org.hibernate.engine.jdbc.NClobProxy Maven / Gradle / Ivy
/*
* 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.sql.Clob;
import java.io.Reader;
import java.lang.reflect.Proxy;
/**
* Manages aspects of proxying java.sql.NClobs for non-contextual creation, including proxy creation and
* handling proxy invocations.
*
* Generated proxies are typed as {@link java.sql.Clob} (java.sql.NClob extends {@link java.sql.Clob}) and in JDK 1.6 environments, they
* are also typed to java.sql.NClob
*
* @author Steve Ebersole
*/
public class NClobProxy extends ClobProxy {
public static final Class[] PROXY_INTERFACES = new Class[] { determineNClobInterface(), NClobImplementer.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
try {
return getProxyClassLoader().loadClass( "java.sql.NClob" );
}
catch ( ClassNotFoundException e ) {
return Clob.class;
}
}
protected NClobProxy(String string) {
super( string );
}
protected NClobProxy(Reader reader, long length) {
super( reader, length );
}
/**
* Generates a {@link java.sql.Clob} proxy using the string data.
*
* @param string The data to be wrapped as a {@link java.sql.Clob}.
*
* @return The generated proxy.
*/
public static Clob generateProxy(String string) {
return ( Clob ) Proxy.newProxyInstance(
getProxyClassLoader(),
PROXY_INTERFACES,
new ClobProxy( string )
);
}
/**
* Generates a {@link Clob} proxy using a character reader of given length.
*
* @param reader The character reader
* @param length The length of the character reader
*
* @return The generated proxy.
*/
public static Clob generateProxy(Reader reader, long length) {
return ( Clob ) Proxy.newProxyInstance(
getProxyClassLoader(),
PROXY_INTERFACES,
new ClobProxy( reader, length )
);
}
/**
* Determines the appropriate class loader to which the generated proxy
* should be scoped.
*
* @return The class loader appropriate for proxy construction.
*/
protected static ClassLoader getProxyClassLoader() {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if ( cl == null ) {
cl = NClobImplementer.class.getClassLoader();
}
return cl;
}
}