diff options
Diffstat (limited to 'csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs')
| -rw-r--r-- | csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs b/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs new file mode 100644 index 00000000..6ba039c1 --- /dev/null +++ b/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs @@ -0,0 +1,126 @@ +// 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.
+using System;
+using Google.ProtocolBuffers.Descriptors;
+
+namespace Google.ProtocolBuffers.FieldAccess
+{
+ /// <summary>
+ /// Provides access to fields in generated messages via reflection.
+ /// This type is public to allow it to be used by generated messages, which
+ /// create appropriate instances in the .proto file description class.
+ /// TODO(jonskeet): See if we can hide it somewhere...
+ /// </summary>
+ public sealed class FieldAccessorTable<TMessage, TBuilder>
+ where TMessage : IMessage<TMessage, TBuilder>
+ where TBuilder : IBuilder<TMessage, TBuilder>
+ {
+ private readonly IFieldAccessor<TMessage, TBuilder>[] accessors;
+
+ private readonly MessageDescriptor descriptor;
+
+ public MessageDescriptor Descriptor
+ {
+ get { return descriptor; }
+ }
+
+ /// <summary>
+ /// Constructs a FieldAccessorTable for a particular message class.
+ /// Only one FieldAccessorTable should be constructed per class.
+ /// The property names should all actually correspond with the field descriptor's
+ /// CSharpOptions.PropertyName property, but bootstrapping issues currently
+ /// prevent us from using that. This may be addressed at a future time, in which case
+ /// we can keep this constructor for backwards compatibility, just ignoring the parameter.
+ /// TODO(jonskeet): Make it so.
+ /// </summary>
+ /// <param name="descriptor">The type's descriptor</param>
+ /// <param name="propertyNames">The Pascal-case names of all the field-based properties in the message.</param>
+ public FieldAccessorTable(MessageDescriptor descriptor, String[] propertyNames)
+ {
+ this.descriptor = descriptor;
+ accessors = new IFieldAccessor<TMessage, TBuilder>[descriptor.Fields.Count];
+ for (int i = 0; i < accessors.Length; i++)
+ {
+ accessors[i] = CreateAccessor(descriptor.Fields[i], propertyNames[i]);
+ }
+ }
+
+ /// <summary>
+ /// Creates an accessor for a single field
+ /// </summary>
+ private static IFieldAccessor<TMessage, TBuilder> CreateAccessor(FieldDescriptor field, string name)
+ {
+ if (field.IsRepeated)
+ {
+ switch (field.MappedType)
+ {
+ case MappedType.Message:
+ return new RepeatedMessageAccessor<TMessage, TBuilder>(name);
+ case MappedType.Enum:
+ return new RepeatedEnumAccessor<TMessage, TBuilder>(field, name);
+ default:
+ return new RepeatedPrimitiveAccessor<TMessage, TBuilder>(name);
+ }
+ }
+ else
+ {
+ switch (field.MappedType)
+ {
+ case MappedType.Message:
+ return new SingleMessageAccessor<TMessage, TBuilder>(name);
+ case MappedType.Enum:
+ return new SingleEnumAccessor<TMessage, TBuilder>(field, name);
+ default:
+ return new SinglePrimitiveAccessor<TMessage, TBuilder>(name);
+ }
+ }
+ }
+
+ internal IFieldAccessor<TMessage, TBuilder> this[FieldDescriptor field]
+ {
+ get
+ {
+ if (field.ContainingType != descriptor)
+ {
+ throw new ArgumentException("FieldDescriptor does not match message type.");
+ }
+ else if (field.IsExtension)
+ {
+ // If this type had extensions, it would subclass ExtendableMessage,
+ // which overrides the reflection interface to handle extensions.
+ throw new ArgumentException("This type does not have extensions.");
+ }
+ return accessors[field.Index];
+ }
+ }
+ }
+}
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