// TODO maybe move some (or all) of this to the TemplateResolver
public static TemplateInfo Load(TemplateResolver resolver, IFileProvider source, string name)
{
string specPath = System.IO.Path.Combine(name, Template.TemplateDefinitionFileName);
if (!source.FileExists(specPath))
throw new FileNotFoundException("Couldn't find template specification: " + specPath + " from " + source.ToString(), specPath);
Dictionary<string, TemplateParameterInfo> parameters = new Dictionary<string, TemplateParameterInfo>();
TemplateInfo inheritedTemplate = null;
using (var fileStream = source.OpenFile(specPath, FileMode.Open))
{
XDocument templateSpec = XDocument.Load(fileStream);
XAttribute inheritsAttr = templateSpec.Element("template").Attribute("inherits");
if (inheritsAttr != null)
{
string inheritedTemplateName = inheritsAttr.Value;
if (!resolver.TryResolve(inheritedTemplateName, out inheritedTemplate))
throw new Exception("Failed to resolve inherted template: " + inheritedTemplateName);
// add inherited parameters
foreach (TemplateParameterInfo param in inheritedTemplate.Parameters)
parameters.Add(param.Name, param);
}
IEnumerable<XElement> parameterElements = templateSpec.XPathSelectElements("/template/parameter");
foreach (XElement parameterElement in parameterElements)
{
string paramName = parameterElement.Attribute("name").Value;
string defaultValue = ReadOptionalAttribute(parameterElement, "select");
string description = ReadOptionalAttribute(parameterElement, "description");
// add or override inherited parameter default value
parameters[paramName] = new TemplateParameterInfo(paramName, description, defaultValue);
}
}
return new TemplateInfo(source, specPath, name, parameters.Values.ToArray(), inheritedTemplate);
}