edu.umn.cs.spatialHadoop.io

Class RandomCompressedInputStream

java.lang.Object

java.io.InputStream

edu.umn.cs.spatialHadoop.io.RandomCompressedInputStream

All Implemented Interfaces:

java.io.Closeable, java.lang.AutoCloseable

public class RandomCompressedInputStream
extends java.io.InputStream

Provides random access to a file that was previously written using RandomCompressedOutputStream. The underlying stream should be seekable and the total size of it should be known because the lookup table that helps doing the random access is stored at the very end.

Author:

Ahmed Eldawy

Constructor Summary

Constructors

Constructor and Description
RandomCompressedInputStream(FileSystem fs, Path p)
RandomCompressedInputStream(FSDataInputStream in, long totalLength)

Method Summary

Methods

Modifier and Type	Method and Description
int	available()
void	close()
long	getPos()
int	read()
int	read(long position, byte[] buffer, int offset, int length)
void	readFully(long position, byte[] buffer)
void	readFully(long position, byte[] buffer, int offset, int length)
void	seek(long newPos)
boolean	seekToNewSource(long newPos)
long	skip(long n)

Methods inherited from class java.io.InputStream

mark, markSupported, read, read, reset

Methods inherited from class java.lang.Object

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

Constructor Detail

RandomCompressedInputStream

public RandomCompressedInputStream(FileSystem fs,
                           Path p)
                            throws java.io.IOException

Throws:

java.io.IOException

RandomCompressedInputStream

public RandomCompressedInputStream(FSDataInputStream in,
                           long totalLength)
                            throws java.io.IOException

Throws:

java.io.IOException

Method Detail

getPos

public long getPos()
            throws java.io.IOException

Throws:

java.io.IOException

seek

public void seek(long newPos)
          throws java.io.IOException

Throws:

java.io.IOException

seekToNewSource

public boolean seekToNewSource(long newPos)
                        throws java.io.IOException

Throws:

java.io.IOException

read

public int read()
         throws java.io.IOException

Specified by:

read in class java.io.InputStream

Throws:

java.io.IOException

skip

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

Overrides:

skip in class java.io.InputStream

Throws:

java.io.IOException

close

public void close()
           throws java.io.IOException

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

Throws:

java.io.IOException

read

public int read(long position,
       byte[] buffer,
       int offset,
       int length)
         throws java.io.IOException

Throws:

java.io.IOException

readFully

public void readFully(long position,
             byte[] buffer,
             int offset,
             int length)
               throws java.io.IOException

Throws:

java.io.IOException

readFully

public void readFully(long position,
             byte[] buffer)
               throws java.io.IOException

Throws:

java.io.IOException

available

public int available()
              throws java.io.IOException

Overrides:

available in class java.io.InputStream

Throws:

java.io.IOException