Hibernate example source code file (ProxyInterceptor.java)

This example Hibernate source code file (ProxyInterceptor.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

emptyinterceptor, entitymode, entitymode, io, object, object, proxyinterceptor, reflection, serializable, serializable, string, string

The Hibernate ProxyInterceptor.java source code

package org.hibernate.test.dynamicentity.interceptor;
import java.io.Serializable;
import java.lang.reflect.Proxy;
import org.hibernate.EmptyInterceptor;
import org.hibernate.EntityMode;
import org.hibernate.test.dynamicentity.Company;
import org.hibernate.test.dynamicentity.Customer;
import org.hibernate.test.dynamicentity.ProxyHelper;

/**
 * Our custom {@link org.hibernate.Interceptor} impl which performs the
 * interpretation of entity-name -> proxy instance and vice-versa.
 *
 * @author <a href="mailto:steve@hibernate.org">Steve Ebersole 
 */
public class ProxyInterceptor extends EmptyInterceptor {

	/**
	 * The callback from Hibernate to determine the entity name given
	 * a presumed entity instance.
	 *
	 * @param object The presumed entity instance.
	 * @return The entity name (pointing to the proper entity mapping).
	 */
	public String getEntityName(Object object) {
		String entityName = ProxyHelper.extractEntityName( object );
		if ( entityName == null ) {
			entityName = super.getEntityName( object );
		}
		return entityName;
	}

	/**
	 * The callback from Hibernate in order to build an instance of the
	 * entity represented by the given entity name.  Here, we build a
	 * {@link Proxy} representing the entity.
	 *
	 * @param entityName The entity name for which to create an instance.  In our setup,
	 * this is the interface name.
	 * @param entityMode The entity mode in which to create an instance.  Here, we are only
	 * interestes in custom behavior for the POJO entity mode.
	 * @param id The identifier value for the given entity.
	 * @return The instantiated instance.
	 */
	public Object instantiate(String entityName, EntityMode entityMode, Serializable id) {
		if ( entityMode == EntityMode.POJO ) {
			if ( Customer.class.getName().equals( entityName ) ) {
				return ProxyHelper.newCustomerProxy( id );
			}
			else if ( Company.class.getName().equals( entityName ) ) {
				return ProxyHelper.newCompanyProxy( id );
			}
		}
		return super.instantiate( entityName, entityMode, id );
	}

}