/*
* 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.pas.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.WorkingMemory;
import org.drools.runtime.rule.FactHandle;
import org.drools.planner.core.localsearch.decider.acceptor.tabu.TabuPropertyEnabled;
import org.drools.planner.core.move.Move;
import org.drools.planner.examples.pas.domain.Bed;
import org.drools.planner.examples.pas.domain.BedDesignation;
public class BedDesignationSwitchMove implements Move, TabuPropertyEnabled {
private BedDesignation leftBedDesignation;
private BedDesignation rightBedDesignation;
public BedDesignationSwitchMove(BedDesignation leftBedDesignation, BedDesignation rightBedDesignation) {
this.leftBedDesignation = leftBedDesignation;
this.rightBedDesignation = rightBedDesignation;
}
public boolean isMoveDoable(WorkingMemory workingMemory) {
return !ObjectUtils.equals(leftBedDesignation.getBed(), rightBedDesignation.getBed());
}
public Move createUndoMove(WorkingMemory workingMemory) {
return new BedDesignationSwitchMove(rightBedDesignation, leftBedDesignation);
}
public void doMove(WorkingMemory workingMemory) {
Bed oldLeftBed = leftBedDesignation.getBed();
Bed oldRightBed = rightBedDesignation.getBed();
moveBed(workingMemory, leftBedDesignation, oldRightBed);
moveBed(workingMemory, rightBedDesignation, oldLeftBed);
}
// Extract to helper class if other moves are created
private static void moveBed(WorkingMemory workingMemory, BedDesignation bedDesignation, Bed toBed) {
FactHandle factHandle = workingMemory.getFactHandle(bedDesignation);
bedDesignation.setBed(toBed);
workingMemory.update(factHandle, bedDesignation);
}
public Collection<? extends Object> getTabuProperties() {
return Arrays.<BedDesignation>asList(leftBedDesignation, rightBedDesignation);
}
public boolean equals(Object o) {
if (this == o) {
return true;
} else if (o instanceof BedDesignationSwitchMove) {
BedDesignationSwitchMove other = (BedDesignationSwitchMove) o;
return new EqualsBuilder()
.append(leftBedDesignation, other.leftBedDesignation)
.append(rightBedDesignation, other.rightBedDesignation)
.isEquals();
} else {
return false;
}
}
public int hashCode() {
return new HashCodeBuilder()
.append(leftBedDesignation)
.append(rightBedDesignation)
.toHashCode();
}
public String toString() {
return leftBedDesignation + " <=> " + rightBedDesignation;
}
}