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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
namespace System.Web.Mvc
{
public class ValueProviderCollection : Collection<IValueProvider>, IValueProvider, IUnvalidatedValueProvider, IEnumerableValueProvider
{
public ValueProviderCollection()
{
}
public ValueProviderCollection(IList<IValueProvider> list)
: base(list)
{
}
public virtual bool ContainsPrefix(string prefix)
{
return this.Any(vp => vp.ContainsPrefix(prefix));
}
public virtual ValueProviderResult GetValue(string key)
{
return GetValue(key, skipValidation: false);
}
public virtual ValueProviderResult GetValue(string key, bool skipValidation)
{
return (from provider in this
let result = GetValueFromProvider(provider, key, skipValidation)
where result != null
select result).FirstOrDefault();
}
public virtual IDictionary<string, string> GetKeysFromPrefix(string prefix)
{
return (from provider in this
let result = GetKeysFromPrefixFromProvider(provider, prefix)
where result != null && result.Any()
select result).FirstOrDefault() ?? new Dictionary<string, string>();
}
internal static ValueProviderResult GetValueFromProvider(IValueProvider provider, string key, bool skipValidation)
{
// Since IUnvalidatedValueProvider is a superset of IValueProvider, it's always OK to use the
// IUnvalidatedValueProvider-supplied members if they're present. Otherwise just call the
// normal IValueProvider members.
IUnvalidatedValueProvider unvalidatedProvider = provider as IUnvalidatedValueProvider;
return (unvalidatedProvider != null) ? unvalidatedProvider.GetValue(key, skipValidation) : provider.GetValue(key);
}
internal static IDictionary<string, string> GetKeysFromPrefixFromProvider(IValueProvider provider, string prefix)
{
IEnumerableValueProvider enumeratedProvider = provider as IEnumerableValueProvider;
return (enumeratedProvider != null) ? enumeratedProvider.GetKeysFromPrefix(prefix) : null;
}
protected override void InsertItem(int index, IValueProvider item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
base.InsertItem(index, item);
}
protected override void SetItem(int index, IValueProvider item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
base.SetItem(index, item);
}
}
}
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