Software Developer

Category: Java

Modifying the “New Child” sub-menu items in EMF

I was just looking into a way to adjust the text of the items in the “New Child” (the same applies to “New Sibling” as well) sub-menu of the generated editor with EMF. By default the items just show the type name of the element to create. Depending on your meta-model it might be necessary to add some more information in order to be able to see which feature the new element gets added (or set) to.

The available items are depending on the current selected element. The collectNewChildDescriptors(Collection<Object>, Object) method is called on the item provider of this element. The actions for those menu items are created inside your ActionBarContributor class (see generateCreateChildActions(Collection<?>, ISelection)), which is located in the editor project. The text for this action is determined by CreateChildCommand.getText(), which in turn calls getCreateChildText(Object, Object, Object, Collection<?>) of the corresponding item provider. The default case is implemented in ItemProviderAdapter.

There seem to be two approaches, depending on what your goal is.

General approach: If you want to change the text independent from the element, meaning for all elements, you should change the _UI_CreateChild_text key in plugin.properties. By default this is {0}. This refers to the type name of the child. Also available are the feature text ({1}) and the type name of the owner ({2}).

Case-specific approach: If you just need to adjust it for one element, simply overwrite getCreateChildText(Object, Object, Object, Collection<?>) in the corresponding item provider and adjust it to your needs. Here is an example, that simply adds the features’ text in front of the default child text:

@Override
public String getCreateChildText(Object owner, Object feature,
        Object child, Collection<?> selection) {
    StringBuffer result = new StringBuffer();

    result.append(getFeatureText(feature));
    result.append(" ");
    result.append(super.getCreateChildText(owner, feature, child, selection));

    return result.toString();
}

Things discovered in Struts 2

In this post I write about some things I discovered during the development of a project where Struts 2 is used. I note them since I couldn’t find them in the documentation and they were discovered through digging through pieces of documentation, the code and the web.

In general, sometimes more detailed information can be found in the Javadoc of the frameworks classes, e.g. interceptors.

Skipping validation for a specific method in an action class

Continue reading

© 2021 Matthias Schoettle

Theme by Anders NorenUp ↑