Implement ORM #4

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1. AlenPelin commented on May 16, 2017

   

   AlenPelin

   on May 16, 2017

   Author

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   As a temporary workaround it may be easier to convert Json5 to Json and use Json.NET.
2. AlenPelin commented on May 16, 2017

   

   AlenPelin

   on May 16, 2017

   Last edited by AlenPelin

   Author

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   ORM code sample:

       [NotNull]
       public static T Parse<T>(string json5) where T : class
       {
         return (T)GetObject((Json5Object)Json5.Parse(json5), typeof(T));
       }
   
       [NotNull]
       private static object GetObject(IEnumerable<KeyValuePair<string, Json5Value>> dict, Type type)
       {
         var obj = Activator.CreateInstance(type);
         if (obj == null)
         {
           throw new InvalidOperationException();
         }
   
         foreach (var kv in dict)
         {
           var prop = type.GetProperty(kv.Key, BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Public);
           if (prop == null)
           {
             continue;
           }
   
           object value = kv.Value;
           if (value is IEnumerable<KeyValuePair<string, Json5Value>>)
           {
             value = GetObject((IEnumerable<KeyValuePair<string, Json5Value>>)value, prop.PropertyType);
           }
   
           SetValue(prop, obj, value);
         }
   
         return obj;
       }
   
       private static void SetValue(PropertyInfo field, object targetObj, object value)
       {
         object valueToSet;
   
         if (value == null || value == DBNull.Value)
         {
           valueToSet = null;
         }
         else
         {
           var propertyType = field.PropertyType;
           if (propertyType.IsEnum)
           {
             valueToSet = Enum.ToObject(propertyType, value);
           }
           else if (propertyType.IsValueType && IsNullableType(propertyType))
           {
             var underlyingType = Nullable.GetUnderlyingType(propertyType);
             valueToSet = underlyingType.IsEnum ? Enum.ToObject(underlyingType, value) : value;
           }
           else
           {
             var converter = value.GetType().GetMethods().FirstOrDefault(x => x.Name == "op_Implicit" && x.ReturnType == propertyType);
   
             if (converter != null)
             {
               valueToSet = converter.Invoke(null, new[] {value});
             }
             else
             {
               valueToSet = Convert.ChangeType(value, propertyType);
             }
           }
         }
   
         field.SetValue(targetObj, valueToSet);
       }
   
       private static bool IsNullableType(Type type)
       {
         return type != null && type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>);
       }