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view libs/commons-math-2.1/docs/apidocs/src-html/org/apache/commons/math/fraction/FractionFormat.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.fraction;<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.ConvergenceException;<a name="line.26"></a> <FONT color="green">027</FONT> import org.apache.commons.math.MathRuntimeException;<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 Fraction number in proper format or improper format. The number<a name="line.30"></a> <FONT color="green">031</FONT> * format for each of the whole number, numerator and, denominator can be<a name="line.31"></a> <FONT color="green">032</FONT> * configured.<a name="line.32"></a> <FONT color="green">033</FONT> *<a name="line.33"></a> <FONT color="green">034</FONT> * @since 1.1<a name="line.34"></a> <FONT color="green">035</FONT> * @version $Revision: 811685 $ $Date: 2009-09-05 13:36:48 -0400 (Sat, 05 Sep 2009) $<a name="line.35"></a> <FONT color="green">036</FONT> */<a name="line.36"></a> <FONT color="green">037</FONT> public class FractionFormat extends AbstractFormat {<a name="line.37"></a> <FONT color="green">038</FONT> <a name="line.38"></a> <FONT color="green">039</FONT> /** Serializable version identifier */<a name="line.39"></a> <FONT color="green">040</FONT> private static final long serialVersionUID = 3008655719530972611L;<a name="line.40"></a> <FONT color="green">041</FONT> <a name="line.41"></a> <FONT color="green">042</FONT> /**<a name="line.42"></a> <FONT color="green">043</FONT> * Create an improper formatting instance with the default number format<a name="line.43"></a> <FONT color="green">044</FONT> * for the numerator and denominator.<a name="line.44"></a> <FONT color="green">045</FONT> */<a name="line.45"></a> <FONT color="green">046</FONT> public FractionFormat() {<a name="line.46"></a> <FONT color="green">047</FONT> }<a name="line.47"></a> <FONT color="green">048</FONT> <a name="line.48"></a> <FONT color="green">049</FONT> /**<a name="line.49"></a> <FONT color="green">050</FONT> * Create an improper formatting instance with a custom number format for<a name="line.50"></a> <FONT color="green">051</FONT> * both the numerator and denominator.<a name="line.51"></a> <FONT color="green">052</FONT> * @param format the custom format for both the numerator and denominator.<a name="line.52"></a> <FONT color="green">053</FONT> */<a name="line.53"></a> <FONT color="green">054</FONT> public FractionFormat(final NumberFormat format) {<a name="line.54"></a> <FONT color="green">055</FONT> super(format);<a name="line.55"></a> <FONT color="green">056</FONT> }<a name="line.56"></a> <FONT color="green">057</FONT> <a name="line.57"></a> <FONT color="green">058</FONT> /**<a name="line.58"></a> <FONT color="green">059</FONT> * Create an improper formatting instance with a custom number format for<a name="line.59"></a> <FONT color="green">060</FONT> * the numerator and a custom number format for the denominator.<a name="line.60"></a> <FONT color="green">061</FONT> * @param numeratorFormat the custom format for the numerator.<a name="line.61"></a> <FONT color="green">062</FONT> * @param denominatorFormat the custom format for the denominator.<a name="line.62"></a> <FONT color="green">063</FONT> */<a name="line.63"></a> <FONT color="green">064</FONT> public FractionFormat(final NumberFormat numeratorFormat,<a name="line.64"></a> <FONT color="green">065</FONT> final NumberFormat denominatorFormat) {<a name="line.65"></a> <FONT color="green">066</FONT> super(numeratorFormat, denominatorFormat);<a name="line.66"></a> <FONT color="green">067</FONT> }<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> * Get the set of locales for which complex formats are available. This<a name="line.70"></a> <FONT color="green">071</FONT> * is the same set as the {@link NumberFormat} set.<a name="line.71"></a> <FONT color="green">072</FONT> * @return available complex format locales.<a name="line.72"></a> <FONT color="green">073</FONT> */<a name="line.73"></a> <FONT color="green">074</FONT> public static Locale[] getAvailableLocales() {<a name="line.74"></a> <FONT color="green">075</FONT> return NumberFormat.getAvailableLocales();<a name="line.75"></a> <FONT color="green">076</FONT> }<a name="line.76"></a> <FONT color="green">077</FONT> <a name="line.77"></a> <FONT color="green">078</FONT> /**<a name="line.78"></a> <FONT color="green">079</FONT> * This static method calls formatFraction() on a default instance of<a name="line.79"></a> <FONT color="green">080</FONT> * FractionFormat.<a name="line.80"></a> <FONT color="green">081</FONT> *<a name="line.81"></a> <FONT color="green">082</FONT> * @param f Fraction object to format<a name="line.82"></a> <FONT color="green">083</FONT> * @return A formatted fraction in proper form.<a name="line.83"></a> <FONT color="green">084</FONT> */<a name="line.84"></a> <FONT color="green">085</FONT> public static String formatFraction(Fraction f) {<a name="line.85"></a> <FONT color="green">086</FONT> return getImproperInstance().format(f);<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> * Returns the default complex format for the current locale.<a name="line.90"></a> <FONT color="green">091</FONT> * @return the default complex format.<a name="line.91"></a> <FONT color="green">092</FONT> */<a name="line.92"></a> <FONT color="green">093</FONT> public static FractionFormat getImproperInstance() {<a name="line.93"></a> <FONT color="green">094</FONT> return getImproperInstance(Locale.getDefault());<a name="line.94"></a> <FONT color="green">095</FONT> }<a name="line.95"></a> <FONT color="green">096</FONT> <a name="line.96"></a> <FONT color="green">097</FONT> /**<a name="line.97"></a> <FONT color="green">098</FONT> * Returns the default complex format for the given locale.<a name="line.98"></a> <FONT color="green">099</FONT> * @param locale the specific locale used by the format.<a name="line.99"></a> <FONT color="green">100</FONT> * @return the complex format specific to the given locale.<a name="line.100"></a> <FONT color="green">101</FONT> */<a name="line.101"></a> <FONT color="green">102</FONT> public static FractionFormat getImproperInstance(final Locale locale) {<a name="line.102"></a> <FONT color="green">103</FONT> return new FractionFormat(getDefaultNumberFormat(locale));<a name="line.103"></a> <FONT color="green">104</FONT> }<a name="line.104"></a> <FONT color="green">105</FONT> <a name="line.105"></a> <FONT color="green">106</FONT> /**<a name="line.106"></a> <FONT color="green">107</FONT> * Returns the default complex format for the current locale.<a name="line.107"></a> <FONT color="green">108</FONT> * @return the default complex format.<a name="line.108"></a> <FONT color="green">109</FONT> */<a name="line.109"></a> <FONT color="green">110</FONT> public static FractionFormat getProperInstance() {<a name="line.110"></a> <FONT color="green">111</FONT> return getProperInstance(Locale.getDefault());<a name="line.111"></a> <FONT color="green">112</FONT> }<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> * Returns the default complex format for the given locale.<a name="line.115"></a> <FONT color="green">116</FONT> * @param locale the specific locale used by the format.<a name="line.116"></a> <FONT color="green">117</FONT> * @return the complex format specific to the given locale.<a name="line.117"></a> <FONT color="green">118</FONT> */<a name="line.118"></a> <FONT color="green">119</FONT> public static FractionFormat getProperInstance(final Locale locale) {<a name="line.119"></a> <FONT color="green">120</FONT> return new ProperFractionFormat(getDefaultNumberFormat(locale));<a name="line.120"></a> <FONT color="green">121</FONT> }<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> * Create a default number format. The default number format is based on<a name="line.124"></a> <FONT color="green">125</FONT> * {@link NumberFormat#getNumberInstance(java.util.Locale)} with the only<a name="line.125"></a> <FONT color="green">126</FONT> * customizing is the maximum number of fraction digits, which is set to 0.<a name="line.126"></a> <FONT color="green">127</FONT> * @return the default number format.<a name="line.127"></a> <FONT color="green">128</FONT> */<a name="line.128"></a> <FONT color="green">129</FONT> protected static NumberFormat getDefaultNumberFormat() {<a name="line.129"></a> <FONT color="green">130</FONT> return getDefaultNumberFormat(Locale.getDefault());<a name="line.130"></a> <FONT color="green">131</FONT> }<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> * Formats a {@link Fraction} object to produce a string. The fraction is<a name="line.134"></a> <FONT color="green">135</FONT> * output in improper format.<a name="line.135"></a> <FONT color="green">136</FONT> *<a name="line.136"></a> <FONT color="green">137</FONT> * @param fraction the object to format.<a name="line.137"></a> <FONT color="green">138</FONT> * @param toAppendTo where the text is to be appended<a name="line.138"></a> <FONT color="green">139</FONT> * @param pos On input: an alignment field, if desired. On output: the<a name="line.139"></a> <FONT color="green">140</FONT> * offsets of the alignment field<a name="line.140"></a> <FONT color="green">141</FONT> * @return the value passed in as toAppendTo.<a name="line.141"></a> <FONT color="green">142</FONT> */<a name="line.142"></a> <FONT color="green">143</FONT> public StringBuffer format(final Fraction fraction,<a name="line.143"></a> <FONT color="green">144</FONT> final StringBuffer toAppendTo, final FieldPosition pos) {<a name="line.144"></a> <FONT color="green">145</FONT> <a name="line.145"></a> <FONT color="green">146</FONT> pos.setBeginIndex(0);<a name="line.146"></a> <FONT color="green">147</FONT> pos.setEndIndex(0);<a name="line.147"></a> <FONT color="green">148</FONT> <a name="line.148"></a> <FONT color="green">149</FONT> getNumeratorFormat().format(fraction.getNumerator(), toAppendTo, pos);<a name="line.149"></a> <FONT color="green">150</FONT> toAppendTo.append(" / ");<a name="line.150"></a> <FONT color="green">151</FONT> getDenominatorFormat().format(fraction.getDenominator(), toAppendTo,<a name="line.151"></a> <FONT color="green">152</FONT> pos);<a name="line.152"></a> <FONT color="green">153</FONT> <a name="line.153"></a> <FONT color="green">154</FONT> return toAppendTo;<a name="line.154"></a> <FONT color="green">155</FONT> }<a name="line.155"></a> <FONT color="green">156</FONT> <a name="line.156"></a> <FONT color="green">157</FONT> /**<a name="line.157"></a> <FONT color="green">158</FONT> * Formats an object and appends the result to a StringBuffer. <code>obj</code> must be either a<a name="line.158"></a> <FONT color="green">159</FONT> * {@link Fraction} object or a {@link Number} object. Any other type of<a name="line.159"></a> <FONT color="green">160</FONT> * object will result in an {@link IllegalArgumentException} being thrown.<a name="line.160"></a> <FONT color="green">161</FONT> *<a name="line.161"></a> <FONT color="green">162</FONT> * @param obj the object to format.<a name="line.162"></a> <FONT color="green">163</FONT> * @param toAppendTo where the text is to be appended<a name="line.163"></a> <FONT color="green">164</FONT> * @param pos On input: an alignment field, if desired. On output: the<a name="line.164"></a> <FONT color="green">165</FONT> * offsets of the alignment field<a name="line.165"></a> <FONT color="green">166</FONT> * @return the value passed in as toAppendTo.<a name="line.166"></a> <FONT color="green">167</FONT> * @see java.text.Format#format(java.lang.Object, java.lang.StringBuffer, java.text.FieldPosition)<a name="line.167"></a> <FONT color="green">168</FONT> * @throws IllegalArgumentException is <code>obj</code> is not a valid type.<a name="line.168"></a> <FONT color="green">169</FONT> */<a name="line.169"></a> <FONT color="green">170</FONT> @Override<a name="line.170"></a> <FONT color="green">171</FONT> public StringBuffer format(final Object obj,<a name="line.171"></a> <FONT color="green">172</FONT> final StringBuffer toAppendTo, final FieldPosition pos) {<a name="line.172"></a> <FONT color="green">173</FONT> StringBuffer ret = null;<a name="line.173"></a> <FONT color="green">174</FONT> <a name="line.174"></a> <FONT color="green">175</FONT> if (obj instanceof Fraction) {<a name="line.175"></a> <FONT color="green">176</FONT> ret = format((Fraction) obj, toAppendTo, pos);<a name="line.176"></a> <FONT color="green">177</FONT> } else if (obj instanceof Number) {<a name="line.177"></a> <FONT color="green">178</FONT> try {<a name="line.178"></a> <FONT color="green">179</FONT> ret = format(new Fraction(((Number) obj).doubleValue()),<a name="line.179"></a> <FONT color="green">180</FONT> toAppendTo, pos);<a name="line.180"></a> <FONT color="green">181</FONT> } catch (ConvergenceException ex) {<a name="line.181"></a> <FONT color="green">182</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.182"></a> <FONT color="green">183</FONT> "cannot convert given object to a fraction number: {0}",<a name="line.183"></a> <FONT color="green">184</FONT> ex.getLocalizedMessage());<a name="line.184"></a> <FONT color="green">185</FONT> }<a name="line.185"></a> <FONT color="green">186</FONT> } else {<a name="line.186"></a> <FONT color="green">187</FONT> throw MathRuntimeException.createIllegalArgumentException(<a name="line.187"></a> <FONT color="green">188</FONT> "cannot format given object as a fraction number");<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> return ret;<a name="line.191"></a> <FONT color="green">192</FONT> }<a name="line.192"></a> <FONT color="green">193</FONT> <a name="line.193"></a> <FONT color="green">194</FONT> /**<a name="line.194"></a> <FONT color="green">195</FONT> * Parses a string to produce a {@link Fraction} object.<a name="line.195"></a> <FONT color="green">196</FONT> * @param source the string to parse<a name="line.196"></a> <FONT color="green">197</FONT> * @return the parsed {@link Fraction} object.<a name="line.197"></a> <FONT color="green">198</FONT> * @exception ParseException if the beginning of the specified string<a name="line.198"></a> <FONT color="green">199</FONT> * cannot be parsed.<a name="line.199"></a> <FONT color="green">200</FONT> */<a name="line.200"></a> <FONT color="green">201</FONT> @Override<a name="line.201"></a> <FONT color="green">202</FONT> public Fraction parse(final String source) throws ParseException {<a name="line.202"></a> <FONT color="green">203</FONT> final ParsePosition parsePosition = new ParsePosition(0);<a name="line.203"></a> <FONT color="green">204</FONT> final Fraction result = parse(source, parsePosition);<a name="line.204"></a> <FONT color="green">205</FONT> if (parsePosition.getIndex() == 0) {<a name="line.205"></a> <FONT color="green">206</FONT> throw MathRuntimeException.createParseException(<a name="line.206"></a> <FONT color="green">207</FONT> parsePosition.getErrorIndex(),<a name="line.207"></a> <FONT color="green">208</FONT> "unparseable fraction number: \"{0}\"", source);<a name="line.208"></a> <FONT color="green">209</FONT> }<a name="line.209"></a> <FONT color="green">210</FONT> return result;<a name="line.210"></a> <FONT color="green">211</FONT> }<a name="line.211"></a> <FONT color="green">212</FONT> <a name="line.212"></a> <FONT color="green">213</FONT> /**<a name="line.213"></a> <FONT color="green">214</FONT> * Parses a string to produce a {@link Fraction} object. This method<a name="line.214"></a> <FONT color="green">215</FONT> * expects the string to be formatted as an improper fraction.<a name="line.215"></a> <FONT color="green">216</FONT> * @param source the string to parse<a name="line.216"></a> <FONT color="green">217</FONT> * @param pos input/ouput parsing parameter.<a name="line.217"></a> <FONT color="green">218</FONT> * @return the parsed {@link Fraction} object.<a name="line.218"></a> <FONT color="green">219</FONT> */<a name="line.219"></a> <FONT color="green">220</FONT> @Override<a name="line.220"></a> <FONT color="green">221</FONT> public Fraction parse(final String source, final ParsePosition pos) {<a name="line.221"></a> <FONT color="green">222</FONT> final int initialIndex = pos.getIndex();<a name="line.222"></a> <FONT color="green">223</FONT> <a name="line.223"></a> <FONT color="green">224</FONT> // parse whitespace<a name="line.224"></a> <FONT color="green">225</FONT> parseAndIgnoreWhitespace(source, pos);<a name="line.225"></a> <FONT color="green">226</FONT> <a name="line.226"></a> <FONT color="green">227</FONT> // parse numerator<a name="line.227"></a> <FONT color="green">228</FONT> final Number num = getNumeratorFormat().parse(source, pos);<a name="line.228"></a> <FONT color="green">229</FONT> if (num == null) {<a name="line.229"></a> <FONT color="green">230</FONT> // invalid integer number<a name="line.230"></a> <FONT color="green">231</FONT> // set index back to initial, error index should already be set<a name="line.231"></a> <FONT color="green">232</FONT> // character examined.<a name="line.232"></a> <FONT color="green">233</FONT> pos.setIndex(initialIndex);<a name="line.233"></a> <FONT color="green">234</FONT> return null;<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> // parse '/'<a name="line.237"></a> <FONT color="green">238</FONT> final int startIndex = pos.getIndex();<a name="line.238"></a> <FONT color="green">239</FONT> final char c = parseNextCharacter(source, pos);<a name="line.239"></a> <FONT color="green">240</FONT> switch (c) {<a name="line.240"></a> <FONT color="green">241</FONT> case 0 :<a name="line.241"></a> <FONT color="green">242</FONT> // no '/'<a name="line.242"></a> <FONT color="green">243</FONT> // return num as a fraction<a name="line.243"></a> <FONT color="green">244</FONT> return new Fraction(num.intValue(), 1);<a name="line.244"></a> <FONT color="green">245</FONT> case '/' :<a name="line.245"></a> <FONT color="green">246</FONT> // found '/', continue parsing denominator<a name="line.246"></a> <FONT color="green">247</FONT> break;<a name="line.247"></a> <FONT color="green">248</FONT> default :<a name="line.248"></a> <FONT color="green">249</FONT> // invalid '/'<a name="line.249"></a> <FONT color="green">250</FONT> // set index back to initial, error index should be the last<a name="line.250"></a> <FONT color="green">251</FONT> // character examined.<a name="line.251"></a> <FONT color="green">252</FONT> pos.setIndex(initialIndex);<a name="line.252"></a> <FONT color="green">253</FONT> pos.setErrorIndex(startIndex);<a name="line.253"></a> <FONT color="green">254</FONT> return null;<a name="line.254"></a> <FONT color="green">255</FONT> }<a name="line.255"></a> <FONT color="green">256</FONT> <a name="line.256"></a> <FONT color="green">257</FONT> // parse whitespace<a name="line.257"></a> <FONT color="green">258</FONT> parseAndIgnoreWhitespace(source, pos);<a name="line.258"></a> <FONT color="green">259</FONT> <a name="line.259"></a> <FONT color="green">260</FONT> // parse denominator<a name="line.260"></a> <FONT color="green">261</FONT> final Number den = getDenominatorFormat().parse(source, pos);<a name="line.261"></a> <FONT color="green">262</FONT> if (den == null) {<a name="line.262"></a> <FONT color="green">263</FONT> // invalid integer number<a name="line.263"></a> <FONT color="green">264</FONT> // set index back to initial, error index should already be set<a name="line.264"></a> <FONT color="green">265</FONT> // character examined.<a name="line.265"></a> <FONT color="green">266</FONT> pos.setIndex(initialIndex);<a name="line.266"></a> <FONT color="green">267</FONT> return null;<a name="line.267"></a> <FONT color="green">268</FONT> }<a name="line.268"></a> <FONT color="green">269</FONT> <a name="line.269"></a> <FONT color="green">270</FONT> return new Fraction(num.intValue(), den.intValue());<a name="line.270"></a> <FONT color="green">271</FONT> }<a name="line.271"></a> <FONT color="green">272</FONT> <a name="line.272"></a> <FONT color="green">273</FONT> }<a name="line.273"></a> </PRE> </BODY> </HTML>