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Hibernate example source code file (SerializableNClobProxy.java)

This example Hibernate source code file (SerializableNClobProxy.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, classloader, classnotfoundexception, clob, jdbc, nclob_class, nclob_class, proxy_interfaces, proxy_interfaces, reflection, serializableclobproxy, serializablenclobproxy, serializablenclobproxy, sql

The Hibernate SerializableNClobProxy.java source code

/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * Copyright (c) 2009 by Red Hat Inc and/or its affiliates or by
 * third-party contributors as indicated by either @author tags or express
 * copyright attribution statements applied by the authors.  All
 * third-party contributions are distributed under license by Red Hat Inc.
 *
 * This copyrighted material is made available to anyone wishing to use, modify,
 * copy, or redistribute it subject to the terms and conditions of the GNU
 * Lesser General Public License, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
 * for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this distribution; if not, write to:
 * Free Software Foundation, Inc.
 * 51 Franklin Street, Fifth Floor
 * Boston, MA  02110-1301  USA
 */
package org.hibernate.engine.jdbc;
import java.lang.reflect.Proxy;
import java.sql.Clob;

/**
 * Manages aspects of proxying java.sql.NClobs to add serializability.
 *
 * @author Steve Ebersole
 */
public class SerializableNClobProxy extends SerializableClobProxy {
	private static final Class NCLOB_CLASS = loadNClobClassIfAvailable();

	private static Class loadNClobClassIfAvailable() {
		try {
			return getProxyClassLoader().loadClass( "java.sql.NClob" );
		}
		catch ( ClassNotFoundException e ) {
			return null;
		}
	}

	private static final Class[] PROXY_INTERFACES = new Class[] { determineNClobInterface(), WrappedClob.class };

	private static Class determineNClobInterface() {
		// java.sql.NClob is a simple marker interface extending java.sql.Clob.  So if java.sql.NClob is not available
		// on the classloader, just use java.sql.Clob
		return NCLOB_CLASS == null ? Clob.class : NCLOB_CLASS;
	}

	public static boolean isNClob(Clob clob) {
		return NCLOB_CLASS != null && NCLOB_CLASS.isInstance( clob );
	}

	/**
	 * Builds a serializable {@link java.sql.Clob} wrapper around the given {@link java.sql.Clob}.
	 *
	 * @param clob The {@link java.sql.Clob} to be wrapped.
	 *
	 * @see #generateProxy(java.sql.Clob)
	 */
	protected SerializableNClobProxy(Clob clob) {
		super( clob );
	}

	/**
	 * Generates a SerializableClobProxy proxy wrapping the provided Clob object.
	 *
	 * @param clob The Clob to wrap.
	 * @return The generated proxy.
	 */
	public static Clob generateProxy(Clob clob) {
		return ( Clob ) Proxy.newProxyInstance(
				getProxyClassLoader(),
				PROXY_INTERFACES,
				new SerializableNClobProxy( clob )
		);
	}

	/**
	 * Determines the appropriate class loader to which the generated proxy
	 * should be scoped.
	 *
	 * @return The class loader appropriate for proxy construction.
	 */
	public static ClassLoader getProxyClassLoader() {
		return SerializableClobProxy.getProxyClassLoader();
	}
}

Other Hibernate examples (source code examples)

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