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//
// $Id$
//

#ifndef G4UImessenger_h
#define G4UImessenger_h 1

#include "globals.hh"
#include "G4ios.hh"
#include "G4UIdirectory.hh"

// class description:
//
//  This class is the base class which represents a messenger which maintains
// the commands. The user who wants to define some commands must create his/her
// own concrete class derived from this class. The user's concrete messenger
// must have a responsibility of creating and deleting commands. Also, it must
// take care the delivering of the command to the destination class and replying
// the current value(s) of the parameter(s).
//

class G4UImessenger 
{
  public: // with description
      G4UImessenger();
      G4UImessenger(const G4String& path, const G4String& dsc);
      // Constructor. In the implementation of the concrete messenger, all commands
      // related to the messenger must be constructed.
      virtual ~G4UImessenger();
      // Destructor. In the implementation of the concrete messenger, all commands
      // defined in the constructor must be deleted.
      virtual G4String GetCurrentValue(G4UIcommand * command);
      // The concrete implementation of this method gets the current value(s) of the
      // parameter(s) of the given command from the destination class, converts the
      // value(s) to a string, and returns the string. Conversion could be done by
      // the ConvertToString() method of corresponding G4UIcmdXXX classes if the
      // the command is an object of these G4UIcmdXXX classes.
      virtual void SetNewValue(G4UIcommand * command,G4String newValue);
      // The concrete implementation of this method converts the string "newValue"
      // to value(s) of type(s) of the parameter(s). Convert methods corresponding
      // to the type of the command can be used if the command is an object of
      // G4UIcmdXXX classes.

  public:
      G4bool operator == (const G4UImessenger& messenger) const;

  protected:
      G4String ItoS(G4int i);
      G4String DtoS(G4double a);
      G4String BtoS(G4bool b);
      G4int    StoI(G4String s);
      G4double StoD(G4String s);
      G4bool   StoB(G4String s);

  protected:
      void AddUIcommand(G4UIcommand * newCommand);
  
      // shortcut way for creating directory and commands
      G4UIdirectory* baseDir; // used if new object is created
      G4String baseDirName;   // used if dir already exists
      void CreateDirectory(const G4String& path, const G4String& dsc);
      template <typename T> T* CreateCommand(const G4String& cname, 
                                             const G4String& dsc);

};

template <typename T>
T* G4UImessenger::CreateCommand(const G4String& cname, const G4String& dsc)
{
  G4String path;
  if( cname(0) != '/' ) {
    path = baseDirName + cname;
    if (path(0) != '/') path = "/" + path;
  }

  T* command = new T(path.c_str(), this);
  command-> SetGuidance(dsc.c_str());

  return command;
}

#endif