content: /*
   * This library is part of OpenCms -
   * the Open Source Content Management System
   *
   * Copyright (c) Alkacon Software GmbH & Co. KG (https://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: https://www.alkacon.com
   *
   * For further information about OpenCms, please see the
   * project website: https://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.dialogs.permissions;
  
  import org.opencms.ui.A_CmsUI;
  import org.opencms.ui.shared.rpc.I_CmsPrincipalSelectRpc;
  
  import com.vaadin.server.AbstractExtension;
  import com.vaadin.ui.UI;
  
  /**
   * The principal select extension. Handles communication between the select dialog iframe and the server.<p>
   */
  public class CmsPrincipalSelectExtension extends AbstractExtension implements I_CmsPrincipalSelectRpc {
  
      /** The serial version id. */
      private static final long serialVersionUID = -38736017917448694L;
  
      /** The select widget. */
      private CmsPrincipalSelect m_select;
  
      /**
       * Constructor.<p>
       *
       * @param ui the select widget
       */
      private CmsPrincipalSelectExtension(UI ui) {
          extend(ui);
          registerRpc(this);
      }
  
      /**
       * Returns the principal select extension instance for the current UI.<p>
       *
       * @return the instance
       */
      protected static CmsPrincipalSelectExtension getInstance() {
  
          A_CmsUI ui = A_CmsUI.get();
          CmsPrincipalSelectExtension instance = (CmsPrincipalSelectExtension)ui.getAttribute(
              CmsPrincipalSelectExtension.class.getName());
          if (instance == null) {
              instance = new CmsPrincipalSelectExtension(ui);
              ui.setAttribute(CmsPrincipalSelectExtension.class.getName(), instance);
          }
          return instance;
      }
  
      /**
       * Sets the current select widget.<p>
       * This needs to be called, when the select window is opened.<p>
       *
       * @param select the select widget
       */
      public void setCurrentSelect(CmsPrincipalSelect select) {
  
          m_select = select;
      }
  
      /**
       * @see org.opencms.ui.shared.rpc.I_CmsPrincipalSelectRpc#setPrincipal(int, java.lang.String)
       */
      public void setPrincipal(int type, String principalName) {
  
          if (m_select != null) {
              m_select.setPrincipal(type, principalName);
              m_select.closeWindow();
              m_select = null;
          }
      }
  }
  