Package org.duracloud.chunk

Class ChunkableContent

java.lang.Object

org.duracloud.chunk.ChunkableContent

All Implemented Interfaces:

Iterable<ChunkInputStream>, Iterator<ChunkInputStream>

public class ChunkableContent
extends Object
implements Iterable<ChunkInputStream>, Iterator<ChunkInputStream>

This class manages the provided content stream by breaking it chunks of the size specified by maxChunkSize.

Author:

Andrew Woods Date: Feb 2, 2010

Constructor Summary

Constructors

Constructor	Description
ChunkableContent(String contentId, InputStream largeStream, long contentSize, long maxChunkSize)
ChunkableContent(String contentId, String contentMimetype, InputStream largeStream, long contentSize, long maxChunkSize)

Method Summary

Modifier and Type	Method	Description
protected int	calculateBufferSize(long maxChunkSize)	This method finds the maximum 1-KB divisor of arg maxChunkSize that is less than 8-KB.
ChunksManifest	finalizeManifest()
ChunksManifest	getManifest()
long	getMaxChunkSize()
boolean	hasNext()	This method indicates if there are any more chunks.
Iterator<ChunkInputStream>	iterator()
ChunkInputStream	next()	This method returns the next chunk of the wrapped InputStream.
void	remove()
void	setPreserveChunkMD5s(boolean preserveChunkMD5s)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface java.util.Iterator

forEachRemaining

Constructor Details

ChunkableContent

public ChunkableContent(String contentId,
 InputStream largeStream,
 long contentSize,
 long maxChunkSize)

ChunkableContent

public ChunkableContent(String contentId,
 String contentMimetype,
 InputStream largeStream,
 long contentSize,
 long maxChunkSize)

Method Details

calculateBufferSize

protected int calculateBufferSize(long maxChunkSize)

This method finds the maximum 1-KB divisor of arg maxChunkSize that is less than 8-KB. It also ensures that arg maxChunkSize is a multiple of 1-KB, otherwise the stream buffering would lose bytes if the maxChunkSize was not divisible by the buffer size. Additionally, by making the buffer multiples of 1-KB ensures efficient block-writing.

Parameters:

maxChunkSize - of chunk stream

Returns:

efficient buffer size for given arg chunk-size

hasNext

public boolean hasNext()

This method indicates if there are any more chunks.

Specified by:

hasNext in interface Iterator<ChunkInputStream>

Returns:

true if more chunks are available.

next

public ChunkInputStream next()

This method returns the next chunk of the wrapped InputStream.

Throws a runtime exception if next() is called before previous stream was fully read.

Specified by:

next in interface Iterator<ChunkInputStream>

Returns:

next chunk as InputStream

remove

public void remove()

Specified by:

remove in interface Iterator<ChunkInputStream>

iterator

public Iterator<ChunkInputStream> iterator()

Specified by:

iterator in interface Iterable<ChunkInputStream>

setPreserveChunkMD5s

public void setPreserveChunkMD5s(boolean preserveChunkMD5s)

getMaxChunkSize

public long getMaxChunkSize()

getManifest

public ChunksManifest getManifest()

finalizeManifest

public ChunksManifest finalizeManifest()