mcs/class/System/System.ComponentModel.Design.Serialization/InstanceDescriptor.cs

   1 //
   2 // System.ComponentModel.Design.Serialization.InstanceDescriptor.cs
   3 //
   4 // Authors:
   5 //   Martin Willemoes Hansen (mwh@sysrq.dk)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) 2003 Martin Willemoes Hansen
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Collections;
  34 using System.Reflection;
  35
  36 namespace System.ComponentModel.Design.Serialization
  37 {
  38         public sealed class InstanceDescriptor
  39         {
  40
  41                 private MemberInfo member;
  42                 private ICollection arguments;
  43                 private bool isComplete;
  44
  45                 public InstanceDescriptor (MemberInfo member, ICollection arguments)
  46                         : this (member, arguments, true)
  47                 {
  48                 }
  49
  50                 public InstanceDescriptor(MemberInfo member, ICollection arguments, bool isComplete)
  51                 {
  52                         this.isComplete = isComplete;
  53                         if (member == null)
  54                                 throw new ArgumentNullException ("member", "MemberInfo must be valid");
  55                         if (!IsMemberValid (member, arguments))
  56                                 throw new ArgumentException ("Only Constructor, Method, Field or Property members allowed", "member");
  57                         this.member = member;
  58                         this.arguments = arguments;
  59                 }
  60
  61                 private bool IsMemberValid (MemberInfo member, ICollection arguments)
  62                 {
  63                         switch (member.MemberType) {
  64                         // According to docs only these types are allowed
  65                         case MemberTypes.Constructor:
  66                                 ConstructorInfo CI = (ConstructorInfo) member;
  67                                 if (!CI.IsStatic)
  68                                         throw new ArgumentException ("InstanceDescriptor only describes static (VB.Net: shared) members", "member");
  69                                 if (arguments == null) // null counts as no arguments
  70                                         if (CI.GetParameters().Length != 0)
  71                                                 throw new ArgumentException ("Invalid number of arguments for this constructor", "arguments");
  72                                 if (arguments.Count != CI.GetParameters().Length)
  73                                         throw new ArgumentException ("Invalid number of arguments for this constructor", "arguments");
  74                                 return true;
  75                         case MemberTypes.Method:
  76                                 MethodInfo MI = (MethodInfo) member;
  77                                 if (!MI.IsStatic)
  78                                         throw new ArgumentException ("InstanceDescriptor only describes static (VB.Net: shared) members", "member");
  79                                 if (arguments == null) // null counts as no arguments
  80                                         if (MI.GetParameters().Length != 0)
  81                                                 throw new ArgumentException ("Invalid number of arguments for this method", "arguments");
  82                                 if (arguments.Count != MI.GetParameters().Length)
  83                                         throw new ArgumentException ("Invalid number of arguments for this method", "arguments");
  84                                 return true;
  85                         case MemberTypes.Field:
  86                                 FieldInfo FI = (FieldInfo) member;
  87                                 if (!FI.IsStatic)
  88                                         throw new ArgumentException ("InstanceDescriptor only describes static (VB.Net: shared) members", "member");
  89                                 if (arguments == null) // null counts as no arguments
  90                                         return true;
  91                                 if (arguments.Count == 0)
  92                                         throw new ArgumentException ("Field members do not take any arguments", "arguments");
  93                                 return true;
  94                         case MemberTypes.Property:
  95                                 PropertyInfo PI = (PropertyInfo) member;
  96                                 if (!(PI.CanRead))
  97                                         throw new ArgumentException ("That property cannot be read", "member");
  98                                 MethodInfo PIM = PI.GetGetMethod();
  99                                 if (!PIM.IsStatic)
 100                                         throw new ArgumentException ("InstanceDescriptor only describes static (VB.Net: shared) members", "member");
 101                                 if (arguments == null) // null counts as no arguments
 102                                         if (PIM.GetParameters().Length != 0)
 103                                                 throw new ArgumentException ("Invalid number of arguments for this property", "arguments");
 104                                 if (arguments.Count != PIM.GetParameters().Length)
 105                                         throw new ArgumentException ("Invalid number of arguments for this property", "arguments");
 106                                 return true;
 107                         }
 108                         return false;
 109                 }
 110
 111                 public ICollection Arguments {
 112                         get {
 113                                 // It seems MS does not return null even if we specified null as parameter (but does not cause an exception)
 114                                 if (arguments == null)
 115                                         return new object[0];
 116                                 return arguments;
 117                         }
 118                 }
 119
 120                 public bool IsComplete {
 121                         get { return isComplete; }
 122                 }
 123
 124                 public MemberInfo MemberInfo {
 125                         get { return member; }
 126                 }
 127
 128                 public object Invoke()
 129                 {
 130                         object[] parsearguments;
 131                         if (arguments == null)
 132                                 parsearguments = new object[0];
 133                         else {
 134                                 parsearguments = new object[arguments.Count - 1];
 135                                 arguments.CopyTo (parsearguments, 0);
 136                         }
 137
 138                         //MemberInfo member;
 139                         switch (member.MemberType) {
 140                         case MemberTypes.Constructor:
 141                                 ConstructorInfo CI = (ConstructorInfo) member;
 142                                 return CI.Invoke (parsearguments);
 143
 144                         case MemberTypes.Method:
 145                                 MethodInfo MI = (MethodInfo) member;
 146                                 return MI.Invoke (null, parsearguments);
 147
 148                         case MemberTypes.Field:
 149                                 FieldInfo FI = (FieldInfo) member;
 150                                 return FI.GetValue (null);
 151
 152                         case MemberTypes.Property:
 153                                 PropertyInfo PI = (PropertyInfo) member;
 154                                 return PI.GetValue (null, parsearguments);
 155                         }
 156                         return null;
 157                 }
 158         }
 159 }