ariba.util.io
Class StatsInputStream

java.lang.Object
  java.io.InputStream
      ariba.util.io.StatsInputStream

All Implemented Interfaces:

Closeable

public class StatsInputStream
extends InputStream

StatsInputStream is an InputStream that keeps track of the number of bytes that have been read in. @see InputStream

Field Summary

long	count Number of bytes read.

Constructor Summary

StatsInputStream(InputStream base)
Creates a StatsInputStream.

Method Summary

int	available() Returns the number of bytes that can be read without blocking.
void	close() Closes the input stream.
void	mark(int readlimit) Marks the current position in the input stream.
boolean	markSupported() Returns a boolean indicating whether or not this stream type supports mark/reset.
int	read() Reads a byte of data.
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 n bytes of input.

Methods inherited from class java.lang.Object

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

Field Detail

count

public long count

Number of bytes read.

Constructor Detail

StatsInputStream

public StatsInputStream(InputStream base)

Creates a StatsInputStream.

Parameters:

base - the InputStream

Method Detail

read

public int read()
         throws IOException

Reads a byte of data.

Specified by:

read in class InputStream

Returns:

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

Throws:

IOException - If an I/O error has occurred.

read

public int read(byte[] b)
         throws IOException

Reads into an array of bytes. This method will block until some input is available.

Overrides:

read in class InputStream

Parameters:

b - the buffer into which the data is read

Returns:

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

Throws:

IOException - If an I/O error has occurred.

read

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

Reads into an array of bytes. This method will block until some input is available.

Overrides:

read in class InputStream

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, -1 is returned when the end of the stream is reached.

Throws:

IOException - If an I/O error has occurred.

skip

public long skip(long n)
          throws IOException

Skips n bytes of input. We count skipped bytes as "read" in the count field.

Overrides:

skip in class InputStream

Parameters:

n - the number of bytes to be skipped

Returns:

the actual number of bytes skipped.

Throws:

IOException - If an I/O error has occurred.

available

public int available()
              throws IOException

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

Overrides:

available in class InputStream

Returns:

the number of available bytes.

Throws:

IOException

close

public void close()
           throws IOException

Closes the input stream. Must be called to release any resources associated with the stream.

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException - If an I/O error has occurred.

mark

public 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.

Overrides:

mark in class InputStream

Parameters:

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

reset

public void reset()
           throws 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 parser, it just chugs along happily. If the stream is not of that type, the parser should toss an exception when it fails, which, if it happens within readlimit bytes, allows the outer code to reset the stream and try another parser.

Overrides:

reset in class InputStream

Throws:

IOException - If the stream has not been marked or if the mark has been invalidated.

markSupported

public boolean markSupported()

Returns a boolean indicating whether or not this stream type supports mark/reset.

Overrides:

markSupported in class InputStream

Returns:

true if this stream type supports mark/reset; false otherwise.