Bug 86602 AddDelegateMethodsActions
With the next integration build isInterface returns true for annotations. Some of the isInterface || && isAnnotation checks can be simplified now.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/AddUnimplementedConstructorsAction.java
public AddUnimplementedConstructorsAction(CompilationUnitEditor editor) {
		this(editor.getEditorSite());
		fEditor= editor;
		setEnabled(checkEnabledEditor());
	}
	/**
	 * Creates a new <code>AddUnimplementedConstructorsAction</code>. The action
	 * requires that the selection provided by the site's selection provider is of type
	 * <code>
	 * org.eclipse.jface.viewers.IStructuredSelection</code>.
	 * 
	 * @param site the site providing context information for this action
	 */
	public AddUnimplementedConstructorsAction(IWorkbenchSite site) {
		super(site);
		setText(ActionMessages.getString("AddUnimplementedConstructorsAction.label")); 
		setDescription(ActionMessages.getString("AddUnimplementedConstructorsAction.description")); 
		setToolTipText(ActionMessages.getString("AddUnimplementedConstructorsAction.tooltip")); 
		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IJavaHelpContextIds.ADD_UNIMPLEMENTED_CONSTRUCTORS_ACTION);
	}
	private boolean canEnable(IStructuredSelection selection) throws JavaModelException {
		if ((selection.size() == 1) && (selection.getFirstElement() instanceof IType)) {
			IType type= (IType) selection.getFirstElement();
			return type.getCompilationUnit() != null && !type.isAnnotation() && !type.isInterface() && !type.isEnum();
		}
		if ((selection.size() == 1) && (selection.getFirstElement() instanceof ICompilationUnit))
			return true;
		return false;
	}
	private boolean checkEnabledEditor() {