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using System.Collections.Generic;
using Google.ProtocolBuffers.DescriptorProtos;
namespace Google.ProtocolBuffers.Descriptors {
/// <summary>
/// Describes a message type.
/// </summary>
public class MessageDescriptor : IndexedDescriptorBase<DescriptorProto, MessageOptions> {
private readonly MessageDescriptor containingType;
private readonly IList<MessageDescriptor> nestedTypes;
private readonly IList<EnumDescriptor> enumTypes;
private readonly IList<FieldDescriptor> fields;
private readonly IList<FieldDescriptor> extensions;
internal MessageDescriptor(DescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int typeIndex)
: base(proto, file, ComputeFullName(file, parent, proto.Name), typeIndex) {
containingType = parent;
nestedTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.NestedTypeList,
(type, index) => new MessageDescriptor(type, file, this, index));
enumTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.EnumTypeList,
(type, index) => new EnumDescriptor(type, file, this, index));
fields = DescriptorUtil.ConvertAndMakeReadOnly(proto.FieldList,
(field, index) => new FieldDescriptor(field, file, this, index, false));
extensions = DescriptorUtil.ConvertAndMakeReadOnly(proto.ExtensionList,
(field, index) => new FieldDescriptor(field, file, this, index, true));
file.DescriptorPool.AddSymbol(this);
}
/// <value>
/// If this is a nested type, get the outer descriptor, otherwise null.
/// </value>
public MessageDescriptor ContainingType {
get { return containingType; }
}
/// <value>
/// An unmodifiable list of this message type's fields.
/// </value>
public IList<FieldDescriptor> Fields {
get { return fields; }
}
/// <value>
/// An unmodifiable list of this message type's extensions.
/// </value>
public IList<FieldDescriptor> Extensions {
get { return extensions; }
}
/// <value>
/// An unmodifiable list of this message type's nested types.
/// </value>
public IList<MessageDescriptor> NestedTypes {
get { return nestedTypes; }
}
/// <value>
/// An unmodifiable list of this message type's enum types.
/// </value>
public IList<EnumDescriptor> EnumTypes {
get { return enumTypes; }
}
/// <summary>
/// Determines if the given field number is an extension.
/// </summary>
public bool IsExtensionNumber(int number) {
foreach (DescriptorProto.Types.ExtensionRange range in Proto.ExtensionRangeList) {
if (range.Start <= number && number < range.End) {
return true;
}
}
return false;
}
/// <summary>
/// Finds a field by field number.
/// </summary>
/// <param name="number">The field number within this message type.</param>
/// <returns>The field's descriptor, or null if not found.</returns>
public FieldDescriptor FindFieldByNumber(int number) {
return File.DescriptorPool.FindFieldByNumber(this, number);
}
/// <summary>
/// Finds a nested descriptor by name. The is valid for fields, nested
/// message types and enums.
/// </summary>
/// <param name="name">The unqualified name of the descriptor, e.g. "Foo"</param>
/// <returns>The descriptor, or null if not found.</returns>
public T FindDescriptor<T>(string name)
where T : class, IDescriptor {
return File.DescriptorPool.FindSymbol<T>(FullName + "." + name);
}
/// <summary>
/// Looks up and cross-links all fields, nested types, and extensions.
/// </summary>
internal void CrossLink() {
foreach (MessageDescriptor message in nestedTypes) {
message.CrossLink();
}
foreach (FieldDescriptor field in fields) {
field.CrossLink();
}
foreach (FieldDescriptor extension in extensions) {
extension.CrossLink();
}
}
}
}
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