Package org.drools.mvel.evaluators

Interface MvelEvaluator

All Superinterfaces:

org.drools.base.rule.accessor.Evaluator, org.kie.api.runtime.rule.Evaluator, java.io.Serializable

All Known Implementing Classes:

AfterEvaluatorDefinition.AfterEvaluator, BaseEvaluator, BeforeEvaluatorDefinition.BeforeEvaluator, CoincidesEvaluatorDefinition.CoincidesEvaluator, DuringEvaluatorDefinition.DuringEvaluator, FinishedByEvaluatorDefinition.FinishedByEvaluator, FinishesEvaluatorDefinition.FinishesEvaluator, IncludesEvaluatorDefinition.IncludesEvaluator, MatchesEvaluatorsDefinition.StringMatchesEvaluator, MatchesEvaluatorsDefinition.StringNotMatchesEvaluator, MeetsEvaluatorDefinition.MeetsEvaluator, MetByEvaluatorDefinition.MetByEvaluator, OverlappedByEvaluatorDefinition.OverlappedByEvaluator, OverlapsEvaluatorDefinition.OverlapsEvaluator, PointInTimeEvaluator, SetEvaluatorsDefinition.ArrayContainsEvaluator, SetEvaluatorsDefinition.ArrayExcludesEvaluator, SetEvaluatorsDefinition.BaseMemberOfEvaluator, SetEvaluatorsDefinition.BaseNotMemberOfEvaluator, SetEvaluatorsDefinition.BigDecimalMemberOfEvaluator, SetEvaluatorsDefinition.BigDecimalNotMemberOfEvaluator, SetEvaluatorsDefinition.BigIntegerMemberOfEvaluator, SetEvaluatorsDefinition.BigIntegerNotMemberOfEvaluator, SetEvaluatorsDefinition.BooleanMemberOfEvaluator, SetEvaluatorsDefinition.BooleanNotMemberOfEvaluator, SetEvaluatorsDefinition.ByteMemberOfEvaluator, SetEvaluatorsDefinition.ByteNotMemberOfEvaluator, SetEvaluatorsDefinition.CharacterMemberOfEvaluator, SetEvaluatorsDefinition.CharacterNotMemberOfEvaluator, SetEvaluatorsDefinition.DateMemberOfEvaluator, SetEvaluatorsDefinition.DateNotMemberOfEvaluator, SetEvaluatorsDefinition.DoubleMemberOfEvaluator, SetEvaluatorsDefinition.DoubleNotMemberOfEvaluator, SetEvaluatorsDefinition.FloatMemberOfEvaluator, SetEvaluatorsDefinition.FloatNotMemberOfEvaluator, SetEvaluatorsDefinition.IntegerMemberOfEvaluator, SetEvaluatorsDefinition.IntegerNotMemberOfEvaluator, SetEvaluatorsDefinition.LongMemberOfEvaluator, SetEvaluatorsDefinition.LongNotMemberOfEvaluator, SetEvaluatorsDefinition.ObjectContainsEvaluator, SetEvaluatorsDefinition.ObjectExcludesEvaluator, SetEvaluatorsDefinition.ObjectMemberOfEvaluator, SetEvaluatorsDefinition.ObjectNotMemberOfEvaluator, SetEvaluatorsDefinition.ShortMemberOfEvaluator, SetEvaluatorsDefinition.ShortNotMemberOfEvaluator, SetEvaluatorsDefinition.StringMemberOfEvaluator, SetEvaluatorsDefinition.StringNotMemberOfEvaluator, SoundslikeEvaluatorsDefinition.StringNotSoundsLikeEvaluator, SoundslikeEvaluatorsDefinition.StringSoundsLikeEvaluator, StartedByEvaluatorDefinition.StartedByEvaluator, StartsEvaluatorDefinition.StartsEvaluator, StrEvaluatorDefinition.StrEvaluator

public interface MvelEvaluator
extends org.drools.base.rule.accessor.Evaluator

Method Summary

Modifier and Type	Method	Description
boolean	evaluateCachedLeft(org.drools.base.base.ValueResolver valueResolver, VariableRestriction.VariableContextEntry context, org.kie.api.runtime.rule.FactHandle right)	Evaluates the expression using the provided parameters.
boolean	evaluateCachedRight(org.drools.base.base.ValueResolver valueResolver, VariableRestriction.VariableContextEntry context, org.kie.api.runtime.rule.FactHandle left)	Evaluates the expression using the provided parameters.

Methods inherited from interface org.drools.base.rule.accessor.Evaluator

evaluate, evaluate, getCoercedValueType, getInterval, getOperator, getValueType, isTemporal

Method Detail

evaluateCachedLeft

boolean evaluateCachedLeft(org.drools.base.base.ValueResolver valueResolver,
                           VariableRestriction.VariableContextEntry context,
                           org.kie.api.runtime.rule.FactHandle right)

Evaluates the expression using the provided parameters. This method is used when evaluating left-activated beta-constraints, i.e., a fact attribute against a variable value, that is activated from the left. For instance: Person( name == $someName ) This method will be used when a new $someName variable is bound. So it will cache the value of $someName and will iterate over the right memory (Person instances) evaluating each occurrence.

Parameters:

valueResolver - The current working memory

context - The previously cached context, including the left value and the extractor for the right value.

right - The right object, from where to extract the value. In the above example, that is the "Person" instance from where to extract the "name" attribute.

Returns:

Returns true if evaluation is successful. false otherwise.

evaluateCachedRight

boolean evaluateCachedRight(org.drools.base.base.ValueResolver valueResolver,
                            VariableRestriction.VariableContextEntry context,
                            org.kie.api.runtime.rule.FactHandle left)

Evaluates the expression using the provided parameters. This method is used when evaluating right-activated beta-constraints, i.e., a fact attribute against a variable value, that is activated from the right. For instance: Person( name == $someName ) This method will be used when a new Person instance is evaluated. So it will cache the value of the "Person" instance and will iterate over the left memory comparing it to each "$someName" bound values.

Parameters:

valueResolver - The current working memory

context - The previously cached context, including the right value and the extractor for the left value.

left - The left object, from where to extract the bound variable. In the above example, that is the "$someName" variable value.

Returns:

Returns true if evaluation is successful. false otherwise.