/// <summary>
/// Describe and create decoder for given schema using reflection on target entity and provided binding flags.
/// </summary>
/// <typeparam name="TEntity">Entity type</typeparam>
/// <param name="schema">Entity schema</param>
/// <param name="bindings">Binding flags used to filter bound fields and properties</param>
/// <returns>Entity decoder</returns>
public static IDecoder <TEntity> CreateDecoder <TEntity>(ISchema <TEntity> schema, BindingFlags bindings)
{
if (!Linker.LinkDecoder(schema.DecoderDescriptor, bindings, new Dictionary <Type, object>()))
{
throw new ArgumentException($"can't link decoder for type '{typeof(TEntity)}'", nameof(schema));
}
return(schema.CreateDecoder(ConstructorGenerator.CreateConstructor <TEntity>()));
}
private static bool LinkDecoderAsObject <TEntity>(IDecoderDescriptor <TEntity> descriptor, BindingFlags bindings,
Type type, string name, object setter, IDictionary <Type, object> parents)
{
var constructor = MethodResolver
.Create <Func <object> >(() => ConstructorGenerator.CreateConstructor <object>())
.SetGenericArguments(type)
.Invoke(null);
if (parents.TryGetValue(type, out var parent))
{
MethodResolver
.Create <Func <IDecoderDescriptor <TEntity>, string, Func <object>, Setter <TEntity, object>,
IDecoderDescriptor <object>, IDecoderDescriptor <object> > >((d, n, c, s, p) =>
d.HasField(n, c, s, p))
.SetGenericArguments(type)
.Invoke(descriptor, name, constructor, setter, parent);
return(true);
}
var fieldDescriptor = MethodResolver
.Create <Func <IDecoderDescriptor <TEntity>, string, Func <object>, Setter <TEntity, object>,
IDecoderDescriptor <object> > >((d, n, c, s) => d.HasField(n, c, s))
.SetGenericArguments(type)
.Invoke(descriptor, name, constructor, setter);
var result = MethodResolver
.Create <Func <IDecoderDescriptor <object>, BindingFlags, Dictionary <Type, object>, bool> >((d, f, p) =>
Linker.LinkDecoder(d, f, p))
.SetGenericArguments(type)
.Invoke(null, fieldDescriptor, bindings, parents);
return(result is bool success && success);
}
private static bool LinkDecoderAsArray <TEntity>(IDecoderDescriptor <TEntity> descriptor, BindingFlags bindings,
Type type, object setter, IDictionary <Type, object> parents)
{
var constructor = MethodResolver
.Create <Func <object> >(() => ConstructorGenerator.CreateConstructor <object>())
.SetGenericArguments(type)
.Invoke(null);
if (parents.TryGetValue(type, out var recurse))
{
MethodResolver
.Create <Func <IDecoderDescriptor <TEntity>, Func <object>, Setter <TEntity, IEnumerable <object> >,
IDecoderDescriptor <object>, IDecoderDescriptor <object> > >((d, c, s, p) => d.HasElements(c, s, p))
.SetGenericArguments(type)
.Invoke(descriptor, constructor, setter, recurse);
return(true);
}
var itemDescriptor = MethodResolver
.Create <Func <IDecoderDescriptor <TEntity>, Func <object>, Setter <TEntity, IEnumerable <object> >,
IDecoderDescriptor <object> > >((d, c, s) => d.HasElements(c, s))
.SetGenericArguments(type)
.Invoke(descriptor, constructor, setter);
var result = MethodResolver
.Create <Func <IDecoderDescriptor <object>, BindingFlags, Dictionary <Type, object>, bool> >((d, f, p) =>
Linker.LinkDecoder(d, f, p))
.SetGenericArguments(type)
.Invoke(null, itemDescriptor, bindings, parents);
return(result is bool success && success);
}
