Re: Help on Phrase Prefix query

[Mahendra]

Hi Erik,

Thanks for responding. I have attached a sample java file for the
sample implementation.


-regards,
mahendra


On Mon, 6 Dec 2004 08:19:54 -0500, Erik Hatcher
<[EMAIL PROTECTED]> wrote:
> Mahendra,
> 
> Could you provide a concrete, and simple, example of what you're trying
> to achieve?  It would help me understand what you're after.
> 
> Any Query implementation works fine as a clause within a BooleanQuery,
> there is nothing special to do for a PhrasePrefixQuery in this regard.
> 
>        Erik
> 
> 
> 
> 
> On Dec 6, 2004, at 6:34 AM, Mahendra wrote:
> 
> > Hi,
> >
> > Presently i am working on a requirement in my application, to do the
> > search using lucene as follows,
> >
> > Users enters phrase prefix query text. The query should be constructed
> > as follows,
> > - a PhrasePrefixQuery based on the user entered text,  for eg FieldA
> > - a termquery based on another field, for eg FieldB
> > - a boolean query is constructed based on the above two queries.
> >
> > The search based on the boolean query, does not yield any results.
> > However, query based on PhrasePrefixQuery and TermQuery is returning
> > results. Can anyone suggest how
> > to use PhrasePrefixQuery as part of Booleanquery.
> >
> > -Thanks,
> > Mahendra
> >
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package org.apache.lucene.search;

/**
 * Copyright 2004 The Apache Software Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermEnum;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.analysis.SimpleAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;

import junit.framework.TestCase;

import java.io.IOException;
import java.util.LinkedList;

/**
 * This class tests PhrasePrefixQuery class.
 *
 * @author Otis Gospodnetic
 * @version $Id: TestPhrasePrefixQuery.java,v 1.3 2004/03/29 22:48:06 cutting Exp $
 */
public class TestPhrasePrefixQuery
    extends TestCase
{
    public TestPhrasePrefixQuery(String name)
    {
        super(name);
    }

    /**
     *
     */
    public void testPhrasePrefix()
        throws IOException
    {
        RAMDirectory indexStore = new RAMDirectory("D:\\bea81\\user_projects\\domains\\masdomain\\mas\\index");
        IndexWriter writer = new IndexWriter(indexStore, new SimpleAnalyzer(), true);
		/*
        Document doc1 = new Document();
        Document doc2 = new Document();
        Document doc3 = new Document();
        Document doc4 = new Document();
        Document doc5 = new Document();
        doc1.add(Field.Text("text", "blueberry pie"));
        doc2.add(Field.Text("body", "blueberry strudel"));
        doc3.add(Field.Text("body", "blueberry pizza"));
        doc4.add(Field.Text("body", "blueberry chewing gum"));
        doc5.add(Field.Text("body", "piccadilly circus"));
        writer.addDocument(doc1);
        writer.addDocument(doc2);
        writer.addDocument(doc3);
        writer.addDocument(doc4);
        writer.addDocument(doc5);
        writer.optimize();
        writer.close();

		*/
		IndexSearcher searcher = new IndexSearcher("D:\\bea81\\user_projects\\domains\\masdomain\\mas\\index");

        PhrasePrefixQuery query1 = new PhrasePrefixQuery();
        PhrasePrefixQuery query2 = new PhrasePrefixQuery();
        query1.add(new Term("text", "contracts"));
        query2.add(new Term("text", "contracts"));

        LinkedList termsWithPrefix = new LinkedList();
        IndexReader ir = IndexReader.open("D:\\bea81\\user_projects\\domains\\masdomain\\mas\\index");

        TermEnum te = ir.terms(new Term("text", "appl*"));
        do {
            if (te.term().text().startsWith("appl"))
            {
                termsWithPrefix.add(te.term());
            }
        } while (te.next());

        query1.add((Term[])termsWithPrefix.toArray(new Term[0]));
        query2.add((Term[])termsWithPrefix.toArray(new Term[0]));
        BooleanQuery qry = new BooleanQuery();
        qry.add(query1,true,false);
        qry.add(new TermQuery(new Term ("Object_Type", "contract")), true, false);
        Hits result;
        result = searcher.search(qry);
        assertEquals(2, result.length());

        result = searcher.search(query2);
        assertEquals(0, result.length());
    }
}


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