com.massa.mrules.accessor

Class MCountAccessor

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.MSearchAccessor

com.massa.mrules.accessor.MCountAccessor

All Implemented Interfaces:

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

public class MCountAccessor
extends MSearchAccessor

Allows to search a Collection for Objects validating a specific condition and to count them.
If nothing is found, returns 0.

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	COUNT_ID

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

SEARCH_ID

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

internalExpectedGenericType, internalExpectedType, source

Constructor Summary

Constructors

Constructor and Description
MCountAccessor()
MCountAccessor(IReadAccessor source, ICondition condition)

Method Summary

Modifier and Type	Method and Description
protected void	check()
MCountAccessor	clone() Clones the Addon.
<G,C extends Collection<G>> void	compileCollection(ICompilationContext ctxt, Class<C> expectedType, Class<G> expectedGenericType) Unsupported.
void	compileValue(ICompilationContext ctxt, Class<?> expectedType) Implementation to handle case when expected result is a single value.
CostInfo	getEstimatedReadCost(ICompilationContext ctxt) Returns source's cost + 1.
String	getImplementationId() Unique addon implementation ID.
Class<?>	getType(IContext ctxt) Returns requested type if any, otherwise the source's type if any.
Object	handleValue(IExecutionContext ctxt, Object value) If value is a collection an collections should be parsed, calls AbstractReadSourceAccessor.specificHandleValue(IExecutionContext, Object) for all elements in collection.

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

check, commonCompile, equals, getCondition, hashCode, isCacheUsed, parseCollections, setCondition, specificHandleValue, toString

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

getGenericCollectionType, getInternalCacheIdentifier, getSource, internalGet, isConstantValue, isInternalCacheIdentifierNeeded, isShouldIterate, resetCachedData, setInternalCacheIdentifier, setSource, wasRegistered

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

castToExpected, compileRead, compileRead, compileRead, compileRead, get, getGenericTypes, 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

COUNT_ID

public static final String COUNT_ID

See Also:

Constant Field Values

Constructor Detail

MCountAccessor

public MCountAccessor()

MCountAccessor

public MCountAccessor(IReadAccessor source,
                      ICondition condition)

Method Detail

check

protected void check()
              throws MRuleValidationException

Overrides:

check in class MSearchAccessor

Throws:

MRuleValidationException

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.

Overrides:

compileValue in class MSearchAccessor

Throws:

MRuleValidationException

compileCollection

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

Unsupported.

Overrides:

compileCollection in class MSearchAccessor

Throws:

MRuleValidationException

handleValue

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

Description copied from class: AbstractReadSourceAccessor

If value is a collection an collections should be parsed, calls AbstractReadSourceAccessor.specificHandleValue(IExecutionContext, Object) for all elements in collection. Otherwise calls it only once for the value.
Casts to correspond to expected result are handled here if necessary.

Specified by:

handleValue in interface IAccessorValueHandler

Overrides:

handleValue in class AbstractReadSourceAccessor

Throws:

MAccessorException

getEstimatedReadCost

public CostInfo getEstimatedReadCost(ICompilationContext ctxt)
                              throws MRuleValidationException

Description copied from class: AbstractReadSourceAccessor

Returns source's cost + 1.

Specified by:

getEstimatedReadCost in interface IReadAccessor

Overrides:

getEstimatedReadCost in class MSearchAccessor

Parameters:

ctxt - Compilation context.

Throws:

MRuleValidationException - if validation problem detected.

getType

public Class<?> getType(IContext ctxt)
                 throws MAccessorException

Description copied from class: AbstractReadSourceAccessor

Returns requested type if any, otherwise the source's type if any.

Specified by:

getType in interface IAccessor

Overrides:

getType in class AbstractReadSourceAccessor

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.

Specified by:

getImplementationId in interface IAddon

Overrides:

getImplementationId in class MSearchAccessor

clone

public MCountAccessor clone()

Description copied from interface: IAddon

Clones the Addon.
The general contract is that the clone of a compiled Addon is still compiled.

Specified by:

clone in interface IAccessor

Specified by:

clone in interface IReadAccessor

Specified by:

clone in interface IAddon

Specified by:

clone in interface IMRulesObject

Overrides:

clone in class MSearchAccessor