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Java example source code file (SolutionCallback.java)

This example Java source code file (SolutionCallback.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

optimizationdata, pointvaluepair, simplextableau, solutioncallback

The SolutionCallback.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.math3.optim.linear;

import org.apache.commons.math3.optim.OptimizationData;
import org.apache.commons.math3.optim.PointValuePair;

/**
 * A callback object that can be provided to a linear optimizer to keep track
 * of the best solution found.
 *
 * @since 3.3
 */
public class SolutionCallback implements OptimizationData {
    /** The SimplexTableau used by the SimplexSolver. */
    private SimplexTableau tableau;

    /**
     * Set the simplex tableau used during the optimization once a feasible
     * solution has been found.
     *
     * @param tableau the simplex tableau containing a feasible solution
     */
    void setTableau(final SimplexTableau tableau) {
        this.tableau = tableau;
    }

    /**
     * Retrieve the best solution found so far.
     * <p>
     * <b>Note: the returned solution may not be optimal, e.g. in case
     * the optimizer did reach the iteration limits.
     *
     * @return the best solution found so far by the optimizer, or {@code null} if
     * no feasible solution could be found
     */
    public PointValuePair getSolution() {
        return tableau != null ? tableau.getSolution() : null;
    }

    /**
     * Returns if the found solution is optimal.
     * @return {@code true} if the solution is optimal, {@code false} otherwise
     */
    public boolean isSolutionOptimal() {
        return tableau != null ? tableau.isOptimal() : false;
    }
}

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