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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 java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.Comparator;
import java.util.Objects;

import org.optaplanner.examples.common.domain.AbstractPersistable;
import org.optaplanner.examples.common.swingui.components.Labeled;

public class TimeGrain extends AbstractPersistable
        implements Comparable, Labeled {

    private static final Comparator COMPARATOR = Comparator.comparing(TimeGrain::getDay)
            .thenComparingInt(TimeGrain::getStartingMinuteOfDay);

    /**
     * Time granularity is 15 minutes (which is often recommended when dealing with humans for practical purposes).
     */
    public static final int GRAIN_LENGTH_IN_MINUTES = 15;

    private int grainIndex;
    private Day day;
    private int startingMinuteOfDay;

    public TimeGrain() {
    }

    public TimeGrain(long id, int grainIndex, Day day, int startingMinuteOfDay) {
        super(id);
        this.grainIndex = grainIndex;
        this.day = day;
        this.startingMinuteOfDay = startingMinuteOfDay;
    }

    public int getGrainIndex() {
        return grainIndex;
    }

    public void setGrainIndex(int grainIndex) {
        this.grainIndex = grainIndex;
    }

    public Day getDay() {
        return day;
    }

    public void setDay(Day day) {
        this.day = day;
    }

    public int getStartingMinuteOfDay() {
        return startingMinuteOfDay;
    }

    public void setStartingMinuteOfDay(int startingMinuteOfDay) {
        this.startingMinuteOfDay = startingMinuteOfDay;
    }

    public LocalDate getDate() {
        return day.toDate();
    }

    public LocalTime getTime() {
        return LocalTime.of(startingMinuteOfDay / 60, startingMinuteOfDay % 60);
    }

    public LocalDateTime getDateTime() {
        return LocalDateTime.of(getDate(), getTime());
    }

    public String getTimeString() {
        int hourOfDay = startingMinuteOfDay / 60;
        int minuteOfHour = startingMinuteOfDay % 60;
        return (hourOfDay < 10 ? "0" : "") + hourOfDay
                + ":" + (minuteOfHour < 10 ? "0" : "") + minuteOfHour;
    }

    public String getDateTimeString() {
        return day.getDateString() + " " + getTimeString();
    }

    @Override
    public String getLabel() {
        return getTimeString();
    }

    @Override
    public String toString() {
        return grainIndex + "(" + getDateTimeString() + ")";
    }

    @Override
    public boolean equals(Object other) {
        if (this == other)
            return true;
        if (other == null || getClass() != other.getClass())
            return false;

        TimeGrain timeGrain = (TimeGrain) other;

        if (startingMinuteOfDay != timeGrain.startingMinuteOfDay)
            return false;
        return Objects.equals(day, timeGrain.day);
    }

    @Override
    public int hashCode() {
        int result = day != null ? day.hashCode() : 0;
        result = 31 * result + startingMinuteOfDay;
        return result;
    }

    @Override
    public int compareTo(TimeGrain other) {
        return COMPARATOR.compare(this, other);
    }
}