com.massa.mrules.operator.evaluation

Class NULL

java.lang.Object

com.massa.mrules.base.AbstractMRulesObject

com.massa.mrules.addon.AbstractAddon

com.massa.mrules.operator.evaluation.AbstractEvaluationOperator

com.massa.mrules.operator.evaluation.NULL

All Implemented Interfaces:

IAddon, IMRulesObject, IEvaluationOperator, Outable, Serializable, Cloneable

public class NULL
extends AbstractEvaluationOperator

Checks that source value is not null.
Provided condition should have no reference value (it will be ignored).

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static String	NULL_ID

Constructor Summary

Constructors

Constructor and Description
NULL()

Method Summary

Modifier and Type	Method and Description
boolean	evaluate(IExecutionContext ctxt, IEvaluationCondition condition) Evaluate result for this operator.
String	getImplementationId() Unique addon implementation ID.
IEvaluationOperator	getInverted() Returns a new instance instance of Evaluation operator, allowing to invert the operands.
IEvaluationOperator	getNegated() Returns a new instance instance of Evaluation operator, allowing to negate the operands.
Class<?>	getReferenceExpectedType(Class<?> srcType, Class<?> srcGenericType) Returns null in basic implementation.
String	getRepresentation() String representation for human read

Methods inherited from class com.massa.mrules.operator.evaluation.AbstractEvaluationOperator

clone, compile, compileOperator, equals, getReferencePreferredType, getSourceExpectedType, hashCode, toString

Methods inherited from class com.massa.mrules.addon.AbstractAddon

getInternalCacheIdentifier, isCacheUsed, isInternalCacheIdentifierNeeded, optimize, resetCachedData, setInternalCacheIdentifier, toString, wasRegistered

Methods inherited from class com.massa.mrules.base.AbstractMRulesObject

getDebugInfo, getDescription, getName, setDebugInfo, setDescription, setName

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.massa.mrules.addon.IAddon

getInternalCacheIdentifier, isCacheUsed, isInternalCacheIdentifierNeeded, optimize, resetCachedData, setInternalCacheIdentifier, wasRegistered

Methods inherited from interface com.massa.mrules.base.IMRulesObject

getDebugInfo, getDescription, getName, setDebugInfo, setDescription, setName

Field Detail

NULL_ID

public static final String NULL_ID

See Also:

Constant Field Values

Constructor Detail

NULL

public NULL()

Method Detail

evaluate

public boolean evaluate(IExecutionContext ctxt,
                        IEvaluationCondition condition)
                 throws MConditionEvaluationException

Description copied from interface: IEvaluationOperator

Evaluate result for this operator.

Throws:

MConditionEvaluationException

getInverted

public IEvaluationOperator getInverted()

Description copied from interface: IEvaluationOperator

Returns a new instance instance of Evaluation operator, allowing to invert the operands.
For example, "a < b" inverted gives "b > a", and is strictly equivalent.
This feature is used by optimization process, so a null result by default while the operator could be inverted might lead to less efficient performance.

Returns:

new operator instance or null if inversion is not possible.

getNegated

public IEvaluationOperator getNegated()

Description copied from interface: IEvaluationOperator

Returns a new instance instance of Evaluation operator, allowing to negate the operands.
For example, "a < b" negated gives "a >= b", and is strictly equivalent to "! (a < b)". This feature is used by optimization process, so a null result by default while the operator could be negated might lead to less efficient performance.

Returns:

new operator instance or null if negation is not possible.

getRepresentation

public String getRepresentation()

Description copied from interface: IEvaluationOperator

String representation for human read

getImplementationId

public String getImplementationId()

Description copied from interface: IAddon

Unique addon implementation ID. In case of conflict, an Class Initialization error will be raised.

getReferenceExpectedType

public Class<?> getReferenceExpectedType(Class<?> srcType,
                                         Class<?> srcGenericType)

Description copied from class: AbstractEvaluationOperator

Returns null in basic implementation.

Specified by:

getReferenceExpectedType in interface IEvaluationOperator

Overrides:

getReferenceExpectedType in class AbstractEvaluationOperator

Parameters:

srcType - If known, the source accessor type should be provided to make better prevision.

srcGenericType - If known, the source accessor generic type should be provided to make better prevision.