/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
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 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
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 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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/*
 * $Header: /cvs/glassfish/admin-cli/cli-api/src/java/com/sun/cli/jmx/util/MBeanServerConnection_Pattern.java,v 1.4 2007/05/05 05:25:00 tcfujii Exp $
 * $Revision: 1.4 $
 * $Date: 2007/05/05 05:25:00 $
 */
package com.sun.cli.jmx.util;

import javax.management.*;
import java.io.IOException;
import java.util.Set;



/*
	This class allows use of MBeanServerConnection methods with ObjectName patterns
	that resolve to a single MBean.  This is useful to avoid hard-coupling to specific
	ObjectNames; instead an ObjectName pattern may be used which resolves to a 
	single MBean.
	
	For example, if you know the 'name' property is unique (at least for your MBean),
	you could use the ObjectName "*:name=myname,*" instead of a possibly much longer
	and complicated name (which potentially could change each time the MBean is registered).
 */
public class MBeanServerConnection_Pattern extends MBeanServerConnection_Hook
{
	final MBeanServerConnection_Hook.Hook	mHook;
	
		public
	MBeanServerConnection_Pattern( MBeanServerConnection impl )
	{
		super( impl );
		
		mHook	= new NameResolverHook();
	}
	
		Hook
	getHook()
	{
		return( mHook );
	}
	
	/*
		Hook which resolves a name pattern to a single name
	*/
	class NameResolverHook extends MBeanServerConnection_Hook.HookImpl
	{
			public
		NameResolverHook(   )
		{
		}
		
			public ObjectName
		nameHook( long id, ObjectName name )
			throws java.io.IOException
		{
			try
			{
				ObjectName	newName	= resolve( name );
				
				return( newName );
			}
			catch( InstanceNotFoundException e )
			{
				// we can't let InstanceNotFoundException propogate because
				// the MBeanServerConnection interface does not declare it as a legal
				// exception for some of the calls the nameHook() is called in.
				throw new IllegalArgumentException();
			}
		}
	}

	
		public ObjectName
	resolve( ObjectName input )
		throws java.io.IOException, InstanceNotFoundException
	{
		ObjectName	resolvedName	= input;
		
		if ( input.isPattern() )
		{
			final Set	resolvedNames	= getConn().queryNames( input, null );
			final int	numNames	= resolvedNames.size();
			
			if ( numNames == 1 )
			{
				resolvedName	= (ObjectName)resolvedNames.iterator().next();
			}
			else if ( numNames == 2 )
			{
				throw new InstanceNotFoundException( input.toString() );
			}
			else
			{
				throw new InstanceNotFoundException( input.toString() );
			}
		}
		return( resolvedName );
	}
	


};

