/*
    * Copyright (C) 2007-2012 Argeo GmbH
    *
    * Licensed under the Apache License, Version 2.0 (the "License");
    * you may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *         http://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.argeo.slc.client.ui.commands;
  
  import java.util.Iterator;
  
  import org.argeo.slc.client.ui.ClientUiPlugin;
  import org.argeo.slc.client.ui.model.ResultParent;
  import org.argeo.slc.client.ui.views.JcrResultTreeView;
  import org.eclipse.core.commands.AbstractHandler;
  import org.eclipse.core.commands.ExecutionEvent;
  import org.eclipse.core.commands.ExecutionException;
  import org.eclipse.jface.resource.ImageDescriptor;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.handlers.HandlerUtil;
  
  /**
   * Force refresh the ResultTreeView. This command is only intended to be called
   * by either the toolbar menu of the view or by the popup menu. Refresh due to
   * data changes must be triggered by Observers
   */
  public class RefreshJcrResultTreeView extends AbstractHandler {
  	public final static String ID = ClientUiPlugin.ID
  			+ ".refreshJcrResultTreeView";
  	public final static String PARAM_REFRESH_TYPE = ClientUiPlugin.ID
  			+ ".param.refreshType";
  	public final static String PARAM_REFRESH_TYPE_FULL = "fullRefresh";
  	public final static ImageDescriptor DEFAULT_IMG_DESCRIPTOR = ClientUiPlugin
  	.getImageDescriptor("icons/refresh.png");
  	public final static String DEFAULT_LABEL = "Refresh selected";
  
  	public Object execute(final ExecutionEvent event) throws ExecutionException {
  		String refreshType = event.getParameter(PARAM_REFRESH_TYPE);
  		JcrResultTreeView view = (JcrResultTreeView) HandlerUtil
  				.getActiveWorkbenchWindow(event).getActivePage()
  				.getActivePart();
  
  		// force full refresh without preserving selection from the tool bar
  		if (PARAM_REFRESH_TYPE_FULL.equals(refreshType))
  			view.refresh(null);
  		else {
  			IStructuredSelection selection = (IStructuredSelection) HandlerUtil
  					.getActiveWorkbenchWindow(event).getActivePage()
  					.getSelection();
  			@SuppressWarnings("rawtypes")
  			Iterator it = selection.iterator();
  			while (it.hasNext()) {
  				Object obj = it.next();
  				if (obj instanceof ResultParent) {
  					view.refresh((ResultParent) obj);
  				}
  			}
  		}
  		return null;
  	}
  }