Examples of com.sun.faces.facelets.el.ContextualCompositeValueExpression

com.sun.faces.facelets.el.ContextualCompositeValueExpression
This specialized ValueExpression enables the evaluation of composite component expressions. Instances of this expression will be created when {@link com.sun.faces.facelets.tag.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 ValueExpressions 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 greeting="Hello!" /> comp1.xhtml --------------------------------- <composite:interface> <composite:attribute name="greeting" type="java.lang.String" required="true" /> </composite:interface> <composite:implementation> <ez:nesting> <h:outputText value="#{cc.attrs.greetings}" /> </ez:nesting> </composite:implementation> nesting.xhtml --------------------------------- <composite:interface /> <composite:implementation> <composite:insertChildren> </composite:implementation> 
```
In the above example, there will be two composite components available to the runtime: ez:comp1 and ez:nesting.

When <h:outputText value="#{cc.attrs.greeting}" />, prior to attempting to evaluate the expression, the {@link Location} object will be used tofind the composite component that 'owns' the template in which the expression was defined in by comparing the path of the Location with the name and library of the {@link javax.faces.application.Resource} instance associatedwith each composite component. If a matching composite component is found, it will be made available to the EL by calling {@link CompositeComponentStackManager#push(javax.faces.component.UIComponent)}.

  public UIComponent getValueParentComponent(final ValueExpression ve) 
  {
        if (ve instanceof ContextualCompositeValueExpression)
        {
            FacesContext ctx = FacesContext.getCurrentInstance();
            ContextualCompositeValueExpression ccve = (ContextualCompositeValueExpression)ve;
            CompositeComponentStackManager manager = CompositeComponentStackManager.getManager(ctx);
            UIComponent cc = manager.findCompositeComponentUsingLocation(ctx, ccve.getLocation());
            // set Parent
            return cc;
        }
        return null;
  }

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                    String message =
                          MessageUtils.getExceptionMessageString(ARGUMENTS_NOT_LEGAL_CC_ATTRS_EXPR);
                    throw new TagAttributeException(this, message);
                }
                return new TagValueExpression(this,
                                              new ContextualCompositeValueExpression(getLocation(),
                                                                                delegate));
            } else {
                return new TagValueExpression(this, delegate);
            }
        } catch (Exception e) {

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                ve = ((TagValueExpression)ve).getWrapped();
            // find parent
            if (ve instanceof ContextualCompositeValueExpression)
            {
                FacesContext ctx = FacesContext.getCurrentInstance();
                ContextualCompositeValueExpression ccve = (ContextualCompositeValueExpression)ve;
                CompositeComponentStackManager manager = CompositeComponentStackManager.getManager(ctx);
                UIComponent cc = manager.findCompositeComponentUsingLocation(ctx, ccve.getLocation());
                // set Parent
                parent = cc;
            }
            else
            {   // find parent

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                    String message =
                          MessageUtils.getExceptionMessageString(ARGUMENTS_NOT_LEGAL_CC_ATTRS_EXPR);
                    throw new TagAttributeException(this, message);
                }
                return new TagValueExpression(this,
                                              new ContextualCompositeValueExpression(getLocation(),
                                                                                delegate));
            } else {
                return new TagValueExpression(this, delegate);
            }
        } catch (Exception e) {

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                    String message =
                          MessageUtils.getExceptionMessageString(ARGUMENTS_NOT_LEGAL_CC_ATTRS_EXPR);
                    throw new TagAttributeException(this, message);
                }
                return new TagValueExpression(this,
                                              new ContextualCompositeValueExpression(getLocation(),
                                                                                delegate));
            } else {
                return new TagValueExpression(this, delegate);
            }
        } catch (Exception e) {

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                    String message =
                          MessageUtils.getExceptionMessageString(ARGUMENTS_NOT_LEGAL_CC_ATTRS_EXPR);
                    throw new TagAttributeException(this, message);
                }
                return new TagValueExpression(this,
                                              new ContextualCompositeValueExpression(getLocation(),
                                                                                delegate));
            } else {
                return new TagValueExpression(this, delegate);
            }
        } catch (Exception e) {

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                    String message =
                          MessageUtils.getExceptionMessageString(ARGUMENTS_NOT_LEGAL_CC_ATTRS_EXPR);
                    throw new TagAttributeException(this, message);
                }
                return new TagValueExpression(this,
                                              new ContextualCompositeValueExpression(getLocation(),
                                                                                delegate));
            } else {
                return new TagValueExpression(this, delegate);
            }
        } catch (Exception e) {

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                    String message =
                          MessageUtils.getExceptionMessageString(ARGUMENTS_NOT_LEGAL_CC_ATTRS_EXPR);
                    throw new TagAttributeException(this, message);
                }
                return new TagValueExpression(this,
                                              new ContextualCompositeValueExpression(getLocation(),
                                                                                delegate));
            } else {
                return new TagValueExpression(this, delegate);
            }
        } catch (Exception e) {

View Full Code Here

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Related Classes of com.sun.faces.facelets.el.ContextualCompositeValueExpression

com.sun.faces.component.CompositeComponentStackManager

com.sun.faces.facelets.tag.TagAttributeImpl

org.apache.empire.jsf2.app.impl.MojarraImplementation

org.apache.empire.jsf2.utils.TagEncodingHelper

javax.faces.component.UIComponent

javax.faces.context.FacesContext

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