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parammap.h

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#ifndef ___PARAMMAP_H___
#define ___PARAMMAP_H___

#include "polymorph.h"
#include "pointerlookup.h"
#include "msg.h"


class ParamMap : public PointerLookup<Typeless> {
public:
  typedef  ParamMap self;
  virtual ~ParamMap() { }
  
  template <class T>
  const T* get(const char* name, T*& x,
               const bool warn=true, const bool warn_unknown=true) const {

    const Typeless*     p  = getptr(name);
    const Polymorph<T>* pp = dynamic_cast<const Polymorph<T>*>(p);
    
    if (warn_unknown && !pp)
      message(Msg::Error,"ParamMap: No parameter (or constant) `" +
              string(name) + "' is defined");
    
    else if (warn && p && !pp)
      message(Msg::Error,"ParamMap: Parameter `" +
              string(name) + "' does not have the expected type");
    
    return x = (pp ? pp->valueptr() : 0);
  }
  
  
  template <class T>
  T get_with_default(const char* name, const T& default_val,
                     const bool warn=true, const bool warn_unknown=false) const {
    T* p=0;
    get(name,p,warn,warn_unknown);
    return (p ? *p : default_val);
  }

  virtual ParamMap* new_child(const string name_="", const bool owned=false)=0;
    
  virtual const ParamMap& get_child(const string& name_="") const=0;
  virtual       ParamMap& get_child(const string& name_="")=0;
    
private:
  virtual void message(Msg::MessageLevel, const string&) const { };
};


#endif /* ___PARAMMAP_H___ */

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