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