io.netty.handler.codec.compression

Class JZlibEncoder

java.lang.Object

io.netty.channel.ChannelHandlerAdapter

io.netty.channel.ChannelOperationHandlerAdapter

io.netty.channel.ChannelOutboundByteHandlerAdapter

io.netty.handler.codec.ByteToByteEncoder

io.netty.handler.codec.compression.ZlibEncoder

io.netty.handler.codec.compression.JZlibEncoder

All Implemented Interfaces:

io.netty.channel.ChannelHandler, io.netty.channel.ChannelOperationHandler, io.netty.channel.ChannelOutboundByteHandler

public class JZlibEncoder
extends ZlibEncoder

Compresses a ByteBuf using the deflate algorithm.

Nested Class Summary

Nested classes/interfaces inherited from interface io.netty.channel.ChannelHandler

io.netty.channel.ChannelHandler.Sharable

Constructor Summary

Constructors

Constructor and Description
JZlibEncoder() Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the default wrapper (ZlibWrapper.ZLIB).
JZlibEncoder(byte[] dictionary) Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the specified preset dictionary.
JZlibEncoder(int compressionLevel) Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the default wrapper (ZlibWrapper.ZLIB).
JZlibEncoder(int compressionLevel, byte[] dictionary) Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the specified preset dictionary.
JZlibEncoder(int compressionLevel, int windowBits, int memLevel, byte[] dictionary) Creates a new zlib encoder with the specified compressionLevel, the specified windowBits, the specified memLevel, and the specified preset dictionary.
JZlibEncoder(ZlibWrapper wrapper) Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the specified wrapper.
JZlibEncoder(ZlibWrapper wrapper, int compressionLevel) Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the specified wrapper.
JZlibEncoder(ZlibWrapper wrapper, int compressionLevel, int windowBits, int memLevel) Creates a new zlib encoder with the specified compressionLevel, the specified windowBits, the specified memLevel, and the specified wrapper.

Method Summary

Methods

Modifier and Type	Method and Description
void	beforeAdd(io.netty.channel.ChannelHandlerContext ctx)
io.netty.channel.ChannelFuture	close() Close this ZlibEncoder and so finish the encoding.
void	close(io.netty.channel.ChannelHandlerContext ctx, io.netty.channel.ChannelPromise promise)
io.netty.channel.ChannelFuture	close(io.netty.channel.ChannelPromise promise) Close this ZlibEncoder and so finish the encoding.
protected void	encode(io.netty.channel.ChannelHandlerContext ctx, io.netty.buffer.ByteBuf in, io.netty.buffer.ByteBuf out) Encodes the from one ByteBuf to an other.
boolean	isClosed() Returns true if and only if the end of the compressed stream has been reached.

Methods inherited from class io.netty.handler.codec.ByteToByteEncoder

flush, sendFile

Methods inherited from class io.netty.channel.ChannelOutboundByteHandlerAdapter

discardOutboundReadBytes, flush, freeOutboundBuffer, newOutboundBuffer

Methods inherited from class io.netty.channel.ChannelOperationHandlerAdapter

bind, connect, deregister, disconnect, read

Methods inherited from class io.netty.channel.ChannelHandlerAdapter

afterAdd, afterRemove, beforeRemove, exceptionCaught

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.netty.channel.ChannelOperationHandler

bind, connect, deregister, disconnect, read

Methods inherited from interface io.netty.channel.ChannelHandler

afterAdd, afterRemove, beforeRemove, exceptionCaught

Constructor Detail

JZlibEncoder

public JZlibEncoder()

Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the default wrapper (ZlibWrapper.ZLIB).

Throws:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(int compressionLevel)

Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the default wrapper (ZlibWrapper.ZLIB).

Parameters:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

Throws:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(ZlibWrapper wrapper)

Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the specified wrapper.

Throws:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(ZlibWrapper wrapper,
            int compressionLevel)

Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the specified wrapper.

Parameters:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

Throws:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(ZlibWrapper wrapper,
            int compressionLevel,
            int windowBits,
            int memLevel)

Creates a new zlib encoder with the specified compressionLevel, the specified windowBits, the specified memLevel, and the specified wrapper.

Parameters:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

windowBits - The base two logarithm of the size of the history buffer. The value should be in the range 9 to 15 inclusive. Larger values result in better compression at the expense of memory usage. The default value is 15.

memLevel - How much memory should be allocated for the internal compression state. 1 uses minimum memory and 9 uses maximum memory. Larger values result in better and faster compression at the expense of memory usage. The default value is 8

Throws:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(byte[] dictionary)

Creates a new zlib encoder with the default compression level (6), default window bits (15), default memory level (8), and the specified preset dictionary. The wrapper is always ZlibWrapper.ZLIB because it is the only format that supports the preset dictionary.

Parameters:

dictionary - the preset dictionary

Throws:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(int compressionLevel,
            byte[] dictionary)

Creates a new zlib encoder with the specified compressionLevel, default window bits (15), default memory level (8), and the specified preset dictionary. The wrapper is always ZlibWrapper.ZLIB because it is the only format that supports the preset dictionary.

Parameters:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

dictionary - the preset dictionary

Throws:

CompressionException - if failed to initialize zlib

JZlibEncoder

public JZlibEncoder(int compressionLevel,
            int windowBits,
            int memLevel,
            byte[] dictionary)

Creates a new zlib encoder with the specified compressionLevel, the specified windowBits, the specified memLevel, and the specified preset dictionary. The wrapper is always ZlibWrapper.ZLIB because it is the only format that supports the preset dictionary.

Parameters:

compressionLevel - 1 yields the fastest compression and 9 yields the best compression. 0 means no compression. The default compression level is 6.

windowBits - The base two logarithm of the size of the history buffer. The value should be in the range 9 to 15 inclusive. Larger values result in better compression at the expense of memory usage. The default value is 15.

memLevel - How much memory should be allocated for the internal compression state. 1 uses minimum memory and 9 uses maximum memory. Larger values result in better and faster compression at the expense of memory usage. The default value is 8

dictionary - the preset dictionary

Throws:

CompressionException - if failed to initialize zlib

Method Detail

close

public io.netty.channel.ChannelFuture close()

Description copied from class: ZlibEncoder

Close this ZlibEncoder and so finish the encoding. The returned ChannelFuture will be notified once the operation completes.

Specified by:

close in class ZlibEncoder

close

public io.netty.channel.ChannelFuture close(io.netty.channel.ChannelPromise promise)

Description copied from class: ZlibEncoder

Close this ZlibEncoder and so finish the encoding. The given ChannelFuture will be notified once the operation completes and will also be returned.

Specified by:

close in class ZlibEncoder

isClosed

public boolean isClosed()

Description copied from class: ZlibEncoder

Returns true if and only if the end of the compressed stream has been reached.

Specified by:

isClosed in class ZlibEncoder

encode

protected void encode(io.netty.channel.ChannelHandlerContext ctx,
          io.netty.buffer.ByteBuf in,
          io.netty.buffer.ByteBuf out)
               throws Exception

Description copied from class: ByteToByteEncoder

Encodes the from one ByteBuf to an other. This method will be called till either the input ByteBuf has nothing to read anymore or till nothing was read from the input ByteBuf.

Specified by:

encode in class ByteToByteEncoder

Parameters:

ctx - the ChannelHandlerContext which this ByteToByteDecoder belongs to

in - the ByteBuf from which to read data

out - the ByteBuf to which the decoded data will be written

Throws:

Exception - is thrown if an error accour

close

public void close(io.netty.channel.ChannelHandlerContext ctx,
         io.netty.channel.ChannelPromise promise)
           throws Exception

Specified by:

close in interface io.netty.channel.ChannelOperationHandler

Overrides:

close in class io.netty.channel.ChannelOperationHandlerAdapter

Throws:

Exception

beforeAdd

public void beforeAdd(io.netty.channel.ChannelHandlerContext ctx)
               throws Exception

Specified by:

beforeAdd in interface io.netty.channel.ChannelHandler

Overrides:

beforeAdd in class io.netty.channel.ChannelHandlerAdapter

Throws:

Exception