public static bool IsSpecified(this MergableElement obj, string propertyName)
{
PropertyInfo property = obj.GetType().GetProperty($"{propertyName}Specified");
if (property != null && property.PropertyType == typeof(bool))
{
return((bool)property.GetValue(obj));
}
return(true);
}
public void Merge(MergableElement baseElement)
{
foreach (PropertyInfo property in GetType().GetProperties())
{
if (Unmergables.Contains(property.Name))
{
continue;
}
if (property.PropertyType.IsArray)
{
Array values = (Array)property.GetValue(this);
Array baseValues = (Array)property.GetValue(baseElement);
if (values == null)
{
property.SetValue(this, baseValues);
continue;
}
if (baseValues == null)
{
continue;
}
bool mergable = typeof(MergableElement).IsAssignableFrom(values.GetType().GetElementType());
IList result = MakeList(values.GetType().GetElementType());
foreach (object value in values)
{
if (mergable)
{
MergableElement baseValue = baseValues.OfType <MergableElement>().FirstOrDefault(m => m.Equals(value));
if (baseValue != null)
{
((MergableElement)value).Merge(baseValue);
}
}
result.Add(value);
}
foreach (object additional in baseValues.Cast <object>().Except(values.Cast <object>()))
{
result.Add(additional);
}
property.SetValue(this, result.GetType().GetMethod("ToArray")?.Invoke(result, Array.Empty <object>()));
}
else
{
object value = property.GetValue(this);
object baseValue = property.GetValue(baseElement);
property.SetValue(this, MergeValues(value, baseValue, this.IsSpecified(property.Name)));
}
}
IList MakeList(System.Type type)
{
System.Type listType = typeof(List <>);
System.Type constructedListType = listType.MakeGenericType(type);
return((IList)Activator.CreateInstance(constructedListType));
}
object MergeValues(object value, object baseValue, bool specified)
{
if (value is MergableElement mergableElement &&
baseValue is MergableElement baseMergableElement)
{
mergableElement.Merge(baseMergableElement);
return(mergableElement);
}
return(!specified ? baseValue : value);
}
}