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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.domain;

import java.util.Arrays;
import java.util.Set;
import java.util.stream.Collectors;

import org.optaplanner.examples.common.domain.AbstractPersistable;
import org.optaplanner.examples.common.persistence.jackson.JacksonUniqueIdGenerator;

import com.fasterxml.jackson.annotation.JsonIdentityInfo;
import com.fasterxml.jackson.annotation.JsonIgnore;

@JsonIdentityInfo(generator = JacksonUniqueIdGenerator.class)
public class Topic extends AbstractPersistable {

    private int duration; // in minutes
    private Set studentSet;

    // Calculated during initialization, not modified during score calculation.
    private boolean frontLoadLarge;
    private Set coincidenceTopicSet = null;

    public int getDuration() {
        return duration;
    }

    public void setDuration(int duration) {
        this.duration = duration;
    }

    public Set getStudentSet() {
        return studentSet;
    }

    public void setStudentSet(Set studentSet) {
        this.studentSet = studentSet;
    }

    @JsonIgnore
    public int getStudentSize() {
        return studentSet.size();
    }

    public boolean isFrontLoadLarge() {
        return frontLoadLarge;
    }

    public void setFrontLoadLarge(boolean frontLoadLarge) {
        this.frontLoadLarge = frontLoadLarge;
    }

    public Set getCoincidenceTopicSet() {
        return coincidenceTopicSet;
    }

    public void setCoincidenceTopicSet(Set coincidenceTopicSet) {
        this.coincidenceTopicSet = coincidenceTopicSet;
    }

    public boolean hasCoincidenceTopic() {
        return coincidenceTopicSet != null;
    }

    @Override
    public String toString() {
        return id == null ? "no id" : Long.toString(id);
    }

    // ************************************************************************
    // With methods
    // ************************************************************************

    public Topic withId(long id) {
        this.setId(id);
        return this;
    }

    public Topic withDuration(int duration) {
        this.setDuration(duration);
        return this;
    }

    public Topic withStudents(Student... students) {
        this.setStudentSet(Arrays.stream(students).collect(Collectors.toSet()));
        return this;
    }

    public Topic withFrontLoadLarge(boolean frontLoadLarge) {
        this.setFrontLoadLarge(frontLoadLarge);
        return this;
    }

    public Topic withCoincidenceTopicSet(Set coincidenceTopicSet) {
        this.setCoincidenceTopicSet(coincidenceTopicSet);
        return this;
    }
}