public static int ParseAndValidateRequiredResourceIndex(this IThreeMfPropertyResource propertyResource, XElement element, string attributeName)
{
var index = element.AttributeIntValueOrThrow(attributeName);
propertyResource.ValidatePropertyIndex(index);
return(index);
}
public static int?ParseAndValidateOptionalResourceIndex(this IThreeMfPropertyResource propertyResource, XElement element, string attributeName)
{
var attribute = element.Attribute(attributeName);
if (attribute == null)
{
return(null);
}
if (!int.TryParse(attribute.Value, out var index))
{
throw new ThreeMfParseException($"Property index '{attribute.Value}' is not an int.");
}
propertyResource.ValidatePropertyIndex(index);
return(index);
}
private static void ValidatePropertyIndex(this IThreeMfPropertyResource propertyResource, int index)
{
var propertyCount =
(propertyResource.PropertyItems as IList <ThreeMfBase>)?.Count ??
(propertyResource.PropertyItems as IList <ThreeMfColor>)?.Count ??
(propertyResource.PropertyItems as IList <ThreeMfTexture2DCoordinate>)?.Count ??
-1;
if (propertyCount == -1)
{
Debug.Assert(false, "Unknown property item type. Falling back to much slower .Count().");
propertyCount = propertyResource.PropertyItems.Count();
}
if (index < 0 || index >= propertyCount)
{
throw new ThreeMfParseException($"Property index is out of range. Value must be [0, {propertyCount}).");
}
}
public static bool TryGetPropertyResource(this Dictionary <int, ThreeMfResource> resourceMap, XElement element, string attributeName, out IThreeMfPropertyResource propertyResource)
{
propertyResource = null;
var propertyReferenceAttribute = element.Attribute(attributeName);
if (propertyReferenceAttribute != null)
{
if (!int.TryParse(propertyReferenceAttribute.Value, out var propertyIndex))
{
throw new ThreeMfParseException($"Property reference index '{propertyReferenceAttribute.Value}' is not an int.");
}
if (resourceMap.ContainsKey(propertyIndex))
{
propertyResource = resourceMap[propertyIndex] as IThreeMfPropertyResource;
if (propertyResource == null)
{
throw new ThreeMfParseException($"Property resource was expected to be of type {nameof(IThreeMfPropertyResource)}.");
}
return(true);
}
}
return(false);
}
