/* * Distributed as part of c3p0 v.0.9.1-pre6 * * Copyright (C) 2005 Machinery For Change, Inc. * * Author: Steve Waldman <swaldman@mchange.com> * * This library is free software; you can redistribute it and/or modify * it under the terms of the GNU Lesser General Public License version 2.1, as  * published by the Free Software Foundation. * * This software 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 software; see the file LICENSE.  If not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. */package com.mchange.v2.c3p0;import java.beans.PropertyChangeEvent;import java.beans.PropertyChangeListener;import java.beans.VetoableChangeListener;import java.beans.PropertyVetoException;import java.io.PrintWriter;import java.sql.Connection;import java.sql.SQLException;import java.util.Hashtable;import javax.naming.Name;import javax.naming.NamingException;import javax.naming.InitialContext;import javax.sql.DataSource;import com.mchange.v2.log.MLevel;import com.mchange.v2.log.MLog;import com.mchange.v2.log.MLogger;import com.mchange.v2.sql.SqlUtils;import com.mchange.v2.c3p0.impl.JndiRefDataSourceBase;final class JndiRefForwardingDataSource extends JndiRefDataSourceBase implements DataSource{    final static MLogger logger = MLog.getLogger( JndiRefForwardingDataSource.class );    {	VetoableChangeListener l = new VetoableChangeListener()	    {		public void vetoableChange( PropertyChangeEvent evt ) throws PropertyVetoException		{		    Object val = evt.getNewValue();		    if ( "jndiName".equals( evt.getPropertyName() ) )			{			    if (! (val instanceof Name || val instanceof String) )				throw new PropertyVetoException("jndiName must be a String or a javax.naming.Name", evt);			}		}	    };	this.addVetoableChangeListener( l );	PropertyChangeListener pcl = new PropertyChangeListener()	    {		public void propertyChange( PropertyChangeEvent evt )		{ cachedInner = null; }	    };	this.addPropertyChangeListener( pcl );	C3P0Registry.register( this );    }    //MT: protected by this' lock in all cases    transient DataSource cachedInner;    //MT: called only from inner(), effectively synchrtonized    private DataSource dereference() throws SQLException    {	Object jndiName = this.getJndiName();	Hashtable jndiEnv = this.getJndiEnv();	try	    {		InitialContext ctx;		if (jndiEnv != null)		    ctx = new InitialContext( jndiEnv );		else		    ctx = new InitialContext();		if (jndiName instanceof String)		    return (DataSource) ctx.lookup( (String) jndiName );		else if (jndiName instanceof Name)		    return (DataSource) ctx.lookup( (Name) jndiName );		else		    throw new SQLException("Could not find ConnectionPoolDataSource with " +					   "JNDI name: " + jndiName);	    }	catch( NamingException e )	    {		//e.printStackTrace();		if ( logger.isLoggable( MLevel.WARNING ) )		    logger.log( MLevel.WARNING, "An Exception occurred while trying to look up a target DataSource via JNDI!", e );		throw SqlUtils.toSQLException( e ); 	    }    }    private synchronized DataSource inner() throws SQLException    {	if (cachedInner != null)	    return cachedInner;	else	    {		DataSource out = dereference();		if (this.isCaching())		    cachedInner = out;		return out;	    }    }    public Connection getConnection() throws SQLException    { return inner().getConnection(); }    public Connection getConnection(String username, String password) throws SQLException    { return inner().getConnection( username, password );  }    public PrintWriter getLogWriter() throws SQLException    { return inner().getLogWriter(); }    public void setLogWriter(PrintWriter out) throws SQLException    { inner().setLogWriter( out ); }    public int getLoginTimeout() throws SQLException    { return inner().getLoginTimeout(); }    public void setLoginTimeout(int seconds) throws SQLException    { inner().setLoginTimeout( seconds ); }}