/*******************************************************************************
 * Copyright (c) 2001, 2009 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
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.xml.ui.internal.actions;

import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.wst.xml.ui.internal.XMLUIPlugin;
import org.eclipse.wst.xml.ui.internal.dialogs.EditAttributeDialog;
import org.eclipse.wst.xml.ui.internal.editor.XMLEditorPluginImageHelper;
import org.eclipse.wst.xml.ui.internal.editor.XMLEditorPluginImages;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class EditAttributeAction extends NodeAction {
	protected static ImageDescriptor imageDescriptor;

	public static ImageDescriptor createImageDescriptor() {
		if (imageDescriptor == null) {
			imageDescriptor = XMLEditorPluginImageHelper.getInstance().getImageDescriptor(XMLEditorPluginImages.IMG_OBJ_ATTRIBUTE);
		}
		return imageDescriptor;
	}

	protected Attr attr;
	protected AbstractNodeActionManager manager;
	protected Element ownerElement;
	protected String title;

	public EditAttributeAction(AbstractNodeActionManager manager, Element ownerElement, Attr attr, String actionLabel, String title) {
		this.manager = manager;
		this.ownerElement = ownerElement;
		this.attr = attr;
		this.title = title;
		setText(actionLabel);
		// assume if attr is null then this is an 'Add' that requires action
		// an icons... otherwise this is an edit
		if (attr == null) {
			setImageDescriptor(createImageDescriptor());
		}
	}

	public String getUndoDescription() {
		return title;
	}

	public void run() {
		Shell shell = XMLUIPlugin.getInstance().getWorkbench().getActiveWorkbenchWindow().getShell();
		if (validateEdit(manager.getModel(), shell)) {
			manager.beginNodeAction(this);
			EditAttributeDialog dialog = new EditAttributeDialog(shell, ownerElement, attr);
			dialog.create();
			dialog.getShell().setText(title);
			dialog.setBlockOnOpen(true);
			dialog.open();
	
			if (dialog.getReturnCode() == Window.OK) {
				if (attr != null) {
					ownerElement.removeAttributeNode(attr);
				}
				Document document = ownerElement.getOwnerDocument();
				Attr newAttribute = document.createAttribute(dialog.getAttributeName());
				newAttribute.setValue(dialog.getAttributeValue());
				ownerElement.setAttributeNode(newAttribute);
				manager.setViewerSelection(newAttribute);
			}
			manager.endNodeAction(this);
		}
	}
}