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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.math.genetics;
+
+/**
+ * Stops after a fixed number of generations. Each time
+ * {@link #isSatisfied(Population)} is invoked, a generation counter is
+ * incremented. Once the counter reaches the configured
+ * <code>maxGenerations</code> value, {@link #isSatisfied(Population)} returns
+ * true.
+ *
+ * @version $Revision: 811685 $ $Date: 2009-09-05 19:36:48 +0200 (sam. 05 sept. 2009) $
+ * @since 2.0
+ */
+public class FixedGenerationCount implements StoppingCondition {
+ /** Number of generations that have passed */
+ private int numGenerations = 0;
+
+ /** Maximum number of generations (stopping criteria) */
+ private final int maxGenerations;
+
+ /**
+ * Create a new FixedGenerationCount instance.
+ *
+ * @param maxGenerations number of generations to evolve
+ */
+ public FixedGenerationCount(int maxGenerations) {
+ if (maxGenerations <= 0)
+ throw new IllegalArgumentException("The number of generations has to be >= 0");
+ this.maxGenerations = maxGenerations;
+ }
+
+ /**
+ * Determine whether or not the given number of generations have passed.
+ * Increments the number of generations counter if the maximum has not
+ * been reached.
+ *
+ * @param population ignored (no impact on result)
+ * @return <code>true</code> IFF the maximum number of generations has been exceeded
+ */
+ public boolean isSatisfied(Population population) {
+ if (this.numGenerations < this.maxGenerations) {
+ numGenerations++;
+ return false;
+ }
+ return true;
+ }
+
+ /**
+ * @return the number of generations that have passed
+ */
+ public int getNumGenerations() {
+ return numGenerations;
+ }
+
+}