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//=============================================================================
// Copyright 2006-2010 Daniel W. Dyer
//
// Licensed 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.uncommons.watchmaker.framework.operators;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import org.uncommons.watchmaker.framework.EvolutionaryOperator;
/**
* Evolutionary operator that simply returns the selected candidates unaltered.
* This can be useful when combined with {@link SplitEvolution} so that a
* proportion of the selected candidates can be copied unaltered into the next
* generation while the remainder are evolved.
* @param <T> The type of evolvable entity that this operator is used with.
* @author Daniel Dyer
*/
public class IdentityOperator<T> implements EvolutionaryOperator<T>
{
/**
* Returns the selected candidates unaltered.
* @param selectedCandidates The candidates to "evolve" (or do
* nothing to in this case).
* @param rng A source of randomness (not used).
* @return The unaltered candidates.
*/
public List<T> apply(List<T> selectedCandidates, Random rng)
{
return new ArrayList<T>(selectedCandidates);
}
}
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