/*******************************************************************************
 * Copyright (c) 2003, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 * IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jst.j2ee.internal.actions;


import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.swt.widgets.Event;
import org.eclipse.ui.IEditorDescriptor;
import org.eclipse.ui.IEditorRegistry;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.actions.SelectionListenerAction;
import org.eclipse.wst.common.navigator.views.INavigatorActionDelegate;
import org.eclipse.wst.common.navigator.views.INavigatorExtensionSite;

/**
 * Action for opening a J2EE resource from the J2EE navigator.
 */
public abstract class AbstractOpenAction extends SelectionListenerAction implements INavigatorActionDelegate {
	// //$NON-NLS-1$
	protected IEditorDescriptor currentDescriptor;
	protected Object srcObject;

	protected AbstractOpenAction(String text) {
		super(text);
	}

	protected static IEditorDescriptor findEditorDescriptor(String id) {
		IEditorRegistry registry = PlatformUI.getWorkbench().getEditorRegistry();
		return registry.findEditor(id);
	}

	protected void setAttributesFromDescriptor() {
		if (currentDescriptor == null)
			return;
		setText(currentDescriptor.getLabel());
		setToolTipText(currentDescriptor.getLabel());
		setImageDescriptor(currentDescriptor.getImageDescriptor());
	}

	/**
	 * The structured selection has changed in the workbench. Subclasses should override this method
	 * to react to the change. Returns true if the action should be enabled for this selection, and
	 * false otherwise.
	 * 
	 * When this method is overridden, the super method must always be invoked. If the super method
	 * returns false, this method must also return false.
	 * 
	 * @param sel
	 *            the new structured selection
	 */
	public boolean updateSelection(IStructuredSelection s) {
		srcObject = null;
		if (!super.updateSelection(s))
			return false;

		if (s.size() != 1)
			return false;

		return true;
	}

	// TODO Skeleton implementation of INavigatorActionDelegate
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.wst.common.navigator.internal.views.navigator.INavigatorActionDelegate#init(org.eclipse.wst.common.navigator.internal.views.navigator.INavigatorExtensionSite)
	 */
	public void init(INavigatorExtensionSite site) {

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IActionDelegate2#dispose()
	 */
	public void dispose() {
		// TODO Auto-generated method stub

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IActionDelegate2#init(org.eclipse.jface.action.IAction)
	 */
	public void init(IAction action) {

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IActionDelegate2#runWithEvent(org.eclipse.jface.action.IAction,
	 *      org.eclipse.swt.widgets.Event)
	 */
	public void runWithEvent(IAction action, Event event) {
		runWithEvent(event);

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IActionDelegate#run(org.eclipse.jface.action.IAction)
	 */
	public void run(IAction action) {
		// TODO Auto-generated method stub
		run();

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.IActionDelegate#selectionChanged(org.eclipse.jface.action.IAction,
	 *      org.eclipse.jface.viewers.ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection) {
		// TODO HACK!
		updateSelection((IStructuredSelection) selection);
	}

}