211 lines
7.5 KiB
C#
211 lines
7.5 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.Threading;
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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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partial class WeakCollection<TItem> {
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#region IEnumerable Members
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/// <summary>Returns an enumerator that iterates through a collection.</summary>
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/// <returns>
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/// A System.Collections.IEnumerator object that can be used to iterate through
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/// the collection.
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/// </returns>
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IEnumerator IEnumerable.GetEnumerator() {
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return GetEnumerator();
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}
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#endregion
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#region IList Members
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/// <summary>Adds an item to the WeakCollection.</summary>
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/// <param name="value">The System.Object to add to the WeakCollection.</param>
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/// <returns>The position into which the new element was inserted.</returns>
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/// <exception cref="System.NotSupportedException">
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/// The System.Collections.IList is read-only or the WeakCollection has a fixed size.
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/// </exception>
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int IList.Add(object value) {
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TItem valueAsItemType = downcastToItemType(value);
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return (this.items as IList).Add(new WeakReference<TItem>(valueAsItemType));
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}
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/// <summary>
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/// Determines whether the WeakCollection contains a specific value.
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/// </summary>
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/// <param name="value">The System.Object to locate in the WeakCollection.</param>
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/// <returns>
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/// True if the System.Object is found in the WeakCollection; otherwise, false.
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/// </returns>
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bool IList.Contains(object value) {
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TItem valueAsItemType = downcastToItemType(value);
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return Contains(valueAsItemType);
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}
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/// <summary>Determines the index of a specific item in the WeakCollection.</summary>
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/// <param name="value">The System.Object to locate in the WeakCollection.</param>
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/// <returns>
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/// The index of value if found in the list; otherwise, -1.
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/// </returns>
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int IList.IndexOf(object value) {
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TItem valueAsItemType = downcastToItemType(value);
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return IndexOf(valueAsItemType);
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}
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/// <summary>
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/// Inserts an item to the WeakCollection at the specified index.
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/// </summary>
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/// <param name="index">
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/// The zero-based index at which value should be inserted.
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/// </param>
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/// <param name="value">The System.Object to insert into the WeakCollection.</param>
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/// <exception cref="System.ArgumentOutOfRangeException">
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/// Index is not a valid index in the TransformingReadOnlyCollection.
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/// </exception>
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/// <exception cref="System.NotSupportedException">
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/// The System.Collections.IList is read-only or the WeakCollection has a fixed size.
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/// </exception>
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/// <exception cref="System.NullReferenceException">
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/// Value is null reference in the WeakCollection.
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/// </exception>
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void IList.Insert(int index, object value) {
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TItem valueAsItemType = downcastToItemType(value);
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Insert(index, valueAsItemType);
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}
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/// <summary>
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/// A value indicating whether the WeakCollection has a fixed size.
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/// </summary>
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bool IList.IsFixedSize {
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get { return (this.items as IList).IsFixedSize; }
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}
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/// <summary>
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/// Removes the first occurrence of a specific object from the WeakCollection.
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/// </summary>
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/// <param name="value">The System.Object to remove from the WeakCollection.</param>
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/// <exception cref="System.NotSupportedException">
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/// The WeakCollection is read-only or the WeakCollection has a fixed size.
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/// </exception>
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void IList.Remove(object value) {
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TItem valueAsItemType = downcastToItemType(value);
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Remove(valueAsItemType);
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}
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/// <summary>Gets or sets the element at the specified index.</summary>
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/// <param name="index">The zero-based index of the element to get or set.</param>
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/// <returns>The element at the specified index</returns>
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/// <exception cref="System.ArgumentOutOfRangeException">
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/// Index is not a valid index in the WeakCollection
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/// </exception>
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object IList.this[int index] {
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get { return this[index]; }
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set {
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TItem valueAsItemType = downcastToItemType(value);
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this[index] = valueAsItemType;
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}
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}
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#endregion
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#region ICollection Members
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/// <summary>
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/// Copies the elements of the WeakCollection to an System.Array, starting at
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/// a particular System.Array index.
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/// </summary>
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/// <param name="array">
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/// The one-dimensional System.Array that is the destination of the elements
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/// copied from WeakCollection. The System.Array must have zero-based indexing.
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/// </param>
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/// <param name="index">The zero-based index in array at which copying begins.</param>
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/// <exception cref="System.ArgumentNullException">
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/// Array is null.
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/// </exception>
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/// <exception cref="System.ArgumentOutOfRangeException">
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/// Index is less than zero.
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/// </exception>
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/// <exception cref="System.ArgumentException">
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/// Array is multidimensional or index is equal to or greater than the length
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/// of array or the number of elements in the source WeakCollection is greater than
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/// the available space from index to the end of the destination array.
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/// </exception>
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/// <exception cref="System.InvalidCastException">
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/// The type of the source WeakCollection cannot be cast automatically to the type of
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/// the destination array.
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/// </exception>
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void ICollection.CopyTo(Array array, int index) {
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CopyTo((TItem[])array, index);
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}
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/// <summary>
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/// A value indicating whether access to the WeakCollection is
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/// synchronized (thread safe).
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/// </summary>
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bool ICollection.IsSynchronized {
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get { return false; }
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}
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/// <summary>
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/// An object that can be used to synchronize access to the WeakCollection.
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/// </summary>
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object ICollection.SyncRoot {
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get {
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if(this.syncRoot == null) {
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ICollection is2 = this.items as ICollection;
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if(is2 != null) {
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this.syncRoot = is2.SyncRoot;
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} else {
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Interlocked.CompareExchange(ref this.syncRoot, new object(), null);
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}
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}
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return this.syncRoot;
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}
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}
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#endregion
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/// <summary>
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/// Downcasts an object reference to a reference to the collection's item type
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/// </summary>
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/// <param name="value">Object reference that will be downcast</param>
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/// <returns>
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/// The specified object referecne as a reference to the collection's item type
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/// </returns>
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private static TItem downcastToItemType(object value) {
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TItem valueAsItemType = value as TItem;
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if(!ReferenceEquals(value, null)) {
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if(valueAsItemType == null) {
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throw new ArgumentException("Object is not of a compatible type", "value");
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}
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}
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return valueAsItemType;
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}
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}
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} // namespace Nuclex.Support.Collections
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