00001 #ifndef IOKERNEL__POINTER_META_CLASS_H
00002 #define IOKERNEL__POINTER_META_CLASS_H
00003
00004 #include "meta_class.h"
00005 #include "iokernel_forwarders.h"
00006
00007
00008 class PointerMetaClass : public MetaClass {
00009 friend class ObjectFactory;
00010 public:
00011 virtual void write( const ObjectWrapper &obj,
00012 OutputStream* outputStream ) const;
00013
00014 virtual void read( const ObjectWrapper &obj,
00015 InputStream* inputStream ) const;
00016
00017 virtual Iterator* get_iterator( ConstAddress instance, Iterator::Contents contents = Iterator::All ) const;
00018
00019 virtual bool is_elementary() const;
00020
00021 virtual bool is_owning_pointer() const;
00022
00023 virtual bool needs_cloning() const;
00024
00025 virtual MetaClass* get_base_type() const;
00026
00027 virtual void initialize( const ObjectWrapper &obj,
00028 InputStream* inputStream ) const;
00029
00030 virtual MetaClass* get_link_meta_class() const;
00031
00032 virtual void adjust_field_offsets();
00033
00034 virtual VirtualNode* get_virtual_node( const LString &name, const String &what ) const;
00035
00036 virtual void destruct( const ObjectWrapper &obj,
00037 bool called_from_destructor ) const;
00038
00039 Walker::ApplyStatus walk(const Address address,Walker &walk) const;
00040
00041 static const LString &get_class_name();
00042
00043 virtual void walk_referenced_meta_classes(MetaClassApplier *x);
00044
00045 protected:
00046 PointerMetaClass( LString name = emptyLString,
00047 MetaClass* baseType = 0,
00048 bool pointerOwnsObject = false,
00049 bool is_static = false,
00050 bool needs_cloning = false);
00051
00052 static void constructor_function( void* place );
00053
00054 private:
00055 MetaClass* _base_type;
00056 MetaClass* _ptr_to_base_type; // non persistent cache
00057 bool _pointer_owns_object;
00058
00059 // a pointer that has the static attribute has the following properties:
00060 // 1.) PointerMetaClass::_pointer_owns_object must be true
00061 // 2.) the pointer either points to NULL or to an object of exactly _base_type
00062 // (that's why it is called static)
00063 // 3.) The object may either be created by the constructor of the surrounding
00064 // object or if the field is NULL and it is needed by the PointerMetaClass
00065 // during a read in operation
00066 // 4.) The address of the object to which it points must not be taken and stored
00067 // by another instance variable (the object is not addressable)
00068 // It is semantically equivalent to an instance of the surrounding object.
00069 bool _is_static;
00070 bool _needs_cloning;
00071
00072 private:
00073 PointerMetaClass(const PointerMetaClass &);
00074 PointerMetaClass &operator=(const PointerMetaClass &);
00075 };
00076
00077
00078 #endif
