OrdinalMap[] EmitOrdinals(ILGenerator il, MappingResult result)
{
ValueMap[] fields = result.ValueMappings;
OrdinalMap[] ordinals_mapping = new OrdinalMap[fields.Length];
if (fields.Length > 0)
{
MethodInfo get_ordinal_method =
Dynamics_.GetDataReaderMethod("GetOrdinal");
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldc_I4, fields.Length);
il.Emit(OpCodes.Newarr, typeof(int));
il.Emit(OpCodes.Stfld, result.OrdinalsField);
for (int i = 0, j = fields.Length; i < j; i++)
{
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, result.OrdinalsField);
il.Emit(OpCodes.Ldc_I4, i);
il.Emit(OpCodes.Ldarg_1);
il.Emit(OpCodes.Ldstr, fields[i].Key);
il.Emit(OpCodes.Callvirt, get_ordinal_method);
il.Emit(OpCodes.Stelem_I4);
ordinals_mapping[i] =
new OrdinalMap(i, fields[i].Value, fields[i].RawType)
{
Conversor = fields[i].Conversor
};
}
}
return(ordinals_mapping);
}
/// <summary>
/// Gets the dynamic type for <typeparamref name="T"/>.
/// </summary>
/// <param name="type">
/// When this method returns contains the type that was dynamically
/// created for the type <typeparamref name="T"/>, or <c>null</c> is
/// a dynamic type for <typeparamref name="T"/> does not exists.
/// </param>
/// <returns></returns>
static bool TryGetDynamicType(string prefix, out Type type)
{
string dynamic_type_name = Dynamics_.GetDynamicTypeName(prefix,
typeof(T));
type = Dynamics_.ModuleBuilder.GetType(dynamic_type_name);
return(type != null);
}
/// <summary>
/// Gets the dynamic type for <typeparamref source="T"/>.
/// </summary>
/// <returns>
/// The dynamic type for <typeparamref source="T"/>.
/// </returns>
/// <remarks>
/// If the dynamic type does not already exists, it will be created.
/// </remarks>
Type GetDynamicType(string prefix)
{
string dynamic_type_name =
Dynamics_
.GetDynamicTypeName(prefix, type_t_, "_mapper");
Type type = Dynamics_.ModuleBuilder.GetType(dynamic_type_name);
if (type == null)
{
// If the specified type is an interface and the factory was not
// specified we are not able to perform the mapping.
//
// TODO(neylor.silva) Create
if (type_t_.IsInterface && factory_ == null)
{
throw new ArgumentException(
R.Mappers_CannotMapInterfaces.Fmt(type_t_.FullName));
}
type = MakeDynamicType(dynamic_type_name);
}
return(type);
}
void EmitMapMethod(TypeBuilder type, MappingResult result)
{
MethodBuilder builder = type
.DefineMethod("MapInternal",
MethodAttributes.Public | MethodAttributes.HideBySig |
MethodAttributes.Virtual, typeof(T),
new Type[] { typeof(IDataReader) });
// define that the method is allowed to acess non-public members.
/*Type permission = typeof(ReflectionPermissionAttribute);
* ConstructorInfo ctor =
* permission
* .GetConstructor(new[] { typeof(SecurityAction) });
* PropertyInfo access = permission.GetProperty("Flags");
* var reflection_permission_attribute =
* new CustomAttributeBuilder(ctor, new object[] { SecurityAction.Demand },
* new[] { access },
* new object[] {
* ReflectionPermissionFlag.MemberAccess |
* ReflectionPermissionFlag.RestrictedMemberAccess
* });
*
* builder.SetCustomAttribute(reflection_permission_attribute);*/
ILGenerator il = builder.GetILGenerator();
// Create a new instance of the T using the associated class loader and
// stores in a local variable.
il.DeclareLocal(type_t_);
MethodInfo callable = typeof(CallableDelegate <T>).GetMethod("Invoke");
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, result.LoaderField);
il.Emit(OpCodes.Callvirt, callable);
il.Emit(OpCodes.Stloc_0);
// Set the value of the properties of the newly created T object.
OrdinalMap[] fields = result.OrdinalsMapping;
for (int i = 0, j = fields.Length; i < j; i++)
{
OrdinalMap field = fields[i];
int ordinal = field.Key;
PropertyInfo property = field.Value;
MethodInfo get_x_method =
Dynamics_.GetDataReaderMethod(
Dynamics_.GetDataReaderMethodName(field.RawType ??
property.PropertyType), data_reader_type_);
// Get the set method of the current property. If the property does
// not have a set method ignores it.
MethodInfo set_x_property = property.GetSetMethod(true);
if (set_x_property == null)
{
throw new ArgumentException(
"The property {0} does not have a set method.".Fmt(property.Name));
}
// loaded the "data transfer object"
il.Emit(OpCodes.Ldloc_0);
// if the conversor method is defined we need to load the
// "this" pointer onto the stack before the data reader, so we can
// chain the conversion method call after the value is retrieved
// from the data reader.
MethodInfo conversor = null;
if (field.Conversor != null)
{
conversor = (field.Conversor.Body as MethodCallExpression).Method;
if (!conversor.IsStatic || !conversor.IsPublic)
{
throw new ArgumentException(
"The \"conversor\" method of the property {0} is not static or public"
.Fmt(property.Name));
}
}
// loads the data reader
il.Emit(OpCodes.Ldarg_1);
// load the ordinals_ array
il.Emit(OpCodes.Ldarg_0);
il.Emit(OpCodes.Ldfld, result.OrdinalsField);
// load the element of the array at |ordinal| position
EmitLoad(il, ordinal);
il.Emit(OpCodes.Ldelem_I4);
// call the "get...(int i)" method of the datareader
// -> i will be equals to the element loaded from the
// array at positiom "ordinal"
il.Emit(OpCodes.Callvirt, get_x_method);
// the stack now contains the returned value of "get...(int i)"
// method.
// convert the result of get method and...
if (conversor != null)
{
il.Emit(OpCodes.Call, conversor);
}
// store it on the loaded field.
il.Emit(OpCodes.Callvirt, set_x_property);
}
ConstantMap[] constant_maps = result.ConstantMappings;
for (int i = 0, j = constant_maps.Length; i < j; i++)
{
ITypeMap map = constant_maps[i].Key;
PropertyInfo property = constant_maps[i].Value;
if (map.MapType != TypeMapType.Ignore)
{
// Get the set method of the current property. If the property does
// not have a set method ignores it.
MethodInfo set_x_property = property.GetSetMethod(true);
if (set_x_property == null)
{
continue;
}
il.Emit(OpCodes.Ldloc_0);
EmitLoad(il, map);
il.Emit(OpCodes.Callvirt, set_x_property);
}
}
// load the local T and return.
il.Emit(OpCodes.Ldloc_0);
il.Emit(OpCodes.Ret);
}
