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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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package org.optaplanner.examples.examination.swingui;

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;

import javax.swing.AbstractAction;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;

import org.optaplanner.examples.examination.domain.ExaminationConstraintConfiguration;

public class ExaminationConstraintConfigurationDialog extends JDialog {

    protected final ExaminationPanel examinationPanel;

    private JSpinner twoInARowPenaltyField;
    private JSpinner twoInADayPenaltyField;
    private JSpinner periodSpreadLengthField;
    private JSpinner periodSpreadPenaltyField;
    private JSpinner mixedDurationPenaltyField;
    private JSpinner frontLoadLargeTopicSizeField;
    private JSpinner frontLoadLastPeriodSizeField;
    private JSpinner frontLoadPenaltyField;
    protected final AbstractAction saveAction;
    protected final AbstractAction cancelAction;

    public ExaminationConstraintConfigurationDialog(Frame owner, ExaminationPanel examinationPanel) {
        super(owner, "Edit examination constraint configuration", true);
        this.examinationPanel = examinationPanel;
        JPanel contentPanel = new JPanel(new BorderLayout(5, 5));
        contentPanel.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
        contentPanel.add(createFormPanel(), BorderLayout.CENTER);
        JPanel buttonPanel = new JPanel(new FlowLayout());
        saveAction = new AbstractAction("Save") {
            @Override
            public void actionPerformed(ActionEvent e) {
                save();
            }
        };
        buttonPanel.add(new JButton(saveAction));
        cancelAction = new AbstractAction("Cancel") {
            @Override
            public void actionPerformed(ActionEvent e) {
                setVisible(false);
            }
        };
        buttonPanel.add(new JButton(cancelAction));
        contentPanel.add(buttonPanel, BorderLayout.SOUTH);
        setContentPane(contentPanel);
        pack();
    }

    private JPanel createFormPanel() {
        JPanel formPanel = new JPanel(new GridLayout(0, 2, 5, 5));
        formPanel.add(new JLabel("2 exams in a row penalty"));
        twoInARowPenaltyField = new JSpinner(new SpinnerNumberModel(0, 0, null, 1));
        formPanel.add(twoInARowPenaltyField);
        formPanel.add(new JLabel("2 exams in a day penalty"));
        twoInADayPenaltyField = new JSpinner(new SpinnerNumberModel(0, 0, null, 1));
        formPanel.add(twoInADayPenaltyField);
        formPanel.add(new JLabel("Period spread length"));
        periodSpreadLengthField = new JSpinner(new SpinnerNumberModel(0, 0, null, 1));
        formPanel.add(periodSpreadLengthField);
        formPanel.add(new JLabel("Period spread penalty"));
        periodSpreadPenaltyField = new JSpinner(new SpinnerNumberModel(0, 0, null, 1));
        formPanel.add(periodSpreadPenaltyField);
        formPanel.add(new JLabel("Exams of mixed duration penalty"));
        mixedDurationPenaltyField = new JSpinner(new SpinnerNumberModel(0, 0, null, 1));
        formPanel.add(mixedDurationPenaltyField);
        formPanel.add(new JLabel("Front load: large exam size"));
        frontLoadLargeTopicSizeField = new JSpinner(new SpinnerNumberModel(0, 0, null, 1));
        frontLoadLargeTopicSizeField.setEnabled(false); // Not yet implemented: requires Topic changes if changed
        formPanel.add(frontLoadLargeTopicSizeField);
        formPanel.add(new JLabel("Front load: last period size"));
        frontLoadLastPeriodSizeField = new JSpinner(new SpinnerNumberModel(0, 0, null, 1));
        frontLoadLastPeriodSizeField.setEnabled(false); // Not yet implemented: requires Period changes if changed
        formPanel.add(frontLoadLastPeriodSizeField);
        formPanel.add(new JLabel("Front load: penalty"));
        frontLoadPenaltyField = new JSpinner(new SpinnerNumberModel(0, 0, null, 1));
        formPanel.add(frontLoadPenaltyField);
        return formPanel;
    }

    public void setExaminationConstraintConfiguration(ExaminationConstraintConfiguration constraintConfiguration) {
        twoInARowPenaltyField.setValue(constraintConfiguration.getTwoInARowPenalty());
        twoInADayPenaltyField.setValue(constraintConfiguration.getTwoInADayPenalty());
        periodSpreadLengthField.setValue(constraintConfiguration.getPeriodSpreadLength());
        periodSpreadPenaltyField.setValue(constraintConfiguration.getPeriodSpreadPenalty());
        mixedDurationPenaltyField.setValue(constraintConfiguration.getMixedDurationPenalty());
        frontLoadLargeTopicSizeField.setValue(constraintConfiguration.getFrontLoadLargeTopicSize());
        frontLoadLastPeriodSizeField.setValue(constraintConfiguration.getFrontLoadLastPeriodSize());
        frontLoadPenaltyField.setValue(constraintConfiguration.getFrontLoadPenalty());
        setLocationRelativeTo(examinationPanel.getTopLevelAncestor());
    }

    private void save() {
        final int twoInARowPenalty = (Integer) twoInARowPenaltyField.getValue();
        final int twoInADayPenalty = (Integer) twoInADayPenaltyField.getValue();
        final int periodSpreadLength = (Integer) periodSpreadLengthField.getValue();
        final int periodSpreadPenalty = (Integer) periodSpreadPenaltyField.getValue();
        final int mixedDurationPenalty = (Integer) mixedDurationPenaltyField.getValue();
        final int frontLoadLargeTopicSize = (Integer) frontLoadLargeTopicSizeField.getValue();
        final int frontLoadLastPeriodSize = (Integer) frontLoadLastPeriodSizeField.getValue();
        final int frontLoadPenalty = (Integer) frontLoadPenaltyField.getValue();
        setVisible(false);
        examinationPanel.doProblemChange((examination, problemChangeDirector) -> {
            ExaminationConstraintConfiguration constraintConfiguration = examination.getConstraintConfiguration();
            problemChangeDirector.changeProblemProperty(constraintConfiguration, workingConstraintConfiguration -> {
                workingConstraintConfiguration.setTwoInARowPenalty(twoInARowPenalty);
                workingConstraintConfiguration.setTwoInADayPenalty(twoInADayPenalty);
                workingConstraintConfiguration.setPeriodSpreadLength(periodSpreadLength);
                workingConstraintConfiguration.setPeriodSpreadPenalty(periodSpreadPenalty);
                workingConstraintConfiguration.setMixedDurationPenalty(mixedDurationPenalty);
                workingConstraintConfiguration.setFrontLoadLargeTopicSize(frontLoadLargeTopicSize);
                workingConstraintConfiguration.setFrontLoadLastPeriodSize(frontLoadLastPeriodSize);
                workingConstraintConfiguration.setFrontLoadPenalty(frontLoadPenalty);
            });
        }, true);
    }

}