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.impl;
017    
018    import java.util.Collection;
019    import java.util.Collections;
020    
021    import de.kumpe.hadooptimizer.PopulationReader;
022    
023    /**
024     * A {@link PopulationReader} which returns an in memory collection of
025     * individuals.
026     * 
027     * @param <I>
028     *            the individuals' type
029     * 
030     * @author <a href="http://kumpe.de/christian/java">Christian Kumpe</a>
031     */
032    public class MemoryPopulationReader<I> implements PopulationReader<I> {
033            private static final long serialVersionUID = 1L;
034    
035            private final Collection<I> population;
036    
037            public MemoryPopulationReader(final I individual) {
038                    this(Collections.singleton(individual));
039            }
040    
041            public MemoryPopulationReader(final Collection<I> population) {
042                    this.population = population;
043            }
044    
045            @Override
046            public Collection<I> read() {
047                    return population;
048            }
049    
050            public Collection<I> getPopulation() {
051                    return population;
052            }
053    }