org.drools.planner.core.localsearch.decider.selector.MoveFactorySelector Maven / Gradle / Ivy

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Drools Planner optimizes automated planning by combining metaheuristic search algorithms with rule engine powered score calculation. This is the drools-planner-core module which contains metaheuristic algorithms.

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/*
 * Copyright 2010 JBoss Inc
 *
 * 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.drools.planner.core.localsearch.decider.selector;

import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import org.drools.planner.core.localsearch.LocalSearchSolverPhaseScope;
import org.drools.planner.core.localsearch.LocalSearchStepScope;
import org.drools.planner.core.localsearch.decider.Decider;
import org.drools.planner.core.move.Move;
import org.drools.planner.core.move.factory.MoveFactory;

public class MoveFactorySelector extends AbstractSelector {

    protected MoveFactory moveFactory;

    protected boolean shuffle = true;

    public void setMoveFactory(MoveFactory moveFactory) {
        this.moveFactory = moveFactory;
    }

    public void setShuffle(boolean shuffle) {
        this.shuffle = shuffle;
    }

    @Override
    public void setDecider(Decider decider) {
        super.setDecider(decider);
        moveFactory.setDecider(decider);
    }

    // ************************************************************************
    // Worker methods
    // ************************************************************************

    @Override
    public void phaseStarted(LocalSearchSolverPhaseScope localSearchSolverPhaseScope) {
        moveFactory.phaseStarted(localSearchSolverPhaseScope);
    }

    @Override
    public void beforeDeciding(LocalSearchStepScope localSearchStepScope) {
        moveFactory.beforeDeciding(localSearchStepScope);
    }

    public Iterator moveIterator(LocalSearchStepScope localSearchStepScope) {
        return selectMoveList(localSearchStepScope).iterator();
    }

    public List selectMoveList(LocalSearchStepScope localSearchStepScope) {
        List moveList = moveFactory.createMoveList(localSearchStepScope.getWorkingSolution());
        if (shuffle) {
            Collections.shuffle(moveList, localSearchStepScope.getWorkingRandom());
        }
        return moveList;
    }

    @Override
    public void stepTaken(LocalSearchStepScope localSearchStepScope) {
        moveFactory.stepTaken(localSearchStepScope);
    }

    @Override
    public void phaseEnded(LocalSearchSolverPhaseScope localSearchSolverPhaseScope) {
        moveFactory.phaseEnded(localSearchSolverPhaseScope);
    }

}