/*
* Copyright 2011 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.examples.tsp.solver.move;
import java.util.Collection;
import java.util.Collections;
import java.util.StringTokenizer;
import org.apache.commons.lang.ObjectUtils;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.drools.WorkingMemory;
import org.drools.planner.core.localsearch.decider.acceptor.tabu.TabuPropertyEnabled;
import org.drools.planner.core.move.Move;
import org.drools.planner.examples.tsp.domain.CityAssignment;
public class SubTourChangeMove implements Move, TabuPropertyEnabled {
private CityAssignment startCityAssignment;
private CityAssignment endCityAssignment;
private CityAssignment toAfterCityAssignment;
public SubTourChangeMove(CityAssignment startCityAssignment, CityAssignment endCityAssignment, CityAssignment toAfterCityAssignment) {
this.startCityAssignment = startCityAssignment;
this.endCityAssignment = endCityAssignment;
this.toAfterCityAssignment = toAfterCityAssignment;
}
public boolean isMoveDoable(WorkingMemory workingMemory) {
CityAssignment nextCityAssignment = startCityAssignment;
if (ObjectUtils.equals(startCityAssignment, toAfterCityAssignment.getNextCityAssignment())) {
return false;
}
while (!ObjectUtils.equals(nextCityAssignment, endCityAssignment)) {
if (ObjectUtils.equals(nextCityAssignment, toAfterCityAssignment)) {
return false;
}
nextCityAssignment = nextCityAssignment.getNextCityAssignment();
}
if (ObjectUtils.equals(endCityAssignment, toAfterCityAssignment)) {
return false;
}
return true;
}
public Move createUndoMove(WorkingMemory workingMemory) {
return new SubTourChangeMove(startCityAssignment, endCityAssignment,
startCityAssignment.getPreviousCityAssignment());
}
public void doMove(WorkingMemory workingMemory) {
CityAssignment newPreviousCityAssignment = toAfterCityAssignment;
CityAssignment newNextCityAssignment = newPreviousCityAssignment.getNextCityAssignment();
CityAssignment originalPreviousCityAssignment = startCityAssignment.getPreviousCityAssignment();
CityAssignment originalNextCityAssignment = endCityAssignment.getNextCityAssignment();
TspMoveHelper.moveCityAssignmentAfterCityAssignment(workingMemory, newPreviousCityAssignment, startCityAssignment);
TspMoveHelper.moveCityAssignmentAfterCityAssignment(workingMemory, endCityAssignment, newNextCityAssignment);
TspMoveHelper.moveCityAssignmentAfterCityAssignment(workingMemory, originalPreviousCityAssignment, originalNextCityAssignment);
}
public Collection<? extends Object> getTabuProperties() {
return Collections.singletonList(startCityAssignment.getCity());
}
public boolean equals(Object o) {
if (this == o) {
return true;
} else if (o instanceof SubTourChangeMove) {
SubTourChangeMove other = (SubTourChangeMove) o;
return new EqualsBuilder()
.append(startCityAssignment, other.startCityAssignment)
.append(endCityAssignment, other.endCityAssignment)
.append(toAfterCityAssignment, other.toAfterCityAssignment)
.isEquals();
} else {
return false;
}
}
public int hashCode() {
return new HashCodeBuilder()
.append(startCityAssignment)
.append(endCityAssignment)
.append(toAfterCityAssignment)
.toHashCode();
}
public String toString() {
return startCityAssignment + "-" + endCityAssignment + " => after " + toAfterCityAssignment;
}
}