private static AbstractPatch _LoadById(PatchId id, Context context)
{
XDocument data;
using (Stream xmlStream = context.loadPatch(id))
{
using (XmlReader reader = XmlReader.Create(xmlStream))
{
data = XDocument.Load(reader);
}
}
Checker.Check(data);
XElement version = data.Root.Element("version");
string number = version.Element("number").Value;
string author = version.Element("author").Value;
if ((number != id.version.ToString()) || (author != id.name))
{
throw new ApplicationException(string.Format("Versions mismatch on patch #{0} from {1} (got #{2} from {3})", id.version, id.name, number, author));
}
HashSet <string> restrictToEnvironments;
if (data.Root.Element("restrictToEnvironments") != null)
{
restrictToEnvironments = new HashSet <string>(from elem in data.Root.Element("restrictToEnvironments").Elements() select elem.Value);
}
else
{
restrictToEnvironments = new HashSet <string>();
}
XElement commandSet;
bool isStrictCommandSet;
{
XElement strictCommandSet = data.Root.Element("strictCommandSet");
XElement looseCommandSet = data.Root.Element("looseCommandSet");
if (strictCommandSet != null && looseCommandSet == null)
{
commandSet = strictCommandSet;
isStrictCommandSet = true;
}
else if (strictCommandSet == null && looseCommandSet != null)
{
commandSet = looseCommandSet;
isStrictCommandSet = false;
}
else if (strictCommandSet != null && looseCommandSet != null)
{
throw new ApplicationException("Malformed XML: both strictCommandSet and looseCommandSet found");
}
else
{
throw new ApplicationException("Malformed XML: no CommandSet found");
}
}
var commands = (from elem in commandSet.Elements() select AbstractCommand.Create(elem)).ToArray();
if (isStrictCommandSet)
{
var isPersistent = commands.OfType <AbstractPersistentCommand>().Any();
if (isPersistent)
{
if (commands.Length != 1)
{
throw new ApplicationException("More than one persistent command");
}
if (context.DbDriver.IsDDLTransactional)
{
return(new AtomicPatch(commands, true, restrictToEnvironments, context));
}
else
{
return(new PersistentPatch(commands[0], restrictToEnvironments, context));
}
}
else
{
return(new AtomicPatch(commands, true, restrictToEnvironments, context));
}
}
else
{
return(new AtomicPatch(commands, false, restrictToEnvironments, context));
}
}
public static AbstractPatch LoadById(PatchId id, Context context)
{
return(Cache <AbstractPatch> .instance.get(new KeyValuePair <PatchId, Context>(id, context), () => _LoadById(id, context)));
}
