/*
* 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.examples.manners2009.solver.move;
import java.util.Arrays;
import java.util.Collection;
import org.apache.commons.lang.ObjectUtils;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
import org.drools.planner.core.move.Move;
import org.drools.planner.core.score.director.ScoreDirector;
import org.drools.planner.examples.manners2009.domain.Seat;
import org.drools.planner.examples.manners2009.domain.SeatDesignation;
public class SeatDesignationSwapMove implements Move {
private SeatDesignation leftSeatDesignation;
private SeatDesignation rightSeatDesignation;
public SeatDesignationSwapMove(SeatDesignation leftSeatDesignation, SeatDesignation rightSeatDesignation) {
this.leftSeatDesignation = leftSeatDesignation;
this.rightSeatDesignation = rightSeatDesignation;
}
public boolean isMoveDoable(ScoreDirector scoreDirector) {
return !ObjectUtils.equals(leftSeatDesignation.getSeat(), rightSeatDesignation.getSeat());
}
public Move createUndoMove(ScoreDirector scoreDirector) {
return new SeatDesignationSwapMove(rightSeatDesignation, leftSeatDesignation);
}
public void doMove(ScoreDirector scoreDirector) {
Seat oldLeftSeat = leftSeatDesignation.getSeat();
Seat oldRightSeat = rightSeatDesignation.getSeat();
moveSeat(scoreDirector, leftSeatDesignation, oldRightSeat);
moveSeat(scoreDirector, rightSeatDesignation, oldLeftSeat);
}
// Extract to helper class if other moves are created
private static void moveSeat(ScoreDirector scoreDirector, SeatDesignation seatDesignation, Seat toSeat) {
scoreDirector.beforeVariableChanged(seatDesignation, "seat");
seatDesignation.setSeat(toSeat);
scoreDirector.afterVariableChanged(seatDesignation, "seat");
}
public Collection<? extends Object> getPlanningEntities() {
return Arrays.asList(leftSeatDesignation, rightSeatDesignation);
}
public Collection<? extends Object> getPlanningValues() {
return Arrays.asList(leftSeatDesignation.getSeat(), rightSeatDesignation.getSeat());
}
public boolean equals(Object o) {
if (this == o) {
return true;
} else if (o instanceof SeatDesignationSwapMove) {
SeatDesignationSwapMove other = (SeatDesignationSwapMove) o;
return new EqualsBuilder()
.append(leftSeatDesignation, other.leftSeatDesignation)
.append(rightSeatDesignation, other.rightSeatDesignation)
.isEquals();
} else {
return false;
}
}
public int hashCode() {
return new HashCodeBuilder()
.append(leftSeatDesignation)
.append(rightSeatDesignation)
.toHashCode();
}
public String toString() {
return leftSeatDesignation + " <=> " + rightSeatDesignation;
}
}