metadone.client.grasyla2.generic.GuardEngine Class Reference

Inheritance diagram for metadone.client.grasyla2.generic.GuardEngine:

Collaboration diagram for metadone.client.grasyla2.generic.GuardEngine:

List of all members.

Public Member Functions
	GuardEngine (GrasylaContext context, ConcreteObject expression, Engine parent) throws BadPreCondition
Protected Member Functions
boolean	isNativeAttribute (String name)
void	notifyChildChanged (Engine child, ChildComponent comp)
Package Functions
protected< C > Component <?extends C >	buildNewComponent (Class< C > clComp) throws BadPreCondition
protected< C > Component <?extends C >	buildNewTrueComponent (Class< C > clComp, boolean active) throws BadPreCondition
protected< C > Component <?extends C >	buildNewFalseComponent (Class< C > clComp) throws BadPreCondition
Static Package Attributes
static final Object	FALSE_INDICATOR = false
Static Private Attributes
static final String	ATTR_COND = "condition"

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Detailed Description

A guard (condition evaluation) for a if.

Attributes

• condition (native): Boolean

Contents

Evaluated as the given class.

Result

If the `condition` has been evaluated to true or such an attribute does not exist, the result is the concatenation of the values of the content components. Otherwise, an empty component is built with the FALSE_INDICATOR.

Author:

kma

See also:

IfEngine

GroupEngine

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Constructor & Destructor Documentation

metadone.client.grasyla2.generic.GuardEngine.GuardEngine	(	GrasylaContext	context,
		ConcreteObject	expression,
		Engine	parent
	)		throws BadPreCondition

Initializes this engine.

Parameters:

context	The context
expression	The expression
parent	The parent or null

Exceptions:

BadPreCondition

References metadone.client.grasyla2.GrasylaEngine.context, metadone.client.grasyla2.GrasylaEngine.expression, and metadone.client.grasyla2.GrasylaEngine.parent.

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Member Function Documentation

protected<C> Component<? extends C> metadone.client.grasyla2.generic.GuardEngine.buildNewComponent

(

Class< C >

clComp

)

throws BadPreCondition [package, virtual]

Builds a new component.

Parameters:

<C>	The type
clComp	The class

Returns:

The new component

Exceptions:

BadPreCondition

Reimplemented from metadone.client.grasyla2.generic.GroupEngine.

References metadone.client.grasyla2.generic.GuardEngine.ATTR_COND, metadone.client.grasyla2.GrasylaEngine.buildChild(), metadone.client.grasyla2.generic.GuardEngine.buildNewFalseComponent(), metadone.client.grasyla2.generic.GuardEngine.buildNewTrueComponent(), metadone.client.grasyla2.GrasylaEngine.getAttributes(), and metadone.client.grasyla2.GrasylaEngine.getContext().

protected<C> Component<? extends C> metadone.client.grasyla2.generic.GuardEngine.buildNewFalseComponent

(

Class< C >

clComp

)

throws BadPreCondition [package]

Builds a new false component.

Parameters:

<C>	The type
clComp	The class

Returns:

The component

Exceptions:

BadPreCondition

References metadone.client.grasyla2.generic.GuardEngine.FALSE_INDICATOR.

Referenced by metadone.client.grasyla2.generic.GuardEngine.buildNewComponent(), and metadone.client.grasyla2.generic.GuardEngine.notifyChildChanged().

protected<C> Component<? extends C> metadone.client.grasyla2.generic.GuardEngine.buildNewTrueComponent	(	Class< C >	clComp,
		boolean	active
	)		throws BadPreCondition [package]

Builds a new true component.

Parameters:

<C>	The type
clComp	The class
active	Whether to activate

Returns:

The component

Exceptions:

BadPreCondition

References metadone.client.grasyla2.GrasylaEngine.activate().

Referenced by metadone.client.grasyla2.generic.GuardEngine.buildNewComponent(), and metadone.client.grasyla2.generic.GuardEngine.notifyChildChanged().

boolean metadone.client.grasyla2.generic.GuardEngine.isNativeAttribute

(

String

name

)

[protected]

Indicates whether an attribute is handled when building the component.

In other words, a native attribute should not be handled by an attribute handler.

Parameters:

name	The name of the attribute

Returns:

true if name is a native attribute

Reimplemented from metadone.client.grasyla2.GrasylaEngine.

References metadone.client.grasyla2.generic.GuardEngine.ATTR_COND.

void metadone.client.grasyla2.generic.GuardEngine.notifyChildChanged	(	Engine	child,
		ChildComponent	comp
	)		[protected]

Reimplemented from metadone.client.grasyla2.generic.GroupEngine.

References metadone.client.grasyla2.generic.GuardEngine.ATTR_COND, metadone.client.grasyla2.generic.GuardEngine.buildNewFalseComponent(), metadone.client.grasyla2.generic.GuardEngine.buildNewTrueComponent(), metadone.client.grasyla2.GrasylaEngine.clearChildren(), metadone.client.grasyla2.GrasylaEngine.clearChildrenExpressions(), metadone.client.grasyla2.GrasylaEngine.ChildComponent.getAttribute(), metadone.client.grasyla2.GrasylaEngine.ChildComponent.getComponent(), metadone.client.grasyla2.GrasylaEngine.getComponent(), metadone.client.grasyla2.GrasylaEngine.getExpression(), metadone.client.grasyla2.GrasylaEngine.getState(), metadone.client.grasyla2.GrasylaEngine.isActive(), metadone.client.grasyla2.GrasylaEngine.logger, and metadone.client.grasyla2.GrasylaEngine.updateComponent().

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Member Data Documentation

final String metadone.client.grasyla2.generic.GuardEngine.ATTR_COND = "condition" [static, private]

Referenced by metadone.client.grasyla2.generic.GuardEngine.buildNewComponent(), metadone.client.grasyla2.generic.GuardEngine.isNativeAttribute(), and metadone.client.grasyla2.generic.GuardEngine.notifyChildChanged().

final Object metadone.client.grasyla2.generic.GuardEngine.FALSE_INDICATOR = false [static, package]

Indicator that the condition has been evaluated to false.

Referenced by metadone.client.grasyla2.generic.GuardEngine.buildNewFalseComponent(), metadone.client.grasyla2.generic.IfEngine.evaluateSimple(), and metadone.client.grasyla2.generic.IfEngine.rebuildSingle().

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The documentation for this class was generated from the following file:

• metadone_bundle_client/src/metadone/client/grasyla2/generic/GuardEngine.java