com.massa.mrules.accessor

Class MNullIfEmptyAccessor

java.lang.Object

com.massa.mrules.base.AbstractMRulesObject

com.massa.mrules.addon.AbstractAddon

com.massa.mrules.accessor.AbstractReadAccessor

com.massa.mrules.accessor.AbstractReadSourceAccessor

com.massa.mrules.accessor.MNullIfEmptyAccessor

All Implemented Interfaces:

IAccessor, IAccessorValueHandler, IReadAccessor, IAddon, IMRulesObject, Outable, Serializable, Cloneable

public class MNullIfEmptyAccessor
extends AbstractReadSourceAccessor

Class that allows to check if an Array, a String (or CharSequence) or a Collection is empty and if so, return null instead.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface com.massa.mrules.accessor.IReadAccessor

IReadAccessor.Standalone

Field Summary

Fields

Modifier and Type	Field and Description
static String	NULLIFEMPTY_ID

Fields inherited from class com.massa.mrules.accessor.AbstractReadSourceAccessor

internalExpectedGenericType, internalExpectedType, source

Constructor Summary

Constructors

Constructor and Description
MNullIfEmptyAccessor()
MNullIfEmptyAccessor(IReadAccessor source)

Method Summary

Modifier and Type	Method and Description
<G,C extends Collection<G>> void	compileCollection(ICompilationContext ctxt, Class<C> expectedType, Class<G> expectedGenericType) Implementation to handle case when expected result is a Collection.
void	compileValue(ICompilationContext ctxt, Class<?> expectedType) Implementation to handle case when expected result is a single value.
Class<?>[]	getGenericTypes(IContext ctxt) By default, creates a 1 cell array with IAccessor.getGenericCollectionType(IContext) return value if any, or null if no value.
String	getImplementationId() Unique addon implementation ID.
protected boolean	parseCollections() Always false.
Object	specificHandleValue(IExecutionContext ctxt, Object value) Override this to apply specific transformation on value read from source accessor.
void	toString(OuterWithLevel outer) Method used to send String representation of the current object to the OuterWithLevel.

Methods inherited from class com.massa.mrules.accessor.AbstractReadSourceAccessor

clone, equals, getEstimatedReadCost, getGenericCollectionType, getInternalCacheIdentifier, getSource, getType, handleValue, hashCode, internalGet, isCacheUsed, isConstantValue, isInternalCacheIdentifierNeeded, isShouldIterate, resetCachedData, setInternalCacheIdentifier, setSource, wasRegistered

Methods inherited from class com.massa.mrules.accessor.AbstractReadAccessor

castToExpected, compileRead, compileRead, compileRead, compileRead, get, isShouldBeWrappedToConstantValue, isShouldNotCache

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

optimize, toString

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

optimize

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

getDebugInfo, getDescription, getName, setDebugInfo, setDescription, setName

Field Detail

NULLIFEMPTY_ID

public static final String NULLIFEMPTY_ID

See Also:

Constant Field Values

Constructor Detail

MNullIfEmptyAccessor

public MNullIfEmptyAccessor()

MNullIfEmptyAccessor

public MNullIfEmptyAccessor(IReadAccessor source)

Method Detail

compileValue

public void compileValue(ICompilationContext ctxt,
                         Class<?> expectedType)
                  throws MRuleValidationException

Description copied from class: AbstractReadAccessor

Implementation to handle case when expected result is a single value.

Specified by:

compileValue in class AbstractReadAccessor

Throws:

MRuleValidationException

compileCollection

public <G,C extends Collection<G>> void compileCollection(ICompilationContext ctxt,
                                                          Class<C> expectedType,
                                                          Class<G> expectedGenericType)
                                                   throws MRuleValidationException

Description copied from class: AbstractReadAccessor

Implementation to handle case when expected result is a Collection.

Specified by:

compileCollection in class AbstractReadAccessor

Throws:

MRuleValidationException

parseCollections

protected boolean parseCollections()

Always false.

Specified by:

parseCollections in class AbstractReadSourceAccessor

specificHandleValue

public Object specificHandleValue(IExecutionContext ctxt,
                                  Object value)
                           throws MAccessorException

Description copied from class: AbstractReadSourceAccessor

Override this to apply specific transformation on value read from source accessor.

Specified by:

specificHandleValue in class AbstractReadSourceAccessor

Throws:

MAccessorException

getGenericTypes

public Class<?>[] getGenericTypes(IContext ctxt)
                           throws MAccessorException

Description copied from class: AbstractReadAccessor

By default, creates a 1 cell array with IAccessor.getGenericCollectionType(IContext) return value if any, or null if no value.

Specified by:

getGenericTypes in interface IAccessor

Overrides:

getGenericTypes in class AbstractReadAccessor

Throws:

MAccessorException

getImplementationId

public String getImplementationId()

Description copied from interface: IAddon

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

toString

public void toString(OuterWithLevel outer)
              throws IOException

Description copied from interface: Outable

Method used to send String representation of the current object to the OuterWithLevel.

Specified by:

toString in interface Outable

Overrides:

toString in class AbstractReadSourceAccessor

Throws:

IOException