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@ -122,10 +122,14 @@ namespace Google.Protobuf |
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{ |
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Preconditions.CheckNotNull(message, "message"); |
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StringBuilder builder = new StringBuilder(); |
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// TODO(jonskeet): Handle well-known types here. |
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// Our reflection support needs improving so that we can get at the descriptor |
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// to find out whether *this* message is a well-known type. |
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if (message.Descriptor.IsWellKnownType) |
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{ |
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WriteWellKnownTypeValue(builder, message.Descriptor, message, false); |
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} |
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else |
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{ |
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WriteMessage(builder, message); |
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} |
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return builder.ToString(); |
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} |
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@ -356,7 +360,7 @@ namespace Google.Protobuf |
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case FieldType.Group: // Never expect to get this, but... |
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if (descriptor.MessageType.IsWellKnownType) |
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{ |
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WriteWellKnownTypeValue(builder, descriptor, value); |
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WriteWellKnownTypeValue(builder, descriptor.MessageType, value, true); |
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} |
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else |
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{ |
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@ -370,20 +374,115 @@ namespace Google.Protobuf |
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/// <summary> |
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/// Central interception point for well-known type formatting. Any well-known types which |
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/// don't need special handling can fall back to WriteMessage. |
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/// don't need special handling can fall back to WriteMessage. We avoid assuming that the |
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/// values are using the embedded well-known types, in order to allow for dynamic messages |
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/// in the future. |
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/// </summary> |
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private void WriteWellKnownTypeValue(StringBuilder builder, FieldDescriptor descriptor, object value) |
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private void WriteWellKnownTypeValue(StringBuilder builder, MessageDescriptor descriptor, object value, bool inField) |
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{ |
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// For wrapper types, the value will be the (possibly boxed) "native" value, |
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// so we can write it as if we were unconditionally writing the Value field for the wrapper type. |
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if (descriptor.MessageType.File == Int32Value.Descriptor.File && value != null) |
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if (descriptor.File == Int32Value.Descriptor.File && value != null) |
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{ |
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WriteSingleValue(builder, descriptor.FindFieldByNumber(1), value); |
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return; |
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} |
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if (descriptor.FullName == Timestamp.Descriptor.FullName && value != null) |
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{ |
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MaybeWrapInString(builder, value, WriteTimestamp, inField); |
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return; |
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} |
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if (descriptor.FullName == Duration.Descriptor.FullName && value != null) |
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{ |
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WriteSingleValue(builder, descriptor.MessageType.FindFieldByNumber(1), value); |
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MaybeWrapInString(builder, value, WriteDuration, inField); |
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return; |
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} |
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WriteMessage(builder, (IMessage) value); |
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} |
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/// <summary> |
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/// Some well-known types end up as string values... so they need wrapping in quotes, but only |
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/// when they're being used as fields within another message. |
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/// </summary> |
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private void MaybeWrapInString(StringBuilder builder, object value, Action<StringBuilder, IMessage> action, bool inField) |
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{ |
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if (inField) |
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{ |
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builder.Append('"'); |
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action(builder, (IMessage) value); |
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builder.Append('"'); |
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} |
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else |
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{ |
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action(builder, (IMessage) value); |
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} |
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} |
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private void WriteTimestamp(StringBuilder builder, IMessage value) |
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{ |
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// TODO: In the common case where this *is* using the built-in Timestamp type, we could |
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// avoid all the reflection at this point, by casting to Timestamp. In the interests of |
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// avoiding subtle bugs, don't do that until we've implemented DynamicMessage so that we can prove |
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// it still works in that case. |
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int nanos = (int) value.Descriptor.Fields[Timestamp.NanosFieldNumber].Accessor.GetValue(value); |
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long seconds = (long) value.Descriptor.Fields[Timestamp.SecondsFieldNumber].Accessor.GetValue(value); |
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// Even if the original message isn't using the built-in classes, we can still build one... and then |
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// rely on it being normalized. |
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Timestamp normalized = Timestamp.Normalize(seconds, nanos); |
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// Use .NET's formatting for the value down to the second, including an opening double quote (as it's a string value) |
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DateTime dateTime = normalized.ToDateTime(); |
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builder.Append(dateTime.ToString("yyyy'-'MM'-'dd'T'HH:mm:ss", CultureInfo.InvariantCulture)); |
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AppendNanoseconds(builder, Math.Abs(normalized.Nanos)); |
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builder.Append('Z'); |
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} |
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private void WriteDuration(StringBuilder builder, IMessage value) |
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{ |
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// TODO: Same as for WriteTimestamp |
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int nanos = (int) value.Descriptor.Fields[Duration.NanosFieldNumber].Accessor.GetValue(value); |
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long seconds = (long) value.Descriptor.Fields[Duration.SecondsFieldNumber].Accessor.GetValue(value); |
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// Even if the original message isn't using the built-in classes, we can still build one... and then |
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// rely on it being normalized. |
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Duration normalized = Duration.Normalize(seconds, nanos); |
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// The seconds part will normally provide the minus sign if we need it, but not if it's 0... |
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if (normalized.Seconds == 0 && normalized.Nanos < 0) |
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{ |
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builder.Append('-'); |
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} |
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builder.Append(normalized.Seconds.ToString("d", CultureInfo.InvariantCulture)); |
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AppendNanoseconds(builder, Math.Abs(normalized.Nanos)); |
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builder.Append('s'); |
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} |
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/// <summary> |
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/// Appends a number of nanoseconds to a StringBuilder. Either 0 digits are added (in which |
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/// case no "." is appended), or 3 6 or 9 digits. |
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/// </summary> |
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private static void AppendNanoseconds(StringBuilder builder, int nanos) |
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{ |
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if (nanos != 0) |
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{ |
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builder.Append('.'); |
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// Output to 3, 6 or 9 digits. |
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if (nanos % 1000000 == 0) |
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{ |
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builder.Append((nanos / 1000000).ToString("d", CultureInfo.InvariantCulture)); |
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} |
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else if (nanos % 1000 == 0) |
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{ |
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builder.Append((nanos / 1000).ToString("d", CultureInfo.InvariantCulture)); |
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} |
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else |
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{ |
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builder.Append(nanos.ToString("d", CultureInfo.InvariantCulture)); |
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} |
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} |
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} |
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private void WriteList(StringBuilder builder, IFieldAccessor accessor, IList list) |
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{ |
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builder.Append("[ "); |
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Jon Skeet
9 years ago