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Lucene example source code file (TestLocaleMethods.java)

This example Lucene source code file (TestLocaleMethods.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

booleanquery, exception, exception, io, matchalldocsquery, query, randomindexwriter, scoredoc, scoredoc, sort, sortfield, sortfield, string, string, text, topfielddocs, util

The Lucene TestLocaleMethods.java source code

package org.apache.lucene.search;

import java.io.IOException;
import java.text.Collator;
import java.util.Locale;

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.search.BooleanClause.Occur;
import org.apache.lucene.store.Directory;
import org.apache.lucene.util.LuceneTestCase;
import org.apache.lucene.util._TestUtil;
import org.junit.AfterClass;
import org.junit.BeforeClass;

/**
 * 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.
 */

/**
 * Tests Locale-based sort and range search
 */
public class TestLocaleMethods extends LuceneTestCase {
  private static Locale locale;
  private static Collator collator;
  private static IndexSearcher searcher;
  private static IndexReader reader;
  private static Directory dir;
  private static int numDocs;

  @BeforeClass
  public static void beforeClass() throws Exception {
    locale = LuceneTestCase.randomLocale(random);
    collator = Collator.getInstance(locale);
    numDocs = 1000 * RANDOM_MULTIPLIER;
    dir = newDirectory();
    RandomIndexWriter iw = new RandomIndexWriter(random, dir);
    for (int i = 0; i < numDocs; i++) {
      Document doc = new Document();
      String value = _TestUtil.randomUnicodeString(random);
      Field field = newField("field", value, Field.Store.YES, Field.Index.NOT_ANALYZED_NO_NORMS);
      doc.add(field);
      iw.addDocument(doc);
    }
    reader = iw.getReader();
    iw.close();

    searcher = newSearcher(reader);
  }
  
  @AfterClass
  public static void afterClass() throws Exception {
    searcher.close();
    reader.close();
    dir.close();
    locale = null;
    collator = null;
    searcher = null;
    reader = null;
    dir = null;
  }
  
  public void testSort() throws Exception {
    SortField sf = new SortField("field", locale);
    TopFieldDocs docs = searcher.search(new MatchAllDocsQuery(), null, numDocs, new Sort(sf));
    String prev = "";
    for (ScoreDoc doc : docs.scoreDocs) {
      String value = reader.document(doc.doc).get("field");
      assertTrue(collator.compare(value, prev) >= 0);
      prev = value;
    }
  }
  
  public void testSort2() throws Exception {
    SortField sf = new SortField("field", new FieldComparatorSource() {
      @Override
      public FieldComparator newComparator(String fieldname, int numHits, int sortPos, boolean reversed) throws IOException {
        return new FieldComparator.StringComparatorLocale(numHits, fieldname, locale);
      }
    });
    TopFieldDocs docs = searcher.search(new MatchAllDocsQuery(), null, numDocs, new Sort(sf));
    String prev = "";
    for (ScoreDoc doc : docs.scoreDocs) {
      String value = reader.document(doc.doc).get("field");
      assertTrue(collator.compare(value, prev) >= 0);
      prev = value;
    }
  }
  
  private void doTestRanges(String startPoint, String endPoint, Query query) throws Exception {
    // positive test
    TopDocs docs = searcher.search(query, numDocs);
    for (ScoreDoc doc : docs.scoreDocs) {
      String value = reader.document(doc.doc).get("field");
      assertTrue(collator.compare(value, startPoint) >= 0);
      assertTrue(collator.compare(value, endPoint) <= 0);
    }
    
    // negative test
    BooleanQuery bq = new BooleanQuery();
    bq.add(new MatchAllDocsQuery(), Occur.SHOULD);
    bq.add(query, Occur.MUST_NOT);
    docs = searcher.search(bq, numDocs);
    for (ScoreDoc doc : docs.scoreDocs) {
      String value = reader.document(doc.doc).get("field");
      assertTrue(collator.compare(value, startPoint) < 0 || collator.compare(value, endPoint) > 0);
    }
  }
  
  public void testRangeQuery() throws Exception {
    int numQueries = 100*RANDOM_MULTIPLIER;
    for (int i = 0; i < numQueries; i++) {
      String startPoint = _TestUtil.randomUnicodeString(random);
      String endPoint = _TestUtil.randomUnicodeString(random);
      Query query = new TermRangeQuery("field", startPoint, endPoint, true, true, collator);
      doTestRanges(startPoint, endPoint, query);
    }
  }
  
  public void testRangeFilter() throws Exception {
    int numQueries = 100*RANDOM_MULTIPLIER;
    for (int i = 0; i < numQueries; i++) {
      String startPoint = _TestUtil.randomUnicodeString(random);
      String endPoint = _TestUtil.randomUnicodeString(random);
      Query query = new ConstantScoreQuery(new TermRangeFilter("field", startPoint, endPoint, true, true, collator));
      doTestRanges(startPoint, endPoint, query);
    }
  }
}

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