org.terrier.utility
Class FixedSizeInputStream

java.lang.Object
  java.io.InputStream
      java.io.FilterInputStream
          org.terrier.utility.FixedSizeInputStream

All Implemented Interfaces:

java.io.Closeable

public class FixedSizeInputStream
extends java.io.FilterInputStream

An inputstream which only reads a fixed length of a parent input stream. No buffering is done.

Author:

Craig Macdonald

Field Summary

protected long	maxsize maximum bytes to read
protected long	size number of bytes read so far
protected boolean	suppressClose prevent a close() from doing anyhing, like closing the underlying stream

Fields inherited from class java.io.FilterInputStream

in

Constructor Summary

FixedSizeInputStream(java.io.InputStream in, long _maxsize)
create a new FixedSizeInputStream, using in as the underlying InputStream, and maxsize as the maximum number of bytes to read.

Method Summary

void	close()
void	mark(int readAheadLimit)
boolean	markSupported()
int	read() Read a single byte from the underlying Reader.
int	read(byte[] cbuf, int off, int len) Read bytes into a portion of an array.
void	reset()
long	skip(long n) Skips n bytes from the stream.
void	suppressClose() Sets it so that close() will never be called

Methods inherited from class java.io.FilterInputStream

available, read

Methods inherited from class java.lang.Object

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

Field Detail

maxsize

protected final long maxsize

maximum bytes to read

size

protected long size

number of bytes read so far

suppressClose

protected boolean suppressClose

prevent a close() from doing anyhing, like closing the underlying stream

Constructor Detail

FixedSizeInputStream

public FixedSizeInputStream(java.io.InputStream in,
                            long _maxsize)

create a new FixedSizeInputStream, using in as the underlying InputStream, and maxsize as the maximum number of bytes to read.

Parameters:

in - underlying InputStream to read bytes from.

_maxsize - maximum number of bytes to read.

Method Detail

read

public int read()
         throws java.io.IOException

Read a single byte from the underlying Reader.

Overrides:

read in class java.io.FilterInputStream

Returns:

The byte read, or -1 if the end of the underlying stream has been reached or the maximum allowed number of bytes has been read from it.

Throws:

java.io.IOException - If an I/O error occurs.

read

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

Read bytes into a portion of an array.

Overrides:

read in class java.io.FilterInputStream

Parameters:

cbuf - Destination buffer

off - Offset at which to start storing bytes

len - Maximum number of bytes to read

Returns:

The number of bytes read, or -1 if the end of the stream has been reached.

Throws:

java.io.IOException - If an I/O error occurs in the underlying reader.

skip

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

Skips n bytes from the stream. If the end of the stream has been reached before reading n bytes then it returns. NB: This method uses read() internally.

Overrides:

skip in class java.io.FilterInputStream

Parameters:

n - long the number of characters to skip.

Returns:

long the number of characters skipped.

Throws:

java.io.IOException - if there is any error while reading from the stream.

markSupported

public boolean markSupported()

Overrides:

markSupported in class java.io.FilterInputStream

mark

public void mark(int readAheadLimit)

Overrides:

mark in class java.io.FilterInputStream

reset

public void reset()
           throws java.io.IOException

Overrides:

reset in class java.io.FilterInputStream

Throws:

java.io.IOException

suppressClose

public void suppressClose()

Sets it so that close() will never be called

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Overrides:

close in class java.io.FilterInputStream

Throws:

java.io.IOException