Question

I’m write a simple eclipse plugin, but have a problem: When user right-click on a node(maybe a project, a file, a java compilation unit, or others), I want to get the project it belongs.

The sample code is:

public class MyAction implements IObjectActionDelegate {
    private IProject project;
    public void selectionChanged(IAction action, ISelection selection) {
         this.project = getSelectedProject(selection);
    }

    public static IProject getSelectedProject(Object obj) throws Exception {
        if (obj == null) {
            return null;
        }
        if (obj instanceof IResource) {
            return ((IResource) obj).getProject();
        } else if (obj instanceof IStructuredSelection) {
            return getSelectedProject(((IStructuredSelection) obj).getFirstElement());
        }
        return null;
    }
}

It works at most of time, but sometimes, for example, I right-clicked on a java file, the selection will be a ICompilationUnit. Although I can add one more if in the getSelectedProject, but I don’t think it’s a good idea.

Is there a way to get the project of selected objects nomatter what have been selected? I don’t want to add them one by one.

Answer 1

ICompilationUnit extends IAdaptable (see http://publib.boulder.ibm.com/infocenter/rsmhelp/v7r0m0/index.jsp?topic=/org.eclipse.jdt.doc.isv/reference/api/org/eclipse/jdt/core/ICompilationUnit.html)

You can try and use the IAdaptable interface like that:

if (obj instanceof IAdaptable) {
    IResource res = (IResource)(((IAdaptable)obj).getAdapter(IResource.class));
    if (res != null) {
        return res.getProject();
    }
}