no.sesat.search.query.token
Class DeadTokenEvaluationEngineImpl

java.lang.Object
  no.sesat.search.query.token.TokenEvaluationEngineImpl
      no.sesat.search.query.token.DeadTokenEvaluationEngineImpl

All Implemented Interfaces:

TokenEvaluationEngine

public final class DeadTokenEvaluationEngineImpl
extends TokenEvaluationEngineImpl

A dead evaluation engine. Used when evaluation is turned off. Rather than solely relying on the ALWAYS_FALSE_EVALUTOR evaluate(..) always throws a EvaluationRuntimeException that is treated as a false evaluation but also prevents the evaluation for being cached by clauses (which are implemented within the flyweight pattern).

Version:

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

Nested Class Summary

Nested classes/interfaces inherited from interface no.sesat.search.query.token.TokenEvaluationEngine

TokenEvaluationEngine.Context, TokenEvaluationEngine.State

Field Summary

Fields inherited from interface no.sesat.search.query.token.TokenEvaluationEngine

ALWAYS_FALSE_EVALUATOR, ALWAYS_TRUE_EVALUATOR, DEAD_EVALUATOR

Constructor Summary

DeadTokenEvaluationEngineImpl(TokenEvaluationEngine.Context cxt)

Method Summary

boolean	evaluate(TokenPredicate token) The real evaluation method all other evaluate...(..) methods will delegate to.
TokenEvaluator	getEvaluator(TokenPredicate token) Find or create the TokenEvaluator that will evaluate if given (Token)Predicate is true.

Methods inherited from class no.sesat.search.query.token.TokenEvaluationEngineImpl

evaluateClause, evaluateQuery, evaluateTerm, getQueryString, getSite, getState, setState

Methods inherited from class java.lang.Object

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

Constructor Detail

DeadTokenEvaluationEngineImpl

public DeadTokenEvaluationEngineImpl(TokenEvaluationEngine.Context cxt)

Method Detail

getEvaluator

public TokenEvaluator getEvaluator(TokenPredicate token)
                            throws EvaluationException

Description copied from interface: TokenEvaluationEngine

Find or create the TokenEvaluator that will evaluate if given (Token)Predicate is true.

Specified by:

getEvaluator in interface TokenEvaluationEngine

Overrides:

getEvaluator in class TokenEvaluationEngineImpl

Returns:

Throws:

EvaluationException - if something goes wrong constructing or finding an appropriate evaluator.

evaluate

public boolean evaluate(TokenPredicate token)

Description copied from interface: TokenEvaluationEngine

The real evaluation method all other evaluate...(..) methods will delegate to.

Specified by:

evaluate in interface TokenEvaluationEngine

Overrides:

evaluate in class TokenEvaluationEngineImpl

Returns: