org.apache.lucene.analysis
Class PorterStemFilter
java.lang.Object
org.apache.lucene.analysis.TokenStream
org.apache.lucene.analysis.TokenFilter
org.apache.lucene.analysis.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));
}
}
Method Summary |
Token |
next()
Returns the next input Token, after being stemmed |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
PorterStemFilter
public PorterStemFilter(TokenStream in)
next
public final Token next()
throws java.io.IOException
- Returns the next input Token, after being stemmed
- Specified by:
next
in class TokenStream
- Throws:
java.io.IOException
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