com.sun.jimi.core.decoder.png
Class MeteredInputStream

java.lang.Object
  |
  +--java.io.InputStream
        |
        +--java.io.FilterInputStream
              |
              +--com.sun.jimi.core.decoder.png.MeteredInputStream

public class MeteredInputStream

extends java.io.FilterInputStream

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

MeteredInputStream(java.io.InputStream in, int size)

Method Summary

int	available() Returns the number of bytes that can be read without blocking.
void	close() Does NOT close the input stream.
void	mark(int readlimit) Marks the current position in the input stream.
boolean	markSupported() Returns true if this stream type supports mark/reset.
int	read() Reads a byte.
int	read(byte[] b) Reads into an array of bytes.
int	read(byte[] b, int off, int len) Reads into an array of bytes.
void	reset() Repositions the stream to the last marked position.
long	skip(long n) Skips bytes of input.

Methods inherited from class java.lang.Object

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

Constructor Detail

MeteredInputStream

public MeteredInputStream(java.io.InputStream in,
                          int size)

Method Detail

read

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

Reads a byte. Will block if no input is available.

Returns:

the byte read, or -1 if the end of the stream is reached.

Throws:

java.io.IOException - If an I/O error has occurred.

Overrides:

read in class java.io.FilterInputStream

read

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

Reads into an array of bytes. Blocks until some input is available.

Parameters:

b - the buffer into which the data is read

Returns:

the actual number of bytes read. Returns -1 when the end of the stream is reached.

Throws:

java.io.IOException - If an I/O error has occurred.

Overrides:

read in class java.io.FilterInputStream

read

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

Reads into an array of bytes. Blocks until some input is available. This method should be overridden in a subclass for efficiency (the default implementation reads 1 byte at a time).

Parameters:

b - the buffer into which the data is read

off - the start offset of the data

len - the maximum number of bytes read

Returns:

the actual number of bytes read. Returns -1 when the end of the stream is reached.

Throws:

java.io.IOException - If an I/O error has occurred.

Overrides:

read in class java.io.FilterInputStream

skip

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

Skips bytes of input.

Parameters:

n - bytes to be skipped

Returns:

actual number of bytes skipped

Throws:

java.io.IOException - If an I/O error has occurred.

Overrides:

skip in class java.io.FilterInputStream

available

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

Returns the number of bytes that can be read without blocking.

Returns:

the number of available bytes

Overrides:

available in class java.io.FilterInputStream

close

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

Does NOT close the input stream. More data is to be expected

Throws:

java.io.IOException - If an I/O error has occurred.

Overrides:

close in class java.io.FilterInputStream

mark

public final void mark(int readlimit)

Marks the current position in the input stream. A subsequent call to reset() will reposition the stream at the last marked position so that subsequent reads will re-read the same bytes. The stream promises to allow readlimit bytes to be read before the mark position gets invalidated.

Parameters:

readlimit - the maximum limit of bytes allowed tobe read before the mark position becomes invalid.

Overrides:

mark in class java.io.FilterInputStream

reset

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

Repositions the stream to the last marked position. If the stream has not been marked, or if the mark has been invalidated, an IOException is thrown. Stream marks are intended to be used in situations where you need to read ahead a little to see what's in the stream. Often this is most easily done by invoking some general parser. If the stream is of the type handled by the parse, it just chugs along happily. If the stream is not of that type, the parser should toss an exception when it fails. If this happens within readlimit bytes, it allows the outer code to reset the stream and try another parser.

Overrides:

reset in class java.io.FilterInputStream

markSupported

public final boolean markSupported()

Returns true if this stream type supports mark/reset.

Overrides:

markSupported in class java.io.FilterInputStream