org.apache.lucene.analysis.pattern

Class PatternTokenizerFactory

java.lang.Object

org.apache.lucene.analysis.util.AbstractAnalysisFactory

org.apache.lucene.analysis.util.TokenizerFactory

org.apache.lucene.analysis.pattern.PatternTokenizerFactory

public class PatternTokenizerFactory
extends TokenizerFactory

Factory for PatternTokenizer. This tokenizer uses regex pattern matching to construct distinct tokens for the input stream. It takes two arguments: "pattern" and "group".

• "pattern" is the regular expression.
• "group" says which group to extract into tokens.

group=-1 (the default) is equivalent to "split". In this case, the tokens will be equivalent to the output from (without empty tokens): String.split(java.lang.String)

Using group >= 0 selects the matching group as the token. For example, if you have:

  pattern = \'([^\']+)\'
  group = 0
  input = aaa 'bbb' 'ccc'

the output will be two tokens: 'bbb' and 'ccc' (including the ' marks). With the same input but using group=1, the output would be: bbb and ccc (no ' marks)

NOTE: This Tokenizer does not output tokens that are of zero length.

 <fieldType name="text_ptn" class="solr.TextField" positionIncrementGap="100">
   <analyzer>
     <tokenizer class="solr.PatternTokenizerFactory" pattern="\'([^\']+)\'" group="1"/>
   </analyzer>
 </fieldType>

Since:

solr1.2

See Also:

PatternTokenizer

Field Summary

Fields

Modifier and Type	Field and Description
protected int	group
static String	GROUP
protected Pattern	pattern
static String	PATTERN

Fields inherited from class org.apache.lucene.analysis.util.AbstractAnalysisFactory

args, luceneMatchVersion

Constructor Summary

Constructors

Constructor and Description
PatternTokenizerFactory()

Method Summary

Methods

Modifier and Type	Method and Description
Tokenizer	create(Reader in) Split the input using configured pattern
void	init(Map<String,String> args) Require a configured pattern

Methods inherited from class org.apache.lucene.analysis.util.TokenizerFactory

availableTokenizers, forName, lookupClass, reloadTokenizers

Methods inherited from class org.apache.lucene.analysis.util.AbstractAnalysisFactory

assureMatchVersion, getArgs, getBoolean, getBoolean, getInt, getInt, getInt, getLines, getLuceneMatchVersion, getPattern, getSnowballWordSet, getWordSet, setLuceneMatchVersion, splitFileNames

Methods inherited from class java.lang.Object

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

Field Detail

PATTERN

public static final String PATTERN

See Also:

Constant Field Values

GROUP

public static final String GROUP

See Also:

Constant Field Values

pattern

protected Pattern pattern

group

protected int group

Constructor Detail

PatternTokenizerFactory

public PatternTokenizerFactory()

Method Detail

init

public void init(Map<String,String> args)

Require a configured pattern

Overrides:

init in class AbstractAnalysisFactory

create

public Tokenizer create(Reader in)

Split the input using configured pattern

Specified by:

create in class TokenizerFactory