d813756eed
git-svn-id: file:///srv/devel/repo-conversion/nusu@4 d2e56fa2-650e-0410-a79f-9358c0239efd
95 lines
3.4 KiB
C#
95 lines
3.4 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.IO;
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using System.Reflection;
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namespace Nuclex.Support.Collections {
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/// <summary>Collection that automatically assigns an owner to all its elements</summary>
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/// <remarks>
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/// This collection automatically assigns a parent object to elements that
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/// are managed in it. The elements have to derive from the Parentable<>
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/// base class.
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/// </remarks>
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/// <typeparam name="ParentType">Type of the parent object to assign to items</typeparam>
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/// <typeparam name="ItemType">Type of the items being managed in the collection</typeparam>
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public class ParentingCollection<ParentType, ItemType> : Collection<ItemType>
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where ItemType : Parentable<ParentType>
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where ParentType : class {
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/// <summary>Reparents all elements in the collection</summary>
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/// <param name="parent">New parent to take ownership of the items</param>
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protected void Reparent(ParentType parent) {
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this.parent = parent;
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for(int index = 0; index < Count; ++index)
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base[index].SetParent(parent);
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}
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/// <summary>Clears all elements from the collection</summary>
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protected override void ClearItems() {
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for(int index = 0; index < Count; ++index)
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base[index].SetParent(null);
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base.ClearItems();
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}
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/// <summary>Inserts a new element into the collection</summary>
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/// <param name="index">Index at which to insert the element</param>
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/// <param name="item">Item to be inserted</param>
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protected override void InsertItem(int index, ItemType item) {
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base.InsertItem(index, item);
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item.SetParent(this.parent);
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}
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/// <summary>Removes an element from the collection</summary>
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/// <param name="index">Index of the element to remove</param>
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protected override void RemoveItem(int index) {
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base[index].SetParent(null);
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base.RemoveItem(index);
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}
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/// <summary>Takes over a new element that is directly assigned</summary>
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/// <param name="index">Index of the element that was assigned</param>
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/// <param name="item">New item</param>
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protected override void SetItem(int index, ItemType item) {
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base.SetItem(index, item);
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item.SetParent(this.parent);
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}
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/// <summary>Disposes the collection and optionally all items contained therein</summary>
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/// <param name="disposeItems">Whether to try calling Dispose() on all items</param>
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/// <remarks>
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/// This method is intended to support collections that need to dispose their
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/// items. The ParentingCollection will first detach all items from the parent
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/// object and them call Dispose() on any item that implements IDisposable.
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/// </remarks>
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protected void InternalDispose(bool disposeItems) {
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if(disposeItems) {
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// Have the items do their cleanup work
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Reparent(null);
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// Dispose of all the items in the collection that implement IDisposable
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foreach(ItemType item in this) {
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IDisposable disposable = item as IDisposable;
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if(disposable != null)
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disposable.Dispose();
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}
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}
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// Remove all items from the collection
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base.ClearItems();
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}
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/// <summary>Parent this collection currently belongs to</summary>
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private ParentType parent;
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}
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} // namespace Nuclex.Support.Collections
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