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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.framing;
import org.apache.mina.common.ByteBuffer;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
import org.apache.qpid.AMQException;
public class ProtocolInitiation extends AMQDataBlock implements EncodableAMQDataBlock
{
public char[] header = new char[]{'A','M','Q','P'};
// TODO: generate these constants automatically from the xml protocol spec file
private static byte CURRENT_PROTOCOL_CLASS = 1;
private static final int CURRENT_PROTOCOL_INSTANCE = 1;
public byte protocolClass = CURRENT_PROTOCOL_CLASS;
public byte protocolInstance = CURRENT_PROTOCOL_INSTANCE;
public byte protocolMajor;
public byte protocolMinor;
// public ProtocolInitiation() {}
public ProtocolInitiation(byte major, byte minor)
{
protocolMajor = major;
protocolMinor = minor;
}
public long getSize()
{
return 4 + 1 + 1 + 1 + 1;
}
public void writePayload(ByteBuffer buffer)
{
for (int i = 0; i < header.length; i++)
{
buffer.put((byte) header[i]);
}
buffer.put(protocolClass);
buffer.put(protocolInstance);
buffer.put(protocolMajor);
buffer.put(protocolMinor);
}
public void populateFromBuffer(ByteBuffer buffer) throws AMQException
{
throw new AMQException("Method not implemented");
}
public boolean equals(Object o)
{
if (!(o instanceof ProtocolInitiation))
{
return false;
}
ProtocolInitiation pi = (ProtocolInitiation) o;
if (pi.header == null)
{
return false;
}
if (header.length != pi.header.length)
{
return false;
}
for (int i = 0; i < header.length; i++)
{
if (header[i] != pi.header[i])
{
return false;
}
}
return (protocolClass == pi.protocolClass &&
protocolInstance == pi.protocolInstance &&
protocolMajor == pi.protocolMajor &&
protocolMinor == pi.protocolMinor);
}
public static class Decoder //implements MessageDecoder
{
/**
*
* @param session
* @param in
* @return true if we have enough data to decode the PI frame fully, false if more
* data is required
*/
public boolean decodable(IoSession session, ByteBuffer in)
{
return (in.remaining() >= 8);
}
public void decode(IoSession session, ByteBuffer in, ProtocolDecoderOutput out)
throws Exception
{
byte[] theHeader = new byte[4];
in.get(theHeader);
ProtocolInitiation pi = new ProtocolInitiation((byte)0, (byte)0);
pi.header = new char[]{(char) theHeader[0],(char) theHeader[CURRENT_PROTOCOL_INSTANCE],(char) theHeader[2], (char) theHeader[3]};
String stringHeader = new String(pi.header);
if (!"AMQP".equals(stringHeader))
{
throw new AMQProtocolHeaderException("Invalid protocol header - read " + stringHeader);
}
pi.protocolClass = in.get();
pi.protocolInstance = in.get();
pi.protocolMajor = in.get();
pi.protocolMinor = in.get();
out.write(pi);
}
}
public void checkVersion(ProtocolVersionList pvl) throws AMQException
{
if (protocolClass != CURRENT_PROTOCOL_CLASS)
{
throw new AMQProtocolClassException("Protocol class " + CURRENT_PROTOCOL_CLASS + " was expected; received " +
protocolClass);
}
if (protocolInstance != CURRENT_PROTOCOL_INSTANCE)
{
throw new AMQProtocolInstanceException("Protocol instance " + CURRENT_PROTOCOL_INSTANCE + " was expected; received " +
protocolInstance);
}
/*
if (protocolMajor != CURRENT_PROTOCOL_VERSION_MAJOR)
{
throw new AMQProtocolVersionException("Protocol major version " + CURRENT_PROTOCOL_VERSION_MAJOR +
" was expected; received " + protocolMajor);
}
if (protocolMinor != CURRENT_PROTOCOL_VERSION_MINOR)
{
throw new AMQProtocolVersionException("Protocol minor version " + CURRENT_PROTOCOL_VERSION_MINOR +
" was expected; received " + protocolMinor);
}
*/
/* Look through list of available protocol versions */
boolean found = false;
for (int i=0; i<pvl.pv.length; i++)
{
if (pvl.pv[i][pvl.PROTOCOL_MAJOR] == protocolMajor &&
pvl.pv[i][pvl.PROTOCOL_MINOR] == protocolMinor)
{
found = true;
}
}
if (!found)
{
// TODO: add list of available versions in list to msg...
throw new AMQProtocolVersionException("Protocol version " +
protocolMajor + "." + protocolMinor + " not found in protocol version list.");
}
}
}
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