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Lucene example source code file (TestWordlistLoader.java)

This example Lucene source code file (TestWordlistLoader.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

bufferedreader, hashset, hashset, io, ioexception, lucenetestcase, one, one\n, one\n, set, string, string, stringreader, stringreader, testwordlistloader, util

The Lucene TestWordlistLoader.java source code

package org.apache.lucene.index;

/**
 * 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.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.HashSet;
import java.util.Set;

import org.apache.lucene.util.LuceneTestCase;

import org.apache.lucene.analysis.WordlistLoader;

public class TestWordlistLoader extends LuceneTestCase {

  public void testWordlistLoading() throws IOException {
    String s = "ONE\n  two \nthree";
    HashSet<String> wordSet1 = WordlistLoader.getWordSet(new StringReader(s));
    checkSet(wordSet1);
    HashSet<String> wordSet2 = WordlistLoader.getWordSet(new BufferedReader(new StringReader(s)));
    checkSet(wordSet2);
  }

  public void testComments() throws Exception {
    String s = "ONE\n  two \nthree\n#comment";
    HashSet<String> wordSet1 = WordlistLoader.getWordSet(new StringReader(s), "#");
    checkSet(wordSet1);
    assertFalse(wordSet1.contains("#comment"));
    assertFalse(wordSet1.contains("comment"));
  }


  private void checkSet(HashSet<String> wordset) {
    assertEquals(3, wordset.size());
    assertTrue(wordset.contains("ONE"));		// case is not modified
    assertTrue(wordset.contains("two"));		// surrounding whitespace is removed
    assertTrue(wordset.contains("three"));
    assertFalse(wordset.contains("four"));
  }

  /**
   * Test stopwords in snowball format
   */
  public void testSnowballListLoading() throws IOException {
    String s = 
      "|comment\n" + // commented line
      " |comment\n" + // commented line with leading whitespace
      "\n" + // blank line
      "  \t\n" + // line with only whitespace
      " |comment | comment\n" + // commented line with comment
      "ONE\n" + // stopword, in uppercase
      "   two   \n" + // stopword with leading/trailing space
      " three   four five \n" + // multiple stopwords
      "six seven | comment\n"; //multiple stopwords + comment
    Set<String> wordset = WordlistLoader.getSnowballWordSet(new StringReader(s));
    assertEquals(7, wordset.size());
    assertTrue(wordset.contains("ONE"));
    assertTrue(wordset.contains("two"));
    assertTrue(wordset.contains("three"));
    assertTrue(wordset.contains("four"));
    assertTrue(wordset.contains("five"));
    assertTrue(wordset.contains("six"));
    assertTrue(wordset.contains("seven"));
  }
}

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