Parent.java

//$Id$
package org.hibernate.test.annotations.onetomany;
import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import org.hibernate.annotations.BatchSize;

/**
 * @author Emmanuel Bernard
 */
@Entity
public class Parent implements Serializable {
	@Id
	public ParentPk id;
	public int age;

	@OneToMany(cascade = CascadeType.ALL, mappedBy = "parent")
	@BatchSize(size = 5)
	@javax.persistence.OrderBy("favoriteSuperhero asc, favoriteSinger desc")
	public Set<Child> children;

	public int hashCode() {
		//a NPE can occurs, but I don't expect hashcode to be used before pk is set
		return id.hashCode();
	}

	public boolean equals(Object obj) {
		//a NPE can occurs, but I don't expect equals to be used before pk is set
		if ( obj != null && obj instanceof Parent ) {
			return id.equals( ( (Parent) obj ).id );
		}
		else {
			return false;
		}
	}

	public void addChild(Child child) {
		if ( children == null ) {
			children = new HashSet();
		}
		child.parent = this;
		children.add( child );
	}
}