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csutil/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/scf.h"
00028 #include "csutil/ref.h"
00029 #include "iutil/object.h"
00030 
00034 template<typename T> 
00035 class csTypedObjectIterator
00036 {
00037 protected:
00038   csRef<iObjectIterator> iter;
00039   csRef<T> CurrentTypedObject;
00040 
00041   void FetchObject()
00042   {
00043     CurrentTypedObject.Invalidate();
00044     while (iter->HasNext())
00045     {
00046       CurrentTypedObject = scfQueryInterface<T> (iter->Next());
00047       if (CurrentTypedObject.IsValid())
00048         return;
00049     }
00050   }
00051 
00052 public:
00054   csTypedObjectIterator(iObject* parent)
00055   {
00056     iter = parent->GetIterator();
00057     FetchObject();
00058   }
00059 
00061   ~csTypedObjectIterator() {}
00062 
00064   T* Next()
00065   {
00066     T* cur = CurrentTypedObject;
00067     FetchObject();
00068     return (T*)cur;
00069   }
00070 
00072   void Reset() { iter->Reset(); FetchObject(); }
00073 
00075   iObject* GetParentObj() const { return iter->GetParentObj(); }
00076 
00078   bool HasNext() const { return CurrentTypedObject.IsValid(); }
00079 
00081   T* FindName (const char* name)
00082   {
00083     iObject* obj = iter->FindName(name);
00084     if (obj != 0)
00085       CurrentTypedObject = scfQueryInterface<T> (obj);
00086     else
00087       CurrentTypedObject.Invalidate();
00088     return (T*)CurrentTypedObject;
00089   }
00090 };
00091 
00092 #endif // __CS_OBJITER_H__

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