Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/compmod/system/componentmodel/ReadOnlyAttribute.cs

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+//------------------------------------------------------------------------------
+// <copyright file="ReadOnlyAttribute.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ */
+namespace System.ComponentModel {
+
+    using System;
+    using System.Diagnostics;
+    using System.Security.Permissions;
+
+    /// <devdoc>
+    ///    <para>Specifies whether the property this attribute is bound to
+    ///       is read-only or read/write.</para>
+    /// </devdoc>
+    [AttributeUsage(AttributeTargets.All)]
+    public sealed class ReadOnlyAttribute : Attribute {
+        private bool isReadOnly = false;
+
+        /// <devdoc>
+        ///    <para>
+        ///       Specifies that the property this attribute is bound to is read-only and
+        ///       cannot be modified in the server explorer. This <see langword='static '/>field is
+        ///       read-only.
+        ///    </para>
+        /// </devdoc>
+        public static readonly ReadOnlyAttribute Yes = new ReadOnlyAttribute(true);
+
+        /// <devdoc>
+        ///    <para>
+        ///       Specifies that the property this attribute is bound to is read/write and can
+        ///       be modified at design time. This <see langword='static '/>field is read-only.
+        ///    </para>
+        /// </devdoc>
+        public static readonly ReadOnlyAttribute No = new ReadOnlyAttribute(false);
+
+        /// <devdoc>
+        ///    <para>
+        ///       Specifies the default value for the <see cref='System.ComponentModel.ReadOnlyAttribute'/> , which is <see cref='System.ComponentModel.ReadOnlyAttribute.No'/>, that is,
+        ///       the property this attribute is bound to is read/write. This <see langword='static'/> field is read-only.
+        ///    </para>
+        /// </devdoc>
+        public static readonly ReadOnlyAttribute Default = No;
+
+        /// <devdoc>
+        ///    <para>
+        ///       Initializes a new instance of the <see cref='System.ComponentModel.ReadOnlyAttribute'/> class.
+        ///    </para>
+        /// </devdoc>
+        public ReadOnlyAttribute(bool isReadOnly) {
+            this.isReadOnly = isReadOnly;
+        }
+
+        /// <devdoc>
+        ///    <para>
+        ///       Gets a value indicating whether the property this attribute is bound to is
+        ///       read-only.
+        ///    </para>
+        /// </devdoc>
+        public bool IsReadOnly {
+            get {
+                return isReadOnly;
+            }
+        }
+
+        /// <internalonly/>
+        /// <devdoc>
+        /// </devdoc>
+        public override bool Equals(object value) {
+
+            if (this == value) {
+                return true;
+            }
+
+            ReadOnlyAttribute other = value as ReadOnlyAttribute;
+
+            return other != null && other.IsReadOnly == IsReadOnly;
+        }
+
+        /// <devdoc>
+        ///    <para>
+        ///       Returns the hashcode for this object.
+        ///    </para>
+        /// </devdoc>
+        public override int GetHashCode() {
+            return base.GetHashCode();
+        }
+
+        /// <internalonly/>
+        /// <devdoc>
+        ///    <para>
+        ///       Determines if this attribute is the default.
+        ///    </para>
+        /// </devdoc>
+        public override bool IsDefaultAttribute() {
+            return (this.IsReadOnly == Default.IsReadOnly);
+        }
+    }
+}
+