1 //
2 // System.Runtime.Remoting.Contexts.ContextAttribute.cs
3 //
4 // Author:
5 //   Miguel de Icaza (miguel@ximian.com)
6 //
7 // (C) Ximian, Inc.  http://www.ximian.com
8 //
9 
10 //
11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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.Runtime.Remoting.Activation;
34 using System.Collections;
35 
36 namespace System.Runtime.Remoting.Contexts {
37 
38 	[AttributeUsage (AttributeTargets.Class)]
39 	[Serializable]
40 	[System.Runtime.InteropServices.ComVisible (true)]
41 	public class ContextAttribute : Attribute, IContextAttribute, IContextProperty {
42 		protected string AttributeName;
43 
ContextAttribute(string name)44 		public ContextAttribute (string name)
45 		{
46 			AttributeName = name;
47 		}
48 
49 		public virtual string Name {
50 			get {
51 				return AttributeName;
52 			}
53 		}
54 
Equals(object o)55 		public override bool Equals (object o)
56 		{
57 			if (o == null)
58 				return false;
59 
60 			if (!(o is ContextAttribute))
61 				return false;
62 
63 			ContextAttribute ca = (ContextAttribute) o;
64 
65 			if (ca.AttributeName != AttributeName)
66 				return false;
67 
68 			return true;
69 		}
70 
Freeze(Context newContext)71 		public virtual void Freeze (Context newContext)
72 		{
73 		}
74 
GetHashCode()75 		public override int GetHashCode ()
76 		{
77 			if (AttributeName == null)
78 				return 0;
79 
80 			return AttributeName.GetHashCode ();
81 		}
82 
83 		/// <summary>
84 		///    Adds the current context property to the IConstructionCallMessage
85 		/// </summary>
GetPropertiesForNewContext(IConstructionCallMessage ctorMsg)86 		public virtual void GetPropertiesForNewContext (IConstructionCallMessage ctorMsg)
87 		{
88 			if (ctorMsg == null)
89 				throw new ArgumentNullException ("ctorMsg");
90 
91 			IList list = ctorMsg.ContextProperties;
92 
93 			list.Add (this);
94 		}
95 
96 		// <summary>
97 		//   True whether the context arguments satisfies the requirements
98 		//   of the current context.
99 		// </summary>
IsContextOK(Context ctx, IConstructionCallMessage ctorMsg)100 		public virtual bool IsContextOK (Context ctx, IConstructionCallMessage ctorMsg)
101 		{
102 			if (ctorMsg == null)
103 				throw new ArgumentNullException ("ctorMsg");
104 			if (ctx == null)
105 				throw new ArgumentNullException ("ctx");
106 
107 			if (!ctorMsg.ActivationType.IsContextful)
108 				return true;
109 
110 			IContextProperty p = ctx.GetProperty (AttributeName);
111 			if (p == null)
112 				return false;
113 
114 			if (this != p)
115 				return false;
116 
117 			return true;
118 		}
119 
IsNewContextOK(Context newCtx)120 		public virtual bool IsNewContextOK (Context newCtx)
121 		{
122 			return true;
123 		}
124 	}
125 }
126