using System;

using System.Collections.Generic;

using Newtonsoft.Json;

namespace JSONAPI.Extensions

{

public static class TypeExtensions

{

public static bool CanWriteAsJsonApiAttribute(this Type objectType)

{

if (objectType.IsGenericType && objectType.GetGenericTypeDefinition() == typeof (Nullable<>))

objectType = objectType.GetGenericArguments()[0];

return objectType.IsPrimitive

|| typeof (Decimal).IsAssignableFrom(objectType)

|| typeof (Guid).IsAssignableFrom(objectType)

|| typeof (DateTime).IsAssignableFrom(objectType)

|| typeof (DateTimeOffset).IsAssignableFrom(objectType)

|| typeof (String).IsAssignableFrom(objectType)

|| objectType.IsEnum;

}

public static IEnumerable<object> CreateEnumerableInstance(this Type type)

{

Type relType;

if (type.IsGenericType)

{

relType = type.GetGenericArguments()[0];

}

else

{

// Must be an array at this point, right??

relType = type.GetElementType();

}

// Hmm...now we have to create an object that fits this property. This could get messy...

if (!type.IsInterface && !type.IsAbstract)

{

// Whew...okay, just instantiate one of these...

return (IEnumerable<Object>)Activator.CreateInstance(type);

}

// Ugh...now we're really in trouble...hopefully one of these will work:

if (type.IsGenericType)

{

if (type.IsAssignableFrom(typeof(List<>).MakeGenericType(relType)))

{

return (IEnumerable<Object>) Activator.CreateInstance(typeof(List<>).MakeGenericType(relType));

}

if (type.IsAssignableFrom(typeof(HashSet<>).MakeGenericType(relType)))

{

return

(IEnumerable<Object>) Activator.CreateInstance(typeof(HashSet<>).MakeGenericType(relType));

}

//TODO: Other likely candidates??

}

return null;

}

}

}