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org.jempeg.empeg.core
Class MemorySeekableInputStream  

java.lang.Object
  java.io.InputStream
      org.jempeg.empeg.core.SeekableInputStream
          org.jempeg.empeg.core.MemorySeekableInputStream

All Implemented Interfaces:

java.io.Closeable

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public class MemorySeekableInputStream

extends SeekableInputStream

MemorySeekableInputStream is a an implementation of SeekableInputStream on an array of bytes.

Version:

$Revision: 1.1 $

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Field Summary
private  byte[]	myBytes
private  int	myPosition

 

Constructor Summary

MemorySeekableInputStream(byte[] _bytes)           Constructs a new MemorySeekableInputStream.

 

Method Summary
int	available()           This method returns the number of bytes that can be read from this stream before a read can block.
void	close()           This method closes the stream.
long	length()           Returns the length of this stream.
boolean	markSupported()           This method returns a boolean that indicates whether the mark/reset methods are supported in this class.
int	read()           This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255.
int	read(byte[] _bytes)           This method reads bytes from a stream and stores them into a caller supplied buffer.
int	read(byte[] _bytes, int _offset, int _length)           This method read bytes from a stream and stores them into a caller supplied buffer.
void	reset()           This method resets a stream to the point where the mark() method was called.
void	seek(long _position)           Seeks to the given position in the stream.
long	skip(long _length)           This method skips the specified number of bytes in the stream.
long	tell()           Returns the current position in the stream.

 

Methods inherited from class org.jempeg.empeg.core.SeekableInputStream

readFully, readFully

 

Methods inherited from class java.io.InputStream

mark

 

Methods inherited from class java.lang.Object

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

 

Field Detail

myBytes

private byte[] myBytes

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myPosition

private int myPosition

Constructor Detail

MemorySeekableInputStream

public MemorySeekableInputStream(byte[] _bytes)

Constructs a new MemorySeekableInputStream.

Method Detail

available

public int available()
              throws java.io.IOException

Description copied from class: java.io.InputStream

This method returns the number of bytes that can be read from this stream before a read can block. A return of 0 indicates that blocking might (or might not) occur on the very next read attempt.

This method always returns 0 in this class

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read

public int read()
         throws java.io.IOException

Description copied from class: java.io.InputStream

This method reads an unsigned byte from the input stream and returns it as an int in the range of 0-255. This method also will return -1 if the end of the stream has been reached.

This method will block until the byte can be read.

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read

public int read(byte[] _bytes)
         throws java.io.IOException

Description copied from class: java.io.InputStream

This method reads bytes from a stream and stores them into a caller supplied buffer. This method attempts to completely fill the buffer, but can return before doing so. The actual number of bytes read is returned as an int. A -1 is returned to indicate the end of the stream.

This method will block until some data can be read.

This method operates by calling an overloaded read method like so: read(b, 0, b.length)

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read

public int read(byte[] _bytes,
                int _offset,
                int _length)
         throws java.io.IOException

Description copied from class: java.io.InputStream

This method read bytes from a stream and stores them into a caller supplied buffer. It starts storing the data at index off into the buffer and attempts to read len bytes. This method can return before reading the number of bytes requested. The actual number of bytes read is returned as an int. A -1 is returned to indicate the end of the stream.

This method will block until some data can be read.

This method operates by calling the single byte read() method in a loop until the desired number of bytes are read. The read loop stops short if the end of the stream is encountered or if an IOException is encountered on any read operation except the first. If the first attempt to read a bytes fails, the IOException is allowed to propagate upward. And subsequent IOException is caught and treated identically to an end of stream condition. Subclasses can (and should if possible) override this method to provide a more efficient implementation.

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skip

public long skip(long _length)
          throws java.io.IOException

Description copied from class: java.io.InputStream

This method skips the specified number of bytes in the stream. It returns the actual number of bytes skipped, which may be less than the requested amount.

This method reads and discards bytes into a byte array until the specified number of bytes were skipped or until either the end of stream is reached or a read attempt returns a short count. Subclasses can override this metho to provide a more efficient implementation where one exists.

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reset

public void reset()
           throws java.io.IOException

Description copied from class: java.io.InputStream

This method resets a stream to the point where the mark() method was called. Any bytes that were read after the mark point was set will be re-read during subsequent reads.

This method always throws an IOException in this class, but subclasses can override this method if they provide mark/reset functionality.

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markSupported

public boolean markSupported()

Description copied from class: java.io.InputStream

This method returns a boolean that indicates whether the mark/reset methods are supported in this class. Those methods can be used to remember a specific point in the stream and reset the stream to that point.

This method always returns false in this class, but subclasses can override this method to return true if they support mark/reset functionality.

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close

public void close()
           throws java.io.IOException

Description copied from class: java.io.InputStream

This method closes the stream. Any futher attempts to read from the stream may generate an IOException

This method does nothing in this class, but subclasses may override this method in order to provide additional functionality.

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tell

public long tell()
          throws java.io.IOException

Returns the current position in the stream.

Specified by:

tell in class SeekableInputStream

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seek

public void seek(long _position)
          throws java.io.IOException

Seeks to the given position in the stream.

Specified by:

seek in class SeekableInputStream

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length

public long length()
            throws java.io.IOException

Returns the length of this stream.

Specified by:

length in class SeekableInputStream

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Home >> All >> org >> jempeg >> empeg >> [ core overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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