classfinder.d

module dnetdev.webserver.common.classfinder;

Interface findAndCreateClass(Interface)(string name) if (is(Interface == class) || is(Interface == interface)) {
	import std.experimental.allocator;
    auto alloc = theAllocator();

    auto classinfo = TypeInfo_Class.find(name);
    if (classinfo is null)
    	return null;
    
    size_t issize = classinfo.init.length;
    void[] dataallocated = alloc.allocate(issize);
    
    Object obj;
    dataallocated[] = cast(void[])classinfo.init[];
    if (dataallocated is null)
    	return null;

    obj = cast(Object)dataallocated.ptr;

    if (obj !is null) {
        if (classinfo.defaultConstructor !is null)
            (cast(void function(Object))classinfo.defaultConstructor)(obj);

        if (Interface obj2 = cast(Interface)obj) {
            return obj2;
        } else {
        	alloc.dispose(obj);
            return null;
        }
    } else {
    	alloc.dispose(dataallocated);
        return null;
    }
}