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/*
*
* Copyright (c) 2006 The Apache Software Foundation
*
* Licensed 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.codec;
import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.CumulativeProtocolDecoder;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
import org.apache.qpid.framing.AMQDataBlockDecoder;
import org.apache.qpid.framing.ProtocolInitiation;
/**
* There is one instance of this class per session. Any changes or configuration done
* at run time to the encoders or decoders only affects decoding/encoding of the
* protocol session data to which is it bound.
*
*/
public class AMQDecoder extends CumulativeProtocolDecoder
{
private AMQDataBlockDecoder _dataBlockDecoder = new AMQDataBlockDecoder();
private ProtocolInitiation.Decoder _piDecoder = new ProtocolInitiation.Decoder();
private boolean _expectProtocolInitiation;
public AMQDecoder(boolean expectProtocolInitiation)
{
_expectProtocolInitiation = expectProtocolInitiation;
}
protected boolean doDecode(IoSession session, ByteBuffer in, ProtocolDecoderOutput out) throws Exception
{
if (_expectProtocolInitiation)
{
return doDecodePI(session, in, out);
}
else
{
return doDecodeDataBlock(session, in, out);
}
}
protected boolean doDecodeDataBlock(IoSession session, ByteBuffer in, ProtocolDecoderOutput out) throws Exception
{
int pos = in.position();
boolean enoughData = _dataBlockDecoder.decodable(session, in);
in.position(pos);
if (!enoughData)
{
// returning false means it will leave the contents in the buffer and
// call us again when more data has been read
return false;
}
else
{
_dataBlockDecoder.decode(session, in, out);
return true;
}
}
private boolean doDecodePI(IoSession session, ByteBuffer in, ProtocolDecoderOutput out) throws Exception
{
boolean enoughData = _piDecoder.decodable(session, in);
if (!enoughData)
{
// returning false means it will leave the contents in the buffer and
// call us again when more data has been read
return false;
}
else
{
_piDecoder.decode(session, in, out);
return true;
}
}
public void setExpectProtocolInitiation(boolean expectProtocolInitiation)
{
_expectProtocolInitiation = expectProtocolInitiation;
}
}
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