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Java example source code file (AbstractOptimizationProblem.java)

This example Java source code file (AbstractOptimizationProblem.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

abstractoptimizationproblem, convergencechecker, incrementor, max_eval_callback, max_iter_callback, maxevalcallback, maxitercallback, toomanyevaluationsexception, toomanyiterationsexception

The AbstractOptimizationProblem.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;

import org.apache.commons.math3.exception.TooManyEvaluationsException;
import org.apache.commons.math3.exception.TooManyIterationsException;
import org.apache.commons.math3.util.Incrementor;

/**
 * Base class for implementing optimization problems. It contains the boiler-plate code
 * for counting the number of evaluations of the objective function and the number of
 * iterations of the algorithm, and storing the convergence checker.
 *
 * @param <PAIR> Type of the point/value pair returned by the optimization algorithm.
 * @since 3.3
 */
public abstract class AbstractOptimizationProblem<PAIR>
        implements OptimizationProblem<PAIR> {

    /** Callback to use for the evaluation counter. */
    private static final MaxEvalCallback MAX_EVAL_CALLBACK = new MaxEvalCallback();
    /** Callback to use for the iteration counter. */
    private static final MaxIterCallback MAX_ITER_CALLBACK = new MaxIterCallback();

    /** max evaluations */
    private final int maxEvaluations;
    /** max iterations */
    private final int maxIterations;
    /** Convergence checker. */
    private final ConvergenceChecker<PAIR> checker;

    /**
     * Create an {@link AbstractOptimizationProblem} from the given data.
     *
     * @param maxEvaluations the number of allowed model function evaluations.
     * @param maxIterations  the number of allowed iterations.
     * @param checker        the convergence checker.
     */
    protected AbstractOptimizationProblem(final int maxEvaluations,
                                          final int maxIterations,
                                          final ConvergenceChecker<PAIR> checker) {
        this.maxEvaluations = maxEvaluations;
        this.maxIterations = maxIterations;
        this.checker = checker;
    }

    /** {@inheritDoc} */
    public Incrementor getEvaluationCounter() {
        return new Incrementor(this.maxEvaluations, MAX_EVAL_CALLBACK);
    }

    /** {@inheritDoc} */
    public Incrementor getIterationCounter() {
        return new Incrementor(this.maxIterations, MAX_ITER_CALLBACK);
    }

    /** {@inheritDoc} */
    public ConvergenceChecker<PAIR> getConvergenceChecker() {
        return checker;
    }

    /** Defines the action to perform when reaching the maximum number of evaluations. */
    private static class MaxEvalCallback
            implements Incrementor.MaxCountExceededCallback {
        /**
         * {@inheritDoc}
         *
         * @throws TooManyEvaluationsException
         */
        public void trigger(int max) {
            throw new TooManyEvaluationsException(max);
        }
    }

    /** Defines the action to perform when reaching the maximum number of evaluations. */
    private static class MaxIterCallback
            implements Incrementor.MaxCountExceededCallback {
        /**
         * {@inheritDoc}
         *
         * @throws TooManyIterationsException
         */
        public void trigger(int max) {
            throw new TooManyIterationsException(max);
        }
    }

}

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