Class BlobLocatorOutputStream

java.lang.Object

java.io.OutputStream

org.apache.derby.client.am.BlobLocatorOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

class BlobLocatorOutputStream
extends OutputStream

An OutputStream that will use an locator to write bytes to the Blob value on the server.

Closing a BlobLocatorOutputStream has no effect. The methods in this class can be called after the stream has been closed without generating an IOException.

This OutputStream implementation is pretty basic. No buffering of data is done. Hence, for efficiency #write(byte[]) should be used instead of #write(int).

Field Summary

Fields

Modifier and Type	Field	Description
private final ClientBlob	blob	The Blob to be accessed.
private final ClientConnection	connection	Connection used to read Blob from server.
private long	currentPos	Current position in the underlying Blob.

Constructor Summary

Constructors

Constructor	Description
BlobLocatorOutputStream(ClientConnection connection, ClientBlob blob, long pos)	Create an OutputStream for writing to the Blob value represented by the given locator based Blob object.

Method Summary

Modifier and Type	Method	Description
void	write(byte[] b)
void	write(byte[] b, int off, int len)
void	write(int b)
private void	writeBytes(byte[] b)	Write the byte[] to the Blob value on the server; starting from the current position of this stream.

Methods inherited from class OutputStream

close, flush, nullOutputStream

Methods inherited from class Object

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

Field Details

connection

private final ClientConnection connection

Connection used to read Blob from server.

blob

private final ClientBlob blob

The Blob to be accessed.

currentPos

private long currentPos

Current position in the underlying Blob. Blobs are indexed from 1

Constructor Details

BlobLocatorOutputStream

BlobLocatorOutputStream(ClientConnection connection,
 ClientBlob blob,
 long pos)
                 throws SqlException

Create an OutputStream for writing to the Blob value represented by the given locator based Blob object.

Parameters:

connection - connection to be used to write to the Blob value on the server

blob - Blob object that contains locator for the Blob value on the server.

pos - the position in the BLOB value at which to start writing; the first position is 1

Throws:

SqlException

Method Details

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

See Also:

• This method writes one byte at a time to the server. For more efficient writing, use #write(byte[]).

write

public void write(byte[] b)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

See Also:

• OutputStream.write(byte[])

write

public void write(byte[] b,
 int off,
 int len)
           throws IOException

Overrides:

write in class OutputStream

Throws:

IOException

See Also:

• OutputStream.write(byte[], int, int)

writeBytes

private void writeBytes(byte[] b)
                 throws IOException

Write the byte[] to the Blob value on the server; starting from the current position of this stream.

Parameters:

b - The byte array containing the bytes to be written

Throws:

IOException - Wrapped SqlException if writing to server fails.