Factory.cpp

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/**
 * MOAB, a Mesh-Oriented datABase, is a software component for creating,
 * storing and accessing finite element mesh data.
 *
 * Copyright 2004 Sandia Corporation.  Under the terms of Contract
 * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
 * retains certain rights in this software.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 */
 
#ifdef WIN32
#ifdef _DEBUG
// turn off warnings that say they debugging identifier has been truncated
// this warning comes up when using some STL containers
#pragma warning( disable : 4786 )
#endif
#endif
 
#include "moab/Core.hpp"
 
#ifdef XPCOM_MB
 
#include "nsIGenericFactory.h"
 
// define constructor function for Core
NS_GENERIC_FACTORY_CONSTRUCTOR( moab::Core )
 
// support for nsIClassInfo
NS_DECL_CLASSINFO( moab::Core )
 
MB_EXPORT const char* MoabVersion();
MB_EXPORT void GetInterface( MBuuid& interface_requested, UnknownInterface** iface );
MB_EXPORT void DeInitialize();
MB_EXPORT void ReleaseInterface( UnknownInterface* iface );
 
static const nsModuleComponentInfo components[] = {
    { "MOAB Interface", CORE_CID, CORE_CONTRACTID, CoreConstructor, NULL /* NULL if you dont need one */,
      NULL /* NULL if you dont need one */, NULL /* no factory destructor */, NS_CI_INTERFACE_GETTER_NAME( moab::Core ),
      NULL /* no language helper */, &NS_CLASSINFO_NAME( moab::Core ), 0 } };
 
// implement NSGetModule()
NS_IMPL_NSGETMODULE( moab::Core, components );
 
#endif
 
#ifndef WIN32
#define MB_EXPORT extern "C"
#else
#define MB_EXPORT extern "C" __declspec( dllexport )
#endif
 
#include <list>
 
namespace moab
{
 
class ComponentFactory : public UnknownInterface
{
  public:
    ComponentFactory() {}
    virtual ~ComponentFactory() {}
    // returns the interface requested from an object
    virtual int QueryInterface( const MBuuid&, UnknownInterface** );
    // keep track of the objects this component factory creates
    static std::list< UnknownInterface* > objects_in_use;
};
 
// the list that keeps track of all the interfaces generated by this server
std::list< UnknownInterface* > ComponentFactory::objects_in_use;
 
// this QueryInterface function is supposed to create an instance of the object
// that contains the interface requested
//
// note: the object is not the same as the interface, therefore
// we ask the object for the interface that was requested
//
 
int ComponentFactory::QueryInterface( const MBuuid& uuid, UnknownInterface** iface )
{
    // this is an unknown interface that was requested
    // if wanted, we could provide a default interface
    // if IDD_MBUnknown is specified
    if( uuid == IDD_MBUnknown ) return 0;
    // IDD_MBVerde interface was requested
    // create an Verde object and have it return the interface
    // requested
    else if( uuid == IDD_MBCore )
    {
        Core* mdb = new Core;
        // if the object does not contain the interface requested, delete the object
        if( !mdb->QueryInterface( uuid, iface ) )
        {
            delete mdb;
            return 0;
        }
        return 1;
    }
    else
        return 0;
}
 
// returns the interface version
MB_EXPORT const char* MoabVersion()
{
    return MB_INTERFACE_VERSION;
}
 
// Initialize function is accessed by the MBClient when asking for interfaces
MB_EXPORT void GetInterface( MBuuid& interface_requested, UnknownInterface** iface )
{
    // create an instance of our component factory
    ComponentFactory server;
    // ask the component factory to give us the interface we want
    server.QueryInterface( interface_requested, iface );
    // if the interface existed, put it on our list
    if( iface && *iface ) ComponentFactory::objects_in_use.push_front( *iface );
}
 
// DeInitialize function is accessed by the MBClient when disconnecting from this library
// this will clean everything up prior to a disconnection
// from this library
MB_EXPORT void DeInitialize()
{
    // delete all instances of objects
    while( ComponentFactory::objects_in_use.size() )
    {
        UnknownInterface* iface = ComponentFactory::objects_in_use.front();
        ComponentFactory::objects_in_use.pop_front();
        if( iface ) delete iface;
    }
}
 
// ReleaseInterface function is accessed by the MBClient when deleting an interface
 
// ReleaseInterface will delete this interface
MB_EXPORT void ReleaseInterface( UnknownInterface* iface )
{
    if( !iface ) return;
    // remove this object from our list and delete it
    ComponentFactory::objects_in_use.remove( iface );
    delete iface;
}
 
}  // namespace moab