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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 class FieldAccessorTable {
readonly IFieldAccessor[] accessors;
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.
/// </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>
/// <param name="messageType">The .NET type representing the message</param>
/// <param name="builderType">The .NET type representing the message's builder type</param>
public FieldAccessorTable(MessageDescriptor descriptor, String[] propertyNames, Type messageType, Type builderType) {
this.descriptor = descriptor;
accessors = new IFieldAccessor[descriptor.Fields.Count];
for (int i=0; i < accessors.Length; i++) {
accessors[i] = CreateAccessor(descriptor.Fields[i], propertyNames[i], messageType, builderType);
}
}
/// <summary>
/// Creates an accessor for a single field
/// </summary>
private static IFieldAccessor CreateAccessor(FieldDescriptor field, string name, Type messageType, Type builderType) {
if (field.IsRepeated) {
switch (field.MappedType) {
case MappedType.Message: return new RepeatedMessageAccessor(name, messageType, builderType);
case MappedType.Enum: return new RepeatedEnumAccessor(field, name, messageType, builderType);
default: return new RepeatedPrimitiveAccessor(name, messageType, builderType);
}
} else {
switch (field.MappedType) {
case MappedType.Message: return new SingleMessageAccessor(name, messageType, builderType);
case MappedType.Enum: return new SingleEnumAccessor(field, name, messageType, builderType);
default: return new SinglePrimitiveAccessor(name, messageType, builderType);
}
}
}
internal IFieldAccessor 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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