com.sun.faces.facelets.el

Class ContextualCompositeMethodExpression

java.lang.Object

javax.el.Expression

javax.el.MethodExpression

com.sun.faces.facelets.el.ContextualCompositeMethodExpression

All Implemented Interfaces:

Serializable

public class ContextualCompositeMethodExpression
extends javax.el.MethodExpression

This specialized MethodExpression enables the evaluation of composite component expressions. Instances of this expression will be created when TagAttributeImpl.getValueExpression(javax.faces.view.facelets.FaceletContext, Class) is invoked and the expression represents a composite component expression (i.e. #{cc.[properties]}).

It's important to note that these MethodExpressions are context sensitive in that they leverage the location in which they were referenced in order to push the proper composite component to the evaluation context prior to evaluating the expression itself.

Here's an example:

 Using Page test.xhtml
 ---------------------------------
    <ez:comp1 do="#{bean.action}" />


 comp1.xhtml
 ---------------------------------
 <composite:interface>
    <composite:attribute name="do" method-signature="String f()" required="true" />
 </composite:interface>
 <composite:implementation>
    <ez:nesting>
       <h:commandButton value="Click Me!" action="#{cc.attrs.do} />
    </ez:nesting>
 </composite:implementation>

 nesting.xhtml
 ---------------------------------
 <composite:interface />
 <composite:implementation>
    <composite:insertChildren>
 </composite:implementation>
 

When commandButton is clicked, the ContextualCompositeMethodExpression first is looked up by TagAttributeImpl.AttributeLookupMethodExpression which results an instance of ContextualCompositeMethodExpression. When this ContextualCompositeMethodExpression is invoked, the Location object necessary to find the proper composite component will be derived from source ValueExpression provided at construction time. Using the derived Location, we can find the composite component that matches 'owns' the template in which the expression was defined in by comparing the path of the Location with the name and library of the Resource instance associated with each composite component. If a matching composite component is found, it will be made available to the EL by calling CompositeComponentStackManager.push(javax.faces.component.UIComponent).

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ContextualCompositeMethodExpression(Location location, javax.el.MethodExpression delegate)
ContextualCompositeMethodExpression(javax.el.ValueExpression source, javax.el.MethodExpression delegate)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
String	getExpressionString()
javax.el.MethodInfo	getMethodInfo(javax.el.ELContext elContext)
int	hashCode()
Object	invoke(javax.el.ELContext elContext, Object[] objects)
boolean	isLiteralText()

Methods inherited from class javax.el.MethodExpression

isParametersProvided, isParmetersProvided

Methods inherited from class java.lang.Object

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

Constructor Detail

ContextualCompositeMethodExpression

public ContextualCompositeMethodExpression(javax.el.ValueExpression source,
                                           javax.el.MethodExpression delegate)

ContextualCompositeMethodExpression

public ContextualCompositeMethodExpression(Location location,
                                           javax.el.MethodExpression delegate)

Method Detail

getMethodInfo

public javax.el.MethodInfo getMethodInfo(javax.el.ELContext elContext)

Specified by:

getMethodInfo in class javax.el.MethodExpression

invoke

public Object invoke(javax.el.ELContext elContext,
                     Object[] objects)

Specified by:

invoke in class javax.el.MethodExpression

getExpressionString

public String getExpressionString()

Specified by:

getExpressionString in class javax.el.Expression

equals

public boolean equals(Object o)

Specified by:

equals in class javax.el.Expression

hashCode

public int hashCode()

Specified by:

hashCode in class javax.el.Expression

isLiteralText

public boolean isLiteralText()

Specified by:

isLiteralText in class javax.el.Expression