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AddinManager.cs

//
// AddinManager.cs
//
// Author:
//   Lluis Sanchez Gual
//
// Copyright (C) 2007 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.IO;
using System.Reflection;
using System.Collections;

using Mono.Addins.Localization;

namespace Mono.Addins
{
      public class AddinManager
      {
            static AddinSessionService sessionService;
            static AddinRegistry registry;
            
            static string startupDirectory;
            static bool initialized;
            static IAddinInstaller installer;

            public static event AddinErrorEventHandler AddinLoadError;
            public static event AddinEventHandler AddinLoaded;
            public static event AddinEventHandler AddinUnloaded;

            private AddinManager ()
            {
            }
            
            public static void Initialize ()
            {
                  Initialize (null);
            }
            
            public static void Initialize (string configDir)
            {
                  if (initialized)
                        return;
                  
                  Assembly asm = Assembly.GetEntryAssembly ();
                  if (asm == null) asm = Assembly.GetCallingAssembly ();
                  string asmFile = new Uri (asm.CodeBase).LocalPath;
                  
                  startupDirectory = Path.GetDirectoryName (asmFile);
                  
                  string customDir = Environment.GetEnvironmentVariable ("MONO_ADDINS_REGISTRY");
                  if (customDir != null && customDir.Length > 0)
                        configDir = customDir;

                  if (configDir == null || configDir.Length == 0)
                        registry = AddinRegistry.GetGlobalRegistry (startupDirectory);
                  else
                        registry = new AddinRegistry (configDir, startupDirectory);

                  if (registry.CreateHostAddinsFile (asmFile))
                        registry.Update (new ConsoleProgressStatus (false));
                  
                  initialized = true;
                  
                  SessionService.Initialize ();
            }
            
            public static void Shutdown ()
            {
                  SessionService.Shutdown ();
                  registry.Dispose ();
                  registry = null;
                  startupDirectory = null;
                  initialized = false;
            }
            
            public static void InitializeDefaultLocalizer (IAddinLocalizer localizer)
            {
                  CheckInitialized ();
                  SessionService.InitializeDefaultLocalizer (localizer);
            }
            
            internal static string StartupDirectory {
                  get { return startupDirectory; }
            }
            
            public static bool IsInitialized {
                  get { return initialized; }
            }
            
            public static IAddinInstaller DefaultInstaller {
                  get { return installer; }
                  set { installer = value; }
            }
            
            public static AddinLocalizer DefaultLocalizer {
                  get {
                        CheckInitialized ();
                        return SessionService.DefaultLocalizer;
                  }
            }
            
            public static AddinLocalizer CurrentLocalizer {
                  get {
                        CheckInitialized ();
                        RuntimeAddin addin = SessionService.GetAddinForAssembly (Assembly.GetCallingAssembly ());
                        if (addin != null)
                              return addin.Localizer;
                        else
                              return SessionService.DefaultLocalizer;
                  }
            }
            
            public static RuntimeAddin CurrentAddin {
                  get {
                        CheckInitialized ();
                        return SessionService.GetAddinForAssembly (Assembly.GetCallingAssembly ());
                  }
            }
            
            internal static AddinSessionService SessionService {
                  get {
                        if (sessionService == null)
                              sessionService = new AddinSessionService();
                        
                        return sessionService;
                  }
            }
      
            public static AddinRegistry Registry {
                  get {
                        CheckInitialized ();
                        return registry;
                  }
            }
            
            // This method checks if the specified add-ins are installed.
            // If some of the add-ins are not installed, it will use
            // the installer assigned to the DefaultAddinInstaller property
            // to install them. If the installation fails, or if DefaultAddinInstaller
            // is not set, an exception will be thrown.
            public static void CheckInstalled (string message, params string[] addinIds)
            {
                  ArrayList notInstalled = new ArrayList ();
                  foreach (string id in addinIds) {
                        Addin addin = Registry.GetAddin (id, false);
                        if (addin != null) {
                              // The add-in is already installed
                              // If the add-in is disabled, enable it now
                              if (!addin.Enabled)
                                    addin.Enabled = true;
                        } else {
                              notInstalled.Add (id);
                        }
                  }
                  if (notInstalled.Count == 0)
                        return;
                  if (installer == null)
                        throw new InvalidOperationException ("Add-in installer not set");
                  
                  // Install the add-ins
                  installer.InstallAddins (Registry, message, (string[]) notInstalled.ToArray (typeof(string)));
            }
      
            public static bool IsAddinLoaded (string id)
            {
                  CheckInitialized ();
                  return SessionService.IsAddinLoaded (id);
            }
            
            public static void LoadAddin (IProgressStatus statusMonitor, string id)
            {
                  CheckInitialized ();
                  SessionService.LoadAddin (statusMonitor, id, true);
            }
            
            public static ExtensionContext CreateExtensionContext ()
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.CreateChildContext ();
            }
            
            public static ExtensionNode GetExtensionNode (string path)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionNode (path);
            }
            
            public static ExtensionNodeList GetExtensionNodes (string path)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionNodes (path);
            }
            
            public static ExtensionNodeList GetExtensionNodes (string path, Type type)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionNodes (path, type);
            }
            
            public static object[] GetExtensionObjects (Type instanceType)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionObjects (instanceType);
            }
            
            public static object[] GetExtensionObjects (Type instanceType, bool reuseCachedInstance)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionObjects (instanceType, reuseCachedInstance);
            }
            
            public static object[] GetExtensionObjects (string path)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionObjects (path);
            }
            
            public static object[] GetExtensionObjects (string path, bool reuseCachedInstance)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionObjects (path, reuseCachedInstance);
            }
            
            public static object[] GetExtensionObjects (string path, Type arrayElementType)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionObjects (path, arrayElementType);
            }
            
            public static object[] GetExtensionObjects (string path, Type arrayElementType, bool reuseCachedInstance)
            {
                  CheckInitialized ();
                  return SessionService.DefaultContext.GetExtensionObjects (path, arrayElementType, reuseCachedInstance);
            }
            
            public static event ExtensionEventHandler ExtensionChanged {
                  add { CheckInitialized(); SessionService.DefaultContext.ExtensionChanged += value; }
                  remove { CheckInitialized(); SessionService.DefaultContext.ExtensionChanged -= value; }
            }
            
            public static void AddExtensionNodeHandler (string path, ExtensionNodeEventHandler handler)
            {
                  CheckInitialized ();
                  SessionService.DefaultContext.AddExtensionNodeHandler (path, handler);
            }
            
            public static void RemoveExtensionNodeHandler (string path, ExtensionNodeEventHandler handler)
            {
                  CheckInitialized ();
                  SessionService.DefaultContext.RemoveExtensionNodeHandler (path, handler);
            }
            
            static void CheckInitialized ()
            {
                  if (!initialized)
                        throw new InvalidOperationException ("Add-in manager not initialized.");
            }
            
            internal static void ReportError (string message, string addinId, Exception exception, bool fatal)
            {
                  if (AddinLoadError != null)
                        AddinLoadError (null, new AddinErrorEventArgs (message, addinId, exception));
                  else {
                        Console.WriteLine (message);
                        if (exception != null)
                              Console.WriteLine (exception);
                  }
            }
            
            internal static void ReportAddinLoad (string id)
            {
                  if (AddinLoaded != null) {
                        try {
                              AddinLoaded (null, new AddinEventArgs (id));
                        } catch {
                              // Ignore subscriber exceptions
                        }
                  }
            }
            
            internal static void ReportAddinUnload (string id)
            {
                  if (AddinUnloaded != null) {
                        try {
                              AddinUnloaded (null, new AddinEventArgs (id));
                        } catch {
                              // Ignore subscriber exceptions
                        }
                  }
            }
      }

}

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