Examples of org.apache.lucene.analysis.en.PorterStemFilter

org.apache.lucene.analysis.en.PorterStemFilter
Transforms the token stream as per the Porter stemming algorithm. Note: the input to the stemming filter must already be in lower case, so you will need to use LowerCaseFilter or LowerCaseTokenizer farther down the Tokenizer chain in order for this to work properly!
To use this filter with other analyzers, you'll want to write an Analyzer class that sets up the TokenStream chain as you want it. To use this with LowerCaseTokenizer, for example, you'd write an analyzer like this:
```
 class MyAnalyzer extends Analyzer { {@literal @Override}protected TokenStreamComponents createComponents(String fieldName, Reader reader) { Tokenizer source = new LowerCaseTokenizer(version, reader); return new TokenStreamComponents(source, new PorterStemFilter(source)); } } 
```
Note: This filter is aware of the {@link KeywordAttribute}. To prevent certain terms from being passed to the stemmer {@link KeywordAttribute#isKeyword()} should be set to truein a previous {@link TokenStream}.

    }
  }
  
  @Override
  public PorterStemFilter create(TokenStream input) {
    return new PorterStemFilter(input);
  }

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      result = new WordTokenFilter(tokenizer);
    }
    // result = new LowerCaseFilter(result);
    // LowerCaseFilter is not needed, as SegTokenFilter lowercases Basic Latin text.
    // The porter stemming is too strict, this is not a bug, this is a feature:)
    result = new PorterStemFilter(result);
    if (!stopWords.isEmpty()) {
      result = new StopFilter(matchVersion, result, stopWords);
    }
    return new TokenStreamComponents(tokenizer, result);
  }

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    // the override filter will convert "booked" to "books",
    // but also mark it with KeywordAttribute so Porter will not change it.
    StemmerOverrideFilter.Builder builder = new StemmerOverrideFilter.Builder();
    builder.add("booked", "books");
    Tokenizer tokenizer = new KeywordTokenizer(new StringReader("booked"));
    TokenStream stream = new PorterStemFilter(new StemmerOverrideFilter(
        tokenizer, builder.build()));
    assertTokenStreamContents(stream, new String[] {"books"});
  }

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    // the override filter will convert "booked" to "books",
    // but also mark it with KeywordAttribute so Porter will not change it.
    StemmerOverrideFilter.Builder builder = new StemmerOverrideFilter.Builder(true);
    builder.add("boOkEd", "books");
    Tokenizer tokenizer = new KeywordTokenizer(new StringReader("BooKeD"));
    TokenStream stream = new PorterStemFilter(new StemmerOverrideFilter(
        tokenizer, builder.build()));
    assertTokenStreamContents(stream, new String[] {"books"});
  }

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  }


  public void testNoOverrides() throws IOException {
    StemmerOverrideFilter.Builder builder = new StemmerOverrideFilter.Builder(true);
    Tokenizer tokenizer = new KeywordTokenizer(new StringReader("book"));
    TokenStream stream = new PorterStemFilter(new StemmerOverrideFilter(
        tokenizer, builder.build()));
    assertTokenStreamContents(stream, new String[] {"book"});
  }

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        output.add(entry.getValue());
      }
    }
    Tokenizer tokenizer = new WhitespaceTokenizer(TEST_VERSION_CURRENT,
        new StringReader(input.toString()));
    TokenStream stream = new PorterStemFilter(new StemmerOverrideFilter(
        tokenizer, builder.build()));
    assertTokenStreamContents(stream, output.toArray(new String[0]));
  }

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    StemmerOverrideMap build = builder.build();
    for (Entry<String,String> entry : entrySet) {
      if (random().nextBoolean()) {
        Tokenizer tokenizer = new KeywordTokenizer(new StringReader(
            entry.getKey()));
        TokenStream stream = new PorterStemFilter(new StemmerOverrideFilter(
            tokenizer, build));
        assertTokenStreamContents(stream, new String[] {entry.getValue()});
      }
    }
  }

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    TokenStream result = new StandardFilter(LUCENE_VERSION, tokenizer);
    result = new LowerCaseFilter(LUCENE_VERSION, result);
    result = new ASCIIFoldingFilter(result);
    result = new AlphaNumericMaxLengthFilter(result);
    result = new StopFilter(LUCENE_VERSION, result, STOP_SET);
    result = new PorterStemFilter(result);
    return new TokenStreamComponents(tokenizer, result);
  }

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        final Tokenizer source = new DSTokenizer(matchVersion, reader);
        TokenStream result = new StandardFilter(matchVersion, source);
        
        result = new LowerCaseFilter(matchVersion, result);
        result = new StopFilter(matchVersion, result, stopSet);
        result = new PorterStemFilter(result);


        return new TokenStreamComponents(source, result);
    }

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    private static final class PorterStemAnalyzer extends Analyzer {
        @Override
        protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
            Tokenizer source = new LowerCaseTokenizer(Constants.VERSION, reader);
            return new TokenStreamComponents(source, new PorterStemFilter(source));
        }

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