Binman/src/lib/Composition.vala

using Invercargill;
using InvercargillJson;

namespace Binman {

    public Attempts<CompositionComponent> get_composition(string path = "/etc/composition") throws Error {
        return new JsonlInputStream(File.new_for_path(path).read())
            .as_property_groups()
            .try_map_with<CompositionComponent>(CompositionComponent.get_mapper());
    }

    public class CompositionComponent {
        public string name { get; set; }
        public BinaryData key { get; set; }
        public Vector<string> uris { get; set; }

        public static PropertyMapper<CompositionComponent> get_mapper() {
            return PropertyMapper.build_for<CompositionComponent>(cfg => cfg
                .map<string>("name", o => o.name, (o, v) => o.name = v)
                .map<string>("key", o => o.key.to_base64(), (o, v) => o.key = new BinaryData.from_base64(v))
                .map_many<string>("uris", o => o.uris, (o, v) => o.uris = v.to_vector())
                .set_constructor(() => new CompositionComponent())
            );
        }
    }

}