org.apache.solr.spelling

Class SpellingQueryConverter

java.lang.Object

org.apache.solr.spelling.QueryConverter

org.apache.solr.spelling.SpellingQueryConverter

All Implemented Interfaces:

NamedListInitializedPlugin

Direct Known Subclasses:

SuggestQueryConverter

public class SpellingQueryConverter
extends QueryConverter

Converts the query string to a Collection of Lucene tokens using a regular expression. Boolean operators AND, OR, NOT are skipped. Each term is checked to determine if it is optional, required or prohibited. Required terms output a Token with the QueryConverter.REQUIRED_TERM_FLAG set. Prohibited terms output a Token with the QueryConverter.PROHIBITED_TERM_FLAG set. If the query uses the plus (+) and minus (-) to denote required and prohibited, this determination will be accurate. In the case boolean AND/OR/NOTs are used, this converter makes an uninformed guess as to whether the term would likely behave as if it is Required or Prohibited and sets the flags accordingly. These flags are used downstream to generate collations for WordBreakSolrSpellChecker, in cases where an original term is split up into multiple Tokens.

Since:

solr 1.3

Field Summary

Fields

Modifier and Type	Field and Description
protected Pattern	QUERY_REGEX

Fields inherited from class org.apache.solr.spelling.QueryConverter

analyzer, PROHIBITED_TERM_FLAG, REQUIRED_TERM_FLAG, TERM_IN_BOOLEAN_QUERY_FLAG, TERM_PRECEDES_NEW_BOOLEAN_OPERATOR_FLAG

Constructor Summary

Constructors

Constructor and Description
SpellingQueryConverter()

Method Summary

Modifier and Type	Method and Description
protected void	analyze(Collection<Token> result, String text, int offset, int flagsAttValue)
Collection<Token>	convert(String original) Converts the original query string to a collection of Lucene Tokens.

Methods inherited from class org.apache.solr.spelling.QueryConverter

getAnalyzer, init, setAnalyzer

Methods inherited from class java.lang.Object

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

Field Detail

QUERY_REGEX

protected Pattern QUERY_REGEX

Constructor Detail

SpellingQueryConverter

public SpellingQueryConverter()

Method Detail

convert

public Collection<Token> convert(String original)

Converts the original query string to a collection of Lucene Tokens.

Specified by:

convert in class QueryConverter

Parameters:

original - the original query string

Returns:

a Collection of Lucene Tokens

analyze

protected void analyze(Collection<Token> result,
                       String text,
                       int offset,
                       int flagsAttValue)
                throws IOException

Throws:

IOException