1 #region Copyright notice and license 2 // Protocol Buffers - Google's data interchange format 3 // Copyright 2015 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 using Google.Protobuf.Compatibility; 36 37 namespace Google.Protobuf.Reflection 38 { 39 /// <summary> 40 /// Describes a "oneof" field collection in a message type: a set of 41 /// fields of which at most one can be set in any particular message. 42 /// </summary> 43 public sealed class OneofDescriptor : DescriptorBase 44 { 45 private readonly OneofDescriptorProto proto; 46 private MessageDescriptor containingType; 47 private IList<FieldDescriptor> fields; 48 private readonly OneofAccessor accessor; 49 OneofDescriptor(OneofDescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int index, string clrName)50 internal OneofDescriptor(OneofDescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int index, string clrName) 51 : base(file, file.ComputeFullName(parent, proto.Name), index) 52 { 53 this.proto = proto; 54 containingType = parent; 55 56 file.DescriptorPool.AddSymbol(this); 57 accessor = CreateAccessor(clrName); 58 } 59 60 /// <summary> 61 /// The brief name of the descriptor's target. 62 /// </summary> 63 public override string Name { get { return proto.Name; } } 64 65 /// <summary> 66 /// Gets the message type containing this oneof. 67 /// </summary> 68 /// <value> 69 /// The message type containing this oneof. 70 /// </value> 71 public MessageDescriptor ContainingType 72 { 73 get { return containingType; } 74 } 75 76 /// <summary> 77 /// Gets the fields within this oneof, in declaration order. 78 /// </summary> 79 /// <value> 80 /// The fields within this oneof, in declaration order. 81 /// </value> 82 public IList<FieldDescriptor> Fields { get { return fields; } } 83 84 /// <summary> 85 /// Gets an accessor for reflective access to the values associated with the oneof 86 /// in a particular message. 87 /// </summary> 88 /// <value> 89 /// The accessor used for reflective access. 90 /// </value> 91 public OneofAccessor Accessor { get { return accessor; } } 92 CrossLink()93 internal void CrossLink() 94 { 95 List<FieldDescriptor> fieldCollection = new List<FieldDescriptor>(); 96 foreach (var field in ContainingType.Fields.InDeclarationOrder()) 97 { 98 if (field.ContainingOneof == this) 99 { 100 fieldCollection.Add(field); 101 } 102 } 103 fields = new ReadOnlyCollection<FieldDescriptor>(fieldCollection); 104 } 105 CreateAccessor(string clrName)106 private OneofAccessor CreateAccessor(string clrName) 107 { 108 var caseProperty = containingType.ClrType.GetProperty(clrName + "Case"); 109 if (caseProperty == null) 110 { 111 throw new DescriptorValidationException(this, $"Property {clrName}Case not found in {containingType.ClrType}"); 112 } 113 var clearMethod = containingType.ClrType.GetMethod("Clear" + clrName); 114 if (clearMethod == null) 115 { 116 throw new DescriptorValidationException(this, $"Method Clear{clrName} not found in {containingType.ClrType}"); 117 } 118 119 return new OneofAccessor(caseProperty, clearMethod, this); 120 } 121 } 122 } 123