Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System/compmod/system/componentmodel/ImmutableObjectAttribute.cs

@@ -0,0 +1,84 @@
+ 
+namespace System.ComponentModel {
+    using System;
+    using System.Diagnostics;
+    using System.Security.Permissions;
+
+    /// <devdoc>
+    ///  Specifies that a object has no sub properties that are editable.
+    /// </devdoc>
+    [AttributeUsage(AttributeTargets.All)]
+    public sealed class ImmutableObjectAttribute : Attribute {
+         
+         /// <devdoc>
+         ///  Specifies that a object has no sub properties that are editable.
+         ///
+         ///  This is usually used in the properties window to determine if an expandable object
+         ///  should be rendered as read-only.
+         /// </devdoc>
+         public static readonly ImmutableObjectAttribute Yes = new ImmutableObjectAttribute(true);
+         
+         /// <devdoc>
+         ///  Specifies that a object has at least one editable sub-property.
+         ///
+         ///  This is usually used in the properties window to determine if an expandable object
+         ///  should be rendered as read-only.
+         /// </devdoc>
+         public static readonly ImmutableObjectAttribute No = new ImmutableObjectAttribute(false);
+         
+         
+         /// <devdoc>
+         ///  Defaults to ImmutableObjectAttribute.No
+         /// </devdoc>
+         public static readonly ImmutableObjectAttribute Default = No;
+         
+         private bool immutable = true;
+         
+         /// <devdoc>
+         ///  Constructs an ImmutableObjectAttribute object.
+         ///
+         /// </devdoc>
+         public ImmutableObjectAttribute(bool immutable) {
+            this.immutable = immutable;
+         }
+         
+         /// <devdoc>
+         ///    <para>[To be supplied.]</para>
+         /// </devdoc>
+         public bool Immutable {
+             get {
+               return immutable;
+             }
+         }
+         
+         /// <internalonly/>
+         /// <devdoc>
+         /// </devdoc>
+         public override bool Equals(object obj) {
+            if (obj == this) {
+                return true;
+            }
+
+            ImmutableObjectAttribute other = obj as ImmutableObjectAttribute;
+            return other != null && other.Immutable == this.immutable;
+         }
+         
+         /// <devdoc>
+         ///    <para>
+         ///       Returns the hashcode for this object.
+         ///    </para>
+         /// </devdoc>
+         public override int GetHashCode() {
+             return base.GetHashCode();
+         }
+
+         /// <internalonly/>
+         /// <devdoc>
+         /// </devdoc>
+         public override bool IsDefaultAttribute() {
+            return (this.Equals(Default));
+         }
+
+    }
+}
+