private static bool LinkDecoder <T>(IDecoderDescriptor <T> descriptor, BindingFlags bindings,
IDictionary <Type, object> parents)
{
var entityType = typeof(T);
parents[entityType] = descriptor;
if (Linker.TryLinkDecoderAsValue(descriptor))
{
return(true);
}
// Bind descriptor as an array of target type is also array
if (entityType.IsArray)
{
var element = entityType.GetElementType();
var setter = MethodResolver
.Create <Func <Setter <object[], IEnumerable <object> > > >(() =>
SetterGenerator.CreateFromEnumerable <object>())
.SetGenericArguments(element)
.Invoke(null);
return(Linker.LinkDecoderAsArray(descriptor, bindings, element, setter, parents));
}
// Try to bind descriptor as an array if target type IEnumerable<>
foreach (var interfaceType in entityType.GetInterfaces())
{
// Make sure that interface is IEnumerable<T> and store typeof(T)
if (!TypeResolver.Create(interfaceType)
.HasSameDefinitionThan <IEnumerable <object> >(out var interfaceTypeArguments))
{
continue;
}
var elementType = interfaceTypeArguments[0];
// Search constructor compatible with IEnumerable<>
foreach (var constructor in entityType.GetConstructors())
{
var parameters = constructor.GetParameters();
if (parameters.Length != 1)
{
continue;
}
var parameterType = parameters[0].ParameterType;
if (!TypeResolver.Create(parameterType)
.HasSameDefinitionThan <IEnumerable <object> >(out var parameterArguments) ||
parameterArguments[0] != elementType)
{
continue;
}
var setter = MethodResolver
.Create <Func <ConstructorInfo, Setter <object, object> > >(c =>
SetterGenerator.CreateFromConstructor <object, object>(c))
.SetGenericArguments(entityType, parameterType)
.Invoke(null, constructor);
return(Linker.LinkDecoderAsArray(descriptor, bindings, elementType, setter, parents));
}
}
// Bind readable and writable instance properties
foreach (var property in entityType.GetProperties(bindings))
{
if (property.GetGetMethod() == null || property.GetSetMethod() == null ||
property.Attributes.HasFlag(PropertyAttributes.SpecialName))
{
continue;
}
var setter = MethodResolver
.Create <Func <PropertyInfo, Setter <object, object> > >(p =>
SetterGenerator.CreateFromProperty <object, object>(p))
.SetGenericArguments(entityType, property.PropertyType)
.Invoke(null, property);
if (!Linker.LinkDecoderAsObject(descriptor, bindings, property.PropertyType, property.Name, setter,
parents))
{
return(false);
}
}
// Bind public instance fields
foreach (var field in entityType.GetFields(bindings))
{
if (field.Attributes.HasFlag(FieldAttributes.SpecialName))
{
continue;
}
var setter = MethodResolver
.Create <Func <FieldInfo, Setter <object, object> > >(f =>
SetterGenerator.CreateFromField <object, object>(f))
.SetGenericArguments(entityType, field.FieldType)
.Invoke(null, field);
if (!Linker.LinkDecoderAsObject(descriptor, bindings, field.FieldType, field.Name, setter, parents))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Describe and create encoder for given schema using reflection on target entity. Only public instance fields
/// and properties are linked.
/// </summary>
/// <typeparam name="TEntity">Entity type</typeparam>
/// <param name="schema">Entity schema</param>
/// <returns>Entity encoder</returns>
public static IEncoder <TEntity> CreateEncoder <TEntity>(ISchema <TEntity> schema)
{
return(Linker.CreateEncoder(schema, Linker.DefaultBindings));
}
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 LinkEncoderAsObject <TEntity>(IEncoderDescriptor <TEntity> descriptor, BindingFlags bindings,
Type type, string name, object getter, IDictionary <Type, object> parents)
{
if (parents.TryGetValue(type, out var recurse))
{
MethodResolver
.Create <Func <IEncoderDescriptor <TEntity>, string, Func <TEntity, object>, IEncoderDescriptor <object>,
IEncoderDescriptor <object> > >((d, n, a, p) => d.HasField(n, a, p))
.SetGenericArguments(type)
.Invoke(descriptor, name, getter, recurse);
return(true);
}
var fieldDescriptor = MethodResolver
.Create <Func <IEncoderDescriptor <TEntity>, string, Func <TEntity, object>, IEncoderDescriptor <object> > >(
(d, n, a) => d.HasField(n, a))
.SetGenericArguments(type)
.Invoke(descriptor, name, getter);
var result = MethodResolver
.Create <Func <IEncoderDescriptor <object>, BindingFlags, Dictionary <Type, object>, bool> >((d, f, p) =>
Linker.LinkEncoder(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);
}