Package org.drools.mvel.evaluators

Class StrEvaluatorDefinition.StrEvaluator

java.lang.Object

org.drools.mvel.evaluators.BaseEvaluator

org.drools.mvel.evaluators.StrEvaluatorDefinition.StrEvaluator

All Implemented Interfaces:

Externalizable, Serializable, org.drools.base.rule.accessor.Evaluator, MvelEvaluator, Evaluator

Enclosing class:

StrEvaluatorDefinition

public static class StrEvaluatorDefinition.StrEvaluator
extends BaseEvaluator

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
StrEvaluator()
StrEvaluator(org.drools.base.base.ValueType type, boolean isNegated)

Method Summary

Modifier and Type	Method	Description
boolean	evaluate(org.drools.base.base.ValueResolver valueResolver, org.drools.base.rule.accessor.ReadAccessor extractor, FactHandle factHandle, org.drools.base.rule.accessor.FieldValue value)
boolean	evaluate(org.drools.base.base.ValueResolver valueResolver, org.drools.base.rule.accessor.ReadAccessor leftExtractor, FactHandle left, org.drools.base.rule.accessor.ReadAccessor rightExtractor, FactHandle right)
boolean	evaluateCachedLeft(org.drools.base.base.ValueResolver valueResolver, VariableRestriction.VariableContextEntry context, FactHandle right)	Evaluates the expression using the provided parameters.
boolean	evaluateCachedRight(org.drools.base.base.ValueResolver valueResolver, VariableRestriction.VariableContextEntry context, FactHandle left)	Evaluates the expression using the provided parameters.
StrEvaluatorDefinition.Operations	getParameter()
void	setParameterText(String parameterText)
String	toString()

Methods inherited from class org.drools.mvel.evaluators.BaseEvaluator

equals, getCoercedValueType, getInterval, getOperator, getValueType, hashCode, isTemporal, readExternal, writeExternal

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

StrEvaluator

public StrEvaluator()

StrEvaluator

public StrEvaluator(org.drools.base.base.ValueType type,
 boolean isNegated)

Method Details

setParameterText

public void setParameterText(String parameterText)

getParameter

public StrEvaluatorDefinition.Operations getParameter()

evaluate

public boolean evaluate(org.drools.base.base.ValueResolver valueResolver,
 org.drools.base.rule.accessor.ReadAccessor extractor,
 FactHandle factHandle,
 org.drools.base.rule.accessor.FieldValue value)

evaluate

public boolean evaluate(org.drools.base.base.ValueResolver valueResolver,
 org.drools.base.rule.accessor.ReadAccessor leftExtractor,
 FactHandle left,
 org.drools.base.rule.accessor.ReadAccessor rightExtractor,
 FactHandle right)

evaluateCachedLeft

public boolean evaluateCachedLeft(org.drools.base.base.ValueResolver valueResolver,
 VariableRestriction.VariableContextEntry context,
 FactHandle right)

Description copied from interface: MvelEvaluator

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

public boolean evaluateCachedRight(org.drools.base.base.ValueResolver valueResolver,
 VariableRestriction.VariableContextEntry context,
 FactHandle left)

Description copied from interface: MvelEvaluator

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.

toString

public String toString()

Overrides:

toString in class BaseEvaluator