org.apache.jackrabbit.oak.spi.blob

Interface BlobStore

All Known Subinterfaces:

GarbageCollectableBlobStore

All Known Implementing Classes:

AbstractBlobStore, FileBlobStore, MemoryBlobStore

public interface BlobStore

An interface to store and read large binary objects.

Method Summary

Methods

Modifier and Type	Method and Description
String	getBlobId(String reference) Returns the blobId that referred by the given binary reference.
long	getBlobLength(String blobId) Get the length of the blob.
InputStream	getInputStream(String blobId) Returns a new stream for given blobId.
String	getReference(String blobId) Returns a secure reference to blob referred by blobid, or null if no such reference is available.
int	readBlob(String blobId, long pos, byte[] buff, int off, int length) Read a number of bytes from a blob.
String	writeBlob(InputStream in) Write a blob from an input stream.

Method Detail

writeBlob

String writeBlob(InputStream in)
                 throws IOException

Write a blob from an input stream. This method closes the input stream.

Parameters:

in - the input stream

Returns:

the blob id

Throws:

IOException

readBlob

int readBlob(String blobId,
           long pos,
           byte[] buff,
           int off,
           int length)
             throws IOException

Read a number of bytes from a blob.

Parameters:

blobId - the blob id

pos - the position within the blob

buff - the target byte array

off - the offset within the target array

length - the number of bytes to read

Returns:

the number of bytes read

Throws:

IOException

getBlobLength

long getBlobLength(String blobId)
                   throws IOException

Get the length of the blob.

Parameters:

blobId - the blob id

Returns:

the length

Throws:

IOException

getInputStream

InputStream getInputStream(String blobId)
                           throws IOException

Returns a new stream for given blobId. The streams returned from multiple calls to this method are byte wise equals. That is, subsequent calls to read return the same sequence of bytes as long as neither call throws an exception.

Parameters:

blobId - the blob id

Returns:

a new stream for given blobId

Throws:

IOException

getBlobId

String getBlobId(String reference)

Returns the blobId that referred by the given binary reference. Returns null if the reference is invalid, for example if it points to a blob that does not exist.

Parameters:

reference - binary reference

Returns:

matching blobId, or null

getReference

String getReference(String blobId)

Returns a secure reference to blob referred by blobid, or null if no such reference is available.

Parameters:

blobId - blobId referring the blob for which reference is required

Returns:

binary reference, or null