org.jboss.netty.handler.stream
Class ChunkedFile

java.lang.Object
  org.jboss.netty.handler.stream.ChunkedFile

All Implemented Interfaces:

ChunkedInput

public class ChunkedFile
extends Object
implements ChunkedInput

A ChunkedInput that fetches data from a file chunk by chunk.

Version:

$Rev: 1685 $, $Date: 2009-08-28 16:15:49 +0900 (금, 28 8 2009) $

Author:

The Netty Project (netty-dev@lists.jboss.org), Trustin Lee (tlee@redhat.com)

Constructor Summary

ChunkedFile(File file)
Creates a new instance that fetches data from the specified file.

ChunkedFile(File file, int chunkSize)
Creates a new instance that fetches data from the specified file.

ChunkedFile(RandomAccessFile file)
Creates a new instance that fetches data from the specified file.

ChunkedFile(RandomAccessFile file, int chunkSize)
Creates a new instance that fetches data from the specified file.

ChunkedFile(RandomAccessFile file, long offset, long length, int chunkSize)
Creates a new instance that fetches data from the specified file.

Method Summary

void	close() Releases the resources associated with the stream.
long	getCurrentOffset() Returns the offset in the file where the transfer is happening currently.
long	getEndOffset() Returns the offset in the file where the transfer will end.
long	getStartOffset() Returns the offset in the file where the transfer began.
boolean	hasNextChunk() Returns true if and only if there is any data left in the stream.
Object	nextChunk() Fetches a chunked data from the stream.

Methods inherited from class java.lang.Object

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

Constructor Detail

ChunkedFile

public ChunkedFile(File file)
            throws IOException

Creates a new instance that fetches data from the specified file.

Throws:

IOException

ChunkedFile

public ChunkedFile(File file,
                   int chunkSize)
            throws IOException

Creates a new instance that fetches data from the specified file.

Parameters:

chunkSize - the number of bytes to fetch on each nextChunk() call

Throws:

IOException

ChunkedFile

public ChunkedFile(RandomAccessFile file)
            throws IOException

Creates a new instance that fetches data from the specified file.

Throws:

IOException

ChunkedFile

public ChunkedFile(RandomAccessFile file,
                   int chunkSize)
            throws IOException

Creates a new instance that fetches data from the specified file.

Parameters:

chunkSize - the number of bytes to fetch on each nextChunk() call

Throws:

IOException

ChunkedFile

public ChunkedFile(RandomAccessFile file,
                   long offset,
                   long length,
                   int chunkSize)
            throws IOException

Creates a new instance that fetches data from the specified file.

Parameters:

offset - the offset of the file where the transfer begins

length - the number of bytes to transfer

chunkSize - the number of bytes to fetch on each nextChunk() call

Throws:

IOException

Method Detail

getStartOffset

public long getStartOffset()

Returns the offset in the file where the transfer began.

getEndOffset

public long getEndOffset()

Returns the offset in the file where the transfer will end.

getCurrentOffset

public long getCurrentOffset()

Returns the offset in the file where the transfer is happening currently.

hasNextChunk

public boolean hasNextChunk()
                     throws Exception

Description copied from interface: ChunkedInput

Returns true if and only if there is any data left in the stream.

Specified by:

hasNextChunk in interface ChunkedInput

Throws:

Exception

close

public void close()
           throws Exception

Description copied from interface: ChunkedInput

Releases the resources associated with the stream.

Specified by:

close in interface ChunkedInput

Throws:

Exception

nextChunk

public Object nextChunk()
                 throws Exception

Description copied from interface: ChunkedInput

Fetches a chunked data from the stream. The returned chunk is usually a ChannelBuffer, but you could extend an existing implementation to convert the ChannelBuffer into a different type that your handler or encoder understands.

Specified by:

nextChunk in interface ChunkedInput

Returns:

the fetched chunk, which is usually ChannelBuffer. null if there is no data left in the stream.

Throws:

Exception