AddRubyNatureAction.java

package org.rubypeople.rdt.internal.ui.actions;

import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;
import org.rubypeople.rdt.core.IRubyElement;
import org.rubypeople.rdt.core.RubyCore;
import org.rubypeople.rdt.internal.ui.RubyPlugin;

public class AddRubyNatureAction implements IWorkbenchWindowActionDelegate {

	private Shell fCurrentShell;

	private ISelection fSelection;

	public void dispose() {
	}

	public void init(IWorkbenchWindow window) {
		fCurrentShell = window.getShell();
	}

	public void run(IAction action) {
		IResource resource = findSelectedResource();
		if (resource == null) {
			MessageDialog
			.openInformation(
					fCurrentShell.getShell(),
					"No project selected",
					"Please select a project or resource for the addition of a ruby nature to the enclosing project.");
			return;
		}
		try {
			RubyCore.addRubyNature(resource.getProject(), null);
		} catch (CoreException e) {
			MessageDialog.openInformation(fCurrentShell.getShell(),
					"Unable to add ruby nature", e.getMessage());
		}
	}

	private IResource findSelectedResource() {
		// the first shot is the selection
		if (fSelection instanceof IStructuredSelection) {
			IStructuredSelection selection = (IStructuredSelection) fSelection;
			Object first = selection.getFirstElement();
			if (first instanceof IResource) {
				return ((IResource) first);
			}
		}

		// the second is to check the active editor
		// this behaviour is similar to the RubyApplicationShortcut, which also
		// takes a selection in the navigator or the active editor to determine
		// which
		// ruby file to launch
		IWorkbenchPage page = RubyPlugin.getActivePage();
		if (page == null) {
			return null;
		}
		IEditorPart editor = page.getActiveEditor();
		if (editor == null) {
			return null;
		}
		IEditorInput input = editor.getEditorInput();
		if (input == null) {
			return null;
		}
		IRubyElement rubyElement = (IRubyElement) input
				.getAdapter(IRubyElement.class);
		if (rubyElement == null) {
			return null;
		}
		return rubyElement.getResource();
	}

	public void selectionChanged(IAction action, ISelection selection) {
		fSelection = selection;
	}

}