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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
namespace System.IO.Packaging
{
/// <summary>
/// This class is used to get an enumerator for the Parts in a container.
/// This is a part of the MMCF Packaging Layer APIs
/// </summary>
public class PackagePartCollection : IEnumerable<PackagePart>
{
#region Public Methods
/// <summary>
/// Returns an enumerator over all the Parts in the container
/// </summary>
/// <returns></returns>
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
/// <summary>
/// Returns an enumerator over all the Parts in the container
/// </summary>
/// <returns></returns>
IEnumerator<PackagePart> IEnumerable<PackagePart>.GetEnumerator()
{
return GetEnumerator();
}
/// <summary>
/// Returns an enumerator over all the Parts in the Container
/// </summary>
/// <returns></returns>
public IEnumerator<PackagePart> GetEnumerator()
{
//The Dictionary.Values property always returns a collection, even if empty. It never returns a null.
return _partList.Values.GetEnumerator();
}
#endregion Public Methods
#region Internal Constructor
internal PackagePartCollection(SortedList<PackUriHelper.ValidatedPartUri, PackagePart> partList)
{
Debug.Assert(partList != null, "partDictionary parameter cannot be null");
_partList = partList;
}
#endregion Internal Constructor
#region Private Members
private readonly SortedList<PackUriHelper.ValidatedPartUri, PackagePart> _partList;
#endregion Private Members
}
}
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