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

address, class, class, company, customer, customer, dataproxyhandler, dataproxyhandler, invocationhandler, io, person, person, proxyhelper, reflection, string

The Hibernate ProxyHelper.java source code

package org.hibernate.test.dynamicentity;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

/**
 * @author <a href="mailto:steve@hibernate.org">Steve Ebersole 
 */
public class ProxyHelper {

	public static Person newPersonProxy() {
		return newPersonProxy( null );
	}

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

	public static Customer newCustomerProxy() {
		return newCustomerProxy( null );
	}

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

	public static Company newCompanyProxy() {
		return newCompanyProxy( null );
	}

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

	public static Address newAddressProxy() {
		return newAddressProxy( null );
	}

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