public class XmlFrameDecoder extends ByteToMessageDecoder
+-----+-----+-----------+ | <an | Xml | Element/> | +-----+-----+-----------+this decoder would output a single frame:
+-----------------+ | <anXmlElement/> | +-----------------+Given an input array of bytes split over 5 frames like this:
+-----+-----+-----------+-----+----------------------------------+ | <an | Xml | Element/> | <ro | ot><child>content</child></root> | +-----+-----+-----------+-----+----------------------------------+this decoder would output two frames:
+-----------------+-------------------------------------+ | <anXmlElement/> | <root><child>content</child></root> | +-----------------+-------------------------------------+The byte stream is expected to be in UTF-8 character encoding or ASCII. The current implementation uses direct
byte to char cast and then compares that char to a few low range
ASCII characters like '<', '>' or '/'. UTF-8 is not using low range [0..0x7F]
byte values for multibyte codepoint representations therefore fully supported by this implementation.
Please note that this decoder is not suitable for
xml streaming protocols such as
XMPP,
where an initial xml element opens the stream and only
gets closed at the end of the session, although this class
could probably allow for such type of message flow with
minor modifications.ByteToMessageDecoder.CumulatorCOMPOSITE_CUMULATOR, MERGE_CUMULATOR| Constructor and Description |
|---|
XmlFrameDecoder(int maxFrameLength) |
| Modifier and Type | Method and Description |
|---|---|
protected void |
decode(io.netty.channel.ChannelHandlerContext ctx,
io.netty.buffer.ByteBuf in,
List<Object> out)
Decode the from one
ByteBuf to an other. |
actualReadableBytes, callDecode, channelInactive, channelRead, channelReadComplete, decodeLast, discardSomeReadBytes, handlerRemoved, handlerRemoved0, internalBuffer, isSingleDecode, setCumulator, setDiscardAfterReads, setSingleDecode, userEventTriggeredchannelActive, channelRegistered, channelUnregistered, channelWritabilityChanged, exceptionCaughtensureNotSharable, handlerAdded, isSharableprotected void decode(io.netty.channel.ChannelHandlerContext ctx,
io.netty.buffer.ByteBuf in,
List<Object> out)
throws Exception
ByteToMessageDecoderByteBuf to an other. This method will be called till either the input
ByteBuf has nothing to read when return from this method or till nothing was read from the input
ByteBuf.decode in class ByteToMessageDecoderctx - the ChannelHandlerContext which this ByteToMessageDecoder belongs toin - the ByteBuf from which to read dataout - the List to which decoded messages should be addedException - is thrown if an error occursCopyright © 2008–2019 The Netty Project. All rights reserved.