/*
*
* 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.amqp_1_0.framing;
import org.apache.qpid.amqp_1_0.codec.ProtocolHandler;
import org.apache.qpid.amqp_1_0.transport.ConnectionEndpoint;
import java.nio.ByteBuffer;
public class AMQPProtocolHeaderHandler implements ProtocolHandler
{
private ConnectionEndpoint _connection;
private static final byte MAJOR_VERSION = (byte) 1;
private static final byte MINOR_VERSION = (byte) 0;
enum State {
AWAITING_MAJOR,
AWAITING_MINOR,
AWAITING_REVISION,
ERROR
}
private State _state = State.AWAITING_MAJOR;
public AMQPProtocolHeaderHandler(final ConnectionEndpoint connection)
{
_connection = connection;
}
public ProtocolHandler parse(final ByteBuffer in)
{
while(in.hasRemaining() && _state != State.ERROR)
{
switch(_state)
{
case AWAITING_MAJOR:
_state = in.get() == MAJOR_VERSION ? State.AWAITING_MINOR : State.ERROR;
if(!in.hasRemaining())
{
break;
}
case AWAITING_MINOR:
_state = in.get() == MINOR_VERSION ? State.AWAITING_MINOR : State.ERROR;
if(!in.hasRemaining())
{
break;
}
case AWAITING_REVISION:
byte revision = in.get();
_connection.protocolHeaderReceived(MAJOR_VERSION, MINOR_VERSION, revision);
ProtocolHandler handler = new FrameHandler(_connection);
return handler.parse(in);
}
}
if(_state == State.ERROR)
{
_connection.invalidHeaderReceived();
}
return this;
}
public boolean isDone()
{
return _state != State.ERROR && !_connection.closedForInput();
}
}