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//
// $Id$
//
// Jane Tinslay September 2006
//
// Visualisation attribute utility functions.
//
#ifndef G4ATTUTILS_HH
#define G4ATTUTILS_HH

#include "globals.hh"
#include "G4AttDef.hh"
#include "G4AttValue.hh"
#include "G4String.hh"
#include "G4TypeKey.hh"
#include <map>
#include <vector>

namespace G4AttUtils {
    
  namespace {

    // Utility class
    template <typename T>
    class HasName {
    public:
      HasName(const G4String& name): fName(name) {};
      bool operator()(const T& value) const
      {return value.GetName() == fName;}
    private:
      G4String fName;
    };

  }
  
  // Extract attribute definition with given name
  template <typename T> 
  G4bool ExtractAttDef(const T& object, const G4String& name, G4AttDef& def) 
  {
    const std::map<G4String, G4AttDef>* attDefs = object.GetAttDefs();

    std::map<G4String, G4AttDef>::const_iterator iter = attDefs->find(name);
    if (iter == attDefs->end()) return false;    
    
    def = iter->second;
    
    return true;
  }
  
  // Extract attribute value with given name
  template <typename T>
  G4bool ExtractAttValue(const T& object, const G4String& name, G4AttValue& attVal) 
  {
    std::vector<G4AttValue>* attValues = object.CreateAttValues();
    
    std::vector<G4AttValue>::iterator iter = std::find_if(attValues->begin(), attValues->end(), 
                                                          HasName<G4AttValue>(name));
    if (iter == attValues->end()) return false;
    
    attVal = *iter;
    
    // Clean up
    delete attValues;

    return true;
  }

  // Get G4TypeKey information for old style G4AttDef's
  G4TypeKey GetKey(const G4AttDef& def);

}

#endif
