Hibernate example source code file (ProxyHelper.java)

This example Hibernate source code file (ProxyHelper.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

class, class, country, country, cuisine, cuisine, dataproxyhandler, dataproxyhandler, invocationhandler, io, proxyhelper, reflection, string

The Hibernate ProxyHelper.java source code

//$Id$
package org.hibernate.test.annotations.tuplizer;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

/**
 * @author Emmanuel Bernard
 */
public class ProxyHelper {

	public static Country newPersonProxy() {
		return newCountryProxy( null );
	}

	public static Country newCountryProxy(Serializable id) {
		return ( Country ) Proxy.newProxyInstance(
				Country.class.getClassLoader(),
		        new Class[] {Country.class},
		        new DataProxyHandler( Country.class.getName(), id )
		);
	}

	public static Cuisine newCustomerProxy() {
		return newCuisineProxy( null );
	}

	public static Cuisine newCuisineProxy(Serializable id) {
		return ( Cuisine ) Proxy.newProxyInstance(
				Cuisine.class.getClassLoader(),
		        new Class[] {Cuisine.class},
		        new DataProxyHandler( Cuisine.class.getName(), id )
		);
	}

	public static String extractEntityName(Object object) {
		// Our custom java.lang.reflect.Proxy instances actually bundle
		// their appropriate entity name, so we simply extract it from there
		// if this represents one of our proxies; otherwise, we return null
		if ( Proxy.isProxyClass( object.getClass() ) ) {
			InvocationHandler handler = Proxy.getInvocationHandler( object );
			if ( DataProxyHandler.class.isAssignableFrom( handler.getClass() ) ) {
				DataProxyHandler myHandler = ( DataProxyHandler ) handler;
				return myHandler.getEntityName();
			}
		}
		return null;
	}
}