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Diffstat (limited to 'csharp/src/Google.Protobuf/Reflection/FieldAccessorTable.cs')
| -rw-r--r-- | csharp/src/Google.Protobuf/Reflection/FieldAccessorTable.cs | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/csharp/src/Google.Protobuf/Reflection/FieldAccessorTable.cs b/csharp/src/Google.Protobuf/Reflection/FieldAccessorTable.cs new file mode 100644 index 00000000..24fcbc64 --- /dev/null +++ b/csharp/src/Google.Protobuf/Reflection/FieldAccessorTable.cs @@ -0,0 +1,97 @@ +#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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