86 lines
2.9 KiB
C#
86 lines
2.9 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved.
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// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
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using System;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq;
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using System.Threading.Tasks;
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namespace Microsoft.AspNet.Mvc.ModelBinding
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{
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[SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix", Justification = "It is more fundamentally a value provider than a collection")]
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public class CompositeValueProvider : Collection<IValueProvider>, IEnumerableValueProvider
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{
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public CompositeValueProvider()
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: base()
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{
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}
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public CompositeValueProvider(IEnumerable<IValueProvider> valueProviders)
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: base(valueProviders.ToList())
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{
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}
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public virtual async Task<bool> ContainsPrefixAsync(string prefix)
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{
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for (var i = 0; i < Count; i++)
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{
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if (await this[i].ContainsPrefixAsync(prefix))
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{
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return true;
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}
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}
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return false;
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}
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public virtual async Task<ValueProviderResult> GetValueAsync(string key)
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{
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// Performance-sensitive
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// Caching the count is faster for IList<T>
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var itemCount = Items.Count;
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for (var i = 0; i < itemCount; i++)
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{
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var valueProvider = Items[i];
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var result = await valueProvider.GetValueAsync(key);
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if (result != null)
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{
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return result;
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}
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}
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return null;
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}
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public virtual async Task<IDictionary<string, string>> GetKeysFromPrefixAsync(string prefix)
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{
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foreach (var valueProvider in this)
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{
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var result = await GetKeysFromPrefixFromProvider(valueProvider, prefix);
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if (result != null && result.Count > 0)
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{
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return result;
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}
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}
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return new Dictionary<string, string>(StringComparer.OrdinalIgnoreCase);
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}
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private static Task<IDictionary<string, string>> GetKeysFromPrefixFromProvider(IValueProvider provider,
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string prefix)
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{
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var enumeratedProvider = provider as IEnumerableValueProvider;
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return (enumeratedProvider != null) ? enumeratedProvider.GetKeysFromPrefixAsync(prefix) : null;
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}
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protected override void InsertItem(int index, [NotNull] IValueProvider item)
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{
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base.InsertItem(index, item);
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}
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protected override void SetItem(int index, [NotNull] IValueProvider item)
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{
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base.SetItem(index, item);
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}
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}
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}
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