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Java Source Code / Java Documentation » Net » lucene connector » org.apache.lucene.analysis 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.lucene.analysis.Analyzer

All known Subclasses:   org.apache.lucene.analysis.standard.StandardAnalyzer,  org.apache.lucene.analysis.SimpleAnalyzer,  org.apache.lucene.analysis.KeywordAnalyzer,  org.apache.lucene.analysis.br.BrazilianAnalyzer,  org.apache.lucene.analysis.cn.ChineseAnalyzer,  org.apache.lucene.analysis.PerFieldAnalyzerWrapper,  org.apache.lucene.analysis.de.GermanAnalyzer,  org.apache.lucene.analysis.cz.CzechAnalyzer,  org.apache.lucene.analysis.snowball.SnowballAnalyzer,  org.apache.lucene.analysis.cjk.CJKAnalyzer,  org.apache.lucene.analysis.WhitespaceAnalyzer,  org.apache.lucene.analysis.th.ThaiAnalyzer,  org.apache.lucene.analysis.StopAnalyzer,  org.apache.lucene.analysis.nl.DutchAnalyzer,  org.apache.lucene.index.memory.PatternAnalyzer,  org.apache.lucene.analysis.ru.RussianAnalyzer,  org.apache.lucene.analysis.fr.FrenchAnalyzer,  org.apache.lucene.analysis.el.GreekAnalyzer,
Analyzer
abstract public class Analyzer (Code)
An Analyzer builds TokenStreams, which analyze text. It thus represents a policy for extracting index terms from text.

Typical implementations first build a Tokenizer, which breaks the stream of characters from the Reader into raw Tokens. One or more TokenFilters may then be applied to the output of the Tokenizer.

WARNING: You must override one of the methods defined by this class in your subclass or the Analyzer will enter an infinite loop.





Method Summary
public  intgetPositionIncrementGap(String fieldName)
     Invoked before indexing a Fieldable instance if terms have already been added to that field.
protected  ObjectgetPreviousTokenStream()
     Used by Analyzers that implement reusableTokenStream to retrieve previously saved TokenStreams for re-use by the same thread.
public  TokenStreamreusableTokenStream(String fieldName, Reader reader)
     Creates a TokenStream that is allowed to be re-used from the previous time that the same thread called this method.
protected  voidsetPreviousTokenStream(Object obj)
     Used by Analyzers that implement reusableTokenStream to save a TokenStream for later re-use by the same thread.
abstract public  TokenStreamtokenStream(String fieldName, Reader reader)
     Creates a TokenStream which tokenizes all the text in the provided Reader.



Method Detail
getPositionIncrementGap
public int getPositionIncrementGap(String fieldName)(Code)
Invoked before indexing a Fieldable instance if terms have already been added to that field. This allows custom analyzers to place an automatic position increment gap between Fieldable instances using the same field name. The default value position increment gap is 0. With a 0 position increment gap and the typical default token position increment of 1, all terms in a field, including across Fieldable instances, are in successive positions, allowing exact PhraseQuery matches, for instance, across Fieldable instance boundaries.
Parameters:
  fieldName - Fieldable name being indexed. position increment gap, added to the next token emitted from Analyzer.tokenStream(String,Reader)



getPreviousTokenStream
protected Object getPreviousTokenStream()(Code)
Used by Analyzers that implement reusableTokenStream to retrieve previously saved TokenStreams for re-use by the same thread.



reusableTokenStream
public TokenStream reusableTokenStream(String fieldName, Reader reader) throws IOException(Code)
Creates a TokenStream that is allowed to be re-used from the previous time that the same thread called this method. Callers that do not need to use more than one TokenStream at the same time from this analyzer should use this method for better performance.



setPreviousTokenStream
protected void setPreviousTokenStream(Object obj)(Code)
Used by Analyzers that implement reusableTokenStream to save a TokenStream for later re-use by the same thread.



tokenStream
abstract public TokenStream tokenStream(String fieldName, Reader reader)(Code)
Creates a TokenStream which tokenizes all the text in the provided Reader. Default implementation forwards to tokenStream(Reader) for compatibility with older version. Override to allow Analyzer to choose strategy based on document and/or field. Must be able to handle null field name for backward compatibility.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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