1 #ifndef MSP_DATAFILE_DYNAMICOBJECTLOADER_H_
2 #define MSP_DATAFILE_DYNAMICOBJECTLOADER_H_
4 #include <msp/core/typeregistry.h>
5 #include "collection.h"
15 Loads a dynamically typed object, with the type specified as a statement. The
16 T template parameter is the common base class for all possible loaded types.
18 template<typename T, typename C = Collection>
19 class DynamicObjectLoader: public Loader
28 void operator()(const std::string &, DynamicObjectLoader &) const;
31 typedef Msp::TypeRegistry<CreateObject, DynamicObjectLoader &> TypeRegistry;
37 std::function<void(Collection &, const std::string &, T *)> store_func;
39 static ActionMap shared_actions;
42 DynamicObjectLoader(Collection *);
44 ~DynamicObjectLoader() { delete object; delete obj_loader; }
47 virtual void init_actions();
50 T *get_object() { T *o = object; object = 0; return o; }
51 T *store_object(Collection &, const std::string &);
54 virtual void type(const Symbol &);
58 typename std::enable_if<NeedsCollection<typename U::Loader>::value, typename U::Loader *>::type create_object_loader(U &obj) const;
61 typename std::enable_if<!NeedsCollection<typename U::Loader>::value, typename U::Loader *>::type create_object_loader(U &obj) const;
64 virtual const TypeRegistry &get_type_registry() const = 0;
68 template<typename T, typename C>
69 Loader::ActionMap DynamicObjectLoader<T, C>::shared_actions;
71 template<typename T, typename C>
72 DynamicObjectLoader<T, C>::DynamicObjectLoader(Collection *c):
77 set_actions(shared_actions);
80 template<typename T, typename C>
81 void DynamicObjectLoader<T, C>::init_actions()
83 add("type", &DynamicObjectLoader::type);
86 template<typename T, typename C>
87 T *DynamicObjectLoader<T, C>::store_object(Collection &c, const std::string &name)
90 throw std::logic_error("no store function");
93 store_func(c, name, object);
98 template<typename T, typename C>
99 void DynamicObjectLoader<T, C>::type(const Symbol &t)
102 throw std::logic_error("duplicate type statement");
104 get_type_registry().invoke(t.name, *this);
107 template<typename T, typename C>
109 typename std::enable_if<NeedsCollection<typename U::Loader>::value, typename U::Loader *>::type DynamicObjectLoader<T, C>::create_object_loader(U &obj) const
112 throw no_collection(typeid(U));
113 return new typename U::Loader(obj, *coll);
116 template<typename T, typename C>
118 typename std::enable_if<!NeedsCollection<typename U::Loader>::value, typename U::Loader *>::type DynamicObjectLoader<T, C>::create_object_loader(U &obj) const
120 return new typename U::Loader(obj);
124 template<typename T, typename C>
126 void DynamicObjectLoader<T, C>::CreateObject<U>::operator()(const std::string &, DynamicObjectLoader &ldr) const
130 ldr.obj_loader = ldr.create_object_loader<U>(*obj);
131 ldr.add_auxiliary_loader(*ldr.obj_loader);
132 ldr.store_func = [](Collection &c, const std::string &n, T *o){ c.add(n, static_cast<U *>(o)); };
135 } // namespace DataFile