org.postgresql.largeobject

Class BlobInputStream

java.lang.Object

java.io.InputStream

org.postgresql.largeobject.BlobInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class BlobInputStream
extends java.io.InputStream

This is an implementation of an InputStream from a large object.

Field Summary

Fields

Modifier and Type	Field and Description
private long	apos The absolute position.
private int	bpos Position within buffer.
private int	bsize The buffer size.
private byte[]	buffer Buffer used to improve performance.
private long	limit The limit.
private LargeObject	lo The parent LargeObject.
private long	mpos The mark position.

Constructor Summary

Constructors

Constructor and Description
BlobInputStream(LargeObject lo)
BlobInputStream(LargeObject lo, int bsize)
BlobInputStream(LargeObject lo, int bsize, long limit)

Method Summary

Modifier and Type	Method and Description
private void	checkClosed()
void	close() Closes this input stream and releases any system resources associated with the stream.
void	mark(int readlimit) Marks the current position in this input stream.
boolean	markSupported() Tests if this input stream supports the mark and reset methods.
int	read() The minimum required to implement input stream.
void	reset() Repositions this stream to the position at the time the mark method was last called on this input stream.

Methods inherited from class java.io.InputStream

available, read, read, skip

Methods inherited from class java.lang.Object

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

Field Detail

lo

private LargeObject lo

The parent LargeObject.

apos

private long apos

The absolute position.

buffer

private byte[] buffer

Buffer used to improve performance.

bpos

private int bpos

Position within buffer.

bsize

private int bsize

The buffer size.

mpos

private long mpos

The mark position.

limit

private long limit

The limit.

Constructor Detail

BlobInputStream

public BlobInputStream(LargeObject lo)

Parameters:

lo - LargeObject to read from

BlobInputStream

public BlobInputStream(LargeObject lo,
                       int bsize)

Parameters:

lo - LargeObject to read from

bsize - buffer size

BlobInputStream

public BlobInputStream(LargeObject lo,
                       int bsize,
                       long limit)

Parameters:

lo - LargeObject to read from

bsize - buffer size

limit - max number of bytes to read

Method Detail

read

public int read()
         throws java.io.IOException

The minimum required to implement input stream.

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Closes this input stream and releases any system resources associated with the stream.

The close method of InputStream does nothing.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException - if an I/O error occurs.

mark

public void mark(int readlimit)

Marks the current position in this input stream. A subsequent call to the reset method repositions this stream at the last marked position so that subsequent reads re-read the same bytes.

The readlimit arguments tells this input stream to allow that many bytes to be read before the mark position gets invalidated.

The general contract of mark is that, if the method markSupported returns true, the stream somehow remembers all the bytes read after the call to mark and stands ready to supply those same bytes again if and whenever the method reset is called. However, the stream is not required to remember any data at all if more than readlimit bytes are read from the stream before reset is called.

Marking a closed stream should not have any effect on the stream.

Overrides:

mark in class java.io.InputStream

Parameters:

readlimit - the maximum limit of bytes that can be read before the mark position becomes invalid.

See Also:

InputStream.reset()

reset

public void reset()
           throws java.io.IOException

Repositions this stream to the position at the time the mark method was last called on this input stream. NB: If mark is not called we move to the beginning.

Overrides:

reset in class java.io.InputStream

Throws:

java.io.IOException

See Also:

InputStream.mark(int), IOException

markSupported

public boolean markSupported()

Tests if this input stream supports the mark and reset methods. The markSupported method of InputStream returns false.

Overrides:

markSupported in class java.io.InputStream

Returns:

true if this true type supports the mark and reset method; false otherwise.

See Also:

InputStream.mark(int), InputStream.reset()

checkClosed

private void checkClosed()
                  throws java.io.IOException

Throws:

java.io.IOException