// 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]; | |
} | |
} | |
} | |
} |