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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.qpid.AMQException;
import org.apache.qpid.codec.MarkableDataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.util.Arrays;
public class ProtocolInitiation extends AMQDataBlock implements EncodableAMQDataBlock
{
// TODO: generate these constants automatically from the xml protocol spec file
private static final byte[] AMQP_HEADER = new byte[]{(byte)'A',(byte)'M',(byte)'Q',(byte)'P'};
private static final byte CURRENT_PROTOCOL_CLASS = 1;
private static final byte TCP_PROTOCOL_INSTANCE = 1;
private final byte[] _protocolHeader;
private final byte _protocolClass;
private final byte _protocolInstance;
private final byte _protocolMajor;
private final byte _protocolMinor;
public ProtocolInitiation(byte[] protocolHeader, byte protocolClass, byte protocolInstance, byte protocolMajor, byte protocolMinor)
{
_protocolHeader = protocolHeader;
_protocolClass = protocolClass;
_protocolInstance = protocolInstance;
_protocolMajor = protocolMajor;
_protocolMinor = protocolMinor;
}
public ProtocolInitiation(ProtocolVersion pv)
{
this(AMQP_HEADER,
pv.equals(ProtocolVersion.v0_91) ? 0 : CURRENT_PROTOCOL_CLASS,
pv.equals(ProtocolVersion.v0_91) ? 0 : TCP_PROTOCOL_INSTANCE,
pv.equals(ProtocolVersion.v0_91) ? 9 : pv.getMajorVersion(),
pv.equals(ProtocolVersion.v0_91) ? 1 : pv.getMinorVersion());
}
public ProtocolInitiation(MarkableDataInput in) throws IOException
{
_protocolHeader = new byte[4];
in.read(_protocolHeader);
_protocolClass = in.readByte();
_protocolInstance = in.readByte();
_protocolMajor = in.readByte();
_protocolMinor = in.readByte();
}
public long getSize()
{
return 4 + 1 + 1 + 1 + 1;
}
public void writePayload(DataOutput buffer) throws IOException
{
buffer.write(_protocolHeader);
buffer.write(_protocolClass);
buffer.write(_protocolInstance);
buffer.write(_protocolMajor);
buffer.write(_protocolMinor);
}
public boolean equals(Object o)
{
if (!(o instanceof ProtocolInitiation))
{
return false;
}
ProtocolInitiation pi = (ProtocolInitiation) o;
if (pi._protocolHeader == null)
{
return false;
}
if (_protocolHeader.length != pi._protocolHeader.length)
{
return false;
}
for (int i = 0; i < _protocolHeader.length; i++)
{
if (_protocolHeader[i] != pi._protocolHeader[i])
{
return false;
}
}
return (_protocolClass == pi._protocolClass &&
_protocolInstance == pi._protocolInstance &&
_protocolMajor == pi._protocolMajor &&
_protocolMinor == pi._protocolMinor);
}
@Override
public int hashCode()
{
int result = _protocolHeader != null ? Arrays.hashCode(_protocolHeader) : 0;
result = 31 * result + (int) _protocolClass;
result = 31 * result + (int) _protocolInstance;
result = 31 * result + (int) _protocolMajor;
result = 31 * result + (int) _protocolMinor;
return result;
}
public static class Decoder //implements MessageDecoder
{
/**
*
* @param in input buffer
* @return true if we have enough data to decode the PI frame fully, false if more
* data is required
*/
public boolean decodable(MarkableDataInput in) throws IOException
{
return (in.available() >= 8);
}
}
public ProtocolVersion checkVersion() throws AMQException
{
if(_protocolHeader.length != 4)
{
throw new AMQProtocolHeaderException("Protocol header should have exactly four octets", null);
}
for(int i = 0; i < 4; i++)
{
if(_protocolHeader[i] != AMQP_HEADER[i])
{
try
{
throw new AMQProtocolHeaderException("Protocol header is not correct: Got " + new String(_protocolHeader,"ISO-8859-1") + " should be: " + new String(AMQP_HEADER, "ISO-8859-1"), null);
}
catch (UnsupportedEncodingException e)
{
}
}
}
ProtocolVersion pv;
// Hack for 0-9-1 which changed how the header was defined
if(_protocolInstance == 0 && _protocolMajor == 9 && _protocolMinor == 1)
{
pv = ProtocolVersion.v0_91;
if (_protocolClass != 0)
{
throw new AMQProtocolClassException("Protocol class " + 0 + " was expected; received " +
_protocolClass, null);
}
}
else if (_protocolClass != CURRENT_PROTOCOL_CLASS)
{
throw new AMQProtocolClassException("Protocol class " + CURRENT_PROTOCOL_CLASS + " was expected; received " +
_protocolClass, null);
}
else if (_protocolInstance != TCP_PROTOCOL_INSTANCE)
{
throw new AMQProtocolInstanceException("Protocol instance " + TCP_PROTOCOL_INSTANCE + " was expected; received " +
_protocolInstance, null);
}
else
{
pv = new ProtocolVersion(_protocolMajor, _protocolMinor);
}
if (!pv.isSupported())
{
// TODO: add list of available versions in list to msg...
throw new AMQProtocolVersionException("Protocol version " +
_protocolMajor + "." + _protocolMinor + " not suppoerted by this version of the Qpid broker.", null);
}
return pv;
}
public byte getProtocolClass()
{
return _protocolClass;
}
public byte getProtocolInstance()
{
return _protocolInstance;
}
public byte getProtocolMajor()
{
return _protocolMajor;
}
public byte getProtocolMinor()
{
return _protocolMinor;
}
public String toString()
{
StringBuffer buffer = new StringBuffer(new String(_protocolHeader));
buffer.append(Integer.toHexString(_protocolClass));
buffer.append(Integer.toHexString(_protocolInstance));
buffer.append(Integer.toHexString(_protocolMajor));
buffer.append(Integer.toHexString(_protocolMinor));
return buffer.toString();
}
}
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