org.apache.derby.client.am
Class BlobLocatorOutputStream

java.lang.Object
  java.io.OutputStream
      org.apache.derby.client.am.BlobLocatorOutputStream

All Implemented Interfaces:

java.io.Closeable, java.io.Flushable

public class BlobLocatorOutputStream
extends java.io.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 efficieny #write(byte[]) should be used instead of #write(int).

Field Summary

private Blob	blob The Blob to be accessed.
private Connection	connection Connection used to read Blob from server.
private long	currentPos Current position in the underlying Blob.

Constructor Summary

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

Method Summary

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 java.io.OutputStream

close, flush

Methods inherited from class java.lang.Object

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

Field Detail

connection

private final Connection connection

Connection used to read Blob from server.

blob

private final Blob blob

The Blob to be accessed.

currentPos

private long currentPos

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

Constructor Detail

BlobLocatorOutputStream

public BlobLocatorOutputStream(Connection connection,
                               Blob 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 Detail

write

public void write(int b)
           throws java.io.IOException

Specified by:

write in class java.io.OutputStream

Throws:

java.io.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 java.io.IOException

Overrides:

write in class java.io.OutputStream

Throws:

java.io.IOException

See Also:

OutputStream.write(byte[])

write

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

Overrides:

write in class java.io.OutputStream

Throws:

java.io.IOException

See Also:

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

writeBytes

private void writeBytes(byte[] b)
                 throws java.io.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:

java.io.IOException - Wrapped SqlException if writing to server fails.