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Lucene example source code file (TestPhrasePrefixQuery.java)

This example Lucene source code file (TestPhrasePrefixQuery.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Lucene tags/keywords

document, document, indexreader, io, ioexception, linkedlist, multiphrasequery, multiphrasequery, randomindexwriter, randomindexwriter, string, term, term, termenum, testphraseprefixquery, util

The Lucene TestPhrasePrefixQuery.java source code

package org.apache.lucene.search;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.util.LuceneTestCase;

import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.TermEnum;
import org.apache.lucene.store.Directory;

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

/**
 * This class tests PhrasePrefixQuery class.
 */
public class TestPhrasePrefixQuery extends LuceneTestCase {
  
  /**
     *
     */
  public void testPhrasePrefix() throws IOException {
    Directory indexStore = newDirectory();
    RandomIndexWriter writer = new RandomIndexWriter(random, indexStore);
    Document doc1 = new Document();
    Document doc2 = new Document();
    Document doc3 = new Document();
    Document doc4 = new Document();
    Document doc5 = new Document();
    doc1.add(newField("body", "blueberry pie", Field.Store.YES,
        Field.Index.ANALYZED));
    doc2.add(newField("body", "blueberry strudel", Field.Store.YES,
        Field.Index.ANALYZED));
    doc3.add(newField("body", "blueberry pizza", Field.Store.YES,
        Field.Index.ANALYZED));
    doc4.add(newField("body", "blueberry chewing gum", Field.Store.YES,
        Field.Index.ANALYZED));
    doc5.add(newField("body", "piccadilly circus", Field.Store.YES,
        Field.Index.ANALYZED));
    writer.addDocument(doc1);
    writer.addDocument(doc2);
    writer.addDocument(doc3);
    writer.addDocument(doc4);
    writer.addDocument(doc5);
    IndexReader reader = writer.getReader();
    writer.close();
    
    IndexSearcher searcher = newSearcher(reader);
    
    // PhrasePrefixQuery query1 = new PhrasePrefixQuery();
    MultiPhraseQuery query1 = new MultiPhraseQuery();
    // PhrasePrefixQuery query2 = new PhrasePrefixQuery();
    MultiPhraseQuery query2 = new MultiPhraseQuery();
    query1.add(new Term("body", "blueberry"));
    query2.add(new Term("body", "strawberry"));
    
    LinkedList<Term> termsWithPrefix = new LinkedList();
    
    // this TermEnum gives "piccadilly", "pie" and "pizza".
    String prefix = "pi";
    TermEnum te = reader.terms(new Term("body", prefix + "*"));
    do {
        if (te.term().text().startsWith(prefix))
        {
            termsWithPrefix.add(te.term());
        }
    } while (te.next());
    
    query1.add(termsWithPrefix.toArray(new Term[0]));
    query2.add(termsWithPrefix.toArray(new Term[0]));
    
    ScoreDoc[] result;
    result = searcher.search(query1, null, 1000).scoreDocs;
    assertEquals(2, result.length);
    
    result = searcher.search(query2, null, 1000).scoreDocs;
    assertEquals(0, result.length);
    searcher.close();
    reader.close();
    indexStore.close();
  }
}

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