Lucene example source code file (TestDistance.java)

This example Lucene source code file (TestDistance.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

club, club, dance, document, exception, indexreader, io, ioexception, laylah, potomac, potomac, restaurant, restaurant, string, string

The Lucene TestDistance.java source code

/**
 * 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.
 */
package org.apache.lucene.spatial.tier;

import java.io.IOException;

import org.apache.lucene.analysis.MockAnalyzer;
import org.apache.lucene.analysis.WhitespaceAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.QueryWrapperFilter;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util.NumericUtils;
import org.apache.lucene.store.Directory;

public class TestDistance extends LuceneTestCase {
  
  private Directory directory;
  // reston va
  private double lat = 38.969398; 
  private double lng= -77.386398;
  private String latField = "lat";
  private String lngField = "lng";
  private IndexWriter writer;
  
  @Override
  public void setUp() throws Exception {
    super.setUp();
    directory = newDirectory();
    writer = new IndexWriter(directory, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
    addData(writer);
    
  }

  @Override
  public void tearDown() throws Exception {
    writer.close();
    directory.close();
    super.tearDown();
  }
  
  private void addPoint(IndexWriter writer, String name, double lat, double lng) throws IOException{
    
    Document doc = new Document();
    
    doc.add(newField("name", name,Field.Store.YES, Field.Index.ANALYZED));
    
    // convert the lat / long to lucene fields
    doc.add(new Field(latField, NumericUtils.doubleToPrefixCoded(lat),Field.Store.YES, Field.Index.NOT_ANALYZED));
    doc.add(new Field(lngField, NumericUtils.doubleToPrefixCoded(lng),Field.Store.YES, Field.Index.NOT_ANALYZED));
    
    // add a default meta field to make searching all documents easy 
    doc.add(newField("metafile", "doc",Field.Store.YES, Field.Index.ANALYZED));
    writer.addDocument(doc);
    
  }
  

  private void addData(IndexWriter writer) throws IOException {
    addPoint(writer,"McCormick & Schmick's Seafood Restaurant",38.9579000,-77.3572000);
    addPoint(writer,"Jimmy's Old Town Tavern",38.9690000,-77.3862000);
    addPoint(writer,"Ned Devine's",38.9510000,-77.4107000);
    addPoint(writer,"Old Brogue Irish Pub",38.9955000,-77.2884000);
    addPoint(writer,"Alf Laylah Wa Laylah",38.8956000,-77.4258000);
    addPoint(writer,"Sully's Restaurant & Supper",38.9003000,-77.4467000);
    addPoint(writer,"TGIFriday",38.8725000,-77.3829000);
    addPoint(writer,"Potomac Swing Dance Club",38.9027000,-77.2639000);
    addPoint(writer,"White Tiger Restaurant",38.9027000,-77.2638000);
    addPoint(writer,"Jammin' Java",38.9039000,-77.2622000);
    addPoint(writer,"Potomac Swing Dance Club",38.9027000,-77.2639000);
    addPoint(writer,"WiseAcres Comedy Club",38.9248000,-77.2344000);
    addPoint(writer,"Glen Echo Spanish Ballroom",38.9691000,-77.1400000);
    addPoint(writer,"Whitlow's on Wilson",38.8889000,-77.0926000);
    addPoint(writer,"Iota Club and Cafe",38.8890000,-77.0923000);
    addPoint(writer,"Hilton Washington Embassy Row",38.9103000,-77.0451000);
    addPoint(writer,"HorseFeathers, Bar & Grill", 39.01220000000001, -77.3942);
    writer.commit();
  }

  public void testLatLongFilterOnDeletedDocs() throws Exception {
    writer.deleteDocuments(new Term("name", "Potomac"));
    IndexReader r = IndexReader.open(writer, true);
    LatLongDistanceFilter f = new LatLongDistanceFilter(new QueryWrapperFilter(new MatchAllDocsQuery()),
                                                        lat, lng, 1.0, latField, lngField);

    IndexReader[] readers = r.getSequentialSubReaders();
    for(int i=0;i<readers.length;i++) {
      f.getDocIdSet(readers[i]);
    }
    r.close();
  }
 
  /* these tests do not test anything, as no assertions:
  public void testMiles() {
    double LLM = DistanceUtils.getInstance().getLLMDistance(lat, lng,39.012200001, -77.3942);
    System.out.println(LLM);
    System.out.println("-->"+DistanceUtils.getInstance().getDistanceMi(lat, lng, 39.0122, -77.3942));
  }
  
  public void testMiles2(){
    System.out.println("Test Miles 2");
    double LLM = DistanceUtils.getInstance().getLLMDistance(44.30073, -78.32131,43.687267, -79.39842);
    System.out.println(LLM);
    System.out.println("-->"+DistanceUtils.getInstance().getDistanceMi(44.30073, -78.32131, 43.687267, -79.39842));
    
  }
  */
  
//  public void testDistanceQueryCacheable() throws IOException {
//
//    // create two of the same distance queries
//    double miles = 6.0;
//    DistanceQuery dq1 = new DistanceQuery(lat, lng, miles, latField, lngField, true);
//    DistanceQuery dq2 = new DistanceQuery(lat, lng, miles, latField, lngField, true);
//
//    /* ensure that they hash to the same code, which will cause a cache hit in solr */
//    System.out.println("hash differences?");
//    assertEquals(dq1.getQuery().hashCode(), dq2.getQuery().hashCode());
//    
//    /* ensure that changing the radius makes a different hash code, creating a cache miss in solr */
//    DistanceQuery widerQuery = new DistanceQuery(lat, lng, miles + 5.0, latField, lngField, false);
//    assertTrue(dq1.getQuery().hashCode() != widerQuery.getQuery().hashCode());
//  }
}