org.apache.lucene.analysis

Class PorterStemFilter

public final class PorterStemFilter extends TokenFilter

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 {
      public final TokenStream tokenStream(String fieldName, Reader reader) {
        return new PorterStemFilter(new LowerCaseTokenizer(reader));
      }
    }
    
Constructor Summary
PorterStemFilter(TokenStream in)
Method Summary
Tokennext()
Returns the next input Token, after being stemmed

Constructor Detail

PorterStemFilter

public PorterStemFilter(TokenStream in)

Method Detail

next

public final Token next()
Returns the next input Token, after being stemmed
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