diff options
Diffstat (limited to 'csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs')
| -rw-r--r-- | csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs | 98 |
1 files changed, 83 insertions, 15 deletions
diff --git a/csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs b/csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs index b29b4b20..1250774d 100644 --- a/csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs +++ b/csharp/src/Google.Protobuf/Reflection/MessageDescriptor.cs @@ -33,6 +33,7 @@ using Google.Protobuf.Collections; using System; using System.Collections.Generic; +using System.Collections.ObjectModel; using System.Linq; namespace Google.Protobuf.Reflection @@ -60,11 +61,12 @@ namespace Google.Protobuf.Reflection private readonly MessageDescriptor containingType; private readonly IList<MessageDescriptor> nestedTypes; private readonly IList<EnumDescriptor> enumTypes; - private readonly IList<FieldDescriptor> fields; + private readonly IList<FieldDescriptor> fieldsInDeclarationOrder; + private readonly IList<FieldDescriptor> fieldsInNumberOrder; + private readonly FieldCollection fields; private readonly IList<OneofDescriptor> oneofs; // CLR representation of the type described by this descriptor, if any. private readonly Type generatedType; - private IDictionary<int, IFieldAccessor> fieldAccessorsByFieldNumber; internal MessageDescriptor(DescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int typeIndex, GeneratedCodeInfo generatedCodeInfo) : base(file, file.ComputeFullName(parent, proto.Name), typeIndex) @@ -89,11 +91,13 @@ namespace Google.Protobuf.Reflection (type, index) => new EnumDescriptor(type, file, this, index, generatedCodeInfo == null ? null : generatedCodeInfo.NestedEnums[index])); - fields = DescriptorUtil.ConvertAndMakeReadOnly( + fieldsInDeclarationOrder = DescriptorUtil.ConvertAndMakeReadOnly( proto.Field, (field, index) => new FieldDescriptor(field, file, this, index, generatedCodeInfo == null ? null : generatedCodeInfo.PropertyNames[index])); + fieldsInNumberOrder = new ReadOnlyCollection<FieldDescriptor>(fieldsInDeclarationOrder.OrderBy(field => field.FieldNumber).ToArray()); file.DescriptorPool.AddSymbol(this); + fields = new FieldCollection(this); } /// <summary> @@ -136,9 +140,9 @@ namespace Google.Protobuf.Reflection } /// <value> - /// An unmodifiable list of this message type's fields. + /// A collection of fields, which can be retrieved by name or field number. /// </value> - public IList<FieldDescriptor> Fields + public FieldCollection Fields { get { return fields; } } @@ -165,13 +169,6 @@ namespace Google.Protobuf.Reflection } /// <summary> - /// Returns a map from field number to accessor. - /// TODO: Revisit this. It's mostly in place to make the transition from FieldAccessorTable - /// to descriptor-based reflection simple in terms of tests. Work out what we really want. - /// </summary> - public IDictionary<int, IFieldAccessor> FieldAccessorsByFieldNumber { get { return fieldAccessorsByFieldNumber; } } - - /// <summary> /// Finds a field by field name. /// </summary> /// <param name="name">The unqualified name of the field (e.g. "foo").</param> @@ -213,7 +210,7 @@ namespace Google.Protobuf.Reflection message.CrossLink(); } - foreach (FieldDescriptor field in fields) + foreach (FieldDescriptor field in fieldsInDeclarationOrder) { field.CrossLink(); } @@ -222,8 +219,79 @@ namespace Google.Protobuf.Reflection { oneof.CrossLink(); } + } + + /// <summary> + /// A collection to simplify retrieving the field accessor for a particular field. + /// </summary> + public sealed class FieldCollection + { + private readonly MessageDescriptor messageDescriptor; + + internal FieldCollection(MessageDescriptor messageDescriptor) + { + this.messageDescriptor = messageDescriptor; + } - fieldAccessorsByFieldNumber = new ReadOnlyDictionary<int, IFieldAccessor>(fields.ToDictionary(field => field.FieldNumber, field => field.Accessor)); + /// <value> + /// Returns the fields in the message as an immutable list, in the order in which they + /// are declared in the source .proto file. + /// </value> + public IList<FieldDescriptor> InDeclarationOrder() + { + return messageDescriptor.fieldsInDeclarationOrder; + } + + /// <value> + /// Returns the fields in the message as an immutable list, in ascending field number + /// order. Field numbers need not be contiguous, so there is no direct mapping from the + /// index in the list to the field number; to retrieve a field by field number, it is better + /// to use the <see cref="FieldCollection"/> indexer. + /// </value> + public IList<FieldDescriptor> InFieldNumberOrder() + { + return messageDescriptor.fieldsInDeclarationOrder; + } + + /// <summary> + /// Retrieves the descriptor for the field with the given number. + /// </summary> + /// <param name="number">Number of the field to retrieve the descriptor for</param> + /// <returns>The accessor for the given field</returns> + /// <exception cref="KeyNotFoundException">The message descriptor does not contain a field + /// with the given number</exception> + public FieldDescriptor this[int number] + { + get + { + var fieldDescriptor = messageDescriptor.FindFieldByNumber(number); + if (fieldDescriptor == null) + { + throw new KeyNotFoundException("No such field number"); + } + return fieldDescriptor; + } + } + + /// <summary> + /// Retrieves the descriptor for the field with the given name. + /// </summary> + /// <param name="number">Number of the field to retrieve the descriptor for</param> + /// <returns>The descriptor for the given field</returns> + /// <exception cref="KeyNotFoundException">The message descriptor does not contain a field + /// with the given name</exception> + public FieldDescriptor this[string name] + { + get + { + var fieldDescriptor = messageDescriptor.FindFieldByName(name); + if (fieldDescriptor == null) + { + throw new KeyNotFoundException("No such field name"); + } + return fieldDescriptor; + } + } } } -}
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