src/Tizen.NUI/src/internal/XamlBinding/DependencyResolver.cs

   1 using System;
   2 using System.Linq;
   3 using System.Reflection;
   4 using Tizen.NUI.Binding;
   5
   6 namespace Tizen.NUI.Binding
   7 {
   8     internal static class DependencyResolver
   9     {
  10         static Func<Type, object[], object> Resolver { get; set; }
  11
  12         public static void ResolveUsing(Func<Type, object[], object> resolver)
  13         {
  14             Resolver = resolver;
  15         }
  16
  17         public static void ResolveUsing(Func<Type, object> resolver)
  18         {
  19             Resolver = (type, objects) => resolver.Invoke(type);
  20         }
  21
  22         internal static object Resolve(Type type, params object[] args)
  23         {
  24             var result = Resolver?.Invoke(type, args);
  25
  26             if (result != null)
  27             {
  28                 if (!type.IsInstanceOfType(result))
  29                 {
  30                     throw new InvalidCastException("Resolved instance is not of the correct type.");
  31                 }
  32             }
  33
  34             return result;
  35         }
  36
  37         internal static object ResolveOrCreate(Type type, params object[] args)
  38         {
  39             var result = Resolve(type, args);
  40
  41             if (result != null) return result;
  42
  43             if (args.Length > 0)
  44             {
  45                 // This is by no means a general solution to matching with the correct constructor, but it'll
  46                 // do for finding Android renderers which need Context (vs older custom renderers which may still use
  47                 // parameterless constructors)
  48                 if (type.GetTypeInfo().DeclaredConstructors.Any(info => info.GetParameters().Length == args.Length))
  49                 {
  50                     return Activator.CreateInstance(type, args);
  51                 }
  52             }
  53
  54             return Activator.CreateInstance(type);
  55         }
  56     }
  57 }