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.simple;
017    
018    import java.util.Collection;
019    
020    import de.kumpe.hadooptimizer.EaOptimizerConfiguration;
021    import de.kumpe.hadooptimizer.Optimizer;
022    
023    /**
024     * A simple (not multithreaded) {@link Optimizer} implementation for general
025     * evolutionary algorithms.
026     * 
027     * @param <I>
028     *            the individuals' type
029     * 
030     * @see Optimizer
031     * @see SimpleOptimizerBase
032     * 
033     * @author <a href="http://kumpe.de/christian/java">Christian Kumpe</a>
034     */
035    public class SimpleEaOptimizer<I> extends SimpleOptimizerBase<I> {
036            public SimpleEaOptimizer(final EaOptimizerConfiguration<I> configuration) {
037                    super(configuration);
038            }
039    
040            @Override
041            protected EaOptimizerConfiguration<I> getConfiguration() {
042                    return (EaOptimizerConfiguration<I>) super.getConfiguration();
043            }
044    
045            @Override
046            void processPopulation() {
047                    final Collection<I> children = getConfiguration().getRecombiner()
048                                    .recombine(evaluationResults);
049    
050                    if (!getConfiguration().isPreserveParents()) {
051                            evaluationResults.clear();
052                    }
053    
054                    for (final I child : children) {
055                            processChild(child, getConfiguration());
056                    }
057            }
058    }