/* 
 * Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.sds.ui.internal.actions;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.csstudio.sds.model.AbstractWidgetModel;
import org.csstudio.sds.model.ContainerModel;
import org.csstudio.sds.ui.internal.commands.DeleteWidgetsCommand;
import org.csstudio.sds.ui.internal.editor.DisplayEditor;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.RequestConstants;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;
import org.eclipse.gef.internal.GEFMessages;
import org.eclipse.gef.requests.GroupRequest;
import org.eclipse.gef.ui.actions.DeleteAction;
import org.eclipse.ui.IWorkbenchPart;

/**
 * Action class that copies all currently selected widgets to the Clipboard.
 * 
 * @author Sven Wende
 * 
 */
public final class DeleteWidgetsAction extends DeleteAction {

	public DeleteWidgetsAction(IWorkbenchPart part) {
		super(part);
	}

	@SuppressWarnings({ "restriction" })
	@Override
	public Command createDeleteCommand(List objects) {
		if (objects.isEmpty() || !(objects.get(0) instanceof EditPart)) {
			return null;
		}

		GroupRequest deleteReq = new GroupRequest(RequestConstants.REQ_DELETE);
		deleteReq.setEditParts(objects);

		CompoundCommand compoundCmd = new CompoundCommand(GEFMessages.DeleteAction_ActionDeleteCommandName);

		Map<ContainerModel, List<AbstractWidgetModel>> deleteCandidates = new HashMap<ContainerModel, List<AbstractWidgetModel>>();

		for (int i = 0; i < objects.size(); i++) {
			EditPart ep = (EditPart) objects.get(i);

			AbstractWidgetModel w = (AbstractWidgetModel) ep.getModel();
			ContainerModel c = w.getParent();

			if (c != null) {
				if (!deleteCandidates.containsKey(c)) {
					deleteCandidates.put(c, new ArrayList<AbstractWidgetModel>());
				}
				deleteCandidates.get(c).add(w);
			}
		}

		DisplayEditor editor = (DisplayEditor) getWorkbenchPart();
		
		for (ContainerModel c : deleteCandidates.keySet()) {
			compoundCmd.add(new DeleteWidgetsCommand(editor.getGraphicalViewer(), c, deleteCandidates.get(c)));
		}

		return compoundCmd;
	}
}