Child2Entity.java

package org.hibernate.envers.test.entities.manytomany.sametable;
import java.util.ArrayList;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import org.hibernate.annotations.WhereJoinTable;
import org.hibernate.envers.Audited;

/**
 * @author Adam Warski (adam at warski dot org)
 */
@Entity
@Audited
public class Child2Entity {
    @Id
    @GeneratedValue
    private Integer id;

    private String child2Data;

    public Child2Entity() {
    }

    public Child2Entity(String child2Data) {
        this.child2Data = child2Data;
    }

    public Child2Entity(Integer id, String child2Data) {
        this.id = id;
        this.child2Data = child2Data;
    }

    @ManyToMany(fetch = FetchType.LAZY)
	@JoinTable(
		name = "children",
		joinColumns = @JoinColumn(name = "child2_id"),
		inverseJoinColumns = @JoinColumn(name = "parent_id", insertable = false, updatable = false)
	)
	@WhereJoinTable(clause = "child2_id is not null")
	private List<ParentEntity> parents = new ArrayList<ParentEntity>();

    public Integer getId() {
        return id;
    }

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

    public String getChild2Data() {
        return child2Data;
    }

    public void setChild2Data(String child2Data) {
        this.child2Data = child2Data;
    }

    public List<ParentEntity> getParents() {
        return parents;
    }

    public void setParents(List<ParentEntity> parents) {
        this.parents = parents;
    }

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

        Child2Entity that = (Child2Entity) o;

        if (child2Data != null ? !child2Data.equals(that.child2Data) : that.child2Data != null) return false;
        //noinspection RedundantIfStatement
        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 + (child2Data != null ? child2Data.hashCode() : 0);
        return result;
    }

    public String toString() {
        return "C2E(id = " + id + ", child2Data = " + child2Data + ")";
    }
}