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//---------------------------------------------------------------------
// <copyright file="ReadOnlyMetadataCollection.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//
// @owner Microsoft
// @backupOwner Microsoft
//---------------------------------------------------------------------
using System.Collections;
using System.Collections.Generic;
namespace System.Data.Metadata.Edm
{
/// <summary>
/// Class representing a read-only wrapper around MetadataCollection
/// </summary>
/// <typeparam name="T">The type of items in this collection</typeparam>
public class ReadOnlyMetadataCollection<T> : System.Collections.ObjectModel.ReadOnlyCollection<T> where T : MetadataItem
{
#region Constructors
/// <summary>
/// The constructor for constructing a read-only metadata collection to wrap another MetadataCollection.
/// </summary>
/// <param name="collection">The metadata collection to wrap</param>
/// <exception cref="System.ArgumentNullException">Thrown if collection argument is null</exception>
internal ReadOnlyMetadataCollection(IList<T> collection) : base(collection)
{
}
#endregion
#region InnerClasses
// On the surface, this Enumerator doesn't do anything but delegating to the underlying enumerator
/// <summary>
/// The enumerator for MetadataCollection
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Performance", "CA1815:OverrideEqualsAndOperatorEqualsOnValueTypes")]
public struct Enumerator : IEnumerator<T>
{
/// <summary>
/// Constructor for the enumerator
/// </summary>
/// <param name="collection">The collection that this enumerator should enumerate on</param>
internal Enumerator(IList<T> collection)
{
_parent = collection;
_nextIndex = 0;
_current = null;
}
private int _nextIndex;
private IList<T> _parent;
private T _current;
/// <summary>
/// Gets the member at the current position
/// </summary>
public T Current
{
get
{
return _current;
}
}
/// <summary>
/// Gets the member at the current position
/// </summary>
object IEnumerator.Current
{
get
{
return this.Current;
}
}
/// <summary>
/// Dispose this enumerator
/// </summary>
public void Dispose()
{
}
/// <summary>
/// Move to the next member in the collection
/// </summary>
/// <returns>True if the enumerator is moved</returns>
public bool MoveNext()
{
if ((uint)_nextIndex < (uint)_parent.Count)
{
_current = _parent[_nextIndex];
_nextIndex++;
return true;
}
_current = null;
return false;
}
/// <summary>
/// Sets the enumerator to the initial position before the first member
/// </summary>
public void Reset()
{
_current = null;
_nextIndex = 0;
}
}
#endregion
#region Properties
/// <summary>
/// Gets whether the collection is a readonly collection
/// </summary>
public bool IsReadOnly
{
get
{
return true;
}
}
/// <summary>
/// Gets an item from the collection with the given identity
/// </summary>
/// <param name="identity">The identity of the item to search for</param>
/// <returns>An item from the collection</returns>
/// <exception cref="System.ArgumentNullException">Thrown if identity argument passed in is null</exception>
/// <exception cref="System.NotSupportedException">Thrown if setter is called</exception>
public virtual T this[string identity]
{
get
{
return (((MetadataCollection<T>)this.Items)[identity]);
}
}
/// <summary>
/// Returns the metadata collection over which this collection is the view
/// </summary>
internal MetadataCollection<T> Source
{
get
{
return (MetadataCollection<T>)this.Items;
}
}
#endregion
#region Methods
/// <summary>
/// Gets an item from the collection with the given identity
/// </summary>
/// <param name="identity">The identity of the item to search for</param>
/// <param name="ignoreCase">Whether case is ignore in the search</param>
/// <returns>An item from the collection</returns>
/// <exception cref="System.ArgumentNullException">Thrown if identity argument passed in is null</exception>
/// <exception cref="System.ArgumentException">Thrown if the Collection does not have an item with the given identity</exception>
public virtual T GetValue(string identity, bool ignoreCase)
{
return ((MetadataCollection<T>)this.Items).GetValue(identity, ignoreCase);
}
/// <summary>
/// Determines if this collection contains an item of the given identity
/// </summary>
/// <param name="identity">The identity of the item to check for</param>
/// <returns>True if the collection contains the item with the given identity</returns>
/// <exception cref="System.ArgumentNullException">Thrown if identity argument passed in is null</exception>
/// <exception cref="System.ArgumentException">Thrown if identity argument passed in is empty string</exception>
public virtual bool Contains(string identity)
{
return ((MetadataCollection<T>)this.Items).ContainsIdentity(identity);
}
/// <summary>
/// Gets an item from the collection with the given identity
/// </summary>
/// <param name="identity">The identity of the item to search for</param>
/// <param name="ignoreCase">Whether case is ignored in the search</param>
/// <param name="item">An item from the collection, null if the item is not found</param>
/// <returns>True an item is retrieved</returns>
/// <exception cref="System.ArgumentNullException">if identity argument is null</exception>
public virtual bool TryGetValue(string identity, bool ignoreCase, out T item)
{
return ((MetadataCollection<T>)this.Items).TryGetValue(identity, ignoreCase, out item);
}
/// <summary>
/// Gets the enumerator over this collection
/// </summary>
/// <returns></returns>
public new Enumerator GetEnumerator()
{
return new Enumerator(this.Items);
}
/// <summary>
/// Workaround for bug
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public new virtual int IndexOf(T value)
{
return base.IndexOf(value);
}
#endregion
}
}
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