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SUMMARY: JavaDoc of gnu.java.nio.channels.FileChannelImpl JAVADOC | Sourc code of gnu.java.nio.channels.FileChannelImpl SOURCE | Download gnu.java.nio.channels.FileChannelImpl DOWNLOAD | NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD

gnu.java.nio.channels
Class FileChannelImpl  view FileChannelImpl download FileChannelImpl.java

java.lang.Object
  extended byjava.nio.channels.spi.AbstractInterruptibleChannel
      extended byjava.nio.channels.FileChannel
          extended bygnu.java.nio.channels.FileChannelImpl
All Implemented Interfaces:
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 final class FileChannelImpl
extends java.nio.channels.FileChannel

This file is not user visible ! But alas, Java does not have a concept of friendly packages so this class is public. Instances of this class are created by invoking getChannel Upon a Input/Output/RandomAccessFile object.

Nested Class Summary
 
Nested classes inherited from class java.nio.channels.FileChannel
java.nio.channels.FileChannel.MapMode
 
Field Summary
static int APPEND
           
(package private)  java.lang.String description
           
static int DSYNC
           
static FileChannelImpl err
           
static int EXCL
           
private  int fd
          This is the actual native file descriptor value
static FileChannelImpl in
           
private  int mode
           
static FileChannelImpl out
           
static int READ
           
static int SYNC
           
static int WRITE
           
 
Fields inherited from class java.nio.channels.spi.AbstractInterruptibleChannel
 
Constructor Summary
private FileChannelImpl(java.io.File file, int mode)
           
(package private) FileChannelImpl(int fd, int mode)
          Constructor for default channels in, out and err.
 
Method Summary
 int available()
           
static FileChannelImpl create(java.io.File file, int mode)
           
protected  void finalize()
          Makes sure the Channel is properly closed.
private  void force()
           
 void force(boolean metaData)
          msync with the disk
protected  void implCloseChannel()
          Closes the channel.
private  long implPosition()
           
private  void implTruncate(long size)
           
private static void init()
           
 java.nio.channels.FileLock lock(long position, long size, boolean shared)
          Creates a file lock for a region of the associated file.
private  boolean lock(long position, long size, boolean shared, boolean wait)
          Try to acquire a lock at the given position and size.
private  void lockCheck(long position, long size, boolean shared)
           
 java.nio.MappedByteBuffer map(java.nio.channels.FileChannel.MapMode mode, long position, long size)
          Maps the file into the memory.
 java.nio.MappedByteBuffer mapImpl(char mode, long position, int size)
           
private  int open(java.lang.String path, int mode)
           
 long position()
          Returns the current position on the file.
 java.nio.channels.FileChannel position(long newPosition)
          Sets the position of the channel on the assoziated file.
 int read()
           
 int read(byte[] buffer, int offset, int length)
           
 int read(java.nio.ByteBuffer dst)
          Reads data from the channel.
 long read(java.nio.ByteBuffer[] dsts, int offset, int length)
          Reads data from the channel.
 int read(java.nio.ByteBuffer dst, long position)
          Reads data from the channel.
private  void seek(long newPosition)
           
 long size()
          Return the size of the file thus far
private  int smallTransferFrom(java.nio.channels.ReadableByteChannel src, long position, int count)
           
private  int smallTransferTo(long position, int count, java.nio.channels.WritableByteChannel target)
           
 java.lang.String toString()
          Convert this Object to a human-readable String.
 long transferFrom(java.nio.channels.ReadableByteChannel src, long position, long count)
          Transfers bytes from the given readable channel into this channel.
 long transferTo(long position, long count, java.nio.channels.WritableByteChannel target)
          Transfers bytes from this channel's file to the given writable byte channel.
 java.nio.channels.FileChannel truncate(long size)
          Truncates the channel's file at size.
 java.nio.channels.FileLock tryLock(long position, long size, boolean shared)
          Tries to aqquire a lock on a region of the associated file.
 void unlock(long pos, long len)
           
 void write(byte[] buffer, int offset, int length)
           
 int write(java.nio.ByteBuffer src)
          Writes data to the channel.
 long write(java.nio.ByteBuffer[] srcs, int offset, int length)
          Writes data to the channel.
 int write(java.nio.ByteBuffer src, long position)
          Writes data to the channel.
 void write(int b)
           
 
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, getClass, hashCode, notify, notifyAll, wait, wait, wait
 
Methods inherited from interface java.nio.channels.Channel
close, isOpen
 

Field Detail

READ

public static final int READ
See Also:
Constant Field Values

WRITE

public static final int WRITE
See Also:
Constant Field Values

APPEND

public static final int APPEND
See Also:
Constant Field Values

EXCL

public static final int EXCL
See Also:
Constant Field Values

SYNC

public static final int SYNC
See Also:
Constant Field Values

DSYNC

public static final int DSYNC
See Also:
Constant Field Values

in

public static FileChannelImpl in

out

public static FileChannelImpl out

err

public static FileChannelImpl err

fd

private int fd
This is the actual native file descriptor value

mode

private int mode

description

final java.lang.String description
Constructor Detail

FileChannelImpl

private FileChannelImpl(java.io.File file,
                        int mode)
                 throws java.io.FileNotFoundException

FileChannelImpl

FileChannelImpl(int fd,
                int mode)
Constructor for default channels in, out and err. Used by init() (native code).

Method Detail

init

private static void init()

create

public static FileChannelImpl create(java.io.File file,
                                     int mode)
                              throws java.io.FileNotFoundException

open

private int open(java.lang.String path,
                 int mode)
          throws java.io.FileNotFoundException

available

public int available()
              throws java.io.IOException

implPosition

private long implPosition()
                   throws java.io.IOException

seek

private void seek(long newPosition)
           throws java.io.IOException

implTruncate

private void implTruncate(long size)
                   throws java.io.IOException

unlock

public void unlock(long pos,
                   long len)
            throws java.io.IOException

size

public long size()
          throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Return the size of the file thus far

implCloseChannel

protected void implCloseChannel()
                         throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Closes the channel. This is called from @see close.

finalize

protected void finalize()
                 throws java.io.IOException
Makes sure the Channel is properly closed.

read

public int read(java.nio.ByteBuffer dst)
         throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Reads data from the channel.

read

public int read(java.nio.ByteBuffer dst,
                long position)
         throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Reads data from the channel.

read

public int read()
         throws java.io.IOException

read

public int read(byte[] buffer,
                int offset,
                int length)
         throws java.io.IOException

read

public long read(java.nio.ByteBuffer[] dsts,
                 int offset,
                 int length)
          throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Reads data from the channel.

write

public int write(java.nio.ByteBuffer src)
          throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Writes data to the channel.

write

public int write(java.nio.ByteBuffer src,
                 long position)
          throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Writes data to the channel.

write

public void write(byte[] buffer,
                  int offset,
                  int length)
           throws java.io.IOException

write

public void write(int b)
           throws java.io.IOException

write

public long write(java.nio.ByteBuffer[] srcs,
                  int offset,
                  int length)
           throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Writes data to the channel.

mapImpl

public java.nio.MappedByteBuffer mapImpl(char mode,
                                         long position,
                                         int size)
                                  throws java.io.IOException

map

public java.nio.MappedByteBuffer map(java.nio.channels.FileChannel.MapMode mode,
                                     long position,
                                     long size)
                              throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Maps the file into the memory.

force

public void force(boolean metaData)
           throws java.io.IOException
msync with the disk

force

private void force()

smallTransferTo

private int smallTransferTo(long position,
                            int count,
                            java.nio.channels.WritableByteChannel target)
                     throws java.io.IOException

transferTo

public long transferTo(long position,
                       long count,
                       java.nio.channels.WritableByteChannel target)
                throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Transfers bytes from this channel's file to the given writable byte channel.

smallTransferFrom

private int smallTransferFrom(java.nio.channels.ReadableByteChannel src,
                              long position,
                              int count)
                       throws java.io.IOException

transferFrom

public long transferFrom(java.nio.channels.ReadableByteChannel src,
                         long position,
                         long count)
                  throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Transfers bytes from the given readable channel into this channel.

lockCheck

private void lockCheck(long position,
                       long size,
                       boolean shared)
                throws java.io.IOException

tryLock

public java.nio.channels.FileLock tryLock(long position,
                                          long size,
                                          boolean shared)
                                   throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Tries to aqquire a lock on a region of the associated file.

lock

private boolean lock(long position,
                     long size,
                     boolean shared,
                     boolean wait)
              throws java.io.IOException
Try to acquire a lock at the given position and size. On success return true. If wait as specified, block until we can get it. Otherwise return false.

lock

public java.nio.channels.FileLock lock(long position,
                                       long size,
                                       boolean shared)
                                throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Creates a file lock for a region of the associated file.

position

public long position()
              throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Returns the current position on the file.

position

public java.nio.channels.FileChannel position(long newPosition)
                                       throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Sets the position of the channel on the assoziated file.

truncate

public java.nio.channels.FileChannel truncate(long size)
                                       throws java.io.IOException
Description copied from class: java.nio.channels.FileChannel
Truncates the channel's file at size.

toString

public java.lang.String toString()
Description copied from class: java.lang.Object
Convert this Object to a human-readable String. There are no limits placed on how long this String should be or what it should contain. We suggest you make it as intuitive as possible to be able to place it into System.out.println() 55 and such.

It is typical, but not required, to ensure that this method never completes abruptly with a java.lang.RuntimeException.

This method will be called when performing string concatenation with this object. If the result is null, string concatenation will instead use "null".

The default implementation returns getClass().getName() + "@" + Integer.toHexString(hashCode()).

Overview  Package   Class  Use  Deprecated  Index 
Home >> All >> gnu >> java >> nio >> [ channels overview ]  PREV CLASS  NEXT CLASS
SUMMARY: JavaDoc of gnu.java.nio.channels.FileChannelImpl JAVADOC | Sourc code of gnu.java.nio.channels.FileChannelImpl SOURCE | Download gnu.java.nio.channels.FileChannelImpl DOWNLOAD | NESTED | FIELD | CONSTR | METHOD DETAIL: FIELD | CONSTR | METHOD