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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 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.Collections.ObjectModel;
namespace Google.Protobuf.Reflection
{
/// <summary>
/// Provides access to fields in generated messages via reflection.
/// </summary>
public sealed class FieldAccessorTable
{
private readonly ReadOnlyCollection<IFieldAccessor> accessors;
private readonly ReadOnlyCollection<OneofAccessor> oneofs;
private readonly MessageDescriptor descriptor;
/// <summary>
/// Constructs a FieldAccessorTable for a particular message class.
/// Only one FieldAccessorTable should be constructed per class.
/// </summary>
/// <param name="type">The CLR type for the message.</param>
/// <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(Type type, MessageDescriptor descriptor, string[] propertyNames, string[] oneofPropertyNames)
{
this.descriptor = descriptor;
var accessorsArray = new IFieldAccessor[descriptor.Fields.Count];
for (int i = 0; i < accessorsArray.Length; i++)
{
var field = descriptor.Fields[i];
var name = propertyNames[i];
accessorsArray[i] =
field.IsMap ? new MapFieldAccessor(type, name, field)
: field.IsRepeated ? new RepeatedFieldAccessor(type, name, field)
: (IFieldAccessor) new SingleFieldAccessor(type, name, field);
}
accessors = new ReadOnlyCollection<IFieldAccessor>(accessorsArray);
var oneofsArray = new OneofAccessor[descriptor.Oneofs.Count];
for (int i = 0; i < oneofsArray.Length; i++)
{
var oneof = descriptor.Oneofs[i];
oneofsArray[i] = new OneofAccessor(type, oneofPropertyNames[i], oneof);
}
oneofs = new ReadOnlyCollection<OneofAccessor>(oneofsArray);
}
// TODO: Validate the name here... should possibly make this type a more "general reflection access" type,
// bearing in mind the oneof parts to come as well.
/// <summary>
/// Returns all of the field accessors for the message type.
/// </summary>
public ReadOnlyCollection<IFieldAccessor> Accessors { get { return accessors; } }
public ReadOnlyCollection<OneofAccessor> Oneofs { get { return oneofs; } }
// TODO: Review this, as it's easy to get confused between FieldNumber and Index.
// Currently only used to get an accessor related to a oneof... maybe just make that simpler?
public IFieldAccessor this[int fieldNumber]
{
get
{
FieldDescriptor field = descriptor.FindFieldByNumber(fieldNumber);
return accessors[field.Index];
}
}
}
}
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