1 #region Copyright notice and license 2 // Protocol Buffers - Google's data interchange format 3 // Copyright 2008 Google Inc. All rights reserved. 4 // https://developers.google.com/protocol-buffers/ 5 // 6 // Redistribution and use in source and binary forms, with or without 7 // modification, are permitted provided that the following conditions are 8 // met: 9 // 10 // * Redistributions of source code must retain the above copyright 11 // notice, this list of conditions and the following disclaimer. 12 // * Redistributions in binary form must reproduce the above 13 // copyright notice, this list of conditions and the following disclaimer 14 // in the documentation and/or other materials provided with the 15 // distribution. 16 // * Neither the name of Google Inc. nor the names of its 17 // contributors may be used to endorse or promote products derived from 18 // this software without specific prior written permission. 19 // 20 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 23 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 24 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 25 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 26 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 30 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 #endregion 32 33 using System.Collections.Generic; 34 using System.Collections.ObjectModel; 35 36 namespace Google.Protobuf.Reflection 37 { 38 /// <summary> 39 /// Internal class containing utility methods when working with descriptors. 40 /// </summary> 41 internal static class DescriptorUtil 42 { 43 /// <summary> 44 /// Equivalent to Func[TInput, int, TOutput] but usable in .NET 2.0. Only used to convert 45 /// arrays. 46 /// </summary> IndexedConverter(TInput element, int index)47 internal delegate TOutput IndexedConverter<TInput, TOutput>(TInput element, int index); 48 49 /// <summary> 50 /// Converts the given array into a read-only list, applying the specified conversion to 51 /// each input element. 52 /// </summary> ConvertAndMakeReadOnly(IList<TInput> input, IndexedConverter<TInput, TOutput> converter)53 internal static IList<TOutput> ConvertAndMakeReadOnly<TInput, TOutput> 54 (IList<TInput> input, IndexedConverter<TInput, TOutput> converter) 55 { 56 TOutput[] array = new TOutput[input.Count]; 57 for (int i = 0; i < array.Length; i++) 58 { 59 array[i] = converter(input[i], i); 60 } 61 return new ReadOnlyCollection<TOutput>(array); 62 } 63 } 64 }