Lucene example source code file (TestSpansAdvanced2.java)

This example Lucene source code file (TestSpansAdvanced2.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

a, a, d, d, exception, io, ioexception, ioexception, override, query, should, spantermquery, string, string, term

The Lucene TestSpansAdvanced2.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 java.io.IOException;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.RandomIndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.IndexWriterConfig.OpenMode;
import org.apache.lucene.search.*;

/*******************************************************************************
 * Some expanded tests to make sure my patch doesn't break other SpanTermQuery
 * functionality.
 * 
 */
public class TestSpansAdvanced2 extends TestSpansAdvanced {
  IndexSearcher searcher2;
  IndexReader reader2;
  
  /**
   * Initializes the tests by adding documents to the index.
   */
  @Override
  public void setUp() throws Exception {
    super.setUp();
    
    // create test index
    final RandomIndexWriter writer = new RandomIndexWriter(random, mDirectory,
        newIndexWriterConfig(TEST_VERSION_CURRENT, new StandardAnalyzer(TEST_VERSION_CURRENT))
                                                           .setOpenMode(OpenMode.APPEND).setMergePolicy(newLogMergePolicy()));
    addDocument(writer, "A", "Should we, could we, would we?");
    addDocument(writer, "B", "It should.  Should it?");
    addDocument(writer, "C", "It shouldn't.");
    addDocument(writer, "D", "Should we, should we, should we.");
    reader2 = writer.getReader();
    writer.close();
    
    // re-open the searcher since we added more docs
    searcher2 = newSearcher(reader2);
  }
  
  @Override
  public void tearDown() throws Exception {
    searcher2.close();
    reader2.close();
    super.tearDown();
  }
  
  /**
   * Verifies that the index has the correct number of documents.
   * 
   * @throws Exception
   */
  public void testVerifyIndex() throws Exception {
    final IndexReader reader = IndexReader.open(mDirectory, true);
    assertEquals(8, reader.numDocs());
    reader.close();
  }
  
  /**
   * Tests a single span query that matches multiple documents.
   * 
   * @throws IOException
   */
  public void testSingleSpanQuery() throws IOException {
    
    final Query spanQuery = new SpanTermQuery(new Term(FIELD_TEXT, "should"));
    final String[] expectedIds = new String[] {"B", "D", "1", "2", "3", "4",
        "A"};
    final float[] expectedScores = new float[] {0.625f, 0.45927936f,
        0.35355338f, 0.35355338f, 0.35355338f, 0.35355338f, 0.26516503f,};
    assertHits(searcher2, spanQuery, "single span query", expectedIds,
        expectedScores);
  }
  
  /**
   * Tests a single span query that matches multiple documents.
   * 
   * @throws IOException
   */
  public void testMultipleDifferentSpanQueries() throws IOException {
    
    final Query spanQuery1 = new SpanTermQuery(new Term(FIELD_TEXT, "should"));
    final Query spanQuery2 = new SpanTermQuery(new Term(FIELD_TEXT, "we"));
    final BooleanQuery query = new BooleanQuery();
    query.add(spanQuery1, BooleanClause.Occur.MUST);
    query.add(spanQuery2, BooleanClause.Occur.MUST);
    final String[] expectedIds = new String[] {"D", "A"};
    // these values were pre LUCENE-413
    // final float[] expectedScores = new float[] { 0.93163157f, 0.20698164f };
    final float[] expectedScores = new float[] {1.0191123f, 0.93163157f};
    assertHits(searcher2, query, "multiple different span queries",
        expectedIds, expectedScores);
  }
  
  /**
   * Tests two span queries.
   * 
   * @throws IOException
   */
  @Override
  public void testBooleanQueryWithSpanQueries() throws IOException {
    
    doTestBooleanQueryWithSpanQueries(searcher2, 0.73500174f);
  }
}