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Java Source Code / Java Documentation » Net » mina 2.0.0 M1 » org.apache.mina.filter.codec.demux

Source Cross Reference Class Diagram Java Document (Java Doc)

org.apache.mina.filter.codec.demux .MessageDecoder

All known Subclasses:   org.apache.mina.example.sumup.codec .AbstractMessageDecoder,  org.apache.mina.filter.codec.demux .MessageDecoderAdapter,
MessageDecoder
public interface MessageDecoder (Code)
Decodes a certain type of messages.
We didn't provide any dispose method for MessageDecoder because it can give you performance penalty in case you have a lot of message types to handle.
author:
   The Apache MINA Project (dev@mina.apache.org)
version:
   $Rev: 590006 $, $Date: 2007-10-30 03:44:02 -0600 (Tue, 30 Oct 2007) $
See Also:   DemuxingProtocolDecoder
See Also:   MessageDecoderFactory

Field Summary
static MessageDecoderResult NEED_DATA
     Represents a result from MessageDecoder.decodable(IoSession,IoBuffer) and MessageDecoder.decode(IoSession,IoBuffer,ProtocolDecoderOutput) .
static MessageDecoderResult NOT_OK
     Represents a result from MessageDecoder.decodable(IoSession,IoBuffer) and MessageDecoder.decode(IoSession,IoBuffer,ProtocolDecoderOutput) .
static MessageDecoderResult OK
     Represents a result from MessageDecoder.decodable(IoSession,IoBuffer) and MessageDecoder.decode(IoSession,IoBuffer,ProtocolDecoderOutput) .

Method Summary
MessageDecoderResult decodable(IoSession session, IoBuffer in)
     Checks the specified buffer is decodable by this decoder.
MessageDecoderResult decode(IoSession session, IoBuffer in, ProtocolDecoderOutput out)
     Decodes binary or protocol-specific content into higher-level message objects.
void finishDecode(IoSession session, ProtocolDecoderOutput out)
     Invoked when the specified session is closed while this decoder was parsing the data.

Field Detail
NEED_DATA
static MessageDecoderResult NEED_DATA(Code)
Represents a result from MessageDecoder.decodable(IoSession,IoBuffer) and MessageDecoder.decode(IoSession,IoBuffer,ProtocolDecoderOutput) . Please refer to each method's documentation for detailed explanation.

NOT_OK
static MessageDecoderResult NOT_OK(Code)
Represents a result from MessageDecoder.decodable(IoSession,IoBuffer) and MessageDecoder.decode(IoSession,IoBuffer,ProtocolDecoderOutput) . Please refer to each method's documentation for detailed explanation.

OK
static MessageDecoderResult OK(Code)
Represents a result from MessageDecoder.decodable(IoSession,IoBuffer) and MessageDecoder.decode(IoSession,IoBuffer,ProtocolDecoderOutput) . Please refer to each method's documentation for detailed explanation.

Method Detail
decodable
MessageDecoderResult decodable(IoSession session, IoBuffer in)(Code)
Checks the specified buffer is decodable by this decoder. MessageDecoder.OK if this decoder can decode the specified buffer.MessageDecoder.NOT_OK if this decoder cannot decode the specified buffer.MessageDecoder.NEED_DATA if more data is required to determine if thespecified buffer is decodable (MessageDecoder.OK) or not decodableMessageDecoder.NOT_OK.

decode
MessageDecoderResult decode(IoSession session, IoBuffer in, ProtocolDecoderOutput out) throws Exception(Code)
Decodes binary or protocol-specific content into higher-level message objects. MINA invokes MessageDecoder.decode(IoSession,IoBuffer,ProtocolDecoderOutput) method with read data, and then the decoder implementation puts decoded messages into ProtocolDecoderOutput . MessageDecoder.OK if you finished decoding messages successfully.MessageDecoder.NEED_DATA if you need more data to finish decoding current message.MessageDecoder.NOT_OK if you cannot decode current message due to protocol specification violation.
throws:
  Exception - if the read data violated protocol specification

finishDecode
void finishDecode(IoSession session, ProtocolDecoderOutput out) throws Exception(Code)
Invoked when the specified session is closed while this decoder was parsing the data. This method is useful when you deal with the protocol which doesn't specify the length of a message such as HTTP response without content-length header. Implement this method to process the remaining data that MessageDecoder.decode(IoSession,IoBuffer,ProtocolDecoderOutput) method didn't process completely.
throws:
  Exception - if the read data violated protocol specification

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