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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.

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/*
 * 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.domain;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.drools.planner.api.domain.solution.PlanningEntityCollectionProperty;
import org.drools.planner.core.score.buildin.simple.SimpleScore;
import org.drools.planner.core.solution.Solution;
import org.drools.planner.examples.common.domain.AbstractPersistable;

public class NQueens extends AbstractPersistable implements Solution {

    private int n;

    // Problem facts
    private List columnList;
    private List rowList;

    // Planning entities
    private List queenList;

    private SimpleScore score;

    public int getN() {
        return n;
    }

    public void setN(int n) {
        this.n = n;
    }

    public List getColumnList() {
        return columnList;
    }

    public void setColumnList(List columnList) {
        this.columnList = columnList;
    }

    public List getRowList() {
        return rowList;
    }

    public void setRowList(List rowList) {
        this.rowList = rowList;
    }

    @PlanningEntityCollectionProperty
    public List getQueenList() {
        return queenList;
    }

    public void setQueenList(List queenList) {
        this.queenList = queenList;
    }

    public SimpleScore getScore() {
        return score;
    }

    public void setScore(SimpleScore score) {
        this.score = score;
    }

    // ************************************************************************
    // Complex methods
    // ************************************************************************

    public Collection getProblemFacts() {
        List