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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / FilteredReadOnlyMetadataCollection.cs / 1305376 / FilteredReadOnlyMetadataCollection.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupOwner [....] //--------------------------------------------------------------------- using System; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.Data.Common; using System.Diagnostics; using System.Reflection; using System.Text; namespace System.Data.Metadata.Edm { internal interface IBaseList: IList { T this[string identity] { get;} new T this[int index] { get;} int IndexOf(T item); } #pragma warning disable 1711 // compiler bug: reports TDerived and TBase as type parameters for non-existing IsReadOnly property /// /// Class to filter stuff out from a metadata collection /// /* */ internal class FilteredReadOnlyMetadataCollection: ReadOnlyMetadataCollection , IBaseList where TDerived : TBase where TBase : MetadataItem { #region Constructors /// /// The constructor for constructing a read-only metadata collection to wrap another MetadataCollection. /// /// The metadata collection to wrap ///Thrown if collection argument is null /// Predicate method which determines membership internal FilteredReadOnlyMetadataCollection(ReadOnlyMetadataCollectioncollection, Predicate predicate) : base(FilterCollection(collection, predicate)) { Debug.Assert(collection != null); Debug.Assert(collection.IsReadOnly, "wrappers should only be created once loading is over, and this collection is still loading"); _source = collection; _predicate = predicate; } #endregion #region Private Fields // The original metadata collection over which this filtered collection is the view private readonly ReadOnlyMetadataCollection _source; private readonly Predicate _predicate; #endregion #region Properties /// /// Gets an item from the collection with the given identity /// /// The identity of the item to search for ///An item from the collection ///Thrown if identity argument passed in is null ///Thrown if setter is called public override TDerived this[string identity] { get { TBase item = _source[identity]; if (_predicate(item)) { return (TDerived)item; } throw EntityUtil.ItemInvalidIdentity(identity, "identity"); } } #endregion #region Methods ////// Gets an item from the collection with the given identity /// /// The identity of the item to search for /// Whether case is ignore in the search ///An item from the collection ///Thrown if identity argument passed in is null ///Thrown if the Collection does not have an item with the given identity public override TDerived GetValue(string identity, bool ignoreCase) { TBase item = _source.GetValue(identity, ignoreCase); if (_predicate(item)) { return (TDerived)item; } throw EntityUtil.ItemInvalidIdentity(identity, "identity"); } ////// Determines if this collection contains an item of the given identity /// /// The identity of the item to check for ///True if the collection contains the item with the given identity ///Thrown if identity argument passed in is null ///Thrown if identity argument passed in is empty string public override bool Contains(string identity) { TBase item; if (_source.TryGetValue(identity, false/*ignoreCase*/, out item)) { return (_predicate(item)); } return false; } ////// Gets an item from the collection with the given identity /// /// The identity of the item to search for /// Whether case is ignore in the search /// An item from the collection, null if the item is not found ///True an item is retrieved ///if identity argument is null public override bool TryGetValue(string identity, bool ignoreCase, out TDerived item) { item = null; TBase baseTypeItem; if (_source.TryGetValue(identity, ignoreCase, out baseTypeItem)) { if (_predicate(baseTypeItem)) { item = (TDerived)baseTypeItem; return true; } } return false; } internal static ListFilterCollection(ReadOnlyMetadataCollection collection, Predicate predicate) { List list = new List (collection.Count); foreach (TBase item in collection) { if (predicate(item)) { list.Add((TDerived)item); } } return list; } /// /// Get index of the element passed as the argument /// /// ///public override int IndexOf(TDerived value) { TBase item; if (_source.TryGetValue(value.Identity, false /*ignoreCase*/, out item)) { if (_predicate(item)) { // Since we are gauranteed to have a unique identity per collection, this item must of T Type return base.IndexOf((TDerived)item); } } return -1; } #endregion #region IBaseList Members TBase IBaseList .this[string identity] { get { return this[identity]; } } TBase IBaseList .this[int index] { get { return this[index]; } } /// /// Get index of the element passed as the argument /// /// ///int IBaseList .IndexOf(TBase item) { if (_predicate(item)) { return this.IndexOf((TDerived)item); } return -1; } #endregion } #pragma warning restore 1711 } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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