140 lines
4.8 KiB
C#
140 lines
4.8 KiB
C#
#region Apache License 2.0
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/*
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Nuclex .NET Framework
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Copyright (C) 2002-2024 Markus Ewald / Nuclex Development Labs
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#endregion // Apache License 2.0
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using System;
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using System.Collections;
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using System.Collections.Generic;
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namespace Nuclex.Support.Collections {
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/// <summary>Wraps a Collection and prevents users from modifying it</summary>
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/// <typeparam name="TItem">Type of items to manage in the Collection</typeparam>
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public class ReadOnlyCollection<TItem> :
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ICollection<TItem>,
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ICollection {
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/// <summary>Initializes a new read-only Collection wrapper</summary>
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/// <param name="collection">Collection that will be wrapped</param>
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public ReadOnlyCollection(ICollection<TItem> collection) {
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this.typedCollection = collection;
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this.objectCollection = (collection as ICollection);
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}
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/// <summary>Determines whether the List contains the specified item</summary>
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/// <param name="item">Item that will be checked for</param>
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/// <returns>True if the specified item is contained in the List</returns>
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public bool Contains(TItem item) {
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return this.typedCollection.Contains(item);
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}
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/// <summary>Copies the contents of the List into an array</summary>
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/// <param name="array">Array the List will be copied into</param>
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/// <param name="arrayIndex">
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/// Starting index at which to begin filling the destination array
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/// </param>
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public void CopyTo(TItem[] array, int arrayIndex) {
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this.typedCollection.CopyTo(array, arrayIndex);
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}
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/// <summary>The number of items current contained in the List</summary>
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public int Count {
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get { return this.typedCollection.Count; }
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}
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/// <summary>Whether the List is write-protected</summary>
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public bool IsReadOnly {
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get { return true; }
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}
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/// <summary>Returns a new enumerator over the contents of the List</summary>
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/// <returns>The new List contents enumerator</returns>
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public IEnumerator<TItem> GetEnumerator() {
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return this.typedCollection.GetEnumerator();
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}
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#region ICollection<> implementation
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/// <summary>Adds an item to the end of the List</summary>
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/// <param name="item">Item that will be added to the List</param>
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void ICollection<TItem>.Add(TItem item) {
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throw new NotSupportedException(
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"Adding items is not supported by the read-only List"
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);
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}
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/// <summary>Removes all items from the List</summary>
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void ICollection<TItem>.Clear() {
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throw new NotSupportedException(
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"Clearing is not supported by the read-only List"
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);
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}
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/// <summary>Removes the specified item from the List</summary>
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/// <param name="item">Item that will be removed from the List</param>
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/// <returns>True of the specified item was found in the List and removed</returns>
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bool ICollection<TItem>.Remove(TItem item) {
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throw new NotSupportedException(
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"Removing items is not supported by the read-only List"
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);
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}
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#endregion
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#region IEnumerable implementation
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/// <summary>Returns a new enumerator over the contents of the List</summary>
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/// <returns>The new List contents enumerator</returns>
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IEnumerator IEnumerable.GetEnumerator() {
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return this.objectCollection.GetEnumerator();
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}
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#endregion
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#region ICollection implementation
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/// <summary>Copies the contents of the List into an array</summary>
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/// <param name="array">Array the List will be copied into</param>
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/// <param name="index">
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/// Starting index at which to begin filling the destination array
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/// </param>
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void ICollection.CopyTo(Array array, int index) {
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this.objectCollection.CopyTo(array, index);
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}
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/// <summary>Whether the List is synchronized for multi-threaded usage</summary>
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bool ICollection.IsSynchronized {
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get { return this.objectCollection.IsSynchronized; }
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}
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/// <summary>Synchronization root on which the List locks</summary>
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object ICollection.SyncRoot {
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get { return this.objectCollection.SyncRoot; }
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}
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#endregion
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/// <summary>The wrapped Collection under its type-safe interface</summary>
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private ICollection<TItem> typedCollection;
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/// <summary>The wrapped Collection under its object interface</summary>
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private ICollection objectCollection;
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}
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} // namespace Nuclex.Support.Collections
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