//******************************************************************************************************//  MenuCommand.cs - Gbtc////  Copyright © 2012, Grid Protection Alliance.  All Rights Reserved.////  Licensed to the Grid Protection Alliance (GPA) under one or more contributor license agreements. See//  the NOTICE file distributed with this work for additional information regarding copyright ownership.//  The GPA licenses this file to you under the MIT License (MIT), 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.opensource.org/licenses/MIT////  Unless agreed to in writing, the subject software distributed under the License is distributed on an//  "AS-IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. Refer to the//  License for the specific language governing permissions and limitations.////  Code Modification History://  ----------------------------------------------------------------------------------------------------//  03/25/2011 - Mehulbhai P Thakkar//       Generated original version of source code.//  05/13/2011 - Mehulbhai P Thakkar//       Modified Execute() method to set main window's title property.//  12/20/2012 - Starlynn Danyelle Gilliam//       Modified Header.////****************************************************************************************************** using System;using System.Linq;using System.Reflection;using System.Windows.Input;using GSF.IO;using GSF.Security; namespace GSF.TimeSeries.UI.Commands{    /// <summary>    /// Exposes <see cref="ICommand"/> object to be used to handle menu item click event.    /// </summary>    public class MenuCommand : ICommand    {        #region [ Members ]         // Fields        private string m_roles;        private string m_userControlAssembly;        private string m_userControlPath;        private string m_description;         //Events         /// <summary>        /// Raises when value of <see cref="CanExecute"/> changes.        /// </summary>        public event EventHandler CanExecuteChanged;         #endregion         #region [ Constructors ]         /// <summary>        /// Creates a new instance of the <see cref="MenuCommand"/> class.        /// </summary>        public MenuCommand()        {            CommonFunctions.CurrentPrincipalRefreshed += (sender, args) => OnCanExecuteChanged();        }         #endregion         #region [ Properties ]         /// <summary>        /// Gets or sets comma seperated values of roles for which menuitem is visible.        /// </summary>        public string Roles        {            get            {                return m_roles;            }            set            {                m_roles = value;            }        }         /// <summary>        /// Gets or sets name of the assembly where user control belongs to.        /// </summary>        public string UserControlAssembly        {            get            {                return m_userControlAssembly;            }            set            {                m_userControlAssembly = value;            }        }         /// <summary>        /// Gets or sets name of the user control to be loaded.        /// </summary>        public string UserControlPath        {            get            {                return m_userControlPath;            }            set            {                m_userControlPath = value;            }        }         /// <summary>        /// Gets or sets the description of associated <see cref="MenuDataItem"/>.        /// </summary>        public string Description        {            get            {                return m_description;            }            set            {                m_description = value;            }        }         #endregion         #region [ Methods ]         /// <summary>        /// Evaluates if menu item should be visible to current user with access to <see cref="Roles"/>.        /// </summary>        /// <param name="parameter">        /// Data used by the <see cref="MenuCommand"/>. If the <see cref="MenuCommand"/> does not require        /// data to be passed, this object can be set to <c>null</c>.        /// </param>        /// <returns><c>true</c> if this <see cref="MenuCommand"/> can be executed; otherwise, <c>false</c>.</returns>        public bool CanExecute(object parameter)        {            SecurityPrincipal currentPrincipal = CommonFunctions.CurrentPrincipal;             return currentPrincipal.Identity.IsAuthenticated &&                (string.IsNullOrEmpty(Roles) || Roles == "*" || currentPrincipal.IsInRole(Roles));        }         /// <summary>        /// Handles <see cref="ICommand"/> action.         /// Loads user control as defined in the <see cref="UserControlPath"/> property from assembly name set in the         /// <see cref="UserControlAssembly"/> property.        /// </summary>        /// <param name="parameter">        /// Data used by the <see cref="MenuCommand"/>. If the <see cref="MenuCommand"/> does not require        /// data to be passed, this object can be set to <c>null</c>.        /// </param>        public void Execute(object parameter)        {            try            {                Assembly assembly = Assembly.LoadFrom(FilePath.GetAbsolutePath(m_userControlAssembly));                CommonFunctions.LoadUserControl(m_description, assembly.GetType(m_userControlPath));            }            catch (Exception ex)            {                throw new InvalidOperationException(string.Format("Failed to create user control {0}: {1}", m_userControlPath, ex.Message), ex);            }        }         /// <summary>        /// Raises the <see cref="CanExecuteChanged"/> event.        /// </summary>        protected virtual void OnCanExecuteChanged()        {            if (CanExecuteChanged != null)                CanExecuteChanged(this, EventArgs.Empty);        }         #endregion    }}