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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.
/*
* Copyright 2012 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.move.generic;
import org.apache.commons.lang.ObjectUtils;
import org.drools.planner.core.domain.variable.PlanningVariableDescriptor;
import org.drools.planner.core.move.Move;
import org.drools.planner.core.score.director.ScoreDirector;
public class GenericChainedChangeMove extends GenericChangeMove {
private final Object oldTrailingEntity;
private final Object newTrailingEntity;
public GenericChainedChangeMove(Object planningEntity, PlanningVariableDescriptor planningVariableDescriptor,
Object toPlanningValue, Object oldTrailingEntity, Object newTrailingEntity) {
super(planningEntity, planningVariableDescriptor, toPlanningValue);
this.oldTrailingEntity = oldTrailingEntity;
this.newTrailingEntity = newTrailingEntity;
}
@Override
public boolean isMoveDoable(ScoreDirector scoreDirector) {
return super.isMoveDoable(scoreDirector) && !ObjectUtils.equals(planningEntity, toPlanningValue);
}
@Override
public Move createUndoMove(ScoreDirector scoreDirector) {
Object oldPlanningValue = planningVariableDescriptor.getValue(planningEntity);
return new GenericChainedChangeMove(planningEntity, planningVariableDescriptor, oldPlanningValue,
newTrailingEntity, oldTrailingEntity);
}
@Override
public void doMove(ScoreDirector scoreDirector) {
Object oldPlanningValue = planningVariableDescriptor.getValue(planningEntity);
// Close the old chain
if (oldTrailingEntity != null) {
scoreDirector.beforeVariableChanged(oldTrailingEntity, planningVariableDescriptor.getVariableName());
planningVariableDescriptor.setValue(oldTrailingEntity, oldPlanningValue);
scoreDirector.afterVariableChanged(oldTrailingEntity, planningVariableDescriptor.getVariableName());
}
// Change the entity
scoreDirector.beforeVariableChanged(planningEntity, planningVariableDescriptor.getVariableName());
planningVariableDescriptor.setValue(planningEntity, toPlanningValue);
scoreDirector.afterVariableChanged(planningEntity, planningVariableDescriptor.getVariableName());
// Reroute the new chain
if (newTrailingEntity != null) {
scoreDirector.beforeVariableChanged(newTrailingEntity, planningVariableDescriptor.getVariableName());
planningVariableDescriptor.setValue(newTrailingEntity, planningEntity);
scoreDirector.afterVariableChanged(newTrailingEntity, planningVariableDescriptor.getVariableName());
}
}
}