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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Metadata / Edm / ReadOnlyMetadataCollection.cs / 1305376 / ReadOnlyMetadataCollection.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 { ////// Class representing a read-only wrapper around MetadataCollection /// ///The type of items in this collection public class ReadOnlyMetadataCollection: System.Collections.ObjectModel.ReadOnlyCollection where T : 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 internal ReadOnlyMetadataCollection(IListcollection) : base(collection) { } #endregion #region InnerClasses // On the surface, this Enumerator doesn't do anything but delegating to the underlying enumerator /// /// The enumerator for MetadataCollection /// [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1815:OverrideEqualsAndOperatorEqualsOnValueTypes")] public struct Enumerator : IEnumerator{ /// /// Constructor for the enumerator /// /// The collection that this enumerator should enumerate on internal Enumerator(IListcollection) { _parent = collection; _nextIndex = 0; _current = null; } private int _nextIndex; private IList _parent; private T _current; /// /// Gets the member at the current position /// public T Current { get { return _current; } } ////// Gets the member at the current position /// object IEnumerator.Current { get { return this.Current; } } ////// Dispose this enumerator /// public void Dispose() { } ////// Move to the next member in the collection /// ///True if the enumerator is moved public bool MoveNext() { if ((uint)_nextIndex < (uint)_parent.Count) { _current = _parent[_nextIndex]; _nextIndex++; return true; } _current = null; return false; } ////// Sets the enumerator to the initial position before the first member /// public void Reset() { _current = null; _nextIndex = 0; } } #endregion #region Properties ////// Gets whether the collection is a readonly collection /// public bool IsReadOnly { get { return true; } } ////// 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 virtual T this[string identity] { get { return (((MetadataCollection)this.Items)[identity]); } } /// /// Returns the metadata collection over which this collection is the view /// internal MetadataCollectionSource { get { return (MetadataCollection )this.Items; } } #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 virtual T GetValue(string identity, bool ignoreCase) { return ((MetadataCollection)this.Items).GetValue(identity, ignoreCase); } /// /// 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 virtual bool Contains(string identity) { return ((MetadataCollection)this.Items).ContainsIdentity(identity); } /// /// 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 virtual bool TryGetValue(string identity, bool ignoreCase, out T item) { return ((MetadataCollection)this.Items).TryGetValue(identity, ignoreCase, out item); } /// /// Gets the enumerator over this collection /// ///public new Enumerator GetEnumerator() { return new Enumerator(this.Items); } /// /// Workaround for bug /// /// ///public new virtual int IndexOf(T value) { return base.IndexOf(value); } #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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