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Lucene example source code file (TestKeywordMarkerFilter.java)

This example Lucene source code file (TestKeywordMarkerFilter.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

birds, houses, io, jumps, keywordmarkerfilter, keywordmarkerfilter, lowercasefiltermock, lowercasefiltermock, lucenefox, lucenefox, mocktokenizer, string, string, stringreader, the, util

The Lucene TestKeywordMarkerFilter.java source code

package org.apache.lucene.analysis;

import java.io.IOException;
import java.io.StringReader;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;

import org.apache.lucene.analysis.tokenattributes.KeywordAttribute;
import org.apache.lucene.analysis.tokenattributes.CharTermAttribute;
import org.junit.Test;

/**
 * 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.
 */

/**
 * Testcase for {@link KeywordMarkerFilter}
 */
public class TestKeywordMarkerFilter extends BaseTokenStreamTestCase {

  @Test
  public void testIncrementToken() throws IOException {
    CharArraySet set = new CharArraySet(TEST_VERSION_CURRENT, 5, true);
    set.add("lucenefox");
    String[] output = new String[] { "the", "quick", "brown", "LuceneFox",
        "jumps" };
    assertTokenStreamContents(new LowerCaseFilterMock(
        new KeywordMarkerFilter(new MockTokenizer(new StringReader(
            "The quIck browN LuceneFox Jumps"), MockTokenizer.WHITESPACE, false), set)), output);
    Set<String> jdkSet = new HashSet();
    jdkSet.add("LuceneFox");
    assertTokenStreamContents(new LowerCaseFilterMock(
        new KeywordMarkerFilter(new MockTokenizer(new StringReader(
            "The quIck browN LuceneFox Jumps"), MockTokenizer.WHITESPACE, false), jdkSet)), output);
    Set<?> set2 = set;
    assertTokenStreamContents(new LowerCaseFilterMock(
        new KeywordMarkerFilter(new MockTokenizer(new StringReader(
            "The quIck browN LuceneFox Jumps"), MockTokenizer.WHITESPACE, false), set2)), output);
  }

  // LUCENE-2901
  public void testComposition() throws Exception {   
    TokenStream ts = new LowerCaseFilterMock(
                     new KeywordMarkerFilter(
                     new KeywordMarkerFilter(
                     new MockTokenizer(new StringReader("Dogs Trees Birds Houses"), MockTokenizer.WHITESPACE, false),
                     new HashSet<String>(Arrays.asList(new String[] { "Birds", "Houses" }))), 
                     new HashSet<String>(Arrays.asList(new String[] { "Dogs", "Trees" }))));
    
    assertTokenStreamContents(ts, new String[] { "Dogs", "Trees", "Birds", "Houses" });
  }
  
  public static final class LowerCaseFilterMock extends TokenFilter {

    private final CharTermAttribute termAtt = addAttribute(CharTermAttribute.class);
    private final KeywordAttribute keywordAttr = addAttribute(KeywordAttribute.class);

    public LowerCaseFilterMock(TokenStream in) {
      super(in);
    }

    @Override
    public boolean incrementToken() throws IOException {
      if (input.incrementToken()) {
        if (!keywordAttr.isKeyword()) {
          final String term = termAtt.toString().toLowerCase(Locale.ENGLISH);
          termAtt.setEmpty().append(term);
        }
        return true;
      }
      return false;
    }

  }
}

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