org.basex.index
Class FTTrie

java.lang.Object
  org.basex.index.Index
      org.basex.index.FTTrie

public final class FTTrie
extends Index

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

Author:

Workgroup DBIS, University of Konstanz 2005-08, ISC License, Christian Gruen, Sebastian Gath

Field Summary

DataAccess

inD FTData on disk.

Constructor Summary

FTTrie(Data d, java.lang.String db)
Constructor, initializing the index structure.

Method Summary

void	close() Close the index.
IndexIterator	ids(IndexToken ind) Returns an iterator for the index results.
byte[]	info() Returns information on the index structure.
int	nrIDs(IndexToken ind) Returns the (approximate/estimated) number of ids for the specified token.

Methods inherited from class java.lang.Object

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

Field Detail

inD

public final DataAccess inD

FTData on disk.

Constructor Detail

FTTrie

public FTTrie(Data d,
              java.lang.String db)
       throws java.io.IOException

Constructor, initializing the index structure.

Parameters:

d - data reference

db - name of the database

Throws:

java.io.IOException - IO Exception

Method Detail

info

public byte[] info()

Description copied from class: Index

Returns information on the index structure.

Specified by:

info in class Index

Returns:

info

nrIDs

public int nrIDs(IndexToken ind)

Description copied from class: Index

Returns the (approximate/estimated) number of ids for the specified token.

Specified by:

nrIDs in class Index

Parameters:

ind - token to be found

Returns:

number of ids

ids

public IndexIterator ids(IndexToken ind)

Description copied from class: Index

Returns an iterator for the index results.

Specified by:

ids in class Index

Parameters:

ind - token to be found

Returns:

ids

close

public void close()
           throws java.io.IOException

Description copied from class: Index

Close the index.

Overrides:

close in class Index

Throws:

java.io.IOException - in case of write errors