C++ Pair::object方法代码示例

// getObject() -- Get/Find the object (component) we're sending to
Component* Component::SendData::getObject(Component* gobj, const char* const id, const int n)
{
    // Did we already find the object?
    if (obj == nullptr) {
        // No, then try to find it among our components ...
        Pair* p = nullptr;
        if (n <= 0) {
            // When n is zero (or less) just use 'id' as
            // the name when finding the object.
            p = gobj->findByName(id);
        }
        else {
            // ---
            // When n is greater than zero, use 'id' as a format
            // with 'n' to get the name.  Great for items in rows
            // or columns.
            //   Example:   n = 5
            //             id = xxx.%d
            //      gives name = xxx.5
            // ---
            char name[128];
            std::sprintf(name,id,n);
            p = gobj->findByName(name);
        }
        if (p != nullptr) obj = static_cast<Component*>(p->object());
    }
    return obj;
}

//------------------------------------------------------------------------------
// updateData() -- Update non-time critical (background) stuff here
//------------------------------------------------------------------------------
void Component::updateData(const LCreal dt)
{
    // Update all my children
    PairStream* subcomponents = getComponents();
    if (subcomponents != 0) {
        if (selection != 0) {
            // When we've selected only one
            if (selected != 0) selected->updateData(dt);
        }
        else {
            // When we should update them all
            List::Item* item = subcomponents->getFirstItem();
            while (item != 0) {
                Pair* pair = (Pair*)(item->getValue());
                Component* obj = (Component*)( pair->object() );
                if (obj != 0) obj->updateData(dt);
                item = item->getNext();
            }
        }
        subcomponents->unref();
        subcomponents = 0;
    }
    
    // Update our log file
    if (elog0 != 0) {
        elog0->updateData(dt);
    }
}

//------------------------------------------------------------------------------
// reset() -- Reset parameters
//------------------------------------------------------------------------------
void Component::reset()
{
   PairStream* subcomponents = getComponents();
   if (subcomponents != 0) {
        if (selection != 0) {
            // When we've selected only one
            if (selected != 0) selected->reset();
        }
        else {
            // When we should reset them all
            List::Item* item = subcomponents->getFirstItem();
            while (item != 0) {
                Pair* pair = (Pair*)(item->getValue());
                Component* obj = (Component*)( pair->object() );
                if (obj != 0) obj->reset();
                item = item->getNext();
            }
        }
        subcomponents->unref();
        subcomponents = 0;
    }
    
    // Reset the log file
    if (elog0 != 0) {
        elog0->reset();
    }
}

bool StateMachine::setSlotStateMachines(const PairStream* const msg)
{
   // First remove the old list; and make sure we tell the old stMachList
   // that we're no longer their container.
   if (stMachList != nullptr) {
      List::Item* item = stMachList->getFirstItem();
      while (item != nullptr) {
         Pair* p = static_cast<Pair*>(item->getValue());
         Component* q = static_cast<Component*>(p->object());
         q->container(nullptr);
         item = item->getNext();
      }
      stMachList = nullptr;
   }

   // Build a new list containing only StateMachine class (or derived) objects
   if (msg != nullptr) {
      PairStream* newList = new PairStream();

      // For each object in the list; if it's a StateMachine (or derived from) then
      // clone the object and add it to the new list.
      const List::Item* item = msg->getFirstItem();
      while (item != nullptr) {
         const Pair* p = static_cast<const Pair*>(item->getValue());
         const StateMachine* q = dynamic_cast<const StateMachine*>(p->object());

         if (q != nullptr) {
            Pair* cp = static_cast<Pair*>(p->clone());
            StateMachine* cq = static_cast<StateMachine*>(cp->object());
            cq->container(this);
            newList->put(cp);
         }
         else {
            std::cerr << "StateMachine::setSlotStateMachines(): " << *p->slot() << " is not a StateMachine!" << std::endl;
         }

         item = item->getNext();
      }

      // Set the pointer to the new stMach list
      stMachList = newList;
   }

   return true;
}

// Send an event message to component 'id'
bool Component::send(const char* const id, const int event)
{
    bool val {};
    Pair* p = findByName(id);
    if (p != nullptr) {
        const auto g = static_cast<Component*>(p->object());
        val = g->event(event);
    }
    return val;
}

// Send an event message to component 'id'
bool Component::send(const char* const id, const int event)
{
    bool val = false;
    Pair* p = findByName(id);
    if (p != 0) {
        Component* g = (Component*) p->object();
        val = g->event(event);
    }
    return val;
}

//------------------------------------------------------------------------------
// select() -- select one of our components, using String or Number
//------------------------------------------------------------------------------
bool Component::select(const String* const name)
{
    bool ok {true};
    selected = nullptr;
    setSelectionName(nullptr);
    if (name != nullptr) {
        setSelectionName(name);
        Pair* p = findByName(*name);
        if (p != nullptr) selected = static_cast<Component*>(p->object());
        else {
            std::cerr << "Component::select: name not found!"  << std::endl;
            ok = false;
        }
    }
    return ok;
}

//------------------------------------------------------------------------------
// select() -- select one of our components, using String or Number
//------------------------------------------------------------------------------
bool Component::select(const String* const name)
{
    bool ok = true;
    selected = 0;
    setSelectionName(0);
    if (name != 0) {
        setSelectionName(name);
        Pair* p = findByName(*name);
        if (p != 0) selected = (Component*) p->object();
        else {
            std::cerr << "Component::select: name not found!"  << std::endl; 
            ok = false;
        }
    }
    return ok;
}

// -----------------------------------------------------------------
// Sets the state machine 'name' or zero to clear.  Return true
// if successful. If the 'code' is CHK_CUR_STATE or GET_NEXT_STATE
// then we do NOT actually set the stMach, but we only check to
// see if the stMach 'name' exists.
// -----------------------------------------------------------------
bool StateMachine::setStMach(const char* const name, const StateTableCode code)
{
   bool ok = false;

   if (code == CURR_STATE) {

      // Current state is now also the previous state
      StateMachine* oldStMach = stMach;

      // First, check to see if they're asking for the same state
      // as our current state.
      ok = (stMachName == nullptr && name == nullptr);
      if (!ok && stMachName != nullptr && name != nullptr) {
         ok = *stMachName == name;
      }

      // When they're not the same then we make a switch ...
      if (!ok) {
         if (name != nullptr) {
            Pair* p = findStMachByName(name);
            if (p != nullptr) {
               stMach = static_cast<StateMachine*>(p->object());
               stMachName = p->slot();
               ok = true;
            }
         }
         else {
            // 'name' is null, so set the new state to null.
            stMach = nullptr;
            stMachName = nullptr;
            ok = true;
         }
         if (ok) {
            pStMach = oldStMach;
         }
      }

   }

   else {
      // -- only need to look to see if this named state machine exists.
      ok = (findStMachByName(name) != nullptr);
   }

   return ok;
}

//------------------------------------------------------------------------------
// shutdownNotification() -- Default shutdown
//------------------------------------------------------------------------------
bool Component::shutdownNotification()
{
   // Tell all of our components
   PairStream* subcomponents = getComponents();
   if (subcomponents != 0) {
      List::Item* item = subcomponents->getFirstItem();
      while (item != 0) {
         Pair* pair = (Pair*)(item->getValue());
         Component* p = (Component*) pair->object();
         p->event(SHUTDOWN_EVENT);
         item = item->getNext();
      }
      subcomponents->unref();
      subcomponents = 0;
   }

   shutdown = true;
   return shutdown;
}

// -----------------------------------------------------------------
// reset() -- Resets the state machine
// -----------------------------------------------------------------
void StateMachine::reset()
{
   BaseClass::reset();

   // Reset our state machine list
   if (stMachList != nullptr) {
      List::Item* item = stMachList->getFirstItem();
      while (item != nullptr) {
         Pair* p = static_cast<Pair*>(item->getValue());
         Component* q = static_cast<Component*>(p->object());
         q->reset();
         item = item->getNext();
      }
   }

   // Goto our RESET state
   state = INVALID_STATE;
   substate = INVALID_STATE;
   stMach = nullptr;
   stMachName = nullptr;
   arg = nullptr;

   goTo(INIT_STATE);
}

//------------------------------------------------------------------------------
// processComponents() -- process our new components list; 
//   -- Add the components from the input list, 'list', to a new list, 'newList'
//      make sure they are all of type Component (or derived from it)
//      tell them that we are their container
//   -- Add an optional component to the end of the new list
//   -- Swap our 'components' list with the new list, newList
//   -- Handle selections.
//------------------------------------------------------------------------------
void Component::processComponents(
      PairStream* const list,
      const std::type_info& filter,
      Pair* const add,
      Component* const remove
   )
{
   PairStream* oldList = components.getRefPtr();

   // ---
   // Our dynamic_cast (see below) already filters on the Component class
   // ---
   bool skipFilter = false;
   if (&filter == 0) skipFilter = true;
   else if (filter == typeid(Component)) skipFilter = true;

   // ---
   // Create a new list, copy (filter) the component pairs and set their container pointers
   // ---
   PairStream* newList = new PairStream();
   if (list != 0) {

      // Add the (filtered) components to the new list and set their container
      List::Item* item = list->getFirstItem();
      while (item != 0) {
         Pair* pair = (Pair*) item->getValue();
         Component* cp = dynamic_cast<Component*>( pair->object() );
         if ( cp != 0 && cp != remove && (skipFilter || cp->isClassType(filter)) ) {
            newList->put(pair);
            cp->container(this);
         }
         else if ( cp != 0 && cp == remove ) {
            cp->container(0);
         }
         item = item->getNext();
      }

   }

   // ---
   // Add the optional component
   // ---
   if (add != 0) {
      Component* cp = dynamic_cast<Component*>( add->object() );
      if ( cp != 0 && (skipFilter || cp->isClassType(filter)) ) {
         newList->put(add);
         cp->container(this);
      }
   }

   // ---
   // Swap lists
   // ---
   components = newList;
   newList->unref();

   // ---
   // Anything selected?
   // ---
   if (selection != 0) {
      if (selection->isClassType(typeid(String))) {
            String str(*((String*)selection));
            select(&str);
      }
      else {
            Integer num(((Number*)selection)->getInt());
            select(&num);
      }
   }

   if (oldList != 0) {
      oldList->unref();
   }
}