How to add a command in right click menu of a function or class in Eclipse?

Question

This is kind of newbie question. All tutorials show a way to add a command to a iFile object class. Can you show me an example of a plugin.xml file that registers a command for a function or class?

What I want to achieve is to right-click on a class or a function name in Outline view or in the code itself and have my new command in the context menu.

Answer 1

The key is to use visibleWhen part properly. This is an example of a command showing in Project Explorer which is visible only when a Java method or class is selected:

  <menuContribution
        locationURI="popup:org.eclipse.ui.navigator.ProjectExplorer#PopupMenu">
     <command
           commandId="__your.command.id__"
           id="your.contribution.id"
           label="Some Label"
           style="push">
        <visibleWhen
              checkEnabled="false">
           <iterate
                 ifEmpty="false"
                 operator="and">
              <or>
                 <instanceof
                       value="org.eclipse.jdt.core.IType">
                 </instanceof>
                 <instanceof
                       value="org.eclipse.jdt.core.IMethod">
                 </instanceof>
              </or>
           </iterate>
        </visibleWhen>
     </command>
  </menuContribution>

Don't forget to set commandId to something real.

You can find more info about property and selection testing here.

Answer 2

Based on the examples here you need to change objectClass to IMethod for method or IType for class.

P.S:

In order to see what kind of object is represented you can use the Plugin SelectionSpy Menu. Select an object and click CtrlShift+F1.