org.basex.index
Class WordsCTA

java.lang.Object
  org.basex.index.WordsCTA

All Implemented Interfaces:

Index

public final class WordsCTA
extends java.lang.Object
implements Index

This class indexes text contents in a compressed trie on disk.

Author:

Workgroup DBIS, University of Konstanz 2005-07, ISC License, Christian Gruen, Sebastian Gath

Nested Class Summary

Nested classes/interfaces inherited from interface org.basex.index.Index

Index.TYPE

Field Summary

int	nrIds last/current number of ids.
int	size Number of hash entries.

Constructor Summary

WordsCTA(java.lang.String db, DiskData d)
Constructor, initializing the index structure.

Method Summary

void	close() Close the index.
int[][]	idPos(byte[] tok, FTOption ftO) Returns all ids from trie stored for tok, with repsect to ftO.
int[]	ids(byte[] tok) Returns all ids from trie stored for token.
int[]	ids(byte[] tok, FTOption ftO) Returns all ids from trie stored for tok, with repsect to ftO.
void	info(PrintOutput out) Returns information on the index structure.
int	nrIDs(byte[] tok) Returns the decompressed ids for the specified token.

Methods inherited from class java.lang.Object

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

Field Detail

nrIds

public int nrIds

last/current number of ids.

size

public int size

Number of hash entries.

Constructor Detail

WordsCTA

public WordsCTA(java.lang.String db,
                DiskData d)
         throws java.io.IOException

Constructor, initializing the index structure.

Parameters:

db - name of the database

d - disk data reference

Throws:

java.io.IOException - IO Exception

Method Detail

close

public void close()
           throws java.io.IOException

Close the index.

Specified by:

close in interface Index

Throws:

java.io.IOException - in case of write errors

idPos

public int[][] idPos(byte[] tok,
                     FTOption ftO)

Returns all ids from trie stored for tok, with repsect to ftO.

Specified by:

idPos in interface Index

Parameters:

tok - token to be found

ftO - FTOption for tok

Returns:

number of ids

ids

public int[] ids(byte[] tok)

Returns all ids from trie stored for token.

Specified by:

ids in interface Index

Parameters:

tok - token to be found

Returns:

number of ids

ids

public int[] ids(byte[] tok,
                 FTOption ftO)

Returns all ids from trie stored for tok, with repsect to ftO.

Specified by:

ids in interface Index

Parameters:

tok - token to be found

ftO - FTOption for tok

Returns:

number of ids

info

public void info(PrintOutput out)
          throws java.io.IOException

Returns information on the index structure.

Specified by:

info in interface Index

Parameters:

out - output stream

Throws:

java.io.IOException - in case of write errors

nrIDs

public int nrIDs(byte[] tok)

Returns the decompressed ids for the specified token.

Specified by:

nrIDs in interface Index

Parameters:

tok - token to be found

Returns:

ids