com.twelvemonkeys.io
Class FileSeekableStream

java.lang.Object
  java.io.InputStream
      com.twelvemonkeys.io.SeekableInputStream
          com.twelvemonkeys.io.FileSeekableStream

All Implemented Interfaces:

Seekable, Closeable

public final class FileSeekableStream
extends SeekableInputStream

A SeekableInputStream implementation that uses random access directly to a File.

Version:

$Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/main/java/com/twelvemonkeys/io/FileSeekableStream.java#4 $

Author:

Harald Kuhr

See Also:

FileCacheSeekableStream, MemoryCacheSeekableStream, RandomAccessFile

Field Summary

Fields inherited from class com.twelvemonkeys.io.SeekableInputStream

markedPositions

Constructor Summary

FileSeekableStream(File pInput)
Creates a FileSeekableStream that reads from the given File.

FileSeekableStream(RandomAccessFile pInput)
Creates a FileSeekableStream that reads from the given file.

Method Summary

int	available()
void	closeImpl()
protected void	flushBeforeImpl(long pPosition) Does nothing, as we don't really do any caching here.
boolean	isCached() Returns true if this Seekable stream caches data itself in order to allow seeking backwards.
boolean	isCachedFile() Returns true if this Seekable stream caches data itself in order to allow seeking backwards, and the cache is kept in a temporary file.
boolean	isCachedMemory() Returns true if this Seekable stream caches data itself in order to allow seeking backwards, and the cache is kept in main memory.
int	read()
int	read(byte[] pBytes, int pOffset, int pLength)
protected void	seekImpl(long pPosition)

Methods inherited from class com.twelvemonkeys.io.SeekableInputStream

checkOpen, close, finalize, flush, flushBefore, getFlushedPosition, getStreamPosition, mark, mark, markSupported, read, reset, seek, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

FileSeekableStream

public FileSeekableStream(File pInput)
                   throws FileNotFoundException

Creates a FileSeekableStream that reads from the given File.

Parameters:

pInput - file to read from

Throws:

FileNotFoundException - if pInput does not exist

FileSeekableStream

public FileSeekableStream(RandomAccessFile pInput)

Creates a FileSeekableStream that reads from the given file. The RandomAccessFile needs only to be open in read ("r") mode.

Parameters:

pInput - file to read from

Method Detail

isCached

public boolean isCached()

Description copied from interface: Seekable

Returns true if this Seekable stream caches data itself in order to allow seeking backwards. Applications may consult this in order to decide how frequently, or whether, to flush in order to conserve cache resources.

Returns:

true if this Seekable caches data.

See Also:

Seekable.isCachedMemory(), Seekable.isCachedFile()

isCachedFile

public boolean isCachedFile()

Description copied from interface: Seekable

Returns true if this Seekable stream caches data itself in order to allow seeking backwards, and the cache is kept in a temporary file. Applications may consult this in order to decide how frequently, or whether, to flush in order to conserve cache resources.

Returns:

true if this Seekable caches data in a temporary file.

See Also:

Seekable.isCached(), Seekable.isCachedMemory()

isCachedMemory

public boolean isCachedMemory()

Description copied from interface: Seekable

Returns true if this Seekable stream caches data itself in order to allow seeking backwards, and the cache is kept in main memory. Applications may consult this in order to decide how frequently, or whether, to flush in order to conserve cache resources.

Returns:

true if this Seekable caches data in main memory.

See Also:

Seekable.isCached(), Seekable.isCachedFile()

available

public int available()
              throws IOException

Overrides:

available in class InputStream

Throws:

IOException

closeImpl

public void closeImpl()
               throws IOException

Specified by:

closeImpl in class SeekableInputStream

Throws:

IOException

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] pBytes,
                int pOffset,
                int pLength)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

flushBeforeImpl

protected void flushBeforeImpl(long pPosition)

Does nothing, as we don't really do any caching here.

Specified by:

flushBeforeImpl in class SeekableInputStream

Parameters:

pPosition - the position to flush to

See Also:

SeekableInputStream.flushBefore(long)

seekImpl

protected void seekImpl(long pPosition)
                 throws IOException

Specified by:

seekImpl in class SeekableInputStream

Throws:

IOException