Package org.drools.mvel.evaluators

Class PointInTimeEvaluator

java.lang.Object

org.drools.mvel.evaluators.BaseEvaluator

org.drools.mvel.evaluators.PointInTimeEvaluator

All Implemented Interfaces:

Externalizable, Serializable, org.drools.core.rule.accessor.Evaluator, MvelEvaluator, org.kie.api.runtime.rule.Evaluator

Direct Known Subclasses:

AfterEvaluatorDefinition.AfterEvaluator, BeforeEvaluatorDefinition.BeforeEvaluator

public abstract class PointInTimeEvaluator
extends BaseEvaluator

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected long	finalRange
protected long	initRange
protected String	paramText
protected boolean	unwrapLeft
protected boolean	unwrapRight

Constructor Summary

Constructors

Constructor	Description
PointInTimeEvaluator()
PointInTimeEvaluator(org.drools.core.base.ValueType type, org.drools.drl.parser.impl.Operator operator, long[] parameters, String paramText, boolean unwrapLeft, boolean unwrapRight)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
protected abstract boolean	evaluate(long rightTS, long leftTS)
boolean	evaluate(org.drools.core.common.ReteEvaluator reteEvaluator, org.drools.core.rule.accessor.ReadAccessor extractor, org.drools.core.common.InternalFactHandle object1, org.drools.core.rule.accessor.FieldValue object2)
boolean	evaluate(org.drools.core.common.ReteEvaluator reteEvaluator, org.drools.core.rule.accessor.ReadAccessor extractor1, org.drools.core.common.InternalFactHandle handle1, org.drools.core.rule.accessor.ReadAccessor extractor2, org.drools.core.common.InternalFactHandle handle2)
boolean	evaluateCachedLeft(org.drools.core.common.ReteEvaluator reteEvaluator, VariableRestriction.VariableContextEntry context, org.drools.core.common.InternalFactHandle right)	Evaluates the expression using the provided parameters.
boolean	evaluateCachedRight(org.drools.core.common.ReteEvaluator reteEvaluator, VariableRestriction.VariableContextEntry context, org.drools.core.common.InternalFactHandle left)	Evaluates the expression using the provided parameters.
protected abstract long	getLeftTimestamp(org.drools.core.common.InternalFactHandle handle)
protected abstract long	getRightTimestamp(org.drools.core.common.InternalFactHandle handle)
int	hashCode()
boolean	isTemporal()
void	readExternal(ObjectInput in)
String	toString()
void	writeExternal(ObjectOutput out)

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

getCoercedValueType, getInterval, getOperator, getValueType

Methods inherited from class java.lang.Object

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

Field Detail

initRange

protected long initRange

finalRange

protected long finalRange

paramText

protected String paramText

unwrapLeft

protected boolean unwrapLeft

unwrapRight

protected boolean unwrapRight

Constructor Detail

PointInTimeEvaluator

public PointInTimeEvaluator()

PointInTimeEvaluator

public PointInTimeEvaluator(org.drools.core.base.ValueType type,
                            org.drools.drl.parser.impl.Operator operator,
                            long[] parameters,
                            String paramText,
                            boolean unwrapLeft,
                            boolean unwrapRight)

Method Detail

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Overrides:

readExternal in class BaseEvaluator

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Overrides:

writeExternal in class BaseEvaluator

Throws:

IOException

isTemporal

public boolean isTemporal()

Specified by:

isTemporal in interface org.drools.core.rule.accessor.Evaluator

Specified by:

isTemporal in interface org.kie.api.runtime.rule.Evaluator

Overrides:

isTemporal in class BaseEvaluator

evaluate

protected abstract boolean evaluate(long rightTS,
                                    long leftTS)

getLeftTimestamp

protected abstract long getLeftTimestamp(org.drools.core.common.InternalFactHandle handle)

getRightTimestamp

protected abstract long getRightTimestamp(org.drools.core.common.InternalFactHandle handle)

evaluate

public boolean evaluate(org.drools.core.common.ReteEvaluator reteEvaluator,
                        org.drools.core.rule.accessor.ReadAccessor extractor,
                        org.drools.core.common.InternalFactHandle object1,
                        org.drools.core.rule.accessor.FieldValue object2)

evaluateCachedLeft

public boolean evaluateCachedLeft(org.drools.core.common.ReteEvaluator reteEvaluator,
                                  VariableRestriction.VariableContextEntry context,
                                  org.drools.core.common.InternalFactHandle 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:

reteEvaluator - 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.core.common.ReteEvaluator reteEvaluator,
                                   VariableRestriction.VariableContextEntry context,
                                   org.drools.core.common.InternalFactHandle 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:

reteEvaluator - 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.

evaluate

public boolean evaluate(org.drools.core.common.ReteEvaluator reteEvaluator,
                        org.drools.core.rule.accessor.ReadAccessor extractor1,
                        org.drools.core.common.InternalFactHandle handle1,
                        org.drools.core.rule.accessor.ReadAccessor extractor2,
                        org.drools.core.common.InternalFactHandle handle2)

hashCode

public int hashCode()

Overrides:

hashCode in class BaseEvaluator

equals

public boolean equals(Object obj)

Overrides:

equals in class BaseEvaluator

toString

public String toString()

Overrides:

toString in class BaseEvaluator