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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains the examples which demonstrate how to use it in a normal Java application.

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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.optaplanner.examples.nurserostering.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.optaplanner.core.impl.heuristic.move.Move;
import org.optaplanner.core.impl.score.director.ScoreDirector;
import org.optaplanner.examples.nurserostering.domain.Employee;
import org.optaplanner.examples.nurserostering.domain.ShiftAssignment;

public class ShiftAssignmentSwapMove implements Move {

    private ShiftAssignment leftShiftAssignment;
    private ShiftAssignment rightShiftAssignment;

    public ShiftAssignmentSwapMove(ShiftAssignment leftShiftAssignment, ShiftAssignment rightShiftAssignment) {
        this.leftShiftAssignment = leftShiftAssignment;
        this.rightShiftAssignment = rightShiftAssignment;
    }

    public boolean isMoveDoable(ScoreDirector scoreDirector) {
        return !ObjectUtils.equals(leftShiftAssignment.getEmployee(), rightShiftAssignment.getEmployee());
    }

    public Move createUndoMove(ScoreDirector scoreDirector) {
        return new ShiftAssignmentSwapMove(rightShiftAssignment, leftShiftAssignment);
    }

    public void doMove(ScoreDirector scoreDirector) {
        Employee oldLeftEmployee = leftShiftAssignment.getEmployee();
        Employee oldRightEmployee = rightShiftAssignment.getEmployee();
        NurseRosteringMoveHelper.moveEmployee(scoreDirector, leftShiftAssignment, oldRightEmployee);
        NurseRosteringMoveHelper.moveEmployee(scoreDirector, rightShiftAssignment, oldLeftEmployee);
    }

    public Collection getPlanningEntities() {
        return Arrays.asList(leftShiftAssignment, rightShiftAssignment);
    }

    public Collection getPlanningValues() {
        return Arrays.asList(leftShiftAssignment.getEmployee(), rightShiftAssignment.getEmployee());
    }

    public boolean equals(Object o) {
        if (this == o) {
            return true;
        } else if (o instanceof ShiftAssignmentSwapMove) {
            ShiftAssignmentSwapMove other = (ShiftAssignmentSwapMove) o;
            return new EqualsBuilder()
                    .append(leftShiftAssignment, other.leftShiftAssignment)
                    .append(rightShiftAssignment, other.rightShiftAssignment)
                    .isEquals();
        } else {
            return false;
        }
    }

    public int hashCode() {
        return new HashCodeBuilder()
                .append(leftShiftAssignment)
                .append(rightShiftAssignment)
                .toHashCode();
    }

    public String toString() {
        return leftShiftAssignment + " <=> " + rightShiftAssignment;
    }

}