org.apache.lucene.analysis.shingle

Class ShingleAnalyzerWrapper

java.lang.Object

org.apache.lucene.analysis.Analyzer

org.apache.lucene.analysis.shingle.ShingleAnalyzerWrapper

public class ShingleAnalyzerWrapper
extends Analyzer

A ShingleAnalyzerWrapper wraps a ShingleFilter around another analyzer. A shingle is another namefor a token based n-gram.

Field Summary

Fields

Modifier and Type	Field and Description
protected Analyzer	defaultAnalyzer
protected int	maxShingleSize
protected boolean	outputUnigrams

Constructor Summary

Constructors

Constructor and Description
ShingleAnalyzerWrapper() Wraps StandardAnalyzer.
ShingleAnalyzerWrapper(Analyzer defaultAnalyzer)
ShingleAnalyzerWrapper(Analyzer defaultAnalyzer, int maxShingleSize)
ShingleAnalyzerWrapper(int nGramSize)

Method Summary

Methods

Modifier and Type	Method and Description
int	getMaxShingleSize() The max shingle (ngram) size
boolean	isOutputUnigrams()
void	setMaxShingleSize(int maxShingleSize) Set the maximum size of output shingles
void	setOutputUnigrams(boolean outputUnigrams) Shall the filter pass the original tokens (the "unigrams") to the output stream?
TokenStream	tokenStream(java.lang.String fieldName, java.io.Reader reader) Creates a TokenStream which tokenizes all the text in the provided Reader.

Methods inherited from class org.apache.lucene.analysis.Analyzer

close, getPositionIncrementGap, getPreviousTokenStream, reusableTokenStream, setPreviousTokenStream

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

defaultAnalyzer

protected Analyzer defaultAnalyzer

maxShingleSize

protected int maxShingleSize

outputUnigrams

protected boolean outputUnigrams

Constructor Detail

ShingleAnalyzerWrapper

public ShingleAnalyzerWrapper(Analyzer defaultAnalyzer)

ShingleAnalyzerWrapper

public ShingleAnalyzerWrapper(Analyzer defaultAnalyzer,
                      int maxShingleSize)

ShingleAnalyzerWrapper

public ShingleAnalyzerWrapper()

Wraps StandardAnalyzer.

ShingleAnalyzerWrapper

public ShingleAnalyzerWrapper(int nGramSize)

Method Detail

getMaxShingleSize

public int getMaxShingleSize()

The max shingle (ngram) size

Returns:

The max shingle (ngram) size

setMaxShingleSize

public void setMaxShingleSize(int maxShingleSize)

Set the maximum size of output shingles

Parameters:

maxShingleSize - max shingle size

isOutputUnigrams

public boolean isOutputUnigrams()

setOutputUnigrams

public void setOutputUnigrams(boolean outputUnigrams)

Shall the filter pass the original tokens (the "unigrams") to the output stream?

Parameters:

outputUnigrams - Whether or not the filter shall pass the original tokens to the output stream

tokenStream

public TokenStream tokenStream(java.lang.String fieldName,
                      java.io.Reader reader)

Description copied from class: Analyzer

Creates a TokenStream which tokenizes all the text in the provided Reader. Must be able to handle null field name for backward compatibility.

Specified by:

tokenStream in class Analyzer