com.sun.media.imageio.stream
Class FileChannelImageOutputStream

java.lang.Object
  |
  +--javax.imageio.stream.ImageInputStreamImpl
        |
        +--javax.imageio.stream.ImageOutputStreamImpl
              |
              +--com.sun.media.imageio.stream.FileChannelImageOutputStream

All Implemented Interfaces:

DataInput, DataOutput, ImageInputStream, ImageOutputStream

public class FileChannelImageOutputStream

extends ImageOutputStreamImpl

A class which implements ImageOutputStream using a FileChannel as the eventual data destination.

Memory mapping is used for reading and direct buffers for writing. Only methods which provide significant performance improvement with respect to the superclass implementation are overridden. Overridden methods are not commented individually unless some noteworthy aspect of the implementation must be described.

The methods of this class are not synchronized.

See Also:

ImageOutputStream, java.nio, FileChannel

Field Summary

Fields inherited from class javax.imageio.stream.ImageInputStreamImpl

bitOffset, byteOrder, flushedPos, streamPos

Constructor Summary

FileChannelImageOutputStream(FileChannel channel)
Constructs a FileChannelImageOutputStream from a FileChannel.

Method Summary

void	close() Invokes the superclass method, writes any unwritten data, and sets the internal reference to the source FileChannel to null.
long	length() Returns the number of bytes currently in the FileChannel.
int	read()
int	read(byte[] b, int off, int len)
void	readFully(char[] c, int off, int len)
void	readFully(double[] d, int off, int len)
void	readFully(float[] f, int off, int len)
void	readFully(int[] i, int off, int len)
void	readFully(long[] l, int off, int len)
void	readFully(short[] s, int off, int len)
void	seek(long pos) Invokes the superclass method, writes any unwritten data, and sets the channel position to the supplied parameter.
void	setByteOrder(ByteOrder networkByteOrder)
void	write(byte[] b, int off, int len)
void	write(int b)
void	writeChars(char[] c, int off, int len)
void	writeDoubles(double[] d, int off, int len)
void	writeFloats(float[] f, int off, int len)
void	writeInts(int[] i, int off, int len)
void	writeLongs(long[] l, int off, int len)
void	writeShorts(short[] s, int off, int len)

Methods inherited from class javax.imageio.stream.ImageOutputStreamImpl

flushBits, write, writeBit, writeBits, writeBoolean, writeByte, writeBytes, writeChar, writeChars, writeDouble, writeFloat, writeInt, writeLong, writeShort, writeUTF

Methods inherited from class javax.imageio.stream.ImageInputStreamImpl

checkClosed, finalize, flush, flushBefore, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, isCached, isCachedFile, isCachedMemory, mark, read, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF, reset, setBitOffset, skipBytes, skipBytes

Methods inherited from class java.lang.Object

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

Methods inherited from interface javax.imageio.stream.ImageOutputStream

flushBefore

Methods inherited from interface javax.imageio.stream.ImageInputStream

flush, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, isCached, isCachedFile, isCachedMemory, mark, read, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF, reset, setBitOffset, skipBytes, skipBytes

Constructor Detail

FileChannelImageOutputStream

public FileChannelImageOutputStream(FileChannel channel)
                             throws IOException

Constructs a FileChannelImageOutputStream from a FileChannel. The initial position of the stream stream is taken to be the position of the FileChannel parameter when this constructor is invoked. The stream and flushed positions are therefore both initialized to channel.position().

Parameters:

channel - the destination FileChannel.

Throws:

IllegalArgumentException - if channel is null or is not open.

IOException - if a method invoked on channel throws an IOException.

Method Detail

read

public int read()
         throws IOException

Specified by:

read in interface ImageInputStream

Specified by:

read in class ImageInputStreamImpl

IOException

read

public int read(byte[] b,
                int off,
                int len)
         throws IOException

Specified by:

read in interface ImageInputStream

Specified by:

read in class ImageInputStreamImpl

IOException

write

public void write(int b)
           throws IOException

Specified by:

write in interface ImageOutputStream

Specified by:

write in class ImageOutputStreamImpl

IOException

write

public void write(byte[] b,
                  int off,
                  int len)
           throws IOException

Specified by:

write in interface ImageOutputStream

Specified by:

write in class ImageOutputStreamImpl

IOException

readFully

public void readFully(char[] c,
                      int off,
                      int len)
               throws IOException

Specified by:

readFully in interface ImageInputStream

Overrides:

readFully in class ImageInputStreamImpl

IOException

readFully

public void readFully(short[] s,
                      int off,
                      int len)
               throws IOException

Specified by:

readFully in interface ImageInputStream

Overrides:

readFully in class ImageInputStreamImpl

IOException

readFully

public void readFully(int[] i,
                      int off,
                      int len)
               throws IOException

Specified by:

readFully in interface ImageInputStream

Overrides:

readFully in class ImageInputStreamImpl

IOException

readFully

public void readFully(long[] l,
                      int off,
                      int len)
               throws IOException

Specified by:

readFully in interface ImageInputStream

Overrides:

readFully in class ImageInputStreamImpl

IOException

readFully

public void readFully(float[] f,
                      int off,
                      int len)
               throws IOException

Specified by:

readFully in interface ImageInputStream

Overrides:

readFully in class ImageInputStreamImpl

IOException

readFully

public void readFully(double[] d,
                      int off,
                      int len)
               throws IOException

Specified by:

readFully in interface ImageInputStream

Overrides:

readFully in class ImageInputStreamImpl

IOException

writeChars

public void writeChars(char[] c,
                       int off,
                       int len)
                throws IOException

Specified by:

writeChars in interface ImageOutputStream

Overrides:

writeChars in class ImageOutputStreamImpl

IOException

writeShorts

public void writeShorts(short[] s,
                        int off,
                        int len)
                 throws IOException

Specified by:

writeShorts in interface ImageOutputStream

Overrides:

writeShorts in class ImageOutputStreamImpl

IOException

writeInts

public void writeInts(int[] i,
                      int off,
                      int len)
               throws IOException

Specified by:

writeInts in interface ImageOutputStream

Overrides:

writeInts in class ImageOutputStreamImpl

IOException

writeLongs

public void writeLongs(long[] l,
                       int off,
                       int len)
                throws IOException

Specified by:

writeLongs in interface ImageOutputStream

Overrides:

writeLongs in class ImageOutputStreamImpl

IOException

writeFloats

public void writeFloats(float[] f,
                        int off,
                        int len)
                 throws IOException

Specified by:

writeFloats in interface ImageOutputStream

Overrides:

writeFloats in class ImageOutputStreamImpl

IOException

writeDoubles

public void writeDoubles(double[] d,
                         int off,
                         int len)
                  throws IOException

Specified by:

writeDoubles in interface ImageOutputStream

Overrides:

writeDoubles in class ImageOutputStreamImpl

IOException

close

public void close()
           throws IOException

Invokes the superclass method, writes any unwritten data, and sets the internal reference to the source FileChannel to null. The source FileChannel is not closed.

Specified by:

close in interface ImageInputStream

Overrides:

close in class ImageInputStreamImpl

Throws:

IOException - if an error occurs.

length

public long length()

Returns the number of bytes currently in the FileChannel. If an IOException is encountered when querying the channel's size, -1L will be returned.

Specified by:

length in interface ImageInputStream

Overrides:

length in class ImageInputStreamImpl

Returns:

The number of bytes in the channel -1L to indicate unknown length.

seek

public void seek(long pos)
          throws IOException

Invokes the superclass method, writes any unwritten data, and sets the channel position to the supplied parameter.

Specified by:

seek in interface ImageInputStream

Overrides:

seek in class ImageInputStreamImpl

IOException

setByteOrder

public void setByteOrder(ByteOrder networkByteOrder)

Specified by:

setByteOrder in interface ImageInputStream

Overrides:

setByteOrder in class ImageInputStreamImpl