org.apache.derby.client.am
Class UpdateSensitiveBlobLocatorInputStream

java.lang.Object
  java.io.InputStream
      org.apache.derby.client.am.UpdateSensitiveLOBLocatorInputStream
          org.apache.derby.client.am.UpdateSensitiveBlobLocatorInputStream

All Implemented Interfaces:

java.io.Closeable

public class UpdateSensitiveBlobLocatorInputStream
extends UpdateSensitiveLOBLocatorInputStream

This class extends from the UpdateSensitiveLOBLocatorInputStream and creates and returns an implementation of the Blob specific locator InputStream. It also over-rides the reCreateStream method which re-creates the underlying Blob locator stream whenever a update happens on the Blob object associated with this stream.

Field Summary

private Blob

blob

Fields inherited from class org.apache.derby.client.am.UpdateSensitiveLOBLocatorInputStream

con, currentPos, length

Constructor Summary

UpdateSensitiveBlobLocatorInputStream(Connection con, Blob blob)
Creates an instance of the BlobLocatorInputStream and and calls the super class constructors with appropriate initializers.

UpdateSensitiveBlobLocatorInputStream(Connection con, Blob blob, long position, long length)
Creates an instance of the BlobLocatorInputStream.

Method Summary

protected java.io.InputStream

reCreateStream() Re-creates the underlying Locator stream with the current position and the length values if specified.

Methods inherited from class org.apache.derby.client.am.UpdateSensitiveLOBLocatorInputStream

close, read, read

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Field Detail

blob

private Blob blob

Constructor Detail

UpdateSensitiveBlobLocatorInputStream

public UpdateSensitiveBlobLocatorInputStream(Connection con,
                                             Blob blob)
                                      throws SqlException

Creates an instance of the BlobLocatorInputStream and and calls the super class constructors with appropriate initializers.

Parameters:

con - connection to be used to read the Blob value from the server

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

Throws:

SqlException - If any exception occurs during stream creation.

UpdateSensitiveBlobLocatorInputStream

public UpdateSensitiveBlobLocatorInputStream(Connection con,
                                             Blob blob,
                                             long position,
                                             long length)
                                      throws SqlException

Creates an instance of the BlobLocatorInputStream.

Parameters:

con - connection to be used to read the Blob value from the server

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

position - the position in the Blob of the first byte to read.

length - the maximum number of bytes to read from the Blob.

Throws:

SqlException - If any exception occurs during stream creation.

Method Detail

reCreateStream

protected java.io.InputStream reCreateStream()
                                      throws SqlException

Re-creates the underlying Locator stream with the current position and the length values if specified.

Specified by:

reCreateStream in class UpdateSensitiveLOBLocatorInputStream

Throws:

SqlException - If any exception occurs while re-creating the underlying streams.