&{MainRegistry.java}
/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */

/*
 * This file is auto-generated by ${GENERATOR} - do not modify.
 * Supported AMQP versions:
%{VLIST} *   ${major}-${minor}
 */
 
package org.apache.qpid.framing;

import java.util.HashMap;
import java.lang.reflect.Constructor;
import org.apache.log4j.Logger;

class MainRegistry
{
    private static final Logger _log = Logger.getLogger(MainRegistry.class);
	private static HashMap<Long, Class> classIDMethodIDVersionBodyMap = new HashMap<Long, Class>();
	
    static
    {
%{CLIST}	${reg_map_put_method}
    }
    
    public static AMQMethodBody get(short classID, short methodID, byte major, byte minor)
        throws AMQFrameDecodingException
    {
		Class bodyClass = classIDMethodIDVersionBodyMap.get(
		    createMapKey(classID, methodID, major, minor));
		if (bodyClass == null)
		{
	    	throw new AMQFrameDecodingException(_log,
	    	    "Unable to find a suitable decoder for class " + classID + " and method " +
	    	    methodID + " in AMQP version " + major + "-" + minor + ".");
	    }
	    try
	    {
	    	Constructor initFn = bodyClass.getConstructor(byte.class, byte.class);
	        return (AMQMethodBody) initFn.newInstance(major, minor);
	    }
	    catch (Exception e)
	    {
	    	throw new AMQFrameDecodingException(_log,
	    	    "Unable to instantiate body class for class " + classID + " and method " +
	    	    methodID + " in AMQP version " + major + "-" + minor + " : " + e, e);
	    }
    }
    
    private static Long createMapKey(short classID, short methodID, byte major, byte minor)
    {
    	/**
         *	Mapping of 4 components into a guaranteed unique key:
         *  MSB                                     LSB
         *  +----+----+----+----+----+----+-----+-----+
         *  |    0    | classID |methodID |major|minor|
         *  +----+----+----+----+----+----+-----+-----+
         */
    	return new Long(((long)classID << 32) + ((long)methodID << 16) + ((long)major << 8) + minor);
    }
}