jwutil.io
Class MyFileChannelImpl

java.lang.Object
  java.nio.channels.spi.AbstractInterruptibleChannel
      java.nio.channels.FileChannel
          jwutil.io.MyFileChannelImpl

All Implemented Interfaces:

java.io.Closeable, java.nio.channels.ByteChannel, java.nio.channels.Channel, java.nio.channels.GatheringByteChannel, java.nio.channels.InterruptibleChannel, java.nio.channels.ReadableByteChannel, java.nio.channels.ScatteringByteChannel, java.nio.channels.WritableByteChannel

public class MyFileChannelImpl
extends java.nio.channels.FileChannel
implements java.nio.channels.ReadableByteChannel, java.nio.channels.WritableByteChannel

An implementation of FileChannel that is backed by a FileInputStream, FileOutputStream, or RandomAccessFile. This is useful on virtual machines that do not support the normal FileChannel methods (like JDK 1.3). Not all functionality has been implemented yet.

Version:

$Id: MyFileChannelImpl.java 2279 2005-05-28 10:24:54Z joewhaley $

Author:

John Whaley

Nested Class Summary

Nested classes/interfaces inherited from class java.nio.channels.FileChannel

java.nio.channels.FileChannel.MapMode

Field Summary

protected long	currentPosition
protected java.io.FileInputStream	fis
protected java.io.FileOutputStream	fos
protected java.io.RandomAccessFile	raf

Method Summary

void	force(boolean arg0)
static java.nio.channels.FileChannel	getFileChannel(java.lang.Object o) Gets the file channel for the given object.
protected void	implCloseChannel()
java.nio.channels.FileLock	lock(long arg0, long arg1, boolean arg2)
java.nio.MappedByteBuffer	map(java.nio.channels.FileChannel.MapMode arg0, long arg1, long arg2)
long	position()
java.nio.channels.FileChannel	position(long arg0)
int	read(java.nio.ByteBuffer b)
long	read(java.nio.ByteBuffer[] b, int offset, int length)
int	read(java.nio.ByteBuffer arg0, long arg1)
long	size()
long	transferFrom(java.nio.channels.ReadableByteChannel arg0, long arg1, long arg2)
long	transferTo(long arg0, long arg1, java.nio.channels.WritableByteChannel arg2)
java.nio.channels.FileChannel	truncate(long arg0)
java.nio.channels.FileLock	tryLock(long arg0, long arg1, boolean arg2)
int	write(java.nio.ByteBuffer b)
long	write(java.nio.ByteBuffer[] b, int offset, int length)
int	write(java.nio.ByteBuffer arg0, long arg1)

Methods inherited from class java.nio.channels.FileChannel

lock, read, tryLock, write

Methods inherited from class java.nio.channels.spi.AbstractInterruptibleChannel

begin, close, end, isOpen

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.nio.channels.Channel

close, isOpen

Methods inherited from interface java.nio.channels.Channel

close, isOpen

Field Detail

fis

protected java.io.FileInputStream fis

fos

protected java.io.FileOutputStream fos

raf

protected java.io.RandomAccessFile raf

currentPosition

protected long currentPosition

Method Detail

getFileChannel

public static java.nio.channels.FileChannel getFileChannel(java.lang.Object o)
                                                    throws java.io.IOException

Gets the file channel for the given object. Assumes the object either has a getChannel() method, or it is a FileInputStream, FileOutputStream, or RandomAccessFile.

Parameters:

o - object to get file channel from

Returns:

the file channel

Throws:

java.io.IOException - if an IO exception occurred while getting the channel

read

public int read(java.nio.ByteBuffer b)
         throws java.io.IOException

Specified by:

read in interface java.nio.channels.ReadableByteChannel

Specified by:

read in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

ReadableByteChannel.read(ByteBuffer)

read

public long read(java.nio.ByteBuffer[] b,
                 int offset,
                 int length)
          throws java.io.IOException

Specified by:

read in interface java.nio.channels.ScatteringByteChannel

Specified by:

read in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

ScatteringByteChannel.read(ByteBuffer[], int, int)

write

public int write(java.nio.ByteBuffer b)
          throws java.io.IOException

Specified by:

write in interface java.nio.channels.WritableByteChannel

Specified by:

write in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

WritableByteChannel.write(ByteBuffer)

write

public long write(java.nio.ByteBuffer[] b,
                  int offset,
                  int length)
           throws java.io.IOException

Specified by:

write in interface java.nio.channels.GatheringByteChannel

Specified by:

write in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

GatheringByteChannel.write(ByteBuffer[], int, int)

position

public long position()
              throws java.io.IOException

Specified by:

position in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.position()

position

public java.nio.channels.FileChannel position(long arg0)
                                       throws java.io.IOException

Specified by:

position in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.position(long)

size

public long size()
          throws java.io.IOException

Specified by:

size in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.size()

truncate

public java.nio.channels.FileChannel truncate(long arg0)
                                       throws java.io.IOException

Specified by:

truncate in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.truncate(long)

force

public void force(boolean arg0)
           throws java.io.IOException

Specified by:

force in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.force(boolean)

read

public int read(java.nio.ByteBuffer arg0,
                long arg1)
         throws java.io.IOException

Specified by:

read in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.read(ByteBuffer, long)

write

public int write(java.nio.ByteBuffer arg0,
                 long arg1)
          throws java.io.IOException

Specified by:

write in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.write(ByteBuffer, long)

implCloseChannel

protected void implCloseChannel()
                         throws java.io.IOException

Specified by:

implCloseChannel in class java.nio.channels.spi.AbstractInterruptibleChannel

Throws:

java.io.IOException

See Also:

AbstractInterruptibleChannel.implCloseChannel()

transferFrom

public long transferFrom(java.nio.channels.ReadableByteChannel arg0,
                         long arg1,
                         long arg2)
                  throws java.io.IOException

Specified by:

transferFrom in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.transferFrom(ReadableByteChannel, long, long)

transferTo

public long transferTo(long arg0,
                       long arg1,
                       java.nio.channels.WritableByteChannel arg2)
                throws java.io.IOException

Specified by:

transferTo in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.transferTo(long, long, WritableByteChannel)

lock

public java.nio.channels.FileLock lock(long arg0,
                                       long arg1,
                                       boolean arg2)
                                throws java.io.IOException

Specified by:

lock in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.lock(long, long, boolean)

map

public java.nio.MappedByteBuffer map(java.nio.channels.FileChannel.MapMode arg0,
                                     long arg1,
                                     long arg2)
                              throws java.io.IOException

Specified by:

map in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.map(MapMode, long, long)

tryLock

public java.nio.channels.FileLock tryLock(long arg0,
                                          long arg1,
                                          boolean arg2)
                                   throws java.io.IOException

Specified by:

tryLock in class java.nio.channels.FileChannel

Throws:

java.io.IOException

See Also:

FileChannel.tryLock(long, long, boolean)