Package org.postgresql.largeobject

Class BlobOutputStream

java.lang.Object

java.io.OutputStream

org.postgresql.largeobject.BlobOutputStream

All Implemented Interfaces:

Closeable, Flushable, AutoCloseable

public class BlobOutputStream
extends OutputStream

This implements a basic output stream that writes to a LargeObject.

Field Summary

Fields

Modifier and Type	Field	Description
private byte[]	buf	Buffer.
private int	bufferPosition	Position within the buffer.
(package private) static final int	DEFAULT_MAX_BUFFER_SIZE
private LargeObject	lo	The parent LargeObject.
private final ResourceLock	lock
private final int	maxBufferSize	Size of the buffer (default 1K).

Constructor Summary

Constructors

Constructor	Description
BlobOutputStream(LargeObject lo)	Create an OutputStream to a large object.
BlobOutputStream(LargeObject lo, int bufferSize)	Create an OutputStream to a large object.

Method Summary

Modifier and Type	Method	Description
private LargeObject	checkClosed()
void	close()
void	flush()	Flushes this output stream and forces any buffered output bytes to be written out.
private byte[]	growBuffer(int extraBytes)	Grows an internal buffer to ensure the extra bytes fit in the buffer.
void	write(byte[] b, int off, int len)
void	write(int b)

Methods inherited from class java.io.OutputStream

nullOutputStream, write

Methods inherited from class java.lang.Object

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

Field Details

DEFAULT_MAX_BUFFER_SIZE

static final int DEFAULT_MAX_BUFFER_SIZE

See Also:

• Constant Field Values

lo

private LargeObject lo

The parent LargeObject.

lock

private final ResourceLock lock

buf

private byte[] buf

Buffer.

maxBufferSize

private final int maxBufferSize

Size of the buffer (default 1K).

bufferPosition

private int bufferPosition

Position within the buffer.

Constructor Details

BlobOutputStream

public BlobOutputStream(LargeObject lo)

Create an OutputStream to a large object.

Parameters:

lo - LargeObject

BlobOutputStream

public BlobOutputStream(LargeObject lo,
 int bufferSize)

Create an OutputStream to a large object.

Parameters:

lo - LargeObject

bufferSize - The size of the buffer for single-byte writes

Method Details

growBuffer

private byte[] growBuffer(int extraBytes)

Grows an internal buffer to ensure the extra bytes fit in the buffer.

Parameters:

extraBytes - the number of extra bytes that should fit in the buffer

Returns:

new buffer

write

public void write(int b)
           throws IOException

Specified by:

write in class OutputStream

Throws:

IOException

write

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

Overrides:

write in class OutputStream

Throws:

IOException

flush

public void flush()
           throws IOException

Flushes this output stream and forces any buffered output bytes to be written out. The general contract of flush is that calling it is an indication that, if any bytes previously written have been buffered by the implementation of the output stream, such bytes should immediately be written to their intended destination.

Specified by:

flush in interface Flushable

Overrides:

flush in class OutputStream

Throws:

IOException - if an I/O error occurs.

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class OutputStream

Throws:

IOException

checkClosed

private LargeObject checkClosed()
                         throws IOException

Throws:

IOException