/*
* Copyright 2016 Red Hat, Inc. and/or its affiliates.
*
* 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.optaplanner.core.impl.heuristic.selector.value.decorator;
import org.optaplanner.core.api.domain.solution.PlanningSolution;
import org.optaplanner.core.impl.domain.entity.descriptor.EntityDescriptor;
import org.optaplanner.core.impl.domain.variable.descriptor.GenuineVariableDescriptor;
import org.optaplanner.core.impl.domain.variable.inverserelation.SingletonInverseVariableDemand;
import org.optaplanner.core.impl.domain.variable.inverserelation.SingletonInverseVariableSupply;
import org.optaplanner.core.impl.domain.variable.supply.SupplyManager;
import org.optaplanner.core.impl.heuristic.selector.common.decorator.SelectionFilter;
import org.optaplanner.core.impl.score.director.InnerScoreDirector;
import org.optaplanner.core.impl.score.director.ScoreDirector;
/**
* @param <Solution_> the solution type, the class with the {@link PlanningSolution} annotation
*/
public class MovableChainedTrailingValueFilter<Solution_> implements SelectionFilter<Solution_, Object> {
private final GenuineVariableDescriptor<Solution_> variableDescriptor;
public MovableChainedTrailingValueFilter(GenuineVariableDescriptor<Solution_> variableDescriptor) {
this.variableDescriptor = variableDescriptor;
}
@Override
public boolean accept(ScoreDirector<Solution_> scoreDirector, Object value) {
if (value == null) {
return true;
}
SingletonInverseVariableSupply supply = retrieveSingletonInverseVariableSupply(scoreDirector);
Object trailingEntity = supply.getInverseSingleton(value);
EntityDescriptor<Solution_> entityDescriptor = variableDescriptor.getEntityDescriptor();
if (trailingEntity == null || !entityDescriptor.matchesEntity(trailingEntity)) {
return true;
}
return entityDescriptor.getMovableEntitySelectionFilter().accept(scoreDirector, trailingEntity);
}
protected SingletonInverseVariableSupply retrieveSingletonInverseVariableSupply(ScoreDirector<Solution_> scoreDirector) {
// TODO Performance loss because the supply is retrieved for every accept
// A SelectionFilter should be optionally made aware of lifecycle events, so it can cache the supply
SupplyManager supplyManager = ((InnerScoreDirector<Solution_>) scoreDirector).getSupplyManager();
return supplyManager.demand(new SingletonInverseVariableDemand(variableDescriptor));
}
}