/// <summary>
/// Implements the .GetTypes method which returns a list of all annotated RDF classes for a given type.
/// </summary>
/// <param name="parameter">A type defintion.</param>
/// <returns><c>true</c> on success, <c>false</c> otherwise.</returns>
public override bool Execute(object parameter = null)
{
List <string> uris = new List <string>();
// Accumulate the annotated RDF classes.
foreach (CustomAttribute attribute in Type.TryGetCustomAttribute("RdfClassAttribute"))
{
uris.Insert(0, attribute.ConstructorArguments.First().Value.ToString());
}
if (uris.Count == 0)
{
if (!Type.Methods.Any(m => m.Name == "GetTypes"))
{
string msg = "{0}: Mapped type has no annotated RDF classes and no overridden GetTypes() method.";
throw new Exception(string.Format(msg, Type.FullName));
}
return(false);
}
TypeDefinition[] types = { Type };
MethodDefinition getTypes = null;
MethodReference getTypeBase = null;
// We iterate through the type hierarchy from top to bottom and find the first GetTypes
// method. That one serves as a template for the override method of the current type in
// which the instructions are being replaced.
foreach (TypeDefinition t in types.Union(Type.GetBaseTypes()).Reverse())
{
getTypes = t.TryGetInheritedMethod("GetTypes");
if (getTypes != null && getTypeBase == null)
{
getTypeBase = getTypes;
break;
}
}
if (getTypes == null)
{
throw new ArgumentException("{0}: Found no GetTypes() method for type.", Type.FullName);
}
if (getTypeBase == null)
{
throw new ArgumentException(string.Format("{0}: Failed to find virtual base method of {1}", Type.FullName, getTypes.FullName));
}
// The override method must be created in the module where the type is defined.
getTypes = getTypeBase.GetOverrideMethod(MainModule);
MethodGeneratorTask generator = new MethodGeneratorTask(getTypes);
generator.Instructions.AddRange(GenerateGetTypesInstructions(generator.Processor, uris));
if (generator.CanExecute())
{
generator.Method.Body.MaxStackSize = 3;
generator.Method.Body.InitLocals = true;
generator.Method.Body.Variables.Add(new VariableDefinition(MainModule.ImportReference(getTypeBase.ReturnType)));
generator.Method.Body.Variables.Add(new VariableDefinition(ClassArrayType));
generator.Execute();
MainModule.ImportReference(ClassType);
}
Type.Methods.Add(getTypes);
foreach (string uri in uris)
{
Log.LogMessage("{0} -> <{1}>", Type.FullName, uri);
}
return(true);
}