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Lucene example source code file (TestLaoBreakIterator.java)

This example Lucene source code file (TestLaoBreakIterator.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

breakiterator, breakiterator, chararrayiterator, chararrayiterator, exception, exception, inputstream, io, lucenetestcase, override, string, string, testlaobreakiterator

The Lucene TestLaoBreakIterator.java source code

package org.apache.lucene.analysis.icu.segmentation;

/**
 * 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.InputStream;

import org.apache.lucene.util.LuceneTestCase;

import com.ibm.icu.lang.UCharacter;
import com.ibm.icu.text.BreakIterator;
import com.ibm.icu.text.RuleBasedBreakIterator;
import com.ibm.icu.text.UTF16;

/**
 * Tests LaoBreakIterator and its RBBI rules
 */
public class TestLaoBreakIterator extends LuceneTestCase {
  private BreakIterator wordIterator;
  
  @Override
  public void setUp() throws Exception {
    super.setUp();
    InputStream is = getClass().getResourceAsStream("Lao.brk");
    wordIterator = new LaoBreakIterator(RuleBasedBreakIterator.getInstanceFromCompiledRules(is));
    is.close();
  }
  
  private void assertBreaksTo(BreakIterator iterator, String sourceText, String tokens[]) {
    char text[] = sourceText.toCharArray();
    CharArrayIterator ci = new CharArrayIterator();
    ci.setText(text, 0, text.length);
    iterator.setText(ci);
    
    for (int i = 0; i < tokens.length; i++) {
      int start, end;
      do {
        start = iterator.current();
        end = iterator.next();
      } while (end != BreakIterator.DONE && !isWord(text, start, end));
      assertTrue(start != BreakIterator.DONE);
      assertTrue(end != BreakIterator.DONE);
      assertEquals(tokens[i], new String(text, start, end - start));
    }
    
    assertTrue(iterator.next() == BreakIterator.DONE);
  }
  
  protected boolean isWord(char text[], int start, int end) {
    int codepoint;
    for (int i = start; i < end; i += UTF16.getCharCount(codepoint)) {
      codepoint = UTF16.charAt(text, 0, end, start);

      if (UCharacter.isLetterOrDigit(codepoint))
        return true;
      }

    return false;
  }
  
  public void testBasicUsage() throws Exception {
    assertBreaksTo(wordIterator, "ກວ່າດອກ", new String[] { "ກວ່າ", "ດອກ" });
    assertBreaksTo(wordIterator, "ຜູ້​ເຂົ້າ", new String[] { "ຜູ້", "ເຂົ້າ" });
    assertBreaksTo(wordIterator, "", new String[] {});
    assertBreaksTo(wordIterator, "ສະບາຍດີ", new String[] { "ສະ", "ບາຍ", "ດີ" });
  }
  
  public void testNumerics() throws Exception {
    assertBreaksTo(wordIterator, "໐໑໒໓", new String[] { "໐໑໒໓" });
    assertBreaksTo(wordIterator, "໐໑໒໓.໕໖", new String[] { "໐໑໒໓.໕໖" });
  }
 
  public void testTextAndNumerics() throws Exception {
    assertBreaksTo(wordIterator, "ກວ່າດອກ໐໑໒໓", new String[] { "ກວ່າ", "ດອກ", "໐໑໒໓" });
  }
}

Other Lucene examples (source code examples)

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