xenadmin/XenAdmin/Commands/DisconnectHostCommand.cs

/* Copyright (c) Citrix Systems, Inc. 
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using System;
using System.Collections.Generic;
using System.Text;
using XenAPI;
using XenAdmin.Network;
using XenAdmin.Actions;
using System.Windows.Forms;
using XenAdmin.Dialogs;
using System.Threading;
using XenAdmin.Core;
using System.Collections.ObjectModel;


namespace XenAdmin.Commands
{
    internal class DisconnectHostCommand : Command
    {
        /// <summary>
        /// Initializes a new instance of this Command. The parameter-less constructor is required if 
        /// this Command is to be attached to a ToolStrip menu item or button. It should not be used in any other scenario.
        /// </summary>
        public DisconnectHostCommand()
        {
        }

        public DisconnectHostCommand(IMainWindow mainWindow, IEnumerable<SelectedItem> selection)
            : base(mainWindow, selection)
        {
        }

        public DisconnectHostCommand(IMainWindow mainWindow, SelectedItem selection)
            : base(mainWindow, selection)
        {
        }

        protected override bool CanExecuteCore(SelectedItemCollection selection)
        {
            foreach (SelectedItem item in selection)
            {
                if (CanExecute(item))
                {
                    return true;
                }
            }

            return false;
        }

        private static bool CanExecute(SelectedItem selection)
        {
            IXenConnection connection = selection.Connection;
            Host host = selection.XenObject as Host;
            bool is_host = (host != null 
                );
            bool is_master = is_host && host.IsMaster();
            bool connected = connection != null && connection.IsConnected;

            return (connected && is_master) || (connection != null && connection.InProgress && !connection.IsConnected);
        }

        protected override void ExecuteCore(SelectedItemCollection selection)
        {
            foreach (SelectedItem item in selection)
            {
                if (CanExecute(item))
                {
                    new DisconnectCommand(MainWindowCommandInterface, item.Connection, true).Execute();
                }
            }
        }

        public override string MenuText
        {
            get
            {
                return Messages.MAINWINDOW_DISCONNECT;
            }
        }

        public override string ContextMenuText
        {
            get
            {
                return Messages.MAINWINDOW_DISCONNECT_CONTEXT_MENU;
            }
        }
    }
}