org.apache.hadoop.tools.rumen

Class RewindableInputStream

java.lang.Object

java.io.InputStream

org.apache.hadoop.tools.rumen.RewindableInputStream

All Implemented Interfaces:

Closeable, AutoCloseable

public class RewindableInputStream
extends InputStream

A simple wrapper class to make any input stream "rewindable". It could be made more memory efficient by grow the internal buffer adaptively.

Constructor Summary

Constructors

Constructor and Description
RewindableInputStream(InputStream input) Constructor.
RewindableInputStream(InputStream input, int maxBytesToRemember) Constructor

Method Summary

Methods

Modifier and Type	Method and Description
void	close()
int	read()
int	read(byte[] buffer, int offset, int length)
InputStream	rewind()

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

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

Constructor Detail

RewindableInputStream

public RewindableInputStream(InputStream input)

Constructor.

Parameters:

input -

RewindableInputStream

public RewindableInputStream(InputStream input,
                     int maxBytesToRemember)

Constructor

Parameters:

input - input stream.

maxBytesToRemember - Maximum number of bytes we need to remember at the beginning of the stream. If rewind() is called after so many bytes are read from the stream, rewind() would fail.

Method Detail

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] buffer,
       int offset,
       int length)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Overrides:

close in class InputStream

Throws:

IOException

rewind

public InputStream rewind()
                   throws IOException

Throws:

IOException