no.sesat.search.query.token
Class RegExpTokenEvaluator

java.lang.Object
  no.sesat.search.query.token.RegExpTokenEvaluator

All Implemented Interfaces:

TokenEvaluator

public final class RegExpTokenEvaluator
extends Object
implements TokenEvaluator

An implementation of TokenEvaluator which uses a set of Pattern to decide if a token occurs in a query. Immutable

Version:

$Id: RegExpTokenEvaluator.java 7225 2009-04-09 00:32:20Z ssmiweve $

Constructor Summary

RegExpTokenEvaluator(Collection<Pattern> expressions, boolean queryDependant)
Create a new RegExpTokenEvaluator.

Method Summary

boolean	evaluateToken(TokenPredicate token, String term, String query) Returns true if any of the patterns matches the query.
Set<String>	getMatchValues(TokenPredicate token, String term) Each true evaluation may also provide a synonym (or "match value").
boolean	isQueryDependant(TokenPredicate predicate)

Methods inherited from class java.lang.Object

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

Constructor Detail

RegExpTokenEvaluator

public RegExpTokenEvaluator(Collection<Pattern> expressions,
                            boolean queryDependant)

Create a new RegExpTokenEvaluator.

Parameters:

expressions - the patterns to use. Elements of collection must be Pattern.

queryDependant -

Method Detail

evaluateToken

public boolean evaluateToken(TokenPredicate token,
                             String term,
                             String query)

Returns true if any of the patterns matches the query. Wraps to evaluateToken with exactMatchRequired == false

Specified by:

evaluateToken in interface TokenEvaluator

Parameters:

token - not used by this implementation.

term - the term currently parsing.

query - the query to find matches in. can be null. this indicates we can just use the term.

Returns:

true if any of the patterns matches.

isQueryDependant

public boolean isQueryDependant(TokenPredicate predicate)

Specified by:

isQueryDependant in interface TokenEvaluator

Returns:

getMatchValues

public Set<String> getMatchValues(TokenPredicate token,
                                  String term)

Description copied from interface: TokenEvaluator

Each true evaluation may also provide a synonym (or "match value").

Specified by:

getMatchValues in interface TokenEvaluator

Returns:

a list of Tokens