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                 private static LicenseContext mycontext = null;
  40                 private static object contextLockUser = null;
  41
  42                 private LicenseManager ()
  43                 {
  44                 }
  45
  46                 public static LicenseContext CurrentContext {
  47                         get {
  48                                 lock (typeof(LicenseManager)) {
  49                                         //Tests indicate a System.ComponentModel.Design.RuntimeLicenseContext should be returned.
  50                                         if  (mycontext==null)
  51                                                 mycontext = new Design.RuntimeLicenseContext();
  52                                         return mycontext;
  53                                 }
  54                         }
  55                         set {
  56                                 lock (typeof(LicenseManager)) {
  57                                         if (contextLockUser==null) {
  58                                                 mycontext = value;
  59                                         } else {
  60                                                 throw new InvalidOperationException("The CurrentContext property of the LicenseManager is currently locked and cannot be changed.");
  61                                         }
  62                                 }
  63                         }
  64                 }
  65
  66                 public static LicenseUsageMode UsageMode {
  67                         get {
  68                                 return CurrentContext.UsageMode;
  69                         }
  70                 }
  71
  72                 public static object CreateWithContext (Type type,
  73                                                         LicenseContext creationContext)
  74                 {
  75                         return CreateWithContext (type, creationContext, new object [0]);
  76                 }
  77
  78                 public static object CreateWithContext (Type type,
  79                                                         LicenseContext creationContext,
  80                                                         object[] args)
  81                 {
  82                         object newObject = null;
  83                         lock (typeof (LicenseManager)) {
  84                                 object lockObject = new object ();
  85                                 LicenseContext oldContext = CurrentContext;
  86                                 CurrentContext = creationContext;
  87                                 LockContext (lockObject);
  88                                 try {
  89                                         newObject = Activator.CreateInstance (type, args);
  90                                 } catch (Reflection.TargetInvocationException exception) {
  91                                         throw exception.InnerException;
  92                                 } finally {
  93                                         UnlockContext (lockObject);
  94                                         CurrentContext = oldContext;
  95                                 }
  96                         }
  97                         return newObject;
  98                 }
  99
 100                 public static bool IsLicensed (Type type)
 101                 {
 102                         License license = null;
 103                         if (!privateGetLicense (type, null, false, out license)) {
 104                                 return false;
 105                         } else {
 106                                 if (license != null)
 107                                         license.Dispose ();
 108                                 return true;
 109                         }
 110                 }
 111
 112                 public static bool IsValid (Type type)
 113                 //This method does not throw a LicenseException when it cannot grant a valid License
 114                 {
 115                         License license=null;
 116                         if (!privateGetLicense (type, null, false, out license)) {
 117                                 return false;
 118                         } else {
 119                                 if (license != null)
 120                                         license.Dispose ();
 121                                 return true;
 122                         }
 123                 }
 124
 125                 public static bool IsValid (Type type, object instance,
 126                                             out License license)
 127                 //This method does not throw a LicenseException when it cannot grant a valid License
 128                 {
 129                         return privateGetLicense (type, null, false, out license);
 130                 }
 131
 132                 public static void LockContext (object contextUser)
 133                 {
 134                         lock (typeof (LicenseManager)) {
 135                                 contextLockUser = contextUser;
 136                         }
 137                 }
 138
 139                 public static void UnlockContext (object contextUser)
 140                 {
 141                         lock (typeof(LicenseManager)) {
 142                                 //Ignore if we're not locked
 143                                 if (contextLockUser == null)
 144                                         return;
 145                                 //Don't unlock if not locking user
 146                                 if (contextLockUser != contextUser)
 147                                         throw new ArgumentException ("The CurrentContext property of the LicenseManager can only be unlocked with the same contextUser.");
 148                                 //Remove lock
 149                                 contextLockUser = null;
 150                         }
 151                 }
 152
 153                 public static void Validate (Type type)
 154                 // Throws a  LicenseException if the type is licensed, but a License could not be granted.
 155                 {
 156                         License license = null;
 157                         if (!privateGetLicense (type, null, true, out license))
 158                                 throw new LicenseException (type, null);
 159                         if (license != null)
 160                                 license.Dispose ();
 161                 }
 162
 163                 public static License Validate (Type type, object instance)
 164                 // Throws a  LicenseException if the type is licensed, but a License could not be granted.
 165                 {
 166                         License license=null;
 167                         if (!privateGetLicense(type, instance, true, out license))
 168                                 throw new LicenseException(type, instance);
 169                         return license;
 170                 }
 171
 172                 private static bool privateGetLicense (Type type, object instance, bool allowExceptions, out License license)
 173                 //Returns if a component is licensed, and the license if provided
 174                 {
 175                         bool isLicensed = false;
 176                         License foundLicense = null;
 177                         //Get the LicProc Attrib for our type
 178                         LicenseProviderAttribute licenseproviderattribute = (LicenseProviderAttribute) Attribute.GetCustomAttribute(type, typeof (LicenseProviderAttribute), true);
 179                         //Check it's got an attrib
 180                         if (licenseproviderattribute != null) {
 181                                 Type licenseprovidertype = licenseproviderattribute.LicenseProvider;
 182                                 //Check the attrib has a type
 183                                 if (licenseprovidertype != null) {
 184                                         //Create the provider
 185                                         LicenseProvider licenseprovider = (LicenseProvider) Activator.CreateInstance(licenseprovidertype);
 186                                         //Check we've got the provider
 187                                         if (licenseprovider != null) {
 188                                                 //Call provider, throw an LicenseException if error.
 189                                                 foundLicense = licenseprovider.GetLicense(CurrentContext, type, instance, allowExceptions);
 190                                                 if (foundLicense != null)
 191                                                         isLicensed = true;
 192                                                 //licenseprovider.Dispose();
 193                                         } else {
 194                                                 //There is was some problem creating the provider
 195                                         }
 196                                         //licenseprovidertype.Dispose();
 197                                 } else {
 198                                         //licenseprovidertype is null
 199                                 }
 200                                 //licenseproviderattribute.Dispose ();
 201                         } else {
 202                                 //Didn't have a LicenseProviderAttribute, so it's licensed
 203                                 isLicensed = true;
 204                         }
 205                         license = foundLicense;
 206                         return isLicensed;
 207                 }
 208         }
 209 }