001    /*
002     * Copyright 2011 Christian Kumpe http://kumpe.de/christian/java
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     *     http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    package de.kumpe.hadooptimizer.examples.tutorial;
017    
018    import java.util.Collection;
019    
020    import org.apache.commons.logging.Log;
021    import org.apache.commons.logging.LogFactory;
022    
023    import de.kumpe.hadooptimizer.EvaluationResult;
024    import de.kumpe.hadooptimizer.Halter;
025    
026    public class CountingHalter<I> implements Halter<I> {
027            private static final long serialVersionUID = 1L;
028            private static final Log log = LogFactory.getLog(CountingHalter.class);
029    
030            private int nrOfCycles;
031            private int currentCycle;
032    
033            public CountingHalter(final int nrOfCycles) {
034                    this.nrOfCycles = nrOfCycles;
035            }
036    
037            @Override
038            public boolean halt(final Collection<EvaluationResult<I>> evaluationResults) {
039                    log.info("This cycle's best individual: "
040                                    + evaluationResults.iterator().next().getIndividual());
041                    return ++currentCycle >= nrOfCycles;
042            }
043    }