org.apache.solr.spelling

Class QueryConverter

java.lang.Object

org.apache.solr.spelling.QueryConverter

All Implemented Interfaces:

NamedListInitializedPlugin

Direct Known Subclasses:

SpellingQueryConverter

public abstract class QueryConverter
extends Object
implements NamedListInitializedPlugin

The QueryConverter is an abstract base class defining a method for converting input "raw" queries into a set of tokens for spell checking. It is used to "parse" the CommonParams.Q (the input query) and converts it to tokens.

It is only invoked for the CommonParams.Q parameter, and not the "spellcheck.q" parameter. Systems that use their own query parser or those that find issue with the basic implementation should implement their own QueryConverter instead of using the provided implementation (SpellingQueryConverter) by overriding the appropriate methods on the SpellingQueryConverter and registering it in the solrconfig.xml

Refer to SpellCheckComponent for more details

Since:

solr 1.3

Field Summary

Fields

Modifier and Type	Field and Description
protected Analyzer	analyzer
static int	PROHIBITED_TERM_FLAG This term is marked prohibited in the query with the minus sign.
static int	REQUIRED_TERM_FLAG This term is marked required in the query with the plus sign.
static int	TERM_IN_BOOLEAN_QUERY_FLAG This term exists in a query that contains boolean operators (AND/OR/NOT)
static int	TERM_PRECEDES_NEW_BOOLEAN_OPERATOR_FLAG This term is directly followed by a boolean operator (AND/OR/NOT) and this operator differs from the prior boolean operator in the query (this signifies this term is likely part of a different query clause than the next term in the query)

Constructor Summary

Constructors

Constructor and Description
QueryConverter()

Method Summary

Methods

Modifier and Type	Method and Description
abstract Collection<Token>	convert(String original) Returns the Collection of Tokens for the query.
Analyzer	getAnalyzer()
void	init(NamedList args)
void	setAnalyzer(Analyzer analyzer) Set the analyzer to use.

Methods inherited from class java.lang.Object

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

Field Detail

analyzer

protected Analyzer analyzer

PROHIBITED_TERM_FLAG

public static final int PROHIBITED_TERM_FLAG

This term is marked prohibited in the query with the minus sign.

See Also:

Constant Field Values

REQUIRED_TERM_FLAG

public static final int REQUIRED_TERM_FLAG

This term is marked required in the query with the plus sign.

See Also:

Constant Field Values

TERM_PRECEDES_NEW_BOOLEAN_OPERATOR_FLAG

public static final int TERM_PRECEDES_NEW_BOOLEAN_OPERATOR_FLAG

This term is directly followed by a boolean operator (AND/OR/NOT) and this operator differs from the prior boolean operator in the query (this signifies this term is likely part of a different query clause than the next term in the query)

See Also:

Constant Field Values

TERM_IN_BOOLEAN_QUERY_FLAG

public static final int TERM_IN_BOOLEAN_QUERY_FLAG

This term exists in a query that contains boolean operators (AND/OR/NOT)

See Also:

Constant Field Values

Constructor Detail

QueryConverter

public QueryConverter()

Method Detail

init

public void init(NamedList args)

Specified by:

init in interface NamedListInitializedPlugin

convert

public abstract Collection<Token> convert(String original)

Returns the Collection of Tokens for the query. Offsets on the Token should correspond to the correct offset in the origQuery

setAnalyzer

public void setAnalyzer(Analyzer analyzer)

Set the analyzer to use. Must be set before any calls to convert.

getAnalyzer

public Analyzer getAnalyzer()