gt:                     String response = result.isEmpty()
context: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (http://www.alkacon.com)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * Lesser General Public License for more details.
   *
   * For further information about Alkacon Software, please see the
   * company website: http://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: http://www.opencms.org
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  package org.opencms.ui.sitemap;
  
  import org.opencms.file.CmsObject;
  import org.opencms.file.CmsProject;
  import org.opencms.file.CmsResource;
  import org.opencms.file.CmsResourceFilter;
  import org.opencms.gwt.shared.CmsGwtConstants;
  import org.opencms.main.CmsException;
  import org.opencms.main.CmsLog;
  import org.opencms.ui.A_CmsUI;
  import org.opencms.ui.CmsVaadinUtils;
  import org.opencms.ui.I_CmsDialogContext;
  import org.opencms.ui.Messages;
  import org.opencms.ui.apps.CmsSitemapEditorConfiguration;
  import org.opencms.ui.components.CmsBasicDialog;
  import org.opencms.ui.components.CmsBasicDialog.DialogWidth;
  import org.opencms.ui.components.CmsErrorDialog;
  import org.opencms.ui.components.CmsExternalLayout;
  import org.opencms.ui.shared.rpc.I_CmsEmbeddedDialogClientRPC;
  import org.opencms.ui.shared.rpc.I_CmsSitemapClientRpc;
  import org.opencms.ui.shared.rpc.I_CmsSitemapServerRpc;
  import org.opencms.util.CmsStringUtil;
  import org.opencms.util.CmsUUID;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  
  import org.apache.commons.logging.Log;
  
  import com.vaadin.server.AbstractExtension;
  import com.vaadin.ui.Component;
  import com.vaadin.ui.UI;
  import com.vaadin.v7.ui.VerticalLayout;
  import com.vaadin.ui.Window;
  import com.vaadin.ui.Window.CloseEvent;
  import com.vaadin.ui.Window.CloseListener;
  
  /**
   * Extension used for the Vaadin dialogs in the sitemap editor.<p>
   */
  public class CmsSitemapExtension extends AbstractExtension implements I_CmsSitemapServerRpc {
  
      /**
       * Dialog context for Vaadin dialogs in the sitemap editor.<p>
       */
      abstract class DialogContext implements I_CmsDialogContext {
  
          /** The context type. */
          private ContextType m_contextType;
  
          /** The list of resources. */
          private List<CmsResource> m_resources;
  
          /** The window used to display the dialog. */
          private Window m_window;
  
          /**
           * Constructor.<p>
           *
           * @param contextType the context type
           * @param resources the resources
           */
          public DialogContext(ContextType contextType, List<CmsResource> resources) {
              m_contextType = contextType;
              m_resources = resources != null ? resources : Collections.<CmsResource> emptyList();
          }
  
          /**
           * Closes the dialog window.<p>
           */
          public void closeWindow() {
  
              if (m_window != null) {
                  m_window.close();
                  m_window = null;
              }
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#error(java.lang.Throwable)
           */
          @SuppressWarnings("synthetic-access")
          public void error(Throwable error) {
  
              closeWindow();
              LOG.error(error.getLocalizedMessage(), error);
              CmsErrorDialog.showErrorDialog(error, new Runnable() {
  
                  public void run() {
                      // empty
                  }
              });
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#finish(org.opencms.file.CmsProject, java.lang.String)
           */
          public void finish(CmsProject project, String siteRoot) {
  
              throw new RuntimeException("NOT INPLEMENTED");
  
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#focus(org.opencms.util.CmsUUID)
           */
          public void focus(CmsUUID structureId) {
  
              // does not apply
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#getAllStructureIdsInView()
           */
          public List<CmsUUID> getAllStructureIdsInView() {
  
              return Collections.emptyList();
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#getAppId()
           */
          public String getAppId() {
  
              return CmsSitemapEditorConfiguration.APP_ID;
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#getCms()
           */
          public CmsObject getCms() {
  
              return A_CmsUI.getCmsObject();
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#getContextType()
           */
          public ContextType getContextType() {
  
              return m_contextType;
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#getResources()
           */
          public List<CmsResource> getResources() {
  
              return m_resources;
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#navigateTo(java.lang.String)
           */
          public void navigateTo(String appId) {
  
              throw new RuntimeException("NOT IMPLEMENTED");
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#onViewChange()
           */
          public void onViewChange() {
  
              throw new RuntimeException("NOT IMPLEMENTED");
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#reload()
           */
          public void reload() {
  
              throw new RuntimeException("NOT IMPLEMENTED");
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#setWindow(com.vaadin.ui.Window)
           */
          public void setWindow(Window window) {
  
              m_window = window;
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#start(java.lang.String, com.vaadin.ui.Component)
           */
          public void start(String title, Component dialog) {
  
              start(title, dialog, DialogWidth.narrow);
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#start(java.lang.String, com.vaadin.ui.Component, org.opencms.ui.components.CmsBasicDialog.DialogWidth)
           */
          public void start(String title, Component dialog, DialogWidth width) {
  
              if (dialog != null) {
                  m_window = CmsBasicDialog.prepareWindow(width);
                  m_window.setCaption(title);
                  m_window.setContent(dialog);
                  UI.getCurrent().addWindow(m_window);
                  m_window.addCloseListener(new CloseListener() {
  
                      private static final long serialVersionUID = 1L;
  
                      public void windowClose(CloseEvent e) {
  
                          handleWindowClose();
                      }
                  });
                  if (dialog instanceof CmsBasicDialog) {
                      ((CmsBasicDialog)dialog).initActionHandler(m_window);
                  }
              }
          }
  
          /**
           * @see org.opencms.ui.I_CmsDialogContext#updateUserInfo()
           */
          public void updateUserInfo() {
  
              // not supported
          }
  
          /**
           * Returns the client RPC.<p>
           *
           * @return the client RPC
           */
          @SuppressWarnings("synthetic-access")
          protected I_CmsEmbeddedDialogClientRPC getClientRPC() {
  
              return getRpcProxy(I_CmsEmbeddedDialogClientRPC.class);
          }
  
          /**
           * Handles the window close event.<p>
           */
          void handleWindowClose() {
              // empty
          }
  
      }
  
      /** Log instance for this class. */
      private static final Log LOG = CmsLog.getLog(CmsSitemapExtension.class);
  
      /** Serial version id. */
      private static final long serialVersionUID = 1L;
  
      /** The container for the locale comparison view. */
      private VerticalLayout m_localeCompareContainer;
  
      /** The currently active sitemap tree controller. */
      private CmsSitemapTreeController m_sitemapTreeController;
  
      /** The UI instance. */
      private CmsSitemapUI m_ui;
  
      /**
       * Creates a new instance.<p>
       *
       * @param ui the component to attach to
       */
      public CmsSitemapExtension(CmsSitemapUI ui) {
          extend(ui);
          m_ui = ui;
          registerRpc(this, I_CmsSitemapServerRpc.class);
      }
  
      /**
       * @see org.opencms.ui.shared.rpc.I_CmsSitemapServerRpc#handleChangedProperties(java.lang.String)
       */
      public void handleChangedProperties(String id) {
  
          if (m_sitemapTreeController != null) {
              m_sitemapTreeController.updateNodeForId(new CmsUUID(id));
          }
      }
  
      /**
       * @see org.opencms.ui.shared.rpc.I_CmsSitemapServerRpc#openPageCopyDialog(java.lang.String, java.lang.String)
       */
      public void openPageCopyDialog(final String callId, final String structureId) {
  
          CmsObject cms = A_CmsUI.getCmsObject();
          try {
              CmsResource resource = cms.readResource(new CmsUUID(structureId), CmsResourceFilter.IGNORE_EXPIRATION);
              DialogContext context = new DialogContext(null, Arrays.asList(resource)) {
  
                  @SuppressWarnings("synthetic-access")
                  public void finish(java.util.Collection<CmsUUID> result) {
  
                      closeWindow();
  