cascading.tap.hadoop.io
Class FSDigestInputStream

java.lang.Object
  java.io.InputStream
      org.apache.hadoop.fs.FSInputStream
          cascading.tap.hadoop.io.FSDigestInputStream

All Implemented Interfaces:

Closeable, PositionedReadable, Seekable

public class FSDigestInputStream
extends FSInputStream

Class FSDigestInputStream is an FSInputStream implementation that can verify a MessageDigest and will count the number of bytes read for use in progress status.

Constructor Summary

FSDigestInputStream(InputStream inputStream, MessageDigest messageDigest, String digestHex)
Constructor FSDigestInputStream creates a new FSDigestInputStream instance.

FSDigestInputStream(InputStream inputStream, String digestHex)
Constructor FSDigestInputStream creates a new FSDigestInputStream instance.

Method Summary

void	close()
long	getPos()
int	read()
int	read(byte[] b, int off, int len)
void	seek(long pos)
boolean	seekToNewSource(long targetPos)

Methods inherited from class org.apache.hadoop.fs.FSInputStream

read, readFully, readFully

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

FSDigestInputStream

public FSDigestInputStream(InputStream inputStream,
                           String digestHex)
                    throws IOException

Constructor FSDigestInputStream creates a new FSDigestInputStream instance.

Parameters:

inputStream - of type InputStream

digestHex - of type String

Throws:

IOException - if unable to get md5 digest

FSDigestInputStream

public FSDigestInputStream(InputStream inputStream,
                           MessageDigest messageDigest,
                           String digestHex)

Constructor FSDigestInputStream creates a new FSDigestInputStream instance.

Parameters:

inputStream - of type InputStream

messageDigest - of type MessageDigest

digestHex - of type String

Method Detail

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

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

Overrides:

read in class InputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException

seek

public void seek(long pos)
          throws IOException

Specified by:

seek in interface Seekable

Specified by:

seek in class FSInputStream

Throws:

IOException

getPos

public long getPos()
            throws IOException

Specified by:

getPos in interface Seekable

Specified by:

getPos in class FSInputStream

Throws:

IOException

seekToNewSource

public boolean seekToNewSource(long targetPos)
                        throws IOException

Specified by:

seekToNewSource in interface Seekable

Specified by:

seekToNewSource in class FSInputStream

Throws:

IOException