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objiter.h

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00001 /*
00002     Copyright (C) 2001 by Martin Geisse <mgeisse@gmx.net>
00003 
00004     This library is free software; you can redistribute it and/or
00005     modify it under the terms of the GNU Library General Public
00006     License as published by the Free Software Foundation; either
00007     version 2 of the License, or (at your option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful,
00010     but WITHOUT ANY WARRANTY; without even the implied warranty of
00011     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012     Library General Public License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public
00015     License along with this library; if not, write to the Free
00016     Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
00017 */
00018 
00023 #ifndef __CS_OBJITER_H__
00024 #define __CS_OBJITER_H__
00025 
00026 #include "csextern.h"
00027 #include "csutil/ref.h"
00028 #include "iutil/object.h"
00029 
00033 template<typename T> 
00034 class csTypedObjectIterator
00035 {
00036 protected:
00037   scfInterfaceID scf_id;
00038   int scf_ver;
00039   csRef<iObjectIterator> iter;
00040   csRef<T> CurrentTypedObject;
00041 
00042   void FetchObject()
00043   {
00044     CurrentTypedObject.Invalidate();
00045     while (iter->HasNext())
00046     {
00047       CurrentTypedObject =
00048         csPtr<T>((T*)(iter->Next()->QueryInterface(scf_id, scf_ver)));
00049       if (CurrentTypedObject.IsValid())
00050         return;
00051     }
00052   }
00053 
00054 public:
00056   csTypedObjectIterator(iObject* parent)
00057   {
00058     scf_id = scfInterfaceTraits<T>::GetID();
00059     scf_ver = scfInterfaceTraits<T>::GetVersion();
00060     iter = parent->GetIterator();
00061     FetchObject();
00062   }
00063 
00065   ~csTypedObjectIterator() {}
00066 
00068   T* Next()
00069   {
00070     iBase* cur = CurrentTypedObject;
00071     FetchObject();
00072     return (T*)cur;
00073   }
00074 
00076   void Reset() { iter->Reset(); FetchObject(); }
00077 
00079   iObject* GetParentObj() const { return iter->GetParentObj(); }
00080 
00082   bool HasNext() const { return CurrentTypedObject.IsValid(); }
00083 
00085   T* FindName (const char* name)
00086   {
00087     iObject* obj = iter->FindName(name);
00088     if (obj != 0)
00089       CurrentTypedObject.AttachNew(
00090         (T*)(obj->QueryInterface(scf_id, scf_ver)));
00091     else
00092       CurrentTypedObject.Invalidate();
00093     return (T*)CurrentTypedObject;
00094   }
00095 };
00096 
00097 #endif // __CS_OBJITER_H__

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