stream.io

Class ByteChunkStream

java.lang.Object

stream.io.AbstractStream

stream.io.ByteChunkStream

All Implemented Interfaces:

stream.io.Source, stream.io.Stream

Direct Known Subclasses:

GifImageStream, MJpegImageStreamOld

public abstract class ByteChunkStream
extends stream.io.AbstractStream

This class implements a fast byte-oriented stream of byte chunks. The chunks are found by checking for a start-signature (i.e. byte array). The stream returns a sequence of data items, each holding a chunk of bytes.

Author:

Christian Bockermann <chris@jwall.org>

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_BUFFER_SIZE
static byte[]	GIF_SIGNATURE
static byte[]	JPG_SIGNATURE

Fields inherited from class stream.io.AbstractStream

count, id, in, limit, prefix, seqId, sequenceKey

Constructor Summary

Constructors

Constructor and Description
ByteChunkStream(InputStream in, byte[] signature)
ByteChunkStream(stream.io.SourceURL url, byte[] signature)

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
int	getBufferSize()
protected int	indexOf(byte[] sig, int from)
void	init()
protected boolean	isSignatureAt(int pos, byte[] sig)
stream.Data	readNext()
void	setBufferSize(stream.util.ByteSize bufferSize)

Methods inherited from class stream.io.AbstractStream

getId, getInputStream, getLimit, getPrefix, getSequenceKey, getUrl, read, setId, setLimit, setPrefix, setSequenceKey, setUrl

Methods inherited from class java.lang.Object

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

Field Detail

GIF_SIGNATURE

public static final byte[] GIF_SIGNATURE

JPG_SIGNATURE

public static final byte[] JPG_SIGNATURE

DEFAULT_BUFFER_SIZE

public static final int DEFAULT_BUFFER_SIZE

See Also:

Constant Field Values

Constructor Detail

ByteChunkStream

public ByteChunkStream(stream.io.SourceURL url,
               byte[] signature)
                throws Exception

Throws:

Exception

ByteChunkStream

public ByteChunkStream(InputStream in,
               byte[] signature)
                throws Exception

Throws:

Exception

Method Detail

init

public void init()
          throws Exception

Specified by:

init in interface stream.io.Source

Overrides:

init in class stream.io.AbstractStream

Throws:

Exception

See Also:

stream.io.AbstractDataStream#init()

close

public void close()
           throws Exception

Specified by:

close in interface stream.io.Source

Overrides:

close in class stream.io.AbstractStream

Throws:

Exception

See Also:

stream.io.DataStream#close()

getBufferSize

public int getBufferSize()

Returns:

the bufferSize

setBufferSize

@Parameter(description="The internal buffer size of this stream.")
public void setBufferSize(stream.util.ByteSize bufferSize)

Parameters:

bufferSize - the bufferSize to set

indexOf

protected int indexOf(byte[] sig,
          int from)

Parameters:

sig -

from -

Returns:

isSignatureAt

protected boolean isSignatureAt(int pos,
                    byte[] sig)

Parameters:

pos -

sig -

Returns:

readNext

public stream.Data readNext()
                     throws Exception

Specified by:

readNext in class stream.io.AbstractStream

Throws:

Exception

See Also:

stream.io.AbstractDataStream#readItem(stream.data.Data)