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/*
*
* 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.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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