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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> class csTypedObjectIterator
00034 {
00035 protected:
00036   scfInterfaceID scf_id;
00037   int scf_ver;
00038   csRef<iObjectIterator> iter;
00039   csRef<iBase> CurrentTypedObject;
00040 
00041   void FetchObject()
00042   {
00043     CurrentTypedObject.Invalidate();
00044     while (iter->HasNext())
00045     {
00046       CurrentTypedObject =
00047         csPtr<iBase>((iBase*)(iter->Next()->QueryInterface(scf_id, scf_ver)));
00048       if (CurrentTypedObject.IsValid())
00049         return;
00050     }
00051   }
00052 
00053 public:
00055   csTypedObjectIterator(iObject* parent)
00056   {
00057     scf_id = scfInterface<T>::GetID();
00058     scf_ver = scfInterface<T>::GetVersion();
00059     iter = parent->GetIterator();
00060     FetchObject();
00061   }
00062 
00064   ~csTypedObjectIterator() {}
00065 
00067   T* Next()
00068   {
00069     iBase* cur = CurrentTypedObject;
00070     FetchObject();
00071     return (T*)cur;
00072   }
00073 
00075   void Reset() { iter->Reset(); FetchObject(); }
00076 
00078   iObject* GetParentObj() const { return iter->GetParentObj(); }
00079 
00081   bool HasNext() const { return CurrentTypedObject.IsValid(); }
00082 
00084   T* FindName (const char* name)
00085   {
00086     iObject* obj = iter->FindName(name);
00087     if (obj != 0)
00088       CurrentTypedObject.AttachNew(
00089         (iBase*)(obj->QueryInterface(scf_id, scf_ver)));
00090     else
00091       CurrentTypedObject.Invalidate();
00092     return (T*)(iBase*)CurrentTypedObject;
00093   }
00094 };
00095 
00096 #endif // __CS_OBJITER_H__

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