Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> ydp >> [ jai overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---

org.ydp.jai
Class FileSeekableStream  

java.lang.Object
  java.io.InputStream
      org.ydp.jai.SeekableStream
          org.ydp.jai.FileSeekableStream

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput

---

public class FileSeekableStream

extends SeekableStream

A subclass of SeekableStream that takes its input from a File or RandomAccessFile. Backwards seeking is supported. The mark() and resest() methods are supported.

This class is not a committed part of the JAI API. It may be removed or changed in future releases of JAI.

---

Field Summary
private  int[]	currentPage
private  java.io.RandomAccessFile	file
private  long	length
private  long	markPos
private static int	NUM_PAGES
private static int	PAGE_MASK
private static int	PAGE_SHIFT
private static int	PAGE_SIZE
private  byte[][]	pageBuf
private  long	pointer
private static int	READ_CACHE_LIMIT

 

Fields inherited from class org.ydp.jai.SeekableStream

 

Constructor Summary

FileSeekableStream(java.io.File file)           Constructs a FileSeekableStream from a File.

FileSeekableStream(java.io.RandomAccessFile file)           Constructs a FileSeekableStream from a RandomAccessFile.

FileSeekableStream(java.lang.String name)           Constructs a FileSeekableStream from a String path name.

 

Method Summary
boolean	canSeekBackwards()           Returns true since seeking backwards is supported.
void	close()           Forwards the request to the real File.
long	getFilePointer()           Returns the current offset in this stream.
void	mark(int readLimit)           Marks the current file position for later return using the reset() method.
boolean	markSupported()           Returns true since marking is supported.
int	read()           Forwards the request to the real File.
int	read(byte[] b, int off, int len)           Forwards the request to the real File.
private  byte[]	readPage(long pointer)
void	reset()           Returns the file position to its position at the time of the immediately previous call to the mark() method.
void	seek(long pos)           Sets the offset, measured from the beginning of this stream, at which the next read occurs.
int	skip(int n)

 

Methods inherited from class org.ydp.jai.SeekableStream

finalize, readBoolean, readByte, readChar, readCharLE, readDouble, readDoubleLE, readFloat, readFloatLE, readFully, readFully, readInt, readIntLE, readLine, readLong, readLongLE, readShort, readShortLE, readUnsignedByte, readUnsignedInt, readUnsignedIntLE, readUnsignedShort, readUnsignedShortLE, readUTF, skipBytes, wrapInputStream

 

Methods inherited from class java.io.InputStream

available, read, skip

 

Methods inherited from class java.lang.Object

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

 

Field Detail

file

private java.io.RandomAccessFile file

---

markPos

private long markPos

---

PAGE_SHIFT

private static final int PAGE_SHIFT

See Also:

Constant Field Values

---

PAGE_SIZE

private static final int PAGE_SIZE

See Also:

Constant Field Values

---

PAGE_MASK

private static final int PAGE_MASK

See Also:

Constant Field Values

---

NUM_PAGES

private static final int NUM_PAGES

See Also:

Constant Field Values

---

READ_CACHE_LIMIT

private static final int READ_CACHE_LIMIT

See Also:

Constant Field Values

---

pageBuf

private byte[][] pageBuf

---

currentPage

private int[] currentPage

---

length

private long length

---

pointer

private long pointer

Constructor Detail

FileSeekableStream

public FileSeekableStream(java.io.RandomAccessFile file)
                   throws java.io.IOException

Constructs a FileSeekableStream from a RandomAccessFile.

---

FileSeekableStream

public FileSeekableStream(java.io.File file)
                   throws java.io.IOException

Constructs a FileSeekableStream from a File.

---

FileSeekableStream

public FileSeekableStream(java.lang.String name)
                   throws java.io.IOException

Constructs a FileSeekableStream from a String path name.

Method Detail

canSeekBackwards

public final boolean canSeekBackwards()

Returns true since seeking backwards is supported.

Overrides:

canSeekBackwards in class SeekableStream

---

getFilePointer

public final long getFilePointer()
                          throws java.io.IOException

Returns the current offset in this stream.

Specified by:

getFilePointer in class SeekableStream

---

seek

public final void seek(long pos)
                throws java.io.IOException

Description copied from class: SeekableStream

Sets the offset, measured from the beginning of this stream, at which the next read occurs.

If canSeekBackwards() returns false, then setting pos to an offset smaller than the current value of getFilePointer() will have no effect.

Specified by:

seek in class SeekableStream

---

skip

public final int skip(int n)
               throws java.io.IOException

---

readPage

private byte[] readPage(long pointer)
                 throws java.io.IOException

---

read

public final int read()
               throws java.io.IOException

Forwards the request to the real File.

Specified by:

read in class SeekableStream

---

read

public final int read(byte[] b,
                      int off,
                      int len)
               throws java.io.IOException

Forwards the request to the real File.

Specified by:

read in class SeekableStream

---

close

public final void close()
                 throws java.io.IOException

Forwards the request to the real File.

---

mark

public final void mark(int readLimit)

Marks the current file position for later return using the reset() method.

Overrides:

mark in class SeekableStream

---

reset

public final void reset()
                 throws java.io.IOException

Returns the file position to its position at the time of the immediately previous call to the mark() method.

Overrides:

reset in class SeekableStream

---

markSupported

public boolean markSupported()

Returns true since marking is supported.

Overrides:

markSupported in class SeekableStream

---

Overview  Package   Class  Use  Deprecated  Index
Home >> All >> org >> ydp >> [ jai overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

---