Lucene example source code file (TestSpanMultiTermQueryWrapper.java)

This example Lucene source code file (TestSpanMultiTermQueryWrapper.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, exception, exception, fuzzyquery, override, spanfirstquery, spanfirstquery, spanmultitermquerywrapper, spanpositionrangequery, spanpositionrangequery, spanquery, spanquery, term, wildcardquery

The Lucene TestSpanMultiTermQueryWrapper.java source code

package org.apache.lucene.search.spans;

/**
 * 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.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.FuzzyQuery;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.WildcardQuery;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;

/**
 * Tests for {@link SpanMultiTermQueryWrapper}, wrapping a few MultiTermQueries.
 */
public class TestSpanMultiTermQueryWrapper extends LuceneTestCase {
  private Directory directory;
  private IndexReader reader;
  private Searcher searcher;
  
  @Override
  public void setUp() throws Exception {
    super.setUp();
    directory = newDirectory();
    RandomIndexWriter iw = new RandomIndexWriter(random, directory);
    Document doc = new Document();
    Field field = newField("field", "", Field.Store.NO, Field.Index.ANALYZED);
    doc.add(field);
    
    field.setValue("quick brown fox");
    iw.addDocument(doc);
    field.setValue("jumps over lazy broun dog");
    iw.addDocument(doc);
    field.setValue("jumps over extremely very lazy broxn dog");
    iw.addDocument(doc);
    reader = iw.getReader();
    iw.close();
    searcher = newSearcher(reader);
  }
  
  @Override
  public void tearDown() throws Exception {
    searcher.close();
    reader.close();
    directory.close();
    super.tearDown();
  }
  
  public void testWildcard() throws Exception {
    WildcardQuery wq = new WildcardQuery(new Term("field", "bro?n"));
    SpanQuery swq = new SpanMultiTermQueryWrapper<WildcardQuery>(wq);
    // will only match quick brown fox
    SpanFirstQuery sfq = new SpanFirstQuery(swq, 2);
    assertEquals(1, searcher.search(sfq, 10).totalHits);
  }
  
  public void testPrefix() throws Exception {
    WildcardQuery wq = new WildcardQuery(new Term("field", "extrem*"));
    SpanQuery swq = new SpanMultiTermQueryWrapper<WildcardQuery>(wq);
    // will only match "jumps over extremely very lazy broxn dog"
    SpanFirstQuery sfq = new SpanFirstQuery(swq, 3);
    assertEquals(1, searcher.search(sfq, 10).totalHits);
  }
  
  public void testFuzzy() throws Exception {
    FuzzyQuery fq = new FuzzyQuery(new Term("field", "broan"));
    SpanQuery sfq = new SpanMultiTermQueryWrapper<FuzzyQuery>(fq);
    // will not match quick brown fox
    SpanPositionRangeQuery sprq = new SpanPositionRangeQuery(sfq, 3, 6);
    assertEquals(2, searcher.search(sprq, 10).totalHits);
  }
  
  public void testFuzzy2() throws Exception {
    // maximum of 1 term expansion
    FuzzyQuery fq = new FuzzyQuery(new Term("field", "broan"), 0.5f, 0, 1);
    SpanQuery sfq = new SpanMultiTermQueryWrapper<FuzzyQuery>(fq);
    // will only match jumps over lazy broun dog
    SpanPositionRangeQuery sprq = new SpanPositionRangeQuery(sfq, 0, 100);
    assertEquals(1, searcher.search(sprq, 10).totalHits);
  }
}