com.itextpdf.text.io
Class WindowRandomAccessSource

java.lang.Object
  com.itextpdf.text.io.WindowRandomAccessSource

All Implemented Interfaces:

RandomAccessSource

public class WindowRandomAccessSource
extends Object
implements RandomAccessSource

A RandomAccessSource that wraps another RandomAccessSouce and provides a window of it at a specific offset and over a specific length. Position 0 becomes the offset position in the underlying source.

Since:

5.3.5

Constructor Summary

WindowRandomAccessSource(RandomAccessSource source, long offset)
Constructs a new OffsetRandomAccessSource that extends to the end of the underlying source

WindowRandomAccessSource(RandomAccessSource source, long offset, long length)
Constructs a new OffsetRandomAccessSource with an explicit length

Method Summary

void	close() Closes this source.
int	get(long position) Gets a byte at the specified position Note that the position will be adjusted to read from the corrected location in the underlying source
int	get(long position, byte[] bytes, int off, int len) Gets an array at the specified position. Note that the position will be adjusted to read from the corrected location in the underlying source
long	length() Note that the length will be adjusted to read from the corrected location in the underlying source

Methods inherited from class java.lang.Object

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

Constructor Detail

WindowRandomAccessSource

public WindowRandomAccessSource(RandomAccessSource source,
                                long offset)

Constructs a new OffsetRandomAccessSource that extends to the end of the underlying source

Parameters:

source - the source

offset - the amount of the offset to use

WindowRandomAccessSource

public WindowRandomAccessSource(RandomAccessSource source,
                                long offset,
                                long length)

Constructs a new OffsetRandomAccessSource with an explicit length

Parameters:

source - the source

offset - the amount of the offset to use

length - the number of bytes to be included in this RAS

Method Detail

get

public int get(long position)
        throws IOException

Gets a byte at the specified position Note that the position will be adjusted to read from the corrected location in the underlying source

Specified by:

get in interface RandomAccessSource

Returns:

the byte, or -1 if EOF is reached

Throws:

IOException

get

public int get(long position,
               byte[] bytes,
               int off,
               int len)
        throws IOException

Gets an array at the specified position. If the number of bytes requested cannot be read, the bytes that can be read will be placed in bytes and the number actually read will be returned. Note that the position will be adjusted to read from the corrected location in the underlying source

Specified by:

get in interface RandomAccessSource

Parameters:

position - the position in the RandomAccessSource to read from

bytes - output buffer

off - offset into the output buffer where results will be placed

len - the number of bytes to read

Returns:

the number of bytes actually read, or -1 if the file is at EOF

Throws:

IOException

length

public long length()

Note that the length will be adjusted to read from the corrected location in the underlying source

Specified by:

length in interface RandomAccessSource

Returns:

the length of this source

close

public void close()
           throws IOException

Closes this source. The underlying data structure or source (if any) will also be closed

Specified by:

close in interface RandomAccessSource

Throws:

IOException