64 lines
2.8 KiB
C#
64 lines
2.8 KiB
C#
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#region Copyright notice and license
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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// https://developers.google.com/protocol-buffers/
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#endregion
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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namespace LC.Google.Protobuf.Reflection
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{
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/// <summary>
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/// Internal class containing utility methods when working with descriptors.
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/// </summary>
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internal static class DescriptorUtil
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{
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/// <summary>
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/// Equivalent to Func[TInput, int, TOutput] but usable in .NET 2.0. Only used to convert
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/// arrays.
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/// </summary>
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internal delegate TOutput IndexedConverter<TInput, TOutput>(TInput element, int index);
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/// <summary>
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/// Converts the given array into a read-only list, applying the specified conversion to
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/// each input element.
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/// </summary>
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internal static IList<TOutput> ConvertAndMakeReadOnly<TInput, TOutput>
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(IList<TInput> input, IndexedConverter<TInput, TOutput> converter)
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{
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TOutput[] array = new TOutput[input.Count];
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for (int i = 0; i < array.Length; i++)
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{
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array[i] = converter(input[i], i);
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}
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return new ReadOnlyCollection<TOutput>(array);
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}
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}
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}
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