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Java Source Code / Java Documentation » Net » lucene connector » org.apache.lucene.index.memory

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

org.apache.lucene.analysis .Analyzer

org.apache.lucene.index.memory .PatternAnalyzer

PatternAnalyzer

public class PatternAnalyzer extends Analyzer (Code)

Efficient Lucene analyzer/tokenizer that preferably operates on a String rather than a java.io.Reader , that can flexibly separate text into terms via a regular expression Pattern (with behaviour identical to String.split(String) ), and that combines the functionality of org.apache.lucene.analysis.LetterTokenizer , org.apache.lucene.analysis.LowerCaseTokenizer , org.apache.lucene.analysis.WhitespaceTokenizer , org.apache.lucene.analysis.StopFilter into a single efficient multi-purpose class.

If you are unsure how exactly a regular expression should look like, consider prototyping by simply trying various expressions on some test texts via String.split(String) . Once you are satisfied, give that regex to PatternAnalyzer. Also see Java Regular Expression Tutorial.

This class can be considerably faster than the "normal" Lucene tokenizers. It can also serve as a building block in a compound Lucene org.apache.lucene.analysis.TokenFilter chain. For example as in this stemming example:

 PatternAnalyzer pat = ...
 TokenStream tokenStream = new SnowballFilter(
 pat.tokenStream("content", "James is running round in the woods"), 
 "English"));

author:
whoschek.AT.lbl.DOT.gov

Inner Class :final static class FastStringReader extends StringReader

Field Summary
final public static PatternAnalyzer	DEFAULT_ANALYZER A lower-casing word analyzer with English stop words (can be shared freely across threads without harm); global per class loader.
final public static PatternAnalyzer	EXTENDED_ANALYZER A lower-casing word analyzer with extended English stop words (can be shared freely across threads without harm); global per class loader.
final public static Pattern	NON_WORD_PATTERN
final public static Pattern	WHITESPACE_PATTERN

Constructor Summary

public PatternAnalyzer(Pattern pattern, boolean toLowerCase, Set stopWords)
Constructs a new instance with the given parameters.
Parameters:
pattern - a regular expression delimiting tokens
Parameters:
toLowerCase - if true returns tokens after applyingString.toLowerCase()
Parameters:
stopWords - if non-null, ignores all tokens that are contained in thegiven stop set (after previously having applied toLowerCase()if applicable).

Method Summary
public boolean	equals(Object other) Indicates whether some other object is "equal to" this one. Parameters: other - the reference object with which to compare.
public int	hashCode() Returns a hash code value for the object.
public TokenStream	tokenStream(String fieldName, String text) Creates a token stream that tokenizes the given string into token terms (aka words).
public TokenStream	tokenStream(String fieldName, Reader reader) Creates a token stream that tokenizes all the text in the given Reader; This implementation forwards to `tokenStream(String, String)` and is less efficient than `tokenStream(String, String)`.

Field Detail

DEFAULT_ANALYZER
final public static PatternAnalyzer DEFAULT_ANALYZER(Code)
	A lower-casing word analyzer with English stop words (can be shared freely across threads without harm); global per class loader.

EXTENDED_ANALYZER
final public static PatternAnalyzer EXTENDED_ANALYZER(Code)
	A lower-casing word analyzer with extended English stop words (can be shared freely across threads without harm); global per class loader. The stop words are borrowed from http://thomas.loc.gov/home/stopwords.html, see http://thomas.loc.gov/home/all.about.inquery.html

NON_WORD_PATTERN
final public static Pattern NON_WORD_PATTERN(Code)
	`"\\W+"`; Divides text at non-letters (NOT Character.isLetter(c))

WHITESPACE_PATTERN
final public static Pattern WHITESPACE_PATTERN(Code)
	`"\\s+"`; Divides text at whitespaces (Character.isWhitespace(c))

Constructor Detail

PatternAnalyzer
public PatternAnalyzer(Pattern pattern, boolean toLowerCase, Set stopWords)(Code)
	Constructs a new instance with the given parameters. Parameters: pattern - a regular expression delimiting tokens Parameters: toLowerCase - if `true` returns tokens after applyingString.toLowerCase() Parameters: stopWords - if non-null, ignores all tokens that are contained in thegiven stop set (after previously having applied toLowerCase()if applicable). For example, created viaStopFilter.makeStopSet(String[])and/ororg.apache.lucene.analysis.WordlistLoaderas in`WordlistLoader.getWordSet(new File("samples/fulltext/stopwords.txt")`or other stop wordslists .

Method Detail

equals
public boolean equals(Object other)(Code)
	Indicates whether some other object is "equal to" this one. Parameters: other - the reference object with which to compare. true if equal, false otherwise

hashCode
public int hashCode()(Code)
	Returns a hash code value for the object. the hash code.

tokenStream
public TokenStream tokenStream(String fieldName, String text)(Code)
	Creates a token stream that tokenizes the given string into token terms (aka words). Parameters: fieldName - the name of the field to tokenize (currently ignored). Parameters: text - the string to tokenize a new token stream

tokenStream
public TokenStream tokenStream(String fieldName, Reader reader)(Code)
	Creates a token stream that tokenizes all the text in the given Reader; This implementation forwards to `tokenStream(String, String)` and is less efficient than `tokenStream(String, String)`. Parameters: fieldName - the name of the field to tokenize (currently ignored). Parameters: reader - the reader delivering the text a new token stream

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

public int getPositionIncrementGap(String fieldName)(Code)(Java Doc)
protected Object getPreviousTokenStream()(Code)(Java Doc)
public TokenStream reusableTokenStream(String fieldName, Reader reader) throws IOException(Code)(Java Doc)
protected void setPreviousTokenStream(Object obj)(Code)(Java Doc)
abstract public TokenStream tokenStream(String fieldName, Reader reader)(Code)(Java Doc)

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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