Ok. , . , "AbstractX" ( "X" - ) -: "ImportX" "ExportX". ExportX , AbstractX Object, AbstractX, , AbstractX, / , - . ImportX , , AbstractX ( AbstractX AbstractX), Object AbstractX. ExportX, ImportX ImportY, ImportZ ..; ExportX ImportY, ImportZ .. , AbstractX, ImportX , Object. , :
public interface AbstractX
{
// The export/import functions are mandatory
// for all such interfaces. They allow
// for the wrappers to be correctly manipulated.
function export() : Object;
function original() : Object;
// The interface functions vary from
// interface to interface. They can
// be called something much more appropriate.
function interfaceFunction1(param : AbstractY) : AbstractZ;
function interfaceFunction2(param : AbstractA) : AbstractB;
}
// A class of type Import_ always implements Abstract_
public class ImportX implements AbstractX
{
// The constructor for an Import_ Object
// is always of type Object.
public function ImportX(obj : Object) : void {
_loadedobj = obj;
_exportobj = obj.export();
}
// Every Import_ class must implement a similar "wrap" function:
public static function wrap(obj : Object) : AbstractX {
var result : AbstractX = null;
if ( obj != null ){
if ( obj is AbstractX ){ // Don't wrap if convertible, directly.
result = obj as AbstractX;
}else if ( obj.original() is AbstractX ){ // Don't double wrap
result = obj.original() as AbstractX;
}else{
// Needs to be wrapped.
result = new ImportX(obj);
}
}
return result;
}
public function export() : Object {
return _exportobj;
}
public function original() : Object {
return _loadedobj;
}
// For the interface functions, we delegate to _exportobj
// and we wrap the return values, but not the parameters.
public function interfaceFunction1(param : AbstractY) : AbstractZ {
return AbstractZ.wrap(_exportobj.interfaceFunction1(param));
}
public function interfaceFunction2(param : AbstractA) : AbstractB {
return AbstractB.wrap(_exportobj.interfaceFunction2(param));
}
private var _loadedobj : Object;
private var _exportobj : Object;
}
// Although an Export_ object provides SIMILAR methods to type Abstract_,
// the signatures need to be changed so that only builtin/predefined types
// appear. Thus Export_ NEVER implements Abstract_.
public class ExportX
{
// The constructor to Export_ always takes an object of type Abstract_
public function ExportX(obj : AbstractX) : void {
_obj = obj;
}
public function original() : Object {
return _obj;
}
public function export() : Object {
return this;
}
// For the interface functions, we delegate to _obj
// and we wrap the parameters, not the return values.
// Also note the change in signature.
public function interfaceFunction1(param : Object) : Object {
return _obj.interfaceFunction1(AbstractY.wrap(param));
}
public function interfaceFunction2(param : Object) : Object {
return _obj.interfaceFunction2(AbstractA.wrap(param));
}
private var _obj : AbstractX = null;
}
// The definition of class X can occur in and be loaded by any module.
public class X implements AbstractX
{
public function X( /* ... */ ) : void {
//...
}
public function export() : Object {
if ( ! _export ){
_export = new ExportX(this);
}
return _export;
}
public function original() : Object {
return this;
}
public function interfaceFunction1(param : AbstractY) : AbstractZ {
// ...
}
public function interfaceFunction2(param : AbstractA) : AbstractB {
// ...
}
private var _export : Object = null;
}
// Ok. So here is how you use this...
var classx : Class = dynamicallyLoadClassFromModule("X","module.swf");
var untypedx : Object = new classx();
var typedx : AbstractX = ImportX.wrap(untypedx);
// Use typedx ...