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From: =?ks_c_5601-1987?B?sei8usL5KFNlb25nY2hhbiBLaW0p?= <kisckorea@gmail.com>
To: <java-user@lucene.apache.org>
Subject: Query auto completion by using TSTAutocomplete
Date: Mon, 25 Feb 2013 23:53:03 +0900
Message-ID: <000701ce1367$d1e68db0$75b3a910$@gmail.com>
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Hi all,

=20

I am implementing query auto completion by using TSTAutocomplete in =
lucene
3.6.0.

=20

In my understanding, prefixCompletion returns a set of suggestion for
completion. API document says it requires three parameters:

Method:

public ArrayList<TernaryTreeNode> prefixCompletion(TernaryTreeNode root,
CharSequence s, int x)

Parameters:

root - a reference to root node of TST.

s - prefix query to be auto-completed.

x - index of current character to be searched while traversing through =
the
prefix in TST.

Returns:

suggest list of auto-completed keys for the given prefix query.

But I don=A1=AFt know what should I give for =A1=B0root.=A1=B1 Is it =
from my Index?=20

               tst.prefixCompletion(root, str, 10);

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whole codes are following:

=20

import java.io.File;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

=20

import org.apache.lucene.index.IndexReader;

import org.apache.lucene.search.spell.LuceneDictionary;

import org.apache.lucene.search.suggest.Lookup;

import org.apache.lucene.search.suggest.tst.TSTAutocomplete;

import org.apache.lucene.search.suggest.tst.TSTLookup;

import org.apache.lucene.search.suggest.tst.TernaryTreeNode;

import org.apache.lucene.store.FSDirectory;

=20

public class Autocomplete {

=20

        public static void main(String[] args) throws IOException {

=20

               TSTAutocomplete tst =3D new TSTAutocomplete();

               String str =3D "recommen";

=20

               Lookup autoCompleter =3D new TSTLookup();

               FSDirectory dir =3D FSDirectory.open(new File(

                              "d:/workspace/cshare/index/"));

               LuceneDictionary dict =3D new
LuceneDictionary(IndexReader.open(dir),

                              "title_suggest");

               autoCompleter.build(dict);

=20

                ArrayList list =3D tst.prefixCompletion(root, str, 10);

               System.out.println(list);

        }

=20

}

=20

Thank you for your help in advance.

Seongchan.


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