/// <summary>
/// Converts a constant from one record data type to another record data type.
/// </summary>
/// <param name="originalValue">Original value to convert.</param>
/// <param name="oldDataType">Old record data type.</param>
/// <param name="newDataType">New record data type.</param>
/// <returns>Converted constant.</returns>
protected virtual object ConvertConstantStructuralRecord(object originalValue, StructuralDataType oldDataType, StructuralDataType newDataType)
{
if (oldDataType.Properties.Count != newDataType.Properties.Count)
{
throw new InvalidOperationException(string.Format(CultureInfo.InvariantCulture, "The number of record entries on '{0}' and '{1}' does not match.", oldDataType, newDataType));
}
var oldProperties = oldDataType.Properties;
var newProperties = newDataType.Properties;
var result = newDataType.CreateInstance();
ConstantsMap[originalValue] = result; // Allow cycles
var n = newProperties.Count;
for (var i = 0; i < n; i++)
{
var oldProperty = oldProperties[i];
var newProperty = newProperties[i];
var oldValue = oldProperty.GetValue(originalValue);
var newValue = ConvertConstant(oldValue, oldProperty.Type, newProperty.Type);
newProperty.SetValue(result, newValue);
}
return(result);
}
protected override object ConvertConstantStructuralCore(object originalValue, StructuralDataType oldDataType, StructuralDataType newDataType)
{
var oldPropertyMap = oldDataType.Properties.ToDictionary(p => p.Name, p => p);
var newProperties = newDataType.Properties;
var count = newProperties.Count;
var args = new object[count];
for (var i = 0; i < count; i++)
{
var newProperty = newProperties[i];
var oldProperty = oldPropertyMap[newProperty.Name];
var oldValue = oldProperty.GetValue(originalValue);
var newValue = ConvertConstant(oldValue, oldProperty.Type, newProperty.Type);
args[i] = newValue;
}
var res = newDataType.CreateInstance(args);
return(res);
}
protected override object ConvertConstantStructuralCore(object originalValue, StructuralDataType oldDataType, StructuralDataType newDataType)
{
var res = newDataType.CreateInstance();
ConstantsMap[originalValue] = res; // Allow cycles
var oldPropertyMap = oldDataType.Properties.ToDictionary(p => p.Name, p => p);
var newProperties = newDataType.Properties;
for (int i = 0, n = newProperties.Count; i < n; i++)
{
var newProperty = newProperties[i];
var oldProperty = oldPropertyMap[newProperty.Name];
var oldValue = oldProperty.GetValue(originalValue);
var newValue = ConvertConstant(oldValue, oldProperty.Type, newProperty.Type);
newProperty.SetValue(res, newValue);
}
return(res);
}
/// <summary>
/// Converts a constant by instantiating the new data type based on the converted values of the original data type's properties, in declaration order.
/// </summary>
/// <param name="originalValue">Original value to convert.</param>
/// <param name="oldDataType">Old data type.</param>
/// <param name="newDataType">New data type.</param>
/// <returns>Converted constant.</returns>
/// <remarks>Anonymous types and tuple data types obey to the prerequisite of property ordering according to the constructor parameter list.</remarks>
protected object ConvertConstantStructuralByPropertyOrderInstantiation(object originalValue, StructuralDataType oldDataType, StructuralDataType newDataType)
{
var oldProperties = oldDataType.Properties;
var newProperties = newDataType.Properties;
var n = newProperties.Count;
var args = new object[n];
for (var i = 0; i < n; i++)
{
var oldProperty = oldProperties[i];
var newProperty = newProperties[i];
var oldValue = oldProperty.GetValue(originalValue);
var newValue = ConvertConstant(oldValue, oldProperty.Type, newProperty.Type);
args[i] = newValue;
}
var result = newDataType.CreateInstance(args);
return(result);
}
