Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/WebParts/WebPartTransformerCollection.cs

@@ -0,0 +1,99 @@
+//------------------------------------------------------------------------------
+// <copyright file="WebPartTransformerCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+namespace System.Web.UI.WebControls.WebParts {
+
+    using System;
+    using System.Collections;
+
+    public sealed class WebPartTransformerCollection : CollectionBase {
+
+        private bool _readOnly;
+
+        public bool IsReadOnly {
+            get {
+                return _readOnly;
+            }
+        }
+
+        public WebPartTransformer this[int index] {
+            get {
+                return (WebPartTransformer) List[index];
+            }
+            set {
+                List[index] = value;
+            }
+        }
+
+        public int Add(WebPartTransformer transformer) {
+            return List.Add(transformer);
+        }
+
+        private void CheckReadOnly() {
+            if (_readOnly) {
+                throw new InvalidOperationException(SR.GetString(SR.WebPartTransformerCollection_ReadOnly));
+            }
+        }
+
+        public bool Contains(WebPartTransformer transformer) {
+            return List.Contains(transformer);
+        }
+
+        public void CopyTo(WebPartTransformer[] array, int index) {
+            List.CopyTo(array, index);
+        }
+
+        public int IndexOf(WebPartTransformer transformer) {
+            return List.IndexOf(transformer);
+        }
+
+        public void Insert(int index, WebPartTransformer transformer) {
+            List.Insert(index, transformer);
+        }
+
+        protected override void OnClear() {
+            CheckReadOnly();
+            base.OnClear();
+        }
+
+        protected override void OnInsert(int index, object value) {
+            CheckReadOnly();
+
+            if (List.Count > 0) {
+                throw new InvalidOperationException(SR.GetString(SR.WebPartTransformerCollection_NotEmpty));
+            }
+
+            base.OnInsert(index, value);
+        }
+
+        protected override void OnRemove(int index, object value) {
+            CheckReadOnly();
+            base.OnRemove(index, value);
+        }
+
+        protected override void OnSet(int index, object oldValue, object newValue) {
+            CheckReadOnly();
+            base.OnSet(index, oldValue, newValue);
+        }
+
+        protected override void OnValidate(object value) {
+            base.OnValidate(value);
+            if (value == null) {
+                throw new ArgumentNullException("value", SR.GetString(SR.Collection_CantAddNull));
+            }
+            if (!(value is WebPartTransformer)) {
+                throw new ArgumentException(SR.GetString(SR.Collection_InvalidType, "WebPartTransformer"), "value");
+            }
+        }
+
+        public void Remove(WebPartTransformer transformer) {
+            List.Remove(transformer);
+        }
+
+        internal void SetReadOnly() {
+            _readOnly = true;
+        }
+    }
+}