/// <summary>
///
/// </summary>
/// <param name="context"></param>
/// <param name="typeToBuild"></param>
/// <param name="existing"></param>
/// <param name="idToBuild"></param>
/// <param name="il"></param>
protected override void BuildUp(IBuilderContext context, Type typeToBuild, object existing, string idToBuild,
ILGenerator il)
{
IConstructorChooserPolicy ctorChooser = GetConstructorChooser(context, typeToBuild, idToBuild);
ConstructorInfo ctor = ctorChooser.ChooseConstructor(typeToBuild);
Label existingObjectNotNull = il.DefineLabel();
Label done = il.DefineLabel();
// If existing object (arg 2) is null, call the constructor
il.Emit(OpCodes.Ldarg_2);
il.Emit(OpCodes.Ldnull);
il.Emit(OpCodes.Ceq);
il.Emit(OpCodes.Brfalse, existingObjectNotNull);
// resolve all constructor parameters...
if (ctor != null)
{
foreach (ParameterInfo parameter in ctor.GetParameters())
{
EmitResolveParameter(il, parameter);
FixupParameterType(il, parameter.ParameterType);
}
}
// invoke constructor, leaving the new object on the top of the stack...
EmitCallConstructor(il, ctor, typeToBuild);
// And skip around the else clause
il.Emit(OpCodes.Br_S, done);
// We have an existing object, just get it on top of the stack
il.MarkLabel(existingObjectNotNull);
il.Emit(OpCodes.Ldarg_2);
il.MarkLabel(done);
}
private static IConstructorChooserPolicy GetConstructorChooser(IBuilderContext context, Type typeToBuild,
string idToBuild)
{
IConstructorChooserPolicy ctorChooser =
context.Policies.Get <IConstructorChooserPolicy>(typeToBuild, idToBuild);
if (ctorChooser == null)
{
ctorChooser = new DefaultConstructorChooserPolicy();
context.Policies.Set <IConstructorChooserPolicy>(ctorChooser, typeToBuild, idToBuild);
}
return(ctorChooser);
}
