/**
 * Copyright (c) 2003-2005 Craig Setera
 * All Rights Reserved.
 * Licensed under the Eclipse Public License - v 1.0
 * For more information see http://www.eclipse.org/legal/epl-v10.html
 */
package eclipseme.ui.internal.actions;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.jdt.core.IJavaProject;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

/**
 * Superclass of actions that operate on IJavaProject instances
 * or things that can be adapted to an IJavaProject.
 * <p />
 * Copyright (c) 2003-2005 Craig Setera<br>
 * All Rights Reserved.<br>
 * Licensed under the Eclipse Public License - v 1.0<p/>
 * <br>
 * $Revision: 1.3 $
 * <br>
 * $Date: 2006/02/16 23:55:43 $
 * <br>
 * @author Craig Setera
 */
public abstract class AbstractJavaProjectAction implements IObjectActionDelegate {
	protected IStructuredSelection selection;
	protected IWorkbenchPart workbenchPart;

	/**
	 * Construct a new instance
	 */
	public AbstractJavaProjectAction() {
		super();
	}

	/**
	 * @see org.eclipse.ui.IObjectActionDelegate#setActivePart(org.eclipse.jface.action.IAction, org.eclipse.ui.IWorkbenchPart)
	 */
	public void setActivePart(IAction action, IWorkbenchPart targetPart) {
		workbenchPart = targetPart;
	}

	/**
	 * @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction, org.eclipse.jface.viewers.ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection) {
		if (selection instanceof IStructuredSelection) {
			this.selection = (IStructuredSelection) selection;
		} else {
			this.selection = null;
		}
	}

	/**
	 * Return the java project for the selected object or
	 * <code>null</null> if it is not a valid selection.
	 * 
	 * @param selected
	 * @return
	 */
	protected IJavaProject getJavaProject(Object selected) {
		IJavaProject javaProject = null;
		
		if (selected != null) {
			if (selected instanceof IJavaProject) {
				javaProject = (IJavaProject) selected;
			} else if (selected instanceof IProject) {
				javaProject = JavaCore.create((IProject) selected);
			} else if (selected instanceof IAdaptable) {
				IAdaptable adaptable = (IAdaptable) selected;
				javaProject = (IJavaProject) adaptable.getAdapter(IJavaProject.class);
				
				if (javaProject == null) {
					IProject project = (IProject) adaptable.getAdapter(IProject.class);
					javaProject = JavaCore.create(project);
				}
			}
		}
		
		return javaProject;	
	}

	/**
	 * Get the shell to use for opening the dialog.
	 * 
	 * @return
	 */
	protected Shell getShell() {
		Shell shell = null;
		
		if (workbenchPart != null) {
			shell = workbenchPart.getSite().getShell();
		}
		
		return shell;
	}
}