com.amazon.carbonado.lob

Class BlobClob

java.lang.Object

com.amazon.carbonado.lob.AbstractClob

com.amazon.carbonado.lob.BlobClob

All Implemented Interfaces:

Clob, Lob

public class BlobClob
extends AbstractClob

A Clob implementation which is backed by a Blob. Data is stored in the Blob using UTF-16BE encoding.

Author:

Brian S O'Neill, Bob Loblaw

Constructor Summary

Constructors

Constructor and Description
BlobClob(Blob blob)

Method Summary

Methods

Modifier and Type	Method and Description
long	getLength() Returns the length of this Clob, in characters.
java.lang.Object	getLocator() Returns an object which identifies the Lob data, which may be null if not supported.
protected Blob	getWrappedBlob()
java.io.Reader	openReader() Returns a Reader for reading Clob data, positioned at the start.
java.io.Reader	openReader(long pos) Returns a Reader for reading Clob data.
java.io.Reader	openReader(long pos, int bufferSize) Returns a Reader for reading Clob data.
java.io.Writer	openWriter() Returns a Writer for writing Clob data, positioned at the start.
java.io.Writer	openWriter(long pos) Returns a Writer for writing Clob data.
java.io.Writer	openWriter(long pos, int bufferSize) Returns a Writer for writing Clob data.
void	setLength(long length) Set the length of this Clob, in characters.

Methods inherited from class com.amazon.carbonado.lob.AbstractClob

asString, equals, hashCode, setValue, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

BlobClob

public BlobClob(Blob blob)

Parameters:

blob - blob to wrap

Method Detail

openReader

public java.io.Reader openReader()
                          throws FetchException

Description copied from interface: Clob

Returns a Reader for reading Clob data, positioned at the start. The Clob implementation selects an appropriate buffer size for the reader.

Returns:

Reader for this Blob, which is not guaranteed to be thread-safe

Throws:

FetchException

openReader

public java.io.Reader openReader(long pos)
                          throws FetchException

Description copied from interface: Clob

Returns a Reader for reading Clob data. The Clob implementation selects an appropriate buffer size for the reader.

Parameters:

pos - desired zero-based position to read from

Returns:

Reader for this Blob, which is not guaranteed to be thread-safe

Throws:

FetchException

openReader

public java.io.Reader openReader(long pos,
                        int bufferSize)
                          throws FetchException

Description copied from interface: Clob

Returns a Reader for reading Clob data. A suggested buffer size must be provided, but it might be ignored by the Clob implementation.

Parameters:

pos - desired zero-based position to read from

bufferSize - suggest that the reader buffer be at least this large (in characters)

Returns:

Reader for this Blob, which is not guaranteed to be thread-safe

Throws:

FetchException

getLength

public long getLength()
               throws FetchException

Description copied from interface: Clob

Returns the length of this Clob, in characters.

Throws:

FetchException

openWriter

public java.io.Writer openWriter()
                          throws PersistException

Description copied from interface: Clob

Returns a Writer for writing Clob data, positioned at the start. The Clob implementation selects an appropriate buffer size for the writer.

Returns:

Writer for this Blob, which is not guaranteed to be thread-safe

Throws:

PersistException

openWriter

public java.io.Writer openWriter(long pos)
                          throws PersistException

Description copied from interface: Clob

Returns a Writer for writing Clob data. The Clob implementation selects an appropriate buffer size for the writer.

Parameters:

pos - desired zero-based position to write to

Returns:

Writer for this Blob, which is not guaranteed to be thread-safe

Throws:

PersistException

openWriter

public java.io.Writer openWriter(long pos,
                        int bufferSize)
                          throws PersistException

Description copied from interface: Clob

Returns a Writer for writing Clob data. A suggested buffer size must be provided, but it might be ignored by the Clob implementation.

Parameters:

pos - desired zero-based position to write to

bufferSize - suggest that the writer buffer be at least this large (in characters)

Returns:

Writer for this Blob, which is not guaranteed to be thread-safe

Throws:

PersistException

setLength

public void setLength(long length)
               throws PersistException

Description copied from interface: Clob

Set the length of this Clob, in characters. If the new length is shorter, the Clob is truncated. If the new length is longer, the Clob is padded with '\0' characters.

Parameters:

length - new length to set to

Throws:

PersistDeniedException - if Clob is read-only

PersistException

getLocator

public java.lang.Object getLocator()

Description copied from interface: Lob

Returns an object which identifies the Lob data, which may be null if not supported.

getWrappedBlob

protected Blob getWrappedBlob()