embeddedcomponenttype.java

一个Java持久层类库

//$Id: EmbeddedComponentType.java 10119 2006-07-14 00:09:19Z [e-mail] $
package org.hibernate.type;

import java.lang.reflect.Method;

import org.hibernate.EntityMode;
import org.hibernate.HibernateException;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.tuple.component.ComponentTuplizer;
import org.hibernate.tuple.component.ComponentMetamodel;

/**
 * @author Gavin King
 */
public class EmbeddedComponentType extends ComponentType {

	public boolean isEmbedded() {
		return true;
	}

	public EmbeddedComponentType(ComponentMetamodel metamodel) {
		super( metamodel );
	}

	public boolean isMethodOf(Method method) {
		return ( ( ComponentTuplizer ) tuplizerMapping.getTuplizer(EntityMode.POJO) ).isMethodOf(method);
	}

	public Object instantiate(Object parent, SessionImplementor session)
	throws HibernateException {
		final boolean useParent = parent!=null &&
		                          //TODO: Yuck! This is not quite good enough, it's a quick
		                          //hack around the problem of having a to-one association
		                          //that refers to an embedded component:
		                          super.getReturnedClass().isInstance(parent);

		return useParent ? parent : super.instantiate(parent, session);
	}
}