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Lucene example source code file (TestMappingCharFilter.java)

This example Lucene source code file (TestMappingCharFilter.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

basetokenstreamtestcase, charstream, charstream, exception, exception, io, mappingcharfilter, mappingcharfilter, mocktokenizer, normalizecharmap, string, stringreader, stringreader, testmappingcharfilter, tokenstream

The Lucene TestMappingCharFilter.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.analysis;

import java.io.StringReader;

public class TestMappingCharFilter extends BaseTokenStreamTestCase {

  NormalizeCharMap normMap;

  @Override
  public void setUp() throws Exception {
    super.setUp();
    normMap = new NormalizeCharMap();

    normMap.add( "aa", "a" );
    normMap.add( "bbb", "b" );
    normMap.add( "cccc", "cc" );

    normMap.add( "h", "i" );
    normMap.add( "j", "jj" );
    normMap.add( "k", "kkk" );
    normMap.add( "ll", "llll" );

    normMap.add( "empty", "" );
  }

  public void testReaderReset() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "x" ) );
    char[] buf = new char[10];
    int len = cs.read(buf, 0, 10);
    assertEquals( 1, len );
    assertEquals( 'x', buf[0]) ;
    len = cs.read(buf, 0, 10);
    assertEquals( -1, len );

    // rewind
    cs.reset();
    len = cs.read(buf, 0, 10);
    assertEquals( 1, len );
    assertEquals( 'x', buf[0]) ;
  }

  public void testNothingChange() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "x" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[]{"x"}, new int[]{0}, new int[]{1});
  }

  public void test1to1() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "h" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[]{"i"}, new int[]{0}, new int[]{1});
  }

  public void test1to2() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "j" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[]{"jj"}, new int[]{0}, new int[]{1});
  }

  public void test1to3() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "k" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[]{"kkk"}, new int[]{0}, new int[]{1});
  }

  public void test2to4() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "ll" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[]{"llll"}, new int[]{0}, new int[]{2});
  }

  public void test2to1() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "aa" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[]{"a"}, new int[]{0}, new int[]{2});
  }

  public void test3to1() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "bbb" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[]{"b"}, new int[]{0}, new int[]{3});
  }

  public void test4to2() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "cccc" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[]{"cc"}, new int[]{0}, new int[]{4});
  }

  public void test5to0() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, new StringReader( "empty" ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts, new String[0]);
  }

  //
  //                1111111111222
  //      01234567890123456789012
  //(in)  h i j k ll cccc bbb aa
  //
  //                1111111111222
  //      01234567890123456789012
  //(out) i i jj kkk llll cc b a
  //
  //    h, 0, 1 =>    i, 0, 1
  //    i, 2, 3 =>    i, 2, 3
  //    j, 4, 5 =>   jj, 4, 5
  //    k, 6, 7 =>  kkk, 6, 7
  //   ll, 8,10 => llll, 8,10
  // cccc,11,15 =>   cc,11,15
  //  bbb,16,19 =>    b,16,19
  //   aa,20,22 =>    a,20,22
  //
  public void testTokenStream() throws Exception {
    CharStream cs = new MappingCharFilter( normMap, CharReader.get( new StringReader( "h i j k ll cccc bbb aa" ) ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts,
      new String[]{"i","i","jj","kkk","llll","cc","b","a"},
      new int[]{0,2,4,6,8,11,16,20},
      new int[]{1,3,5,7,10,15,19,22}
    );
  }

  //
  //
  //        0123456789
  //(in)    aaaa ll h
  //(out-1) aa llll i
  //(out-2) a llllllll i
  //
  // aaaa,0,4 => a,0,4
  //   ll,5,7 => llllllll,5,7
  //    h,8,9 => i,8,9
  public void testChained() throws Exception {
    CharStream cs = new MappingCharFilter( normMap,
        new MappingCharFilter( normMap, CharReader.get( new StringReader( "aaaa ll h" ) ) ) );
    TokenStream ts = new MockTokenizer(cs, MockTokenizer.WHITESPACE, false);
    assertTokenStreamContents(ts,
      new String[]{"a","llllllll","i"},
      new int[]{0,5,8},
      new int[]{4,7,9}
    );
  }
}

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