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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.optimization.linear;<a name="line.18"></a> <FONT color="green">019</FONT> <a name="line.19"></a> <FONT color="green">020</FONT> import java.util.Collection;<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.MaxIterationsExceededException;<a name="line.22"></a> <FONT color="green">023</FONT> import org.apache.commons.math.optimization.GoalType;<a name="line.23"></a> <FONT color="green">024</FONT> import org.apache.commons.math.optimization.OptimizationException;<a name="line.24"></a> <FONT color="green">025</FONT> import org.apache.commons.math.optimization.RealPointValuePair;<a name="line.25"></a> <FONT color="green">026</FONT> <a name="line.26"></a> <FONT color="green">027</FONT> /**<a name="line.27"></a> <FONT color="green">028</FONT> * Base class for implementing linear optimizers.<a name="line.28"></a> <FONT color="green">029</FONT> * <p>This base class handles the boilerplate methods associated to thresholds<a name="line.29"></a> <FONT color="green">030</FONT> * settings and iterations counters.</p><a name="line.30"></a> <FONT color="green">031</FONT> * @version $Revision: 925812 $ $Date: 2010-03-21 11:49:31 -0400 (Sun, 21 Mar 2010) $<a name="line.31"></a> <FONT color="green">032</FONT> * @since 2.0<a name="line.32"></a> <FONT color="green">033</FONT> *<a name="line.33"></a> <FONT color="green">034</FONT> */<a name="line.34"></a> <FONT color="green">035</FONT> public abstract class AbstractLinearOptimizer implements LinearOptimizer {<a name="line.35"></a> <FONT color="green">036</FONT> <a name="line.36"></a> <FONT color="green">037</FONT> /** Default maximal number of iterations allowed. */<a name="line.37"></a> <FONT color="green">038</FONT> public static final int DEFAULT_MAX_ITERATIONS = 100;<a name="line.38"></a> <FONT color="green">039</FONT> <a name="line.39"></a> <FONT color="green">040</FONT> /**<a name="line.40"></a> <FONT color="green">041</FONT> * Linear objective function.<a name="line.41"></a> <FONT color="green">042</FONT> * @since 2.1<a name="line.42"></a> <FONT color="green">043</FONT> */<a name="line.43"></a> <FONT color="green">044</FONT> protected LinearObjectiveFunction function;<a name="line.44"></a> <FONT color="green">045</FONT> <a name="line.45"></a> <FONT color="green">046</FONT> /**<a name="line.46"></a> <FONT color="green">047</FONT> * Linear constraints.<a name="line.47"></a> <FONT color="green">048</FONT> * @since 2.1<a name="line.48"></a> <FONT color="green">049</FONT> */<a name="line.49"></a> <FONT color="green">050</FONT> protected Collection<LinearConstraint> linearConstraints;<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> * Type of optimization goal: either {@link GoalType#MAXIMIZE} or {@link GoalType#MINIMIZE}.<a name="line.53"></a> <FONT color="green">054</FONT> * @since 2.1<a name="line.54"></a> <FONT color="green">055</FONT> */<a name="line.55"></a> <FONT color="green">056</FONT> protected GoalType goal;<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> * Whether to restrict the variables to non-negative values.<a name="line.59"></a> <FONT color="green">060</FONT> * @since 2.1<a name="line.60"></a> <FONT color="green">061</FONT> */<a name="line.61"></a> <FONT color="green">062</FONT> protected boolean nonNegative;<a name="line.62"></a> <FONT color="green">063</FONT> <a name="line.63"></a> <FONT color="green">064</FONT> /** Maximal number of iterations allowed. */<a name="line.64"></a> <FONT color="green">065</FONT> private int maxIterations;<a name="line.65"></a> <FONT color="green">066</FONT> <a name="line.66"></a> <FONT color="green">067</FONT> /** Number of iterations already performed. */<a name="line.67"></a> <FONT color="green">068</FONT> private int iterations;<a name="line.68"></a> <FONT color="green">069</FONT> <a name="line.69"></a> <FONT color="green">070</FONT> /** Simple constructor with default settings.<a name="line.70"></a> <FONT color="green">071</FONT> * <p>The maximal number of evaluation is set to its default value.</p><a name="line.71"></a> <FONT color="green">072</FONT> */<a name="line.72"></a> <FONT color="green">073</FONT> protected AbstractLinearOptimizer() {<a name="line.73"></a> <FONT color="green">074</FONT> setMaxIterations(DEFAULT_MAX_ITERATIONS);<a name="line.74"></a> <FONT color="green">075</FONT> }<a name="line.75"></a> <FONT color="green">076</FONT> <a name="line.76"></a> <FONT color="green">077</FONT> /** {@inheritDoc} */<a name="line.77"></a> <FONT color="green">078</FONT> public void setMaxIterations(int maxIterations) {<a name="line.78"></a> <FONT color="green">079</FONT> this.maxIterations = maxIterations;<a name="line.79"></a> <FONT color="green">080</FONT> }<a name="line.80"></a> <FONT color="green">081</FONT> <a name="line.81"></a> <FONT color="green">082</FONT> /** {@inheritDoc} */<a name="line.82"></a> <FONT color="green">083</FONT> public int getMaxIterations() {<a name="line.83"></a> <FONT color="green">084</FONT> return maxIterations;<a name="line.84"></a> <FONT color="green">085</FONT> }<a name="line.85"></a> <FONT color="green">086</FONT> <a name="line.86"></a> <FONT color="green">087</FONT> /** {@inheritDoc} */<a name="line.87"></a> <FONT color="green">088</FONT> public int getIterations() {<a name="line.88"></a> <FONT color="green">089</FONT> return iterations;<a name="line.89"></a> <FONT color="green">090</FONT> }<a name="line.90"></a> <FONT color="green">091</FONT> <a name="line.91"></a> <FONT color="green">092</FONT> /** Increment the iterations counter by 1.<a name="line.92"></a> <FONT color="green">093</FONT> * @exception OptimizationException if the maximal number<a name="line.93"></a> <FONT color="green">094</FONT> * of iterations is exceeded<a name="line.94"></a> <FONT color="green">095</FONT> */<a name="line.95"></a> <FONT color="green">096</FONT> protected void incrementIterationsCounter()<a name="line.96"></a> <FONT color="green">097</FONT> throws OptimizationException {<a name="line.97"></a> <FONT color="green">098</FONT> if (++iterations > maxIterations) {<a name="line.98"></a> <FONT color="green">099</FONT> throw new OptimizationException(new MaxIterationsExceededException(maxIterations));<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> <FONT color="green">102</FONT> <a name="line.102"></a> <FONT color="green">103</FONT> /** {@inheritDoc} */<a name="line.103"></a> <FONT color="green">104</FONT> public RealPointValuePair optimize(final LinearObjectiveFunction f,<a name="line.104"></a> <FONT color="green">105</FONT> final Collection<LinearConstraint> constraints,<a name="line.105"></a> <FONT color="green">106</FONT> final GoalType goalType, final boolean restrictToNonNegative)<a name="line.106"></a> <FONT color="green">107</FONT> throws OptimizationException {<a name="line.107"></a> <FONT color="green">108</FONT> <a name="line.108"></a> <FONT color="green">109</FONT> // store linear problem characteristics<a name="line.109"></a> <FONT color="green">110</FONT> this.function = f;<a name="line.110"></a> <FONT color="green">111</FONT> this.linearConstraints = constraints;<a name="line.111"></a> <FONT color="green">112</FONT> this.goal = goalType;<a name="line.112"></a> <FONT color="green">113</FONT> this.nonNegative = restrictToNonNegative;<a name="line.113"></a> <FONT color="green">114</FONT> <a name="line.114"></a> <FONT color="green">115</FONT> iterations = 0;<a name="line.115"></a> <FONT color="green">116</FONT> <a name="line.116"></a> <FONT color="green">117</FONT> // solve the problem<a name="line.117"></a> <FONT color="green">118</FONT> return doOptimize();<a name="line.118"></a> <FONT color="green">119</FONT> <a name="line.119"></a> <FONT color="green">120</FONT> }<a name="line.120"></a> <FONT color="green">121</FONT> <a name="line.121"></a> <FONT color="green">122</FONT> /** Perform the bulk of optimization algorithm.<a name="line.122"></a> <FONT color="green">123</FONT> * @return the point/value pair giving the optimal value for objective function<a name="line.123"></a> <FONT color="green">124</FONT> * @exception OptimizationException if no solution fulfilling the constraints<a name="line.124"></a> <FONT color="green">125</FONT> * can be found in the allowed number of iterations<a name="line.125"></a> <FONT color="green">126</FONT> */<a name="line.126"></a> <FONT color="green">127</FONT> protected abstract RealPointValuePair doOptimize()<a name="line.127"></a> <FONT color="green">128</FONT> throws OptimizationException;<a name="line.128"></a> <FONT color="green">129</FONT> <a name="line.129"></a> <FONT color="green">130</FONT> }<a name="line.130"></a> </PRE> </BODY> </HTML>