Package org.drools.mvel.evaluators

Class DuringEvaluatorDefinition

java.lang.Object

org.drools.mvel.evaluators.DuringEvaluatorDefinition

All Implemented Interfaces:

Externalizable, Serializable, org.drools.compiler.rule.builder.EvaluatorDefinition, org.kie.api.runtime.rule.EvaluatorDefinition

public class DuringEvaluatorDefinition
extends Object
implements org.drools.compiler.rule.builder.EvaluatorDefinition

The implementation of the during evaluator definition.

The during evaluator correlates two events and matches when the current event happens during the occurrence of the event being correlated.

Lets look at an example:

$eventA : EventA( this during $eventB )

The previous pattern will match if and only if the $eventA starts after $eventB starts and finishes before $eventB finishes. In other words:

 $eventB.startTimestamp < $eventA.startTimestamp <= $eventA.endTimestamp < $eventB.endTimestamp 

The during operator accepts 1, 2 or 4 optional parameters as follow:

• If one value is defined, this will be the maximum distance between the start timestamp of both event and the maximum distance between the end timestamp of both events in order to operator match. Example:

$eventA : EventA( this during[ 5s ] $eventB )

Will match if and only if:

 
 0 < $eventA.startTimestamp - $eventB.startTimestamp <= 5s &&
 0 < $eventB.endTimestamp - $eventA.endTimestamp <= 5s
 

• If two values are defined, the first value will be the minimum distance between the timestamps of both events, while the second value will be the maximum distance between the timestamps of both events. Example:

$eventA : EventA( this during[ 5s, 10s ] $eventB )

Will match if and only if:

 
 5s <= $eventA.startTimestamp - $eventB.startTimestamp <= 10s &&
 5s <= $eventB.endTimestamp - $eventA.endTimestamp <= 10s
 

• If four values are defined, the first two values will be the minimum and maximum distances between the start timestamp of both events, while the last two values will be the minimum and maximum distances between the end timestamp of both events. Example:

$eventA : EventA( this during[ 2s, 6s, 4s, 10s ] $eventB )

Will match if and only if:

 
 2s <= $eventA.startTimestamp - $eventB.startTimestamp <= 6s &&
 4s <= $eventB.endTimestamp - $eventA.endTimestamp <= 10s
 

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	DuringEvaluatorDefinition.DuringEvaluator	Implements the 'during' evaluator itself

Nested classes/interfaces inherited from interface org.drools.compiler.rule.builder.EvaluatorDefinition

org.drools.compiler.rule.builder.EvaluatorDefinition.Target

Field Summary

Fields

Modifier and Type	Field	Description
static org.drools.drl.parser.impl.Operator	DURING
static String	duringOp
static org.drools.drl.parser.impl.Operator	NOT_DURING

Constructor Summary

Constructors

Constructor	Description
DuringEvaluatorDefinition()

Method Summary

Modifier and Type	Method	Description
org.drools.core.rule.accessor.Evaluator	getEvaluator(org.drools.core.base.ValueType type, String operatorId, boolean isNegated, String parameterText)
org.drools.core.rule.accessor.Evaluator	getEvaluator(org.drools.core.base.ValueType type, String operatorId, boolean isNegated, String parameterText, org.drools.compiler.rule.builder.EvaluatorDefinition.Target left, org.drools.compiler.rule.builder.EvaluatorDefinition.Target right)
org.drools.core.rule.accessor.Evaluator	getEvaluator(org.drools.core.base.ValueType type, org.drools.drl.parser.impl.Operator operator)
org.drools.core.rule.accessor.Evaluator	getEvaluator(org.drools.core.base.ValueType type, org.drools.drl.parser.impl.Operator operator, String parameterText)
String[]	getEvaluatorIds()
org.drools.compiler.rule.builder.EvaluatorDefinition.Target	getTarget()
boolean	isNegatable()
void	readExternal(ObjectInput in)
boolean	supportsType(org.drools.core.base.ValueType type)
void	writeExternal(ObjectOutput out)

Methods inherited from class java.lang.Object

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

Field Detail

duringOp

public static final String duringOp

DURING

public static final org.drools.drl.parser.impl.Operator DURING

NOT_DURING

public static final org.drools.drl.parser.impl.Operator NOT_DURING

Constructor Detail

DuringEvaluatorDefinition

public DuringEvaluatorDefinition()

Method Detail

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
                         ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

getEvaluator

public org.drools.core.rule.accessor.Evaluator getEvaluator(org.drools.core.base.ValueType type,
                                                            org.drools.drl.parser.impl.Operator operator)

Specified by:

getEvaluator in interface org.drools.compiler.rule.builder.EvaluatorDefinition

getEvaluator

public org.drools.core.rule.accessor.Evaluator getEvaluator(org.drools.core.base.ValueType type,
                                                            org.drools.drl.parser.impl.Operator operator,
                                                            String parameterText)

Specified by:

getEvaluator in interface org.drools.compiler.rule.builder.EvaluatorDefinition

getEvaluator

public org.drools.core.rule.accessor.Evaluator getEvaluator(org.drools.core.base.ValueType type,
                                                            String operatorId,
                                                            boolean isNegated,
                                                            String parameterText)

Specified by:

getEvaluator in interface org.drools.compiler.rule.builder.EvaluatorDefinition

getEvaluator

public org.drools.core.rule.accessor.Evaluator getEvaluator(org.drools.core.base.ValueType type,
                                                            String operatorId,
                                                            boolean isNegated,
                                                            String parameterText,
                                                            org.drools.compiler.rule.builder.EvaluatorDefinition.Target left,
                                                            org.drools.compiler.rule.builder.EvaluatorDefinition.Target right)

Specified by:

getEvaluator in interface org.drools.compiler.rule.builder.EvaluatorDefinition

getEvaluatorIds

public String[] getEvaluatorIds()

Specified by:

getEvaluatorIds in interface org.drools.compiler.rule.builder.EvaluatorDefinition

isNegatable

public boolean isNegatable()

Specified by:

isNegatable in interface org.drools.compiler.rule.builder.EvaluatorDefinition

getTarget

public org.drools.compiler.rule.builder.EvaluatorDefinition.Target getTarget()

Specified by:

getTarget in interface org.drools.compiler.rule.builder.EvaluatorDefinition

supportsType

public boolean supportsType(org.drools.core.base.ValueType type)

Specified by:

supportsType in interface org.drools.compiler.rule.builder.EvaluatorDefinition