internal static ProjectionInfo BuildProjections(MemberMappingDescriptor desc, XmlNodeList projections)
{
if (projections.Count < 1)
{
return(new ProjectionInfo());
}
List <ProjectionItem> projectionItems = new List <ProjectionItem>(3);
foreach (XmlNode node in projections)
{
// no check for existance, that is done with schema
string to = GetAttributeValue(node.Attributes["to"]);
if (to == string.Empty)
{
string message = ErrorBuilder.EmptyToAttributeInXmlError(desc, node.InnerXml);
throw new OtisException(message);
}
// if 'from' is missing, it is assumed to be same as 'to'
string from = GetAttributeValue(node.Attributes["from"], to);
projectionItems.Add(
new ProjectionItem(
ExpressionParser.NormalizeExpression(from),
ExpressionParser.NormalizeExpression(to)));
}
return(ProjectionBuilder.Build(desc, projectionItems));
}