Parent.java

package ee.estonia.entities;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToMany;

import org.hibernate.envers.Audited;

/**
 * @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
 */
@Entity
@Audited
public class Parent implements Serializable {
    @Id
    @GeneratedValue
    private Long id;

    private String data;

    @OneToMany
    private Set<Child> collection = new HashSet<Child>();

    public Parent() {
    }

    public Parent(String data) {
        this.data = data;
    }

    public Parent(String data, Long id) {
        this.id = id;
        this.data = data;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof Parent)) return false;

        Parent that = (Parent) o;

        if (data != null ? !data.equals(that.data) : that.data != null) return false;
        if (id != null ? !id.equals(that.id) : that.id != null) return false;

        return true;
    }

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

    @Override
    public String toString() {
        return "Parent(id = " + id + ", data = " + data + ")";
    }

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getData() {
        return data;
    }

    public void setData(String data) {
        this.data = data;
    }

    public Set<Child> getCollection() {
        return collection;
    }

    public void setCollection(Set<Child> collection) {
        this.collection = collection;
    }
}