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author | Jan Tattermusch <jtattermusch@users.noreply.github.com> | 2015-04-17 14:15:52 -0700 |
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committer | Jan Tattermusch <jtattermusch@users.noreply.github.com> | 2015-04-17 14:15:52 -0700 |
commit | 01c8c35ca3d3424a9473dd22ea2456933b3e8d36 (patch) | |
tree | de582cb9ef3e449f24015dec09f80e998806b26a /csharp/src/ProtocolBuffers/MessageUtil.cs | |
parent | 813d6d652d8091e9365bfbd01efb5f2ee8bdfbce (diff) | |
parent | 1eab56aee8dddcb656db67d9fb87a8cc6a2ac112 (diff) | |
download | protobuf-01c8c35ca3d3424a9473dd22ea2456933b3e8d36.tar.gz protobuf-01c8c35ca3d3424a9473dd22ea2456933b3e8d36.tar.bz2 protobuf-01c8c35ca3d3424a9473dd22ea2456933b3e8d36.zip |
Merge pull request #2 from jtattermusch/csharp_protobuf_imported
Pulling protobuf-csharp-port into csharp/ directory
Diffstat (limited to 'csharp/src/ProtocolBuffers/MessageUtil.cs')
-rw-r--r-- | csharp/src/ProtocolBuffers/MessageUtil.cs | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers/MessageUtil.cs b/csharp/src/ProtocolBuffers/MessageUtil.cs new file mode 100644 index 00000000..d120d209 --- /dev/null +++ b/csharp/src/ProtocolBuffers/MessageUtil.cs @@ -0,0 +1,109 @@ +#region Copyright notice and license
+
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc. All rights reserved.
+// http://github.com/jskeet/dotnet-protobufs/
+// Original C++/Java/Python code:
+// http://code.google.com/p/protobuf/
+//
+// 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;
+
+namespace Google.ProtocolBuffers
+{
+ /// <summary>
+ /// Utilities for arbitrary messages of an unknown type. This class does not use
+ /// generics precisely because it is designed for dynamically discovered types.
+ /// </summary>
+ public static class MessageUtil
+ {
+ /// <summary>
+ /// Returns the default message for the given type. If an exception is thrown
+ /// (directly from this code), the message will be suitable to be displayed to a user.
+ /// </summary>
+ /// <param name="type"></param>
+ /// <exception cref="ArgumentNullException">The type parameter is null.</exception>
+ /// <exception cref="ArgumentException">The type doesn't implement IMessage, or doesn't
+ /// have a static DefaultMessage property of the same type, or is generic or abstract.</exception>
+ /// <returns></returns>
+ public static IMessage GetDefaultMessage(Type type)
+ {
+ if (type == null)
+ {
+ throw new ArgumentNullException("type", "No type specified.");
+ }
+ if (type.IsAbstract || type.IsGenericTypeDefinition)
+ {
+ throw new ArgumentException("Unable to get a default message for an abstract or generic type (" +
+ type.FullName + ")");
+ }
+ if (!typeof(IMessage).IsAssignableFrom(type))
+ {
+ throw new ArgumentException("Unable to get a default message for non-message type (" + type.FullName +
+ ")");
+ }
+ PropertyInfo property = type.GetProperty("DefaultInstance",
+ BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic);
+ if (property == null)
+ {
+ throw new ArgumentException(type.FullName + " doesn't have a static DefaultInstance property");
+ }
+ if (property.PropertyType != type)
+ {
+ throw new ArgumentException(type.FullName + ".DefaultInstance property is of the wrong type");
+ }
+ return (IMessage) property.GetValue(null, null);
+ }
+
+ /// <summary>
+ /// Returns the default message for the type with the given name. This is just
+ /// a convenience wrapper around calling Type.GetType and then GetDefaultMessage.
+ /// If an exception is thrown, the message will be suitable to be displayed to a user.
+ /// </summary>
+ /// <param name="typeName"></param>
+ /// <exception cref="ArgumentNullException">The typeName parameter is null.</exception>
+ /// <exception cref="ArgumentException">The type doesn't implement IMessage, or doesn't
+ /// have a static DefaultMessage property of the same type, or can't be found.</exception>
+ public static IMessage GetDefaultMessage(string typeName)
+ {
+ if (typeName == null)
+ {
+ throw new ArgumentNullException("typeName", "No type name specified.");
+ }
+ Type type = Type.GetType(typeName);
+ if (type == null)
+ {
+ throw new ArgumentException("Unable to load type " + typeName);
+ }
+ return GetDefaultMessage(type);
+ }
+ }
+}
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