private static IDictionary <Type, MethodInfo> NewDispatchCache(IDomNodeVisitor v)
{
var dispatch = new Dictionary <Type, MethodInfo>();
foreach (var face in v.GetType().GetInterfaces())
{
if (!typeof(IDomNodeVisitor).IsAssignableFrom(face))
{
continue;
}
if (typeof(IDomNodeVisitor) == face)
{
continue;
}
var mapping = v.GetType().GetInterfaceMap(face);
for (int i = 0; i < mapping.InterfaceMethods.Length; i++)
{
if (mapping.InterfaceMethods[i].Name == "Visit")
{
var elementType = mapping.InterfaceMethods[i].GetParameters()[0].ParameterType;
dispatch[elementType] = mapping.TargetMethods[i];
}
}
}
return(dispatch);
}
public DomNodeVisitDispatcher(IDomNodeVisitor visitor)
{
if (visitor == null)
{
throw new ArgumentNullException(nameof(visitor));
}
_visitor = visitor;
}
public static void Visit(DomObject obj, IDomNodeVisitor visitor)
{
if (obj == null)
{
throw new ArgumentNullException(nameof(obj));
}
if (visitor == null)
{
throw new ArgumentNullException(nameof(visitor));
}
DomNodeVisitDispatcher.Create(visitor).Dispatch(obj);
}
private static void FastDispatch(IDomNodeVisitor v, DomObject obj)
{
switch (obj)
{
case DomElement _:
v.Visit((DomElement)obj);
return;
case DomAttribute _:
v.Visit((DomAttribute)obj);
return;
case DomText _:
v.Visit((DomText)obj);
return;
case DomCDataSection _:
v.Visit((DomCDataSection)obj);
return;
case DomEntityReference _:
v.Visit((DomEntityReference)obj);
return;
case DomEntity _:
v.Visit((DomEntity)obj);
return;
case DomProcessingInstruction _:
v.Visit((DomProcessingInstruction)obj);
return;
case DomComment _:
v.Visit((DomComment)obj);
return;
case DomDocument _:
v.Visit((DomDocument)obj);
return;
case DomDocumentType _:
v.Visit((DomDocumentType)obj);
return;
case DomDocumentFragment _:
v.Visit((DomDocumentFragment)obj);
return;
case DomNotation _:
v.Visit((DomNotation)obj);
return;
}
}
public static void VisitAll(IEnumerable <DomObject> objs, IDomNodeVisitor visitor)
{
if (objs == null || visitor == null)
{
return;
}
var d = DomNodeVisitDispatcher.Create(visitor);
foreach (var obj in objs)
{
d.Dispatch(obj);
}
}
public static IDomNodeVisitDispatcher Create(IDomNodeVisitor visitor)
{
if (visitor is IDomNodeVisitDispatcher d)
{
return(d);
}
var result = new DomNodeVisitDispatcher(visitor);
if (result.DispatchCache.IsEmpty)
{
return(new FastDispatcher(visitor));
}
return(result);
}
public FastDispatcher(IDomNodeVisitor visitor)
{
_visitor = visitor;
}