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Diffstat (limited to 'csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs')
-rw-r--r-- | csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs b/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs new file mode 100644 index 00000000..8714ab18 --- /dev/null +++ b/csharp/src/Google.Protobuf/Reflection/OneofAccessor.cs @@ -0,0 +1,90 @@ +#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; +using System.Reflection; +using Google.Protobuf.Compatibility; + +namespace Google.Protobuf.Reflection +{ + /// <summary> + /// Reflection access for a oneof, allowing clear and "get case" actions. + /// </summary> + public sealed class OneofAccessor + { + private readonly Func<IMessage, int> caseDelegate; + private readonly Action<IMessage> clearDelegate; + private OneofDescriptor descriptor; + + internal OneofAccessor(PropertyInfo caseProperty, MethodInfo clearMethod, OneofDescriptor descriptor) + { + if (!caseProperty.CanRead) + { + throw new ArgumentException("Cannot read from property"); + } + this.descriptor = descriptor; + caseDelegate = ReflectionUtil.CreateFuncIMessageT<int>(caseProperty.GetGetMethod()); + + this.descriptor = descriptor; + clearDelegate = ReflectionUtil.CreateActionIMessage(clearMethod); + } + + /// <summary> + /// Gets the descriptor for this oneof. + /// </summary> + /// <value> + /// The descriptor of the oneof. + /// </value> + public OneofDescriptor Descriptor { get { return descriptor; } } + + /// <summary> + /// Clears the oneof in the specified message. + /// </summary> + public void Clear(IMessage message) + { + clearDelegate(message); + } + + /// <summary> + /// Indicates which field in the oneof is set for specified message + /// </summary> + public FieldDescriptor GetCaseFieldDescriptor(IMessage message) + { + int fieldNumber = caseDelegate(message); + if (fieldNumber > 0) + { + return descriptor.ContainingType.FindFieldByNumber(fieldNumber); + } + return null; + } + } +} |