/*
    * 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.cms.ui.workbench.internal.jcr.commands;
  
  import javax.jcr.Node;
  import javax.jcr.RepositoryException;
  import javax.jcr.nodetype.NodeType;
  
  import org.argeo.cms.ui.jcr.model.SingleJcrNodeElem;
  import org.argeo.cms.ui.jcr.model.WorkspaceElem;
  import org.argeo.cms.ui.workbench.WorkbenchUiPlugin;
  import org.argeo.cms.ui.workbench.jcr.JcrBrowserView;
  import org.argeo.eclipse.ui.TreeParent;
  import org.argeo.eclipse.ui.dialogs.ErrorFeedback;
  import org.argeo.eclipse.ui.dialogs.SingleValue;
  import org.eclipse.core.commands.AbstractHandler;
  import org.eclipse.core.commands.ExecutionEvent;
  import org.eclipse.core.commands.ExecutionException;
  import org.eclipse.jface.viewers.ISelection;
  import org.eclipse.jface.viewers.IStructuredSelection;
  import org.eclipse.ui.handlers.HandlerUtil;
  
  /**
   * Adds a node of type nt:folder, only on {@link SingleJcrNodeElem} and
   * {@link WorkspaceElem} TreeObject types.
   * 
   * This handler assumes that a selection provider is available and picks only
   * first selected item. It is UI's job to enable the command only when the
   * selection contains one and only one element. Thus no parameter is passed
   * through the command.
   */
  public class AddFolderNode extends AbstractHandler {
  
  	public final static String ID = WorkbenchUiPlugin.PLUGIN_ID
  			+ ".addFolderNode";
  
  	public Object execute(ExecutionEvent event) throws ExecutionException {
  
  		ISelection selection = HandlerUtil.getActiveWorkbenchWindow(event)
  				.getActivePage().getSelection();
  
  		JcrBrowserView view = (JcrBrowserView) HandlerUtil
  				.getActiveWorkbenchWindow(event).getActivePage()
  				.findView(HandlerUtil.getActivePartId(event));
  
  		if (selection != null && !selection.isEmpty()
  				&& selection instanceof IStructuredSelection) {
  			Object obj = ((IStructuredSelection) selection).getFirstElement();
  			TreeParent treeParentNode = null;
  			Node jcrParentNode = null;
  
  			if (obj instanceof SingleJcrNodeElem) {
  				treeParentNode = (TreeParent) obj;
  				jcrParentNode = ((SingleJcrNodeElem) treeParentNode).getNode();
  			} else if (obj instanceof WorkspaceElem) {
  				treeParentNode = (TreeParent) obj;
  				jcrParentNode = ((WorkspaceElem) treeParentNode).getRootNode();
  			} else
  				return null;
  
  			String folderName = SingleValue.ask("Folder name",
  					"Enter folder name");
  			if (folderName != null) {
  				try {
  					jcrParentNode.addNode(folderName, NodeType.NT_FOLDER);
  					jcrParentNode.getSession().save();
  					view.nodeAdded(treeParentNode);
  				} catch (RepositoryException e) {
  					ErrorFeedback.show("Cannot create folder " + folderName
  							+ " under " + treeParentNode, e);
  				}
  			}
  		} else {
  			ErrorFeedback.show(WorkbenchUiPlugin
  					.getMessage("errorUnvalidNtFolderNodeType"));
  		}
  		return null;
  	}
  }