org.firebirdsql.gds.ng.wire

Class AbstractFbWireOutputBlob

java.lang.Object

org.firebirdsql.gds.ng.AbstractFbBlob

org.firebirdsql.gds.ng.wire.AbstractFbWireBlob

org.firebirdsql.gds.ng.wire.AbstractFbWireOutputBlob

All Implemented Interfaces:

java.lang.AutoCloseable, FbBlob, DatabaseListener, ExceptionListenable, TransactionListener, FbWireBlob

Direct Known Subclasses:

V10OutputBlob

public abstract class AbstractFbWireOutputBlob
extends AbstractFbWireBlob

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

Modifier	Constructor and Description
protected	AbstractFbWireOutputBlob(FbWireDatabase database, FbWireTransaction transaction, BlobParameterBuffer blobParameterBuffer)

Method Summary

Modifier and Type	Method and Description
long	getBlobId()
byte[]	getSegment(int sizeRequested) Gets a segment of blob data.
boolean	isOutput()
void	seek(int offset, FbBlob.SeekMode seekMode) Performs a seek on a blob with the specified seekMode and offset.
protected void	setBlobId(long blobId) Sets the blob id.

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.FbBlob

cancel, close, getBlobInfo, getMaximumSegmentSize, getSynchronizationObject, isEof, isOpen, length, open, putSegment

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

addExceptionListener, removeExceptionListener

Constructor Detail

AbstractFbWireOutputBlob

protected AbstractFbWireOutputBlob(FbWireDatabase database,
                                   FbWireTransaction transaction,
                                   BlobParameterBuffer blobParameterBuffer)

Method Detail

getBlobId

public final long getBlobId()

Returns:

The Firebird blob id

setBlobId

protected final void setBlobId(long blobId)
                        throws java.sql.SQLException

Sets the blob id.

Parameters:

blobId - Blob id.

Throws:

java.sql.SQLException - If this is an input blob, or if this is an output blob whose blobId was already set.

isOutput

public final boolean isOutput()

Returns:

true if this is an output blob (write only), false if this is an input blob (read only)

getSegment

public final byte[] getSegment(int sizeRequested)
                        throws java.sql.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.

Parameters:

sizeRequested - Requested segment size (> 0).

Returns:

Retrieved segment (size may be less than requested)

Throws:

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

seek

public final void seek(int offset,
                       FbBlob.SeekMode seekMode)
                throws java.sql.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.

Parameters:

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

seekMode - Value of FbBlob.SeekMode

Throws:

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