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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;

import java.util.List;
import java.util.concurrent.Callable;

/**
 * Callable task for performing parallel fitness evaluations.
 * @param  The type of entity for which fitness is calculated.
 * @author Daniel Dyer
 */
class FitnessEvalutationTask implements Callable>
{
    private final FitnessEvaluator fitnessEvaluator;
    private final T candidate;
    private final List population;

    /**
     * Creates a task for performing fitness evaluations.
     * @param fitnessEvaluator The fitness function used to determine candidate fitness.
     * @param candidate The candidate to evaluate.
     * @param population The entire current population.  This will include all
     * of the candidates to evaluate along with any other individuals that are
     * not being evaluated by this task.
     */
    FitnessEvalutationTask(FitnessEvaluator fitnessEvaluator,
                           T candidate,
                           List population)
    {
        this.fitnessEvaluator = fitnessEvaluator;
        this.candidate = candidate;
        this.population = population;
    }


    public EvaluatedCandidate call()
    {
        return new EvaluatedCandidate(candidate,
                                         fitnessEvaluator.getFitness(candidate, population));
    }
}