private static void EmitComplexSetField(ILGenerator iL, FieldMappingInfo fieldMapping)
{
//call Map{Object|Array|List}(object source)
iL.Emit(OpCodes.Call, listMethod.GetMapping(fieldMapping.SourceFieldType, fieldMapping.DestinationFieldType));
//set mapped value to destination field
iL.Emit(OpCodes.Stfld, fieldMapping.DestinationField);
}
private static void EmitComplexFieldMapping(ILGenerator iL, FieldMappingInfo fieldMapping, bool isClass)
{
if (fieldMapping.SourceFieldType.IsValueType)
{
//load destination object from variable
EmitLoadDestinationObject(iL, isClass);
//load source argument
iL.Emit(OpCodes.Ldarg_0);
//load field value from source
iL.Emit(OpCodes.Ldfld, fieldMapping.SourceField);
EmitComplexSetField(iL, fieldMapping);
}
else
{
Label label = iL.DefineLabel();
//load source argument
iL.Emit(OpCodes.Ldarg_0);
//load field value from source
iL.Emit(OpCodes.Ldfld, fieldMapping.SourceField);
//store field value in local variable at 1 position
iL.Emit(OpCodes.Stloc_1);
iL.Emit(OpCodes.Ldloc_1);
//check if field value is not null
iL.Emit(OpCodes.Brfalse_S, label);
//load destination object from variable
EmitLoadDestinationObject(iL, isClass);
//load source field value from variable
iL.Emit(OpCodes.Ldloc_1);
EmitComplexSetField(iL, fieldMapping);
//end if
iL.MarkLabel(label);
}
}
private static bool LoadFields(Type sourceType, Type destinationType, List <FieldMappingInfo> fieldMappings)
{
var sourceFields = GetFields(sourceType);
if (sourceFields.Count == 0)
{
return(false);
}
bool isComplexMapping = false;
var bindingFlags = BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public;
while (destinationType != objectType)
{
var fields = destinationType.GetFields(bindingFlags);
for (var i = fields.Length - 1; i > -1; i--)
{
var destinationField = fields[i];
sourceFields.TryGetValue(GetFieldNameHash(destinationField.Name), out var sourceField);
if (sourceField != null)
{
var sourceFieldType = sourceField.FieldType;
var destinationFieldType = destinationField.FieldType;
var fieldMapping = new FieldMappingInfo()
{
SourceField = sourceField,
DestinationField = destinationField
};
if (sourceFieldType.IsEnum)
{
if (!(destinationFieldType.IsEnum || destinationFieldType == stringType || destinationFieldType == objectType || IsNullable(destinationFieldType)))
{
sourceFieldType = GetEnumType(sourceFieldType);
}
}
else if (destinationFieldType.IsEnum && !(sourceFieldType == stringType || IsNullable(sourceFieldType)))
{
destinationFieldType = GetEnumType(destinationFieldType);
}
if (sourceFieldType == destinationFieldType)
{
fieldMapping.IsSimpleMapping = true;
}
else
{
fieldMapping.SourceFieldType = sourceFieldType;
fieldMapping.DestinationFieldType = destinationFieldType;
isComplexMapping = true;
}
fieldMappings.Add(fieldMapping);
}
}
destinationType = destinationType.BaseType;
bindingFlags = BindingFlags.Instance | BindingFlags.NonPublic;
}
return(isComplexMapping);
}
private static void EmitEnumFieldMapping(ILGenerator iL, FieldMappingInfo fieldMapping, bool isClass)
{
EmitLoadDestinationObject(iL, isClass);
//load source from argument
iL.Emit(OpCodes.Ldarg_0);
//load parameters to MapEnumInternal method
iL.Emit(OpCodes.Ldfld, fieldMapping.SourceField);
iL.Emit(OpCodes.Ldc_I8, GetEnumMapping(fieldMapping.SourceFieldType, fieldMapping.DestinationFieldType));
//call MapEnumInternal
iL.Emit(OpCodes.Call, mapEnumMethodInfo);
//set mapped value to destination field
iL.Emit(OpCodes.Stfld, fieldMapping.DestinationField);
}
private static void EmitStringToEnumFieldMapping(ILGenerator iL, FieldMappingInfo fieldMapping, bool isClass)
{
//load destination from variable at 0 position
EmitLoadDestinationObject(iL, isClass);
//load source from argument
iL.Emit(OpCodes.Ldarg_0);
//load parameters to MapEnumInternal method
iL.Emit(OpCodes.Ldfld, fieldMapping.SourceField);
//call MapEnumInternal
iL.Emit(OpCodes.Call, mapStringToEnumMethodInfo.MakeGenericMethod(fieldMapping.DestinationFieldType));
//set mapped value to destination field
iL.Emit(OpCodes.Stfld, fieldMapping.DestinationField);
}
private static void EmitStringFieldMapping(ILGenerator iL, FieldMappingInfo fieldMapping, bool isClass)
{
//load destination from variable at 0 position
EmitLoadDestinationObject(iL, isClass);
//load source from argument
iL.Emit(OpCodes.Ldarg_0);
//load parameters to MapEnumInternal method
iL.Emit(OpCodes.Ldflda, fieldMapping.SourceField);
iL.Emit(OpCodes.Constrained, fieldMapping.SourceFieldType);
//call MapEnumInternal
iL.Emit(OpCodes.Callvirt, objectType.GetMethod("ToString"));
//set mapped value to destination field
iL.Emit(OpCodes.Stfld, fieldMapping.DestinationField);
}
private static void EmitSimpleFieldMapping(ILGenerator iL, FieldMappingInfo fieldMapping, bool isClass)
{
if (isClass)
{
iL.Emit(OpCodes.Ldloc_0);
}
else
{
iL.Emit(OpCodes.Ldloca_S, 0);
}
//load source reference
iL.Emit(OpCodes.Ldarg_0);
//copy source field to destination
iL.Emit(OpCodes.Ldfld, fieldMapping.SourceField);
iL.Emit(OpCodes.Stfld, fieldMapping.DestinationField);
}
private static bool EmitPrimitiveFieldMapping(ILGenerator iL,
FieldMappingInfo fieldMapping, bool isClass)
{
var mappingKey = GetMappingKey(fieldMapping.SourceFieldType, fieldMapping.DestinationFieldType);
if (!primitiveTypeMappings.ContainsKey(mappingKey))
{
return(false);
}
EmitLoadDestinationObject(iL, isClass);
iL.Emit(OpCodes.Ldarg_0);
iL.Emit(OpCodes.Ldfld, fieldMapping.SourceField);
iL.Emit(OpCodes.Call, primitiveTypeMappings[mappingKey]);
iL.Emit(OpCodes.Stfld, fieldMapping.DestinationField);
return(true);
}
private void CheckCircleReferences(Table table, TableMappingDefinition mappingDefinition)
{
if (_tablesToUpdateCircleReferences.ContainsKey(table.Name))
{
_tablesToUpdateCircleReferences[table.Name].ForEach(r =>
{
TableMappingDefinition temp = _tableMappingDefinitions.Single(d => d.DestinationTable.Name.Equals(r.OriginTableName));
FieldMappingDefinition fieldMappingDefinition = temp.FieldMappingDefinitions.SingleOrDefault(f => f.DestinationField.Name.Equals(r.OriginFieldName));
if(fieldMappingDefinition != null)
{
SourceTable sourceTable = temp.SourceTable;
Field sourceField = fieldMappingDefinition.SourceField;
DestinationTable destinationTable = temp.DestinationTable;
Field destinationField = fieldMappingDefinition.DestinationField;
FieldMappingInfo info = new FieldMappingInfo
{
DestinationField = destinationField,
DestinationTable = destinationTable,
SourceField = sourceField,
SourceTable = sourceTable
};
mappingDefinition.CircleReferences.Add(info);
}
});
}
}