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+/*
+ * 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);
+ }
+ }
+}