getImaginaryFormat(), toAppendTo, pos);<a name="line.158"></a> <FONT color="green">159</FONT> toAppendTo.append(getImaginaryCharacter());<a name="line.159"></a> <FONT color="green">160</FONT> } else if (im > 0.0 || Double.isNaN(im)) {<a name="line.160"></a> <FONT color="green">161</FONT> toAppendTo.append(" + ");<a name="line.161"></a> <FONT color="green">162</FONT> formatDouble(im, getImaginaryFormat(), toAppendTo, pos);<a name="line.162"></a> <FONT color="green">163</FONT> toAppendTo.append(getImaginaryCharacter());<a name="line.163"></a> <FONT color="green">164</FONT> }<a name="line.164"></a> <FONT color="green">165</FONT> <a name="line.165"></a> <FONT color="green">166</FONT> return toAppendTo;<a name="line.166"></a> <FONT color="green">167</FONT> }<a name="line.167"></a> <FONT color="green">168</FONT> <a name="line.168"></a> <FONT color="green">169</FONT> /**<a name="line.169"></a> <FONT color="green">170</FONT> * Formats a object to produce a string. <code>obj</code> must be either a<a name="line.170"></a> <FONT color="green">171</FONT> * {@link Complex} object or a {@link Number} object. Any other type of<a name="line.171"></a> <FONT color="green">172</FONT> * object will result in an {@link IllegalArgumentException} being thrown.<a name="line.172"></a> <FONT color="green">173</FONT> *<a name="line.173"></a> <FONT color="green">174</FONT> * @param obj the object to format.<a name="line.174"></a> <FONT color="green">175</FONT> * @param toAppendTo where the text is to be appended<a name="line.175"></a> <FONT color="green">176</FONT> * @param pos On input: an alignment field, if desired. On output: the<a name="line.176"></a> <FONT color="green">177</FONT> * offsets of the alignment field<a name="line.177"></a> <FONT color="green">178</FONT> * @return the value passed in as toAppendTo.<a name="line.178"></a> <FONT color="green">179</FONT> * @see java.text.Format#format(java.lang.Object, java.lang.StringBuffer, java.text.FieldPosition)<a name="line.179"></a> <FONT color="green">180</FONT> * @throws IllegalArgumentException is <code>obj</code> is not a valid type.<a name="line.180"></a> <FONT color="green">181</FONT> */<a name="line.181"></a> <FONT color="green">182</FONT> @Override<a name="line.182"></a> <FONT color="green">183</FONT> public StringBuffer format(Object obj, StringBuffer toAppendTo,<a name="line.183"></a> <FONT color="green">184</FONT> FieldPosition pos) {<a name="line.184"></a> <FONT color="green">185</FONT> <a name="line.185"></a> <FONT color="green">186</FONT> StringBuffer ret = null;<a name="line.186"></a> <FONT color="green">187</FONT> <a name="line.187"></a> <FONT color="green">188</FONT> if (obj instanceof Complex) {<a name="line.188"></a> <FONT color="green">189</FONT> ret = format( (Complex)obj, toAppendTo, pos);<a name="line.189"></a> <FONT color="green">190</FONT> } else if (obj instanceof Number) {<a name="line.190"></a> <FONT color="green">191</FONT> ret = format( new Complex(((Number)obj).doubleValue(), 0.0),<a name="line.191"></a> <FONT color="green">192</FONT> toAppendTo, pos);<a name="line.192"></a> <FONT color="green">193</FONT> } else {<a name="line.193"></a> <FONT color="green">194</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.194"></a> <FONT color="green">195</FONT> "cannot format a {0} instance as a complex number",<a name="line.195"></a> <FONT color="green">196</FONT> obj.getClass().getName());<a name="line.196"></a> <FONT color="green">197</FONT> }<a name="line.197"></a> <FONT color="green">198</FONT> <a name="line.198"></a> <FONT color="green">199</FONT> return ret;<a name="line.199"></a> <FONT color="green">200</FONT> }<a name="line.200"></a> <FONT color="green">201</FONT> <a name="line.201"></a> <FONT color="green">202</FONT> /**<a name="line.202"></a> <FONT color="green">203</FONT> * Access the imaginaryCharacter.<a name="line.203"></a> <FONT color="green">204</FONT> * @return the imaginaryCharacter.<a name="line.204"></a> <FONT color="green">205</FONT> */<a name="line.205"></a> <FONT color="green">206</FONT> public String getImaginaryCharacter() {<a name="line.206"></a> <FONT color="green">207</FONT> return imaginaryCharacter;<a name="line.207"></a> <FONT color="green">208</FONT> }<a name="line.208"></a> <FONT color="green">209</FONT> <a name="line.209"></a> <FONT color="green">210</FONT> /**<a name="line.210"></a> <FONT color="green">211</FONT> * Access the imaginaryFormat.<a name="line.211"></a> <FONT color="green">212</FONT> * @return the imaginaryFormat.<a name="line.212"></a> <FONT color="green">213</FONT> */<a name="line.213"></a> <FONT color="green">214</FONT> public NumberFormat getImaginaryFormat() {<a name="line.214"></a> <FONT color="green">215</FONT> return imaginaryFormat;<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> * Returns the default complex format for the current locale.<a name="line.219"></a> <FONT color="green">220</FONT> * @return the default complex format.<a name="line.220"></a> <FONT color="green">221</FONT> */<a name="line.221"></a> <FONT color="green">222</FONT> public static ComplexFormat getInstance() {<a name="line.222"></a> <FONT color="green">223</FONT> return getInstance(Locale.getDefault());<a name="line.223"></a> <FONT color="green">224</FONT> }<a name="line.224"></a> <FONT color="green">225</FONT> <a name="line.225"></a> <FONT color="green">226</FONT> /**<a name="line.226"></a> <FONT color="green">227</FONT> * Returns the default complex format for the given locale.<a name="line.227"></a> <FONT color="green">228</FONT> * @param locale the specific locale used by the format.<a name="line.228"></a> <FONT color="green">229</FONT> * @return the complex format specific to the given locale.<a name="line.229"></a> <FONT color="green">230</FONT> */<a name="line.230"></a> <FONT color="green">231</FONT> public static ComplexFormat getInstance(Locale locale) {<a name="line.231"></a> <FONT color="green">232</FONT> NumberFormat f = getDefaultNumberFormat(locale);<a name="line.232"></a> <FONT color="green">233</FONT> return new ComplexFormat(f);<a name="line.233"></a> <FONT color="green">234</FONT> }<a name="line.234"></a> <FONT color="green">235</FONT> <a name="line.235"></a> <FONT color="green">236</FONT> /**<a name="line.236"></a> <FONT color="green">237</FONT> * Access the realFormat.<a name="line.237"></a> <FONT color="green">238</FONT> * @return the realFormat.<a name="line.238"></a> <FONT color="green">239</FONT> */<a name="line.239"></a> <FONT color="green">240</FONT> public NumberFormat getRealFormat() {<a name="line.240"></a> <FONT color="green">241</FONT> return realFormat;<a name="line.241"></a> <FONT color="green">242</FONT> }<a name="line.242"></a> <FONT color="green">243</FONT> <a name="line.243"></a> <FONT color="green">244</FONT> /**<a name="line.244"></a> <FONT color="green">245</FONT> * Parses a string to produce a {@link Complex} object.<a name="line.245"></a> <FONT color="green">246</FONT> *<a name="line.246"></a> <FONT color="green">247</FONT> * @param source the string to parse<a name="line.247"></a> <FONT color="green">248</FONT> * @return the parsed {@link Complex} object.<a name="line.248"></a> <FONT color="green">249</FONT> * @exception ParseException if the beginning of the specified string<a name="line.249"></a> <FONT color="green">250</FONT> * cannot be parsed.<a name="line.250"></a> <FONT color="green">251</FONT> */<a name="line.251"></a> <FONT color="green">252</FONT> public Complex parse(String source) throws ParseException {<a name="line.252"></a> <FONT color="green">253</FONT> ParsePosition parsePosition = new ParsePosition(0);<a name="line.253"></a> <FONT color="green">254</FONT> Complex result = parse(source, parsePosition);<a name="line.254"></a> <FONT color="green">255</FONT> if (parsePosition.getIndex() == 0) {<a name="line.255"></a> <FONT color="green">256</FONT> throw MathRuntimeException.createParseException(<a name="line.256"></a> <FONT color="green">257</FONT> parsePosition.getErrorIndex(),<a name="line.257"></a> <FONT color="green">258</FONT> "unparseable complex number: \"{0}\"", source);<a name="line.258"></a> <FONT color="green">259</FONT> }<a name="line.259"></a> <FONT color="green">260</FONT> return result;<a name="line.260"></a> <FONT color="green">261</FONT> }<a name="line.261"></a> <FONT color="green">262</FONT> <a name="line.262"></a> <FONT color="green">263</FONT> /**<a name="line.263"></a> <FONT color="green">264</FONT> * Parses a string to produce a {@link Complex} object.<a name="line.264"></a> <FONT color="green">265</FONT> *<a name="line.265"></a> <FONT color="green">266</FONT> * @param source the string to parse<a name="line.266"></a> <FONT color="green">267</FONT> * @param pos input/ouput parsing parameter.<a name="line.267"></a> <FONT color="green">268</FONT> * @return the parsed {@link Complex} object.<a name="line.268"></a> <FONT color="green">269</FONT> */<a name="line.269"></a> <FONT color="green">270</FONT> public Complex parse(String source, ParsePosition pos) {<a name="line.270"></a> <FONT color="green">271</FONT> int initialIndex = pos.getIndex();<a name="line.271"></a> <FONT color="green">272</FONT> <a name="line.272"></a> <FONT color="green">273</FONT> // parse whitespace<a name="line.273"></a> <FONT color="green">274</FONT> parseAndIgnoreWhitespace(source, pos);<a name="line.274"></a> <FONT color="green">275</FONT> <a name="line.275"></a> <FONT color="green">276</FONT> // parse real<a name="line.276"></a> <FONT color="green">277</FONT> Number re = parseNumber(source, getRealFormat(), pos);<a name="line.277"></a> <FONT color="green">278</FONT> if (re == null) {<a name="line.278"></a> <FONT color="green">279</FONT> // invalid real number<a name="line.279"></a> <FONT color="green">280</FONT> // set index back to initial, error index should already be set<a name="line.280"></a> <FONT color="green">281</FONT> pos.setIndex(initialIndex);<a name="line.281"></a> <FONT color="green">282</FONT> return null;<a name="line.282"></a> <FONT color="green">283</FONT> }<a name="line.283"></a> <FONT color="green">284</FONT> <a name="line.284"></a> <FONT color="green">285</FONT> // parse sign<a name="line.285"></a> <FONT color="green">286</FONT> int startIndex = pos.getIndex();<a name="line.286"></a> <FONT color="green">287</FONT> char c = parseNextCharacter(source, pos);<a name="line.287"></a> <FONT color="green">288</FONT> int sign = 0;<a name="line.288"></a> <FONT color="green">289</FONT> switch (c) {<a name="line.289"></a> <FONT color="green">290</FONT> case 0 :<a name="line.290"></a> <FONT color="green">291</FONT> // no sign<a name="line.291"></a> <FONT color="green">292</FONT> // return real only complex number<a name="line.292"></a> <FONT color="green">293</FONT> return new Complex(re.doubleValue(), 0.0);<a name="line.293"></a> <FONT color="green">294</FONT> case '-' :<a name="line.294"></a> <FONT color="green">295</FONT> sign = -1;<a name="line.295"></a> <FONT color="green">296</FONT> break;<a name="line.296"></a> <FONT color="green">297</FONT> case '+' :<a name="line.297"></a> <FONT color="green">298</FONT> sign = 1;<a name="line.298"></a> <FONT color="green">299</FONT> break;<a name="line.299"></a> <FONT color="green">300</FONT> default :<a name="line.300"></a> <FONT color="green">301</FONT> // invalid sign<a name="line.301"></a> <FONT color="green">302</FONT> // set index back to initial, error index should be the last<a name="line.302"></a> <FONT color="green">303</FONT> // character examined.<a name="line.303"></a> <FONT color="green">304</FONT> pos.setIndex(initialIndex);<a name="line.304"></a> <FONT color="green">305</FONT> pos.setErrorIndex(startIndex);<a name="line.305"></a> <FONT color="green">306</FONT> return null;<a name="line.306"></a> <FONT color="green">307</FONT> }<a name="line.307"></a> <FONT color="green">308</FONT> <a name="line.308"></a> <FONT color="green">309</FONT> // parse whitespace<a name="line.309"></a> <FONT color="green">310</FONT> parseAndIgnoreWhitespace(source, pos);<a name="line.310"></a> <FONT color="green">311</FONT> <a name="line.311"></a> <FONT color="green">312</FONT> // parse imaginary<a name="line.312"></a> <FONT color="green">313</FONT> Number im = parseNumber(source, getRealFormat(), pos);<a name="line.313"></a> <FONT color="green">314</FONT> if (im == null) {<a name="line.314"></a> <FONT color="green">315</FONT> // invalid imaginary number<a name="line.315"></a> <FONT color="green">316</FONT> // set index back to initial, error index should already be set<a name="line.316"></a> <FONT color="green">317</FONT> pos.setIndex(initialIndex);<a name="line.317"></a> <FONT color="green">318</FONT> return null;<a name="line.318"></a> <FONT color="green">319</FONT> }<a name="line.319"></a> <FONT color="green">320</FONT> <a name="line.320"></a> <FONT color="green">321</FONT> // parse imaginary character<a name="line.321"></a> <FONT color="green">322</FONT> if (!parseFixedstring(source, getImaginaryCharacter(), pos)) {<a name="line.322"></a> <FONT color="green">323</FONT> return null;<a name="line.323"></a> <FONT color="green">324</FONT> }<a name="line.324"></a> <FONT color="green">325</FONT> <a name="line.325"></a> <FONT color="green">326</FONT> return new Complex(re.doubleValue(), im.doubleValue() * sign);<a name="line.326"></a> <FONT color="green">327</FONT> <a name="line.327"></a> <FONT color="green">328</FONT> }<a name="line.328"></a> <FONT color="green">329</FONT> <a name="line.329"></a> <FONT color="green">330</FONT> /**<a name="line.330"></a> <FONT color="green">331</FONT> * Parses a string to produce a object.<a name="line.331"></a> <FONT color="green">332</FONT> *<a name="line.332"></a> <FONT color="green">333</FONT> * @param source the string to parse<a name="line.333"></a> <FONT color="green">334</FONT> * @param pos input/ouput parsing parameter.<a name="line.334"></a> <FONT color="green">335</FONT> * @return the parsed object.<a name="line.335"></a> <FONT color="green">336</FONT> * @see java.text.Format#parseObject(java.lang.String, java.text.ParsePosition)<a name="line.336"></a> <FONT color="green">337</FONT> */<a name="line.337"></a> <FONT color="green">338</FONT> @Override<a name="line.338"></a> <FONT color="green">339</FONT> public Object parseObject(String source, ParsePosition pos) {<a name="line.339"></a> <FONT color="green">340</FONT> return parse(source, pos);<a name="line.340"></a> <FONT color="green">341</FONT> }<a name="line.341"></a> <FONT color="green">342</FONT> <a name="line.342"></a> <FONT color="green">343</FONT> /**<a name="line.343"></a> <FONT color="green">344</FONT> * Modify the imaginaryCharacter.<a name="line.344"></a> <FONT color="green">345</FONT> * @param imaginaryCharacter The new imaginaryCharacter value.<a name="line.345"></a> <FONT color="green">346</FONT> * @throws IllegalArgumentException if <code>imaginaryCharacter</code> is<a name="line.346"></a> <FONT color="green">347</FONT> * <code>null</code> or an empty string.<a name="line.347"></a> <FONT color="green">348</FONT> */<a name="line.348"></a> <FONT color="green">349</FONT> public void setImaginaryCharacter(String imaginaryCharacter) {<a name="line.349"></a> <FONT color="green">350</FONT> if (imaginaryCharacter == null || imaginaryCharacter.length() == 0) {<a name="line.350"></a> <FONT color="green">351</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.351"></a> <FONT color="green">352</FONT> "empty string for imaginary character");<a name="line.352"></a> <FONT color="green">353</FONT> }<a name="line.353"></a> <FONT color="green">354</FONT> this.imaginaryCharacter = imaginaryCharacter;<a name="line.354"></a> <FONT color="green">355</FONT> }<a name="line.355"></a> <FONT color="green">356</FONT> <a name="line.356"></a> <FONT color="green">357</FONT> /**<a name="line.357"></a> <FONT color="green">358</FONT> * Modify the imaginaryFormat.<a name="line.358"></a> <FONT color="green">359</FONT> * @param imaginaryFormat The new imaginaryFormat value.<a name="line.359"></a> <FONT color="green">360</FONT> * @throws IllegalArgumentException if <code>imaginaryFormat</code> is<a name="line.360"></a> <FONT color="green">361</FONT> * <code>null</code>.<a name="line.361"></a> <FONT color="green">362</FONT> */<a name="line.362"></a> <FONT color="green">363</FONT> public void setImaginaryFormat(NumberFormat imaginaryFormat) {<a name="line.363"></a> <FONT color="green">364</FONT> if (imaginaryFormat == null) {<a name="line.364"></a> <FONT color="green">365</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.365"></a> <FONT color="green">366</FONT> "null imaginary format");<a name="line.366"></a> <FONT color="green">367</FONT> }<a name="line.367"></a> <FONT color="green">368</FONT> this.imaginaryFormat = imaginaryFormat;<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> /**<a name="line.371"></a> <FONT color="green">372</FONT> * Modify the realFormat.<a name="line.372"></a> <FONT color="green">373</FONT> * @param realFormat The new realFormat value.<a name="line.373"></a> <FONT color="green">374</FONT> * @throws IllegalArgumentException if <code>realFormat</code> is<a name="line.374"></a> <FONT color="green">375</FONT> * <code>null</code>.<a name="line.375"></a> <FONT color="green">376</FONT> */<a name="line.376"></a> <FONT color="green">377</FONT> public void setRealFormat(NumberFormat realFormat) {<a name="line.377"></a> <FONT color="green">378</FONT> if (realFormat == null) {<a name="line.378"></a> <FONT color="green">379</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.379"></a> <FONT color="green">380</FONT> "null real format");<a name="line.380"></a> <FONT color="green">381</FONT> }<a name="line.381"></a> <FONT color="green">382</FONT> this.realFormat = realFormat;<a name="line.382"></a> <FONT color="green">383</FONT> }<a name="line.383"></a> <FONT color="green">384</FONT> <a name="line.384"></a> <FONT color="green">385</FONT> }<a name="line.385"></a> </PRE> </BODY> </HTML>