Package org.firebirdsql.gds.ng.wire.version10

Class V10InputBlob

java.lang.Object

org.firebirdsql.gds.ng.AbstractFbBlob

org.firebirdsql.gds.ng.wire.AbstractFbWireBlob

org.firebirdsql.gds.ng.wire.AbstractFbWireInputBlob

org.firebirdsql.gds.ng.wire.version10.V10InputBlob

All Implemented Interfaces:

AutoCloseable, FbBlob, DatabaseListener, ExceptionListenable, TransactionListener, FbWireBlob

public class V10InputBlob
extends AbstractFbWireInputBlob
implements FbWireBlob, DatabaseListener

Since:

3.0

Author:

Mark Rotteveel

Nested Class Summary

Nested classes/interfaces inherited from interface org.firebirdsql.gds.ng.FbBlob

FbBlob.SeekMode

Field Summary

Fields inherited from class org.firebirdsql.gds.ng.AbstractFbBlob

exceptionListenerDispatcher

Fields inherited from interface org.firebirdsql.gds.ng.FbBlob

NO_BLOB_ID

Constructor Summary

Constructors

Constructor	Description
V10InputBlob(FbWireDatabase database, FbWireTransaction transaction, BlobParameterBuffer blobParameterBuffer, long blobId)

Method Summary

Modifier and Type	Method	Description
byte[]	getSegment(int sizeRequested)	Gets a segment of blob data.
void	open()	Opens an existing input blob, or creates an output blob.
void	seek(int offset, FbBlob.SeekMode seekMode)	Performs a seek on a blob with the specified seekMode and offset.

Methods inherited from class org.firebirdsql.gds.ng.wire.AbstractFbWireInputBlob

getBlobId, isOutput, putSegment

Methods inherited from class org.firebirdsql.gds.ng.wire.AbstractFbWireBlob

cancelImpl, closeImpl, getBlobInfo, getDatabase, getHandle, releaseBlob, releaseResources, setHandle

Methods inherited from class org.firebirdsql.gds.ng.AbstractFbBlob

addExceptionListener, cancel, checkBlobClosed, checkBlobOpen, checkDatabaseAttached, checkTransactionActive, clearDatabase, clearTransaction, close, createBlobLengthProcessor, detached, detaching, getBlobInfo, getBlobParameterBuffer, getMaximumSegmentSize, getSynchronizationObject, getTransaction, isEndingTransaction, isEof, isOpen, length, removeExceptionListener, resetEof, setEof, setOpen, transactionStateChanged, warningReceived

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.firebirdsql.gds.ng.listeners.DatabaseListener

detached, detaching, warningReceived

Methods inherited from interface org.firebirdsql.gds.ng.listeners.ExceptionListenable

addExceptionListener, removeExceptionListener

Methods inherited from interface org.firebirdsql.gds.ng.FbBlob

cancel, close, getBlobId, getBlobInfo, getBlobInfo, getDatabase, getHandle, getMaximumSegmentSize, getSynchronizationObject, isEof, isOpen, isOutput, length, putSegment

Constructor Details

V10InputBlob

public V10InputBlob(FbWireDatabase database,
 FbWireTransaction transaction,
 BlobParameterBuffer blobParameterBuffer,
 long blobId)

Method Details

open

public void open()
          throws SQLException

Description copied from interface: FbBlob

Opens an existing input blob, or creates an output blob.

Specified by:

open in interface FbBlob

Throws:

SQLException - If the blob is already open, this is a (closed) output blob and it already has a blobId, the transaction is not active, or a database connection error occurred

getSegment

public byte[] getSegment(int sizeRequested)
                  throws SQLException

Description copied from interface: FbBlob

Gets a segment of blob data.

When sizeRequested exceeds FbBlob.getMaximumSegmentSize() it is silently reduced to the maximum segment size.

TODO: Consider allowing this and have the implementation handle longer segments by sending multiple (batched?) requests.

Specified by:

getSegment in interface FbBlob

Parameters:

sizeRequested - Requested segment size (> 0).

Returns:

Retrieved segment (size may be less than requested)

Throws:

SQLException - If this is an output blob, the blob is closed, the transaction is not active, or a database connection error occurred.

seek

public void seek(int offset,
 FbBlob.SeekMode seekMode)
          throws SQLException

Description copied from interface: FbBlob

Performs a seek on a blob with the specified seekMode and offset.

Firebird only supports seek on stream blobs.

Specified by:

seek in interface FbBlob

Parameters:

offset - Offset of the seek, effect depends on value of seekMode

seekMode - Value of FbBlob.SeekMode

Throws:

SQLException - If the blob is closed, the transaction is not active, or a database error occurred.