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view libs/commons-math-2.1/docs/apidocs/src-html/org/apache/commons/math/ode/sampling/DummyStepHandler.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.ode.sampling;<a name="line.18"></a> <FONT color="green">019</FONT> <a name="line.19"></a> <FONT color="green">020</FONT> /**<a name="line.20"></a> <FONT color="green">021</FONT> * This class is a step handler that does nothing.<a name="line.21"></a> <FONT color="green">022</FONT> <a name="line.22"></a> <FONT color="green">023</FONT> * <p>This class is provided as a convenience for users who are only<a name="line.23"></a> <FONT color="green">024</FONT> * interested in the final state of an integration and not in the<a name="line.24"></a> <FONT color="green">025</FONT> * intermediate steps. Its handleStep method does nothing.</p><a name="line.25"></a> <FONT color="green">026</FONT> *<a name="line.26"></a> <FONT color="green">027</FONT> * <p>Since this class has no internal state, it is implemented using<a name="line.27"></a> <FONT color="green">028</FONT> * the Singleton design pattern. This means that only one instance is<a name="line.28"></a> <FONT color="green">029</FONT> * ever created, which can be retrieved using the getInstance<a name="line.29"></a> <FONT color="green">030</FONT> * method. This explains why there is no public constructor.</p><a name="line.30"></a> <FONT color="green">031</FONT> *<a name="line.31"></a> <FONT color="green">032</FONT> * @see StepHandler<a name="line.32"></a> <FONT color="green">033</FONT> * @version $Revision: 811827 $ $Date: 2009-09-06 11:32:50 -0400 (Sun, 06 Sep 2009) $<a name="line.33"></a> <FONT color="green">034</FONT> * @since 1.2<a name="line.34"></a> <FONT color="green">035</FONT> */<a name="line.35"></a> <FONT color="green">036</FONT> <a name="line.36"></a> <FONT color="green">037</FONT> public class DummyStepHandler implements StepHandler {<a name="line.37"></a> <FONT color="green">038</FONT> <a name="line.38"></a> <FONT color="green">039</FONT> /** Private constructor.<a name="line.39"></a> <FONT color="green">040</FONT> * The constructor is private to prevent users from creating<a name="line.40"></a> <FONT color="green">041</FONT> * instances (Singleton design-pattern).<a name="line.41"></a> <FONT color="green">042</FONT> */<a name="line.42"></a> <FONT color="green">043</FONT> private DummyStepHandler() {<a name="line.43"></a> <FONT color="green">044</FONT> }<a name="line.44"></a> <FONT color="green">045</FONT> <a name="line.45"></a> <FONT color="green">046</FONT> /** Get the only instance.<a name="line.46"></a> <FONT color="green">047</FONT> * @return the only instance<a name="line.47"></a> <FONT color="green">048</FONT> */<a name="line.48"></a> <FONT color="green">049</FONT> public static DummyStepHandler getInstance() {<a name="line.49"></a> <FONT color="green">050</FONT> return LazyHolder.INSTANCE;<a name="line.50"></a> <FONT color="green">051</FONT> }<a name="line.51"></a> <FONT color="green">052</FONT> <a name="line.52"></a> <FONT color="green">053</FONT> /** Determines whether this handler needs dense output.<a name="line.53"></a> <FONT color="green">054</FONT> * Since this handler does nothing, it does not require dense output.<a name="line.54"></a> <FONT color="green">055</FONT> * @return always false<a name="line.55"></a> <FONT color="green">056</FONT> */<a name="line.56"></a> <FONT color="green">057</FONT> public boolean requiresDenseOutput() {<a name="line.57"></a> <FONT color="green">058</FONT> return false;<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> /** Reset the step handler.<a name="line.61"></a> <FONT color="green">062</FONT> * Initialize the internal data as required before the first step is<a name="line.62"></a> <FONT color="green">063</FONT> * handled.<a name="line.63"></a> <FONT color="green">064</FONT> */<a name="line.64"></a> <FONT color="green">065</FONT> public void reset() {<a name="line.65"></a> <FONT color="green">066</FONT> }<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> * Handle the last accepted step.<a name="line.69"></a> <FONT color="green">070</FONT> * This method does nothing in this class.<a name="line.70"></a> <FONT color="green">071</FONT> * @param interpolator interpolator for the last accepted step. For<a name="line.71"></a> <FONT color="green">072</FONT> * efficiency purposes, the various integrators reuse the same<a name="line.72"></a> <FONT color="green">073</FONT> * object on each call, so if the instance wants to keep it across<a name="line.73"></a> <FONT color="green">074</FONT> * all calls (for example to provide at the end of the integration a<a name="line.74"></a> <FONT color="green">075</FONT> * continuous model valid throughout the integration range), it<a name="line.75"></a> <FONT color="green">076</FONT> * should build a local copy using the clone method and store this<a name="line.76"></a> <FONT color="green">077</FONT> * copy.<a name="line.77"></a> <FONT color="green">078</FONT> * @param isLast true if the step is the last one<a name="line.78"></a> <FONT color="green">079</FONT> */<a name="line.79"></a> <FONT color="green">080</FONT> public void handleStep(final StepInterpolator interpolator, final boolean isLast) {<a name="line.80"></a> <FONT color="green">081</FONT> }<a name="line.81"></a> <FONT color="green">082</FONT> <a name="line.82"></a> <FONT color="green">083</FONT> // CHECKSTYLE: stop HideUtilityClassConstructor<a name="line.83"></a> <FONT color="green">084</FONT> /** Holder for the instance.<a name="line.84"></a> <FONT color="green">085</FONT> * <p>We use here the Initialization On Demand Holder Idiom.</p><a name="line.85"></a> <FONT color="green">086</FONT> */<a name="line.86"></a> <FONT color="green">087</FONT> private static class LazyHolder {<a name="line.87"></a> <FONT color="green">088</FONT> /** Cached field instance. */<a name="line.88"></a> <FONT color="green">089</FONT> private static final DummyStepHandler INSTANCE = new DummyStepHandler();<a name="line.89"></a> <FONT color="green">090</FONT> }<a name="line.90"></a> <FONT color="green">091</FONT> // CHECKSTYLE: resume HideUtilityClassConstructor<a name="line.91"></a> <FONT color="green">092</FONT> <a name="line.92"></a> <FONT color="green">093</FONT> /** Handle deserialization of the singleton.<a name="line.93"></a> <FONT color="green">094</FONT> * @return the singleton instance<a name="line.94"></a> <FONT color="green">095</FONT> */<a name="line.95"></a> <FONT color="green">096</FONT> private Object readResolve() {<a name="line.96"></a> <FONT color="green">097</FONT> // return the singleton instance<a name="line.97"></a> <FONT color="green">098</FONT> return LazyHolder.INSTANCE;<a name="line.98"></a> <FONT color="green">099</FONT> }<a name="line.99"></a> <FONT color="green">100</FONT> <a name="line.100"></a> <FONT color="green">101</FONT> }<a name="line.101"></a> </PRE> </BODY> </HTML>