org.apache.http.impl.nio.codecs
Class LengthDelimitedDecoder

java.lang.Object
  org.apache.http.impl.nio.codecs.AbstractContentDecoder
      org.apache.http.impl.nio.codecs.LengthDelimitedDecoder

All Implemented Interfaces:

ContentDecoder, FileContentDecoder

public class LengthDelimitedDecoder
extends AbstractContentDecoder
implements FileContentDecoder

Content decoder that cuts off after a defined number of bytes. This class is used to receive content of HTTP messages where the end of the content entity is determined by the value of the Content-Length header. Entities transferred using this stream can be maximum Long.MAX_VALUE long.

This decoder is optimized to transfer data directly from the underlying I/O session's channel to a FileChannel, whenever possible avoiding intermediate buffering in the session buffer.

Since:

4.0

Field Summary

Fields inherited from class org.apache.http.impl.nio.codecs.AbstractContentDecoder

buffer, channel, completed, metrics

Constructor Summary

LengthDelimitedDecoder(ReadableByteChannel channel, SessionInputBuffer buffer, HttpTransportMetricsImpl metrics, long contentLength)

Method Summary

int	read(ByteBuffer dst) Reads a portion of content from the underlying channel
String	toString()
long	transfer(FileChannel dst, long position, long count) Transfers a portion of entity content from the underlying network channel into the given file channel.

Methods inherited from class org.apache.http.impl.nio.codecs.AbstractContentDecoder

fillBufferFromChannel, isCompleted, readFromChannel, readFromChannel, setCompleted, setCompleted

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.http.nio.ContentDecoder

isCompleted

Constructor Detail

LengthDelimitedDecoder

public LengthDelimitedDecoder(ReadableByteChannel channel,
                              SessionInputBuffer buffer,
                              HttpTransportMetricsImpl metrics,
                              long contentLength)

Method Detail

read

public int read(ByteBuffer dst)
         throws IOException

Description copied from interface: ContentDecoder

Reads a portion of content from the underlying channel

Specified by:

read in interface ContentDecoder

Parameters:

dst - The buffer into which entity content is to be transferred

Returns:

The number of bytes read, possibly zero, or -1 if the channel has reached end-of-stream

Throws:

IOException - if I/O error occurs while reading content

transfer

public long transfer(FileChannel dst,
                     long position,
                     long count)
              throws IOException

Description copied from interface: FileContentDecoder

Transfers a portion of entity content from the underlying network channel into the given file channel.

Warning: Many implementations cannot write beyond the length of the file. If the position exceeds the channel's size, some implementations may throw an IOException.

Specified by:

transfer in interface FileContentDecoder

Parameters:

dst - the target FileChannel to transfer data into.

position - The position within the file at which the transfer is to begin; must be non-negative. Must be less than or equal to the size of the file

count - The maximum number of bytes to be transferred; must be non-negative

Returns:

The number of bytes, possibly zero, that were actually transferred

Throws:

IOException - if some I/O error occurs.

toString

public String toString()

Overrides:

toString in class Object