CLONE -Add getParent() method to IComponent
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Key: TAPESTRY-891
URL: http://issues.apache.org/jira/browse/TAPESTRY-891
Project: Tapestry
Type: Improvement
Components: Framework
Versions: 3.0.1
Reporter: Sergey Manukyan
Priority: Minor
Tapestry does not allow you to retrieve the parent of a component. If you have
a component C nested in a component P, there is no method to retrieve the
parent P from C. What is needed is a getParent() method.
There is no logical reason for not including a getParent method as methods
exist to retrieve the children of a component. The getParent method is
extremely useful if you wish to change the rendering behavior of a component
based on whether it is nested inside a particular component. The JSP taglib API
supports this with the TagSupport.findAncestorWithClass(Tag, Class) method.
Without the getParent method, it is difficult to convert some JSP tags to
Tapestry components.
Fortunately, this improvement is not difficult to implement. I have
successfully implemented this by adding a private variable _parent of type
IComponent to AbstractComponent and adding getParent/setParent methods to
get/set the variable: the getter should look like this:
return _parent != null ? _parent : getContainer();
Finally, add the following line to
BaseComponentTemplateLoader.process(OpenToken) method (line 268 under version
3.0.1)
component.setParent(_activeComponent);
(Note that Tapestry does allow you to retrieve the IComponent a particular
component is embedded in via the IComponent.getContainer() call. This call will
retrieve the component whose template C was defined in. This method does not
address the issue.)
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