/*
*
* 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.
*
*/
package org.apache.qpid.qmf;
import org.apache.qpid.transport.codec.BBDecoder;
import java.nio.ByteBuffer;
public class QMFCommandDecoder
{
private BBDecoder _decoder;
private static final QMFOperation[] OP_CODES = new QMFOperation[256];
private final QMFService _qmfService;
static
{
for(QMFOperation op : QMFOperation.values())
{
OP_CODES[op.getOpcode()] = op;
}
}
public QMFCommandDecoder(final QMFService qmfService, ByteBuffer buf)
{
_qmfService = qmfService;
_decoder = new BBDecoder();
_decoder.init(buf);
}
public QMFCommand decode()
{
if(_decoder.hasRemaining())
{
QMFCommandHeader header = readQMFHeader();
switch(header.getOperation())
{
case BROKER_REQUEST:
return new QMFBrokerRequestCommand(header, _decoder);
case PACKAGE_QUERY:
return new QMFPackageQueryCommand(header, _decoder);
case CLASS_QUERY:
return new QMFClassQueryCommand(header, _decoder);
case SCHEMA_REQUEST:
return new QMFSchemaRequestCommand(header, _decoder);
case METHOD_REQUEST:
return new QMFMethodRequestCommand(header, _decoder, _qmfService);
case GET_QUERY:
return new QMFGetQueryCommand(header, _decoder);
default:
System.out.println("Unknown command");
}
return null;
}
else
{
return null;
}
}
private QMFCommandHeader readQMFHeader()
{
if(_decoder.readInt8() == (byte) 'A'
&& _decoder.readInt8() == (byte) 'M')
{
byte version = _decoder.readInt8();
short opCode = _decoder.readUint8();
int seq = _decoder.readInt32();
return new QMFCommandHeader(version, seq, OP_CODES[opCode]);
}
return null;
}
}