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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-examples module which contains examples on how to use
Drools Planner.
/*
* 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.nqueens.solver.move;
import java.util.Collection;
import java.util.Collections;
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.nqueens.domain.Queen;
import org.drools.planner.examples.nqueens.domain.Row;
public class RowChangeMove implements Move {
private Queen queen;
private Row toRow;
public RowChangeMove(Queen queen, Row toRow) {
this.queen = queen;
this.toRow = toRow;
}
public boolean isMoveDoable(ScoreDirector scoreDirector) {
return !ObjectUtils.equals(queen.getRow(), toRow);
}
public Move createUndoMove(ScoreDirector scoreDirector) {
return new RowChangeMove(queen, queen.getRow());
}
public void doMove(ScoreDirector scoreDirector) {
scoreDirector.beforeVariableChanged(queen, "row"); // before changes are made
queen.setRow(toRow);
scoreDirector.afterVariableChanged(queen, "row"); // after changes are made
}
public Collection getPlanningEntities() {
return Collections.singletonList(queen);
}
public Collection getPlanningValues() {
return Collections.singletonList(toRow);
}
public boolean equals(Object o) {
if (this == o) {
return true;
} else if (o instanceof RowChangeMove) {
RowChangeMove other = (RowChangeMove) o;
return new EqualsBuilder()
.append(queen, other.queen)
.append(toRow, other.toRow)
.isEquals();
} else {
return false;
}
}
public int hashCode() {
return new HashCodeBuilder()
.append(queen)
.append(toRow)
.toHashCode();
}
public String toString() {
return queen + " => " + toRow;
}
}