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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.meetingscheduling.domain;

import org.apache.commons.text.WordUtils;
import org.optaplanner.core.api.domain.entity.PlanningEntity;
import org.optaplanner.core.api.domain.entity.PlanningPin;
import org.optaplanner.core.api.domain.variable.PlanningVariable;
import org.optaplanner.examples.common.domain.AbstractPersistable;

@PlanningEntity
public class MeetingAssignment extends AbstractPersistable {

    private Meeting meeting;
    private boolean pinned;

    // Planning variables: changes during planning, between score calculations.
    private TimeGrain startingTimeGrain;
    private Room room;

    public MeetingAssignment() {
    }

    public MeetingAssignment(long id) {
        super(id);
    }

    public MeetingAssignment(long id, Meeting meeting) {
        this(id);
        this.meeting = meeting;
    }

    public MeetingAssignment(long id, Meeting meeting, TimeGrain startingTimeGrain, Room room) {
        this(id, meeting);
        this.startingTimeGrain = startingTimeGrain;
        this.room = room;
    }

    public Meeting getMeeting() {
        return meeting;
    }

    public void setMeeting(Meeting meeting) {
        this.meeting = meeting;
    }

    @PlanningPin
    public boolean isPinned() {
        return pinned;
    }

    public void setPinned(boolean pinned) {
        this.pinned = pinned;
    }

    @PlanningVariable
    public TimeGrain getStartingTimeGrain() {
        return startingTimeGrain;
    }

    public void setStartingTimeGrain(TimeGrain startingTimeGrain) {
        this.startingTimeGrain = startingTimeGrain;
    }

    @PlanningVariable
    public Room getRoom() {
        return room;
    }

    public void setRoom(Room room) {
        this.room = room;
    }

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

    public int calculateOverlap(MeetingAssignment other) {
        if (startingTimeGrain == null || other.getStartingTimeGrain() == null) {
            return 0;
        }
        // start is inclusive, end is exclusive
        int start = startingTimeGrain.getGrainIndex();
        int otherStart = other.startingTimeGrain.getGrainIndex();
        int otherEnd = otherStart + other.meeting.getDurationInGrains();
        if (otherEnd < start) {
            return 0;
        }
        int end = start + meeting.getDurationInGrains();
        if (end < otherStart) {
            return 0;
        }
        return Math.min(end, otherEnd) - Math.max(start, otherStart);
    }

    public Integer getLastTimeGrainIndex() {
        if (startingTimeGrain == null) {
            return null;
        }
        return startingTimeGrain.getGrainIndex() + meeting.getDurationInGrains() - 1;
    }

    public String getStartingDateTimeString() {
        if (startingTimeGrain == null) {
            return null;
        }
        return startingTimeGrain.getDateTimeString();
    }

    public int getRoomCapacity() {
        if (room == null) {
            return 0;
        }
        return room.getCapacity();
    }

    public int getRequiredCapacity() {
        return meeting.getRequiredCapacity();
    }

    public String getLabel() {
        int wrapLength = Math.max(8 * meeting.getDurationInGrains(), 16);
        return "" + WordUtils.wrap(meeting.getTopic(), wrapLength, "
", false) + "";
    }

    @Override
    public String toString() {
        return meeting.toString();
    }

}