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Diffstat (limited to 'csharp/src/Google.Protobuf/Reflection/OneofDescriptor.cs')
-rw-r--r-- | csharp/src/Google.Protobuf/Reflection/OneofDescriptor.cs | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/csharp/src/Google.Protobuf/Reflection/OneofDescriptor.cs b/csharp/src/Google.Protobuf/Reflection/OneofDescriptor.cs new file mode 100644 index 00000000..d51ee526 --- /dev/null +++ b/csharp/src/Google.Protobuf/Reflection/OneofDescriptor.cs @@ -0,0 +1,127 @@ +#region Copyright notice and license +// Protocol Buffers - Google's data interchange format +// Copyright 2015 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; +using Google.Protobuf.Compatibility; + +namespace Google.Protobuf.Reflection +{ + /// <summary> + /// Describes a "oneof" field collection in a message type: a set of + /// fields of which at most one can be set in any particular message. + /// </summary> + public sealed class OneofDescriptor : DescriptorBase + { + private readonly OneofDescriptorProto proto; + private MessageDescriptor containingType; + private IList<FieldDescriptor> fields; + private readonly OneofAccessor accessor; + + internal OneofDescriptor(OneofDescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int index, string clrName) + : base(file, file.ComputeFullName(parent, proto.Name), index) + { + this.proto = proto; + containingType = parent; + + file.DescriptorPool.AddSymbol(this); + accessor = CreateAccessor(clrName); + } + + /// <summary> + /// The brief name of the descriptor's target. + /// </summary> + public override string Name { get { return proto.Name; } } + + /// <summary> + /// Gets the message type containing this oneof. + /// </summary> + /// <value> + /// The message type containing this oneof. + /// </value> + public MessageDescriptor ContainingType + { + get { return containingType; } + } + + /// <summary> + /// Gets the fields within this oneof, in declaration order. + /// </summary> + /// <value> + /// The fields within this oneof, in declaration order. + /// </value> + public IList<FieldDescriptor> Fields { get { return fields; } } + + /// <summary> + /// Gets an accessor for reflective access to the values associated with the oneof + /// in a particular message. + /// </summary> + /// <value> + /// The accessor used for reflective access, or <c>null</c> if reflection is not + /// supported by this descriptor. + /// </value> + public OneofAccessor Accessor { get { return accessor; } } + + internal void CrossLink() + { + List<FieldDescriptor> fieldCollection = new List<FieldDescriptor>(); + foreach (var field in ContainingType.Fields.InDeclarationOrder()) + { + if (field.ContainingOneof == this) + { + fieldCollection.Add(field); + } + } + fields = new ReadOnlyCollection<FieldDescriptor>(fieldCollection); + } + + private OneofAccessor CreateAccessor(string clrName) + { + if (containingType.GeneratedType == null || clrName == null) + { + return null; + } + var caseProperty = containingType.GeneratedType.GetProperty(clrName + "Case"); + if (caseProperty == null) + { + throw new DescriptorValidationException(this, "Property " + clrName + "Case not found in " + containingType.GeneratedType); + } + var clearMethod = containingType.GeneratedType.GetMethod("Clear" + clrName); + if (clearMethod == null) + { + throw new DescriptorValidationException(this, "Method Clear" + clrName + " not found in " + containingType.GeneratedType); + } + + return new OneofAccessor(caseProperty, clearMethod, this); + } + } +} |