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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.nurserostering.swingui;

import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

import org.drools.planner.core.solution.Solution;
import org.drools.planner.examples.common.swingui.SolutionPanel;
import org.drools.planner.examples.nurserostering.domain.ShiftAssignment;
import org.drools.planner.examples.nurserostering.domain.ShiftDate;
import org.drools.planner.examples.nurserostering.domain.NurseRoster;
import org.drools.planner.examples.nurserostering.domain.Employee;
import org.drools.planner.examples.nurserostering.domain.WeekendDefinition;
import org.drools.planner.examples.nurserostering.solver.move.EmployeeChangeMove;

/**
 * TODO this code is highly unoptimized
 */
public class NurseRosteringPanel extends SolutionPanel {

    private static final Color HEADER_COLOR = Color.YELLOW;

    private GridLayout gridLayout;

    public NurseRosteringPanel() {
        gridLayout = new GridLayout(0, 1);
        setLayout(gridLayout);
    }

    private NurseRoster getNurseRoster() {
        return (NurseRoster) solutionBusiness.getSolution();
    }

    public void resetPanel(Solution solution) {
        removeAll();
        NurseRoster nurseRoster = (NurseRoster) solution;
        gridLayout.setColumns(nurseRoster.getShiftDateList().size() + 1);
        JLabel headerCornerLabel = new JLabel("E \\ SD");
        headerCornerLabel.setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createLineBorder(Color.DARK_GRAY),
                BorderFactory.createEmptyBorder(2, 2, 2, 2)));
        headerCornerLabel.setBackground(HEADER_COLOR);
        headerCornerLabel.setOpaque(true);
        add(headerCornerLabel);
        for (ShiftDate shiftDate : nurseRoster.getShiftDateList()) {
            JLabel shiftDateLabel = new JLabel(shiftDate.getLabel());
            shiftDateLabel.setBorder(BorderFactory.createCompoundBorder(
                    BorderFactory.createLineBorder(Color.DARK_GRAY),
                    BorderFactory.createEmptyBorder(2, 2, 2, 2)));
            shiftDateLabel.setBackground(HEADER_COLOR);
            shiftDateLabel.setOpaque(true);
            add(shiftDateLabel);
        }
        Map> employeeShiftDatePanelMap = new HashMap>();
        for (Employee employee : nurseRoster.getEmployeeList()) {
            createEmployeeLine(nurseRoster, employeeShiftDatePanelMap, employee);
        }
        createEmployeeLine(nurseRoster, employeeShiftDatePanelMap, null);
        for (ShiftAssignment shiftAssignment : nurseRoster.getShiftAssignmentList()) {
            Employee employee = shiftAssignment.getEmployee();
            EmployeeShiftDatePanel employeeShiftDatePanel = employeeShiftDatePanelMap.get(employee).get(shiftAssignment.getShiftDate());
            employeeShiftDatePanel.addShiftAssignment(shiftAssignment);
        }
    }

    private void createEmployeeLine(NurseRoster nurseRoster, Map> employeeShiftDatePanelMap, Employee employee) {
        JLabel employeeLabel = new JLabel(employee == null ? "Unassigned" : employee.toString());
        employeeLabel.setBorder(BorderFactory.createCompoundBorder(
                BorderFactory.createLineBorder(Color.DARK_GRAY),
                BorderFactory.createEmptyBorder(2, 2, 2, 2)));
        employeeLabel.setBackground(HEADER_COLOR);
        employeeLabel.setOpaque(true);
        add(employeeLabel);
        Map shiftDatePanelMap = new HashMap();
        employeeShiftDatePanelMap.put(employee, shiftDatePanelMap);
        for (ShiftDate shiftDate : nurseRoster.getShiftDateList()) {
            EmployeeShiftDatePanel employeeShiftDatePanel = new EmployeeShiftDatePanel();
            WeekendDefinition weekendDefinition = (employee == null) ? WeekendDefinition.SATURDAY_SUNDAY
                    : employee.getContract().getWeekendDefinition();
            if (weekendDefinition.isWeekend(shiftDate.getDayOfWeek())) {
                employeeShiftDatePanel.setBackground(Color.LIGHT_GRAY);
            }
            employeeShiftDatePanel.setToolTipText((employee == null ? "Unassigned" : "employee " + employee.getCode())
                    + " on dayIndex " + shiftDate.getDayIndex());
            add(employeeShiftDatePanel);
            shiftDatePanelMap.put(shiftDate, employeeShiftDatePanel);
        }
    }

    private class EmployeeShiftDatePanel extends JPanel {

        public EmployeeShiftDatePanel() {
            super(new GridLayout(0, 1));
            setBorder(BorderFactory.createCompoundBorder(
                    BorderFactory.createLineBorder(Color.DARK_GRAY),
                    BorderFactory.createEmptyBorder(2, 2, 2, 2)));
        }

        public void addShiftAssignment(ShiftAssignment shiftAssignment) {
            JButton button = new JButton(new ShiftAssignmentAction(shiftAssignment));
            add(button);
        }

    }

    private class ShiftAssignmentAction extends AbstractAction {

        private ShiftAssignment shiftAssignment;

        public ShiftAssignmentAction(ShiftAssignment shiftAssignment) {
            super(shiftAssignment.getLabel());
            this.shiftAssignment = shiftAssignment;
        }

        public void actionPerformed(ActionEvent e) {
            List employeeList = getNurseRoster().getEmployeeList();
            JComboBox employeeListField = new JComboBox(employeeList.toArray());
            employeeListField.setSelectedItem(shiftAssignment.getEmployee());
            int result = JOptionPane.showConfirmDialog(NurseRosteringPanel.this.getRootPane(), employeeListField,
                    "Select employee", JOptionPane.OK_CANCEL_OPTION);
            if (result == JOptionPane.OK_OPTION) {
                Employee toEmployee = (Employee) employeeListField.getSelectedItem();
                solutionBusiness.doMove(new EmployeeChangeMove(shiftAssignment, toEmployee));
                solverAndPersistenceFrame.resetScreen();
            }
        }

    }

}