public static object ConvertToClrType(this Value wireValue, V1.Type spannerType, System.Type targetClrType)
{
if (wireValue.KindCase == Value.KindOneofCase.NullValue)
{
if (targetClrType.GetTypeInfo().IsValueType)
{
//Returns default(T) for targetClrType
return(Activator.CreateInstance(targetClrType));
}
return(null);
}
if (targetClrType == typeof(object))
{
//then we decide the type for you
targetClrType = spannerType?.Code.GetDefaultClrTypeFromSpannerType();
}
var possibleUnderlyingType = Nullable.GetUnderlyingType(targetClrType);
if (possibleUnderlyingType != null)
{
targetClrType = possibleUnderlyingType;
}
//extra supported conversions that are modifications of the "core" versions but may have loss of precision.
//we call the spannerType with the known supported version and cast it down to lose precision.
if (targetClrType == typeof(int))
{
return(Convert.ToInt32((long)ConvertToClrTypeImpl(wireValue, spannerType, typeof(long))));
}
if (targetClrType == typeof(uint))
{
return(Convert.ToUInt32((long)ConvertToClrTypeImpl(wireValue, spannerType, typeof(long))));
}
if (targetClrType == typeof(short))
{
return(Convert.ToInt16((long)ConvertToClrTypeImpl(wireValue, spannerType, typeof(long))));
}
if (targetClrType == typeof(ushort))
{
return(Convert.ToUInt16((long)ConvertToClrTypeImpl(wireValue, spannerType, typeof(long))));
}
if (targetClrType == typeof(char))
{
return(Convert.ToChar((long)ConvertToClrTypeImpl(wireValue, spannerType, typeof(long))));
}
if (targetClrType == typeof(byte))
{
return(Convert.ToByte((long)ConvertToClrTypeImpl(wireValue, spannerType, typeof(long))));
}
if (targetClrType == typeof(decimal))
{
return(Convert.ToDecimal((long)ConvertToClrTypeImpl(wireValue, spannerType, typeof(decimal))));
}
if (targetClrType == typeof(float))
{
return(Convert.ToSingle((double)ConvertToClrTypeImpl(wireValue, spannerType, typeof(double))));
}
if (targetClrType == typeof(Guid))
{
return(Guid.Parse((string)ConvertToClrTypeImpl(wireValue, spannerType, typeof(string))));
}
return(ConvertToClrTypeImpl(wireValue, spannerType, targetClrType));
}
public static T ConvertToClrType <T>(
this Value wireValue,
V1.Type spannerType) => (T)ConvertToClrType(wireValue, spannerType, typeof(T));
private static object ConvertToClrTypeImpl(Value wireValue, V1.Type spannerType, System.Type targetClrType)
{
//If the wireValue itself is assignable to the target type, just return it
//This covers both typeof(Value) and typeof(object).
if (wireValue == null || targetClrType == null || targetClrType == typeof(Value))
{
return(wireValue);
}
//targetClrType should be one of the values returned by GetDefaultClrTypeFromSpannerType
if (targetClrType == typeof(bool))
{
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NullValue:
return(default(bool));
case Value.KindOneofCase.StringValue:
return(Convert.ToBoolean(wireValue.StringValue));
case Value.KindOneofCase.BoolValue:
return(wireValue.BoolValue);
default:
throw new InvalidOperationException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
}
if (targetClrType == typeof(long))
{
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NumberValue:
return(Convert.ToInt64(wireValue.NumberValue));
case Value.KindOneofCase.NullValue:
return(default(long));
case Value.KindOneofCase.StringValue:
return(Convert.ToInt64(wireValue.StringValue));
default:
throw new InvalidOperationException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
}
if (targetClrType == typeof(double))
{
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NullValue:
return(default(double));
case Value.KindOneofCase.NumberValue:
return(wireValue.NumberValue);
case Value.KindOneofCase.StringValue:
if (string.Compare(wireValue.StringValue, "NaN", StringComparison.OrdinalIgnoreCase) == 0)
{
return(double.NaN);
}
if (string.Compare(wireValue.StringValue, "Infinity", StringComparison.OrdinalIgnoreCase) == 0)
{
return(double.PositiveInfinity);
}
if (string.Compare(wireValue.StringValue, "-Infinity", StringComparison.OrdinalIgnoreCase) == 0)
{
return(double.NegativeInfinity);
}
return(Convert.ToDouble(wireValue.StringValue));
default:
throw new InvalidOperationException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
}
if (targetClrType == typeof(DateTime))
{
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NullValue:
return(null);
case Value.KindOneofCase.StringValue:
return(XmlConvert.ToDateTime(wireValue.StringValue, XmlDateTimeSerializationMode.Utc));
default:
throw new InvalidOperationException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
}
if (targetClrType == typeof(Timestamp))
{
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NullValue:
return(null);
case Value.KindOneofCase.StringValue:
return(Timestamp.Parser.ParseJson(wireValue.StringValue));
default:
throw new InvalidOperationException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
}
if (targetClrType == typeof(string))
{
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NullValue:
return(null);
case Value.KindOneofCase.NumberValue:
return(wireValue.NumberValue.ToString(CultureInfo.CurrentCulture));
case Value.KindOneofCase.StringValue:
return(wireValue.StringValue);
case Value.KindOneofCase.BoolValue:
return(wireValue.BoolValue.ToString());
default:
return(wireValue.ToString());
}
}
if (targetClrType == typeof(byte[]))
{
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NullValue:
return(null);
case Value.KindOneofCase.StringValue:
return(Convert.FromBase64String(wireValue.StringValue));
default:
throw new ArgumentOutOfRangeException();
}
}
if (typeof(IDictionary).IsAssignableFrom(targetClrType))
{
if (targetClrType == typeof(IDictionary))
{
targetClrType = typeof(Hashtable);
}
//a bit of recursion here...
IDictionary dictionary = (IDictionary)Activator.CreateInstance(targetClrType);
switch (wireValue.KindCase)
{
case Value.KindOneofCase.StructValue:
foreach (var structField in spannerType.StructType.Fields)
{
dictionary[structField.Name] =
wireValue.StructValue.Fields[structField.Name]
.ConvertToClrType(structField.Type);
}
return(dictionary);
case Value.KindOneofCase.ListValue:
if (spannerType.Code == TypeCode.Struct)
{
for (var i = 0; i < spannerType.StructType.Fields.Count; i++)
{
dictionary[spannerType.StructType.Fields[i].Name] = wireValue
.ListValue.Values[i]
.ConvertToClrType(spannerType.StructType.Fields[i].Type);
}
}
else
{
var i = 0;
foreach (var listItemValue in wireValue.ListValue.Values)
{
dictionary[i] =
listItemValue.ConvertToClrType(spannerType.ArrayElementType);
i++;
}
}
return(dictionary);
default:
throw new ArgumentException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
}
if (targetClrType.IsArray)
{
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NullValue: return(null);
case Value.KindOneofCase.ListValue:
var newArray = Array.CreateInstance(
targetClrType.GetElementType(),
wireValue.ListValue.Values.Count);
var i = 0;
foreach (var obj in wireValue.ListValue.Values.Select(
x => x.ConvertToClrType(spannerType.ArrayElementType, targetClrType.GetElementType())))
{
newArray.SetValue(obj, i);
i++;
}
return(newArray);
default:
throw new InvalidOperationException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
}
if (typeof(IList).IsAssignableFrom(targetClrType))
{
if (targetClrType == typeof(IList))
{
targetClrType = typeof(ArrayList);
}
switch (wireValue.KindCase)
{
case Value.KindOneofCase.NullValue: return(null);
case Value.KindOneofCase.ListValue:
var newList = (IList)Activator.CreateInstance(targetClrType);
foreach (var obj in wireValue.ListValue.Values.Select(
x => x.ConvertToClrType(spannerType.ArrayElementType)))
{
newList.Add(obj);
}
return(newList);
default:
throw new InvalidOperationException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
}
throw new ArgumentException(
$"Invalid Type conversion from {wireValue.KindCase} to {targetClrType.FullName}");
}
public static object ConvertToClrType(this Value wireValue, V1.Type spannerType) => ConvertToClrType(
wireValue, spannerType, typeof(object));
private static T ConvertToClrTypeImpl <T>(Value wireValue, V1.Type spannerType) => (T)ConvertToClrTypeImpl(wireValue, spannerType, typeof(T));
