mcs/class/System/System.ComponentModel/LicenseManager.cs

   1 //
   2 // System.ComponentModel.LicenseManager.cs
   3 //
   4 // Authors:
   5 //   Ivan Hamilton (ivan@chimerical.com.au)
   6 //   Martin Willemoes Hansen (mwh@sysrq.dk)
   7 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   8 //
   9 // (C) 2004 Ivan Hamilton
  10 // (C) 2003 Martin Willemoes Hansen
  11 // (C) 2003 Andreas Nahr
  12 //
  13
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 namespace System.ComponentModel
  36 {
  37         public sealed class LicenseManager
  38         {
  39                 static LicenseContext mycontext;
  40                 static object contextLockUser;
  41
  42                 static object lockObject = new object ();
  43
  44                 private LicenseManager ()
  45                 {
  46                 }
  47
  48                 public static LicenseContext CurrentContext {
  49                         get {
  50                                 lock (lockObject) {
  51                                         //Tests indicate a System.ComponentModel.Design.RuntimeLicenseContext should be returned.
  52                                         if  (mycontext==null)
  53                                                 mycontext = new Design.RuntimeLicenseContext();
  54                                         return mycontext;
  55                                 }
  56                         }
  57                         set {
  58                                 lock (lockObject) {
  59                                         if (contextLockUser==null) {
  60                                                 mycontext = value;
  61                                         } else {
  62                                                 throw new InvalidOperationException("The CurrentContext property of the LicenseManager is currently locked and cannot be changed.");
  63                                         }
  64                                 }
  65                         }
  66                 }
  67
  68                 public static LicenseUsageMode UsageMode {
  69                         get {
  70                                 return CurrentContext.UsageMode;
  71                         }
  72                 }
  73
  74                 public static object CreateWithContext (Type type,
  75                                                         LicenseContext creationContext)
  76                 {
  77                         return CreateWithContext (type, creationContext, new object [0]);
  78                 }
  79
  80                 public static object CreateWithContext (Type type,
  81                                                         LicenseContext creationContext,
  82                                                         object[] args)
  83                 {
  84                         object newObject = null;
  85                         lock (lockObject) {
  86                                 object contextUser = new object ();
  87                                 LicenseContext oldContext = CurrentContext;
  88                                 CurrentContext = creationContext;
  89                                 LockContext (contextUser);
  90                                 try {
  91                                         newObject = Activator.CreateInstance (type, args);
  92                                 } catch (Reflection.TargetInvocationException exception) {
  93                                         throw exception.InnerException;
  94                                 } finally {
  95                                         UnlockContext (contextUser);
  96                                         CurrentContext = oldContext;
  97                                 }
  98                         }
  99                         return newObject;
 100                 }
 101
 102                 public static bool IsLicensed (Type type)
 103                 {
 104                         License license = null;
 105                         if (!privateGetLicense (type, null, false, out license)) {
 106                                 return false;
 107                         } else {
 108                                 if (license != null)
 109                                         license.Dispose ();
 110                                 return true;
 111                         }
 112                 }
 113
 114                 public static bool IsValid (Type type)
 115                 //This method does not throw a LicenseException when it cannot grant a valid License
 116                 {
 117                         License license=null;
 118                         if (!privateGetLicense (type, null, false, out license)) {
 119                                 return false;
 120                         } else {
 121                                 if (license != null)
 122                                         license.Dispose ();
 123                                 return true;
 124                         }
 125                 }
 126
 127                 public static bool IsValid (Type type, object instance,
 128                                             out License license)
 129                 //This method does not throw a LicenseException when it cannot grant a valid License
 130                 {
 131                         return privateGetLicense (type, null, false, out license);
 132                 }
 133
 134                 public static void LockContext (object contextUser)
 135                 {
 136                         lock (lockObject) {
 137                                 contextLockUser = contextUser;
 138                         }
 139                 }
 140
 141                 public static void UnlockContext (object contextUser)
 142                 {
 143                         lock (lockObject) {
 144                                 //Ignore if we're not locked
 145                                 if (contextLockUser == null)
 146                                         return;
 147                                 //Don't unlock if not locking user
 148                                 if (contextLockUser != contextUser)
 149                                         throw new ArgumentException ("The CurrentContext property of the LicenseManager can only be unlocked with the same contextUser.");
 150                                 //Remove lock
 151                                 contextLockUser = null;
 152                         }
 153                 }
 154
 155                 public static void Validate (Type type)
 156                 // Throws a  LicenseException if the type is licensed, but a License could not be granted.
 157                 {
 158                         License license = null;
 159                         if (!privateGetLicense (type, null, true, out license))
 160                                 throw new LicenseException (type, null);
 161                         if (license != null)
 162                                 license.Dispose ();
 163                 }
 164
 165                 public static License Validate (Type type, object instance)
 166                 // Throws a  LicenseException if the type is licensed, but a License could not be granted.
 167                 {
 168                         License license=null;
 169                         if (!privateGetLicense(type, instance, true, out license))
 170                                 throw new LicenseException(type, instance);
 171                         return license;
 172                 }
 173
 174                 private static bool privateGetLicense (Type type, object instance, bool allowExceptions, out License license)
 175                 //Returns if a component is licensed, and the license if provided
 176                 {
 177                         bool isLicensed = false;
 178                         License foundLicense = null;
 179                         //Get the LicProc Attrib for our type
 180                         LicenseProviderAttribute licenseproviderattribute = (LicenseProviderAttribute) Attribute.GetCustomAttribute(type, typeof (LicenseProviderAttribute), true);
 181                         //Check it's got an attrib
 182                         if (licenseproviderattribute != null) {
 183                                 Type licenseprovidertype = licenseproviderattribute.LicenseProvider;
 184                                 //Check the attrib has a type
 185                                 if (licenseprovidertype != null) {
 186                                         //Create the provider
 187                                         LicenseProvider licenseprovider = (LicenseProvider) Activator.CreateInstance(licenseprovidertype);
 188                                         //Check we've got the provider
 189                                         if (licenseprovider != null) {
 190                                                 //Call provider, throw an LicenseException if error.
 191                                                 foundLicense = licenseprovider.GetLicense(CurrentContext, type, instance, allowExceptions);
 192                                                 if (foundLicense != null)
 193                                                         isLicensed = true;
 194                                                 //licenseprovider.Dispose();
 195                                         } else {
 196                                                 //There is was some problem creating the provider
 197                                         }
 198                                         //licenseprovidertype.Dispose();
 199                                 } else {
 200                                         //licenseprovidertype is null
 201                                 }
 202                                 //licenseproviderattribute.Dispose ();
 203                         } else {
 204                                 //Didn't have a LicenseProviderAttribute, so it's licensed
 205                                 isLicensed = true;
 206                         }
 207                         license = foundLicense;
 208                         return isLicensed;
 209                 }
 210         }
 211 }