caeee49f4a
git-svn-id: file:///srv/devel/repo-conversion/nusu@43 d2e56fa2-650e-0410-a79f-9358c0239efd
81 lines
3.3 KiB
C#
81 lines
3.3 KiB
C#
#region CPL License
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/*
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Nuclex Framework
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Copyright (C) 2002-2007 Nuclex Development Labs
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This library is free software; you can redistribute it and/or
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modify it under the terms of the IBM Common Public License as
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published by the IBM Corporation; either version 1.0 of the
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License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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IBM Common Public License for more details.
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You should have received a copy of the IBM Common Public
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License along with this library
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*/
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#endregion
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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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using System.Collections.ObjectModel;
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using Nuclex.Support.Collections;
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namespace Nuclex.Support.Tracking {
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/// <summary>Collection of progressions with a weighting value</summary>
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/// <typeparam name="ProgressionType">Type of progressions to manage</typeparam>
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/// <remarks>
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/// <para>
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/// This collection is exposed as a read-only collection to the user that
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/// stores WeightedProgressions. Internally, it merely wraps a collection of
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/// an internal type used to keep track of the individual progression's
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/// progress in the SetProgression and QueueOperation classes.
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/// </para>
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/// <para>
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/// It is read-only because the design requires a progression to only ever
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/// finish once. If it was possible eg. to add items after a SetProgression
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/// had signalled itself as being finished, it would be moved into an
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/// unfinished state again. Also, an empty SetProgression is, by definition,
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/// finished (simply because there is no work to do) - unless the contents
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/// of set are passed to the SetProgression's constructor and never modified
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/// at all, the design would be violated as soon as ab instance of the
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/// SetProgression or QueueOperation classes was created.
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/// </para>
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/// </remarks>
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internal class WeightedProgressionWrapperCollection<ProgressionType> :
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TransformingReadOnlyCollection<
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ObservedWeightedProgression<ProgressionType>, WeightedProgression<ProgressionType>
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>
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where ProgressionType : Progression {
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/// <summary>Initializes a new weighted progression collection wrapper</summary>
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/// <param name="items">Items to be exposed as weighted progressions</param>
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internal WeightedProgressionWrapperCollection(
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IList<ObservedWeightedProgression<ProgressionType>> items
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)
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: base(items) { }
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/// <summary>Transforms an item into the exposed type</summary>
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/// <param name="item">Item to be transformed</param>
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/// <returns>The transformed item</returns>
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/// <remarks>
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/// This method is used to transform an item in the wrapped collection into
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/// the exposed item type whenever the user accesses an item. Expect it to
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/// be called frequently, because the TransformingReadOnlyCollection does
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/// not cache otherwise store the transformed items.
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/// </remarks>
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protected override WeightedProgression<ProgressionType> Transform(
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ObservedWeightedProgression<ProgressionType> item
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) {
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return item.WeightedProgression;
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}
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}
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} // namespace Nuclex.Support.Tracking
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