source: orxonox.OLD/orxonox/trunk/src/util/loading/load_param.h @ 4599

/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/

/*!
    \file load_param.h
    \brief A Class and macro-functions, that makes our lives easy to load-in parameters
*/

#ifndef _LOAD_PARAM_H
#define _LOAD_PARAM_H

#include "base_object.h"
#include "factory.h"
#include "debug.h"
#include "substring.h"
#include "tinyxml.h"

// Forward Declaration //
template<class T> class tList;

//! macro that makes it even more easy to load a Parameter
/**
   \param className the name of the class to load
   \param parameterName the name of the parameter to load as written in the XML-file
   \param function the function to call
*/
#define LOAD_PARAM(className, parameterName, paramFunction) \
        LoadParam<className>(root, #parameterName, this, &className::paramFunction)

/**
   useable FunctionParameters are:
   l_INT:       int
   l_LONG:      long
   l_SHORT:     short
   l_FLOAT:     float
   l_STRING:    const char*
   l_XML_ELEM:  TiXmlElement*
*/

#define l_INT_TYPE       int                  //!< The type of an INT
#define l_INT_FUNC       atoi                 //!< the function to call to parse INT
#define l_INT_NAME       "int"                //!< the name of an INT

#define l_LONG_TYPE      long                 //!< The type of a LONG
#define l_LONG_FUNC      atol                 //!< The function to parse a LONG
#define l_LONG_NAME      "long"               //!< The name of a LONG

#define l_SHORT_TYPE     short                //!< The type of a SHORT
#define l_SHORT_FUNC     atoi                 //!< The function to parse a SHORT
#define l_SHORT_NAME     "short"              //!< The name of a SHORT

#define l_FLOAT_TYPE     float                //!< The type of a FLOAT
#define l_FLOAT_FUNC     atof                 //!< The function to parse a FLOAT
#define l_FLOAT_NAME     "float"              //!< The name of a FLOAT

#define l_STRING_TYPE    const char*          //!< The type of a STRING
#define l_STRING_FUNC                         //!< The function to parse a STRING
#define l_STRING_NAME    "string"             //!< The name of a STRING

#define l_XML_ELEM_TYPE  const TiXmlElement*  //!< The type of an XML_ELEM
#define l_XML_ELEM_FUNC                       //!< The function to parse an XML_ELEM
#define l_XML_ELEM_NAME  "XML"                //!< The name of an XML_ELEM

// 1. TYPE
/**
   \brief a Macro to easily implement many different Constructors for the LoadParam-Class with 1 argument
   \param type1 The type of the first functionParameter
*/
#define LoadParam1(type1) \
 LoadParam(const TiXmlElement* root, const char* paramName, T* pt2Object, void(T::*function)(type1##_TYPE), bool multi = false) \
  : BaseLoadParam(root, pt2Object, paramName, 1, multi, NULL, type1##_NAME) \
    { \
      if (loadString != NULL && root != NULL) \
        (*pt2Object.*function)(type1##_FUNC(loadString)); \
      else \
        PRINTF(4)("Not loaded parameter %s of %s\n", paramName, pt2Object->getClassName()); \
    }


// 2. TYPES
/**
   \brief a Macro to easily implement many different Constructors for the LoadParam-Class with 2 arguments
   \param type1 The type of the first functionParameter
   \param type2 The type of the second functionParameter
*/
#define LoadParam2(type1, type2) \
 LoadParam(const TiXmlElement* root, const char* paramName, T* pt2Object, void(T::*function)(type1##_TYPE, type2##_TYPE), bool multi = false) \
  : BaseLoadParam(root, pt2Object, paramName, 2, multi, NULL, type1##_NAME, type2##_NAME) \
    { \
      if (loadString != NULL && root != NULL) \
        { \
          SubString subLoads(loadString); \
          if (subLoads.getCount() == 2) \
            (*pt2Object.*function)(type1##_FUNC(subLoads.getString(0)), type2##_FUNC(subLoads.getString(1))); \
          else \
            PRINTF(2)("Not loaded Parameter %s of %s, because wrong count of arguments.\n -> Should have %d but have %d\n", \
                      paramName, pt2Object->getClassName(), 2, subLoads.getCount()); \
        } \
      else \
        PRINTF(4)("Not loaded parameter %s of %s\n", paramName, pt2Object->getClassName()); \
    }


// 3. TYPES
/**
   \brief a Macro to easily implement many different Constructors for the LoadParam-Class with 3 arguments
   \param type1 The type of the first functionParameter
   \param type2 The type of the second functionParameter
   \param type3 The type of the third functionParameter
*/
#define LoadParam3(type1, type2, type3) \
 LoadParam(const TiXmlElement* root, const char* paramName, T* pt2Object, void(T::*function)(type1##_TYPE, type2##_TYPE, type3##_TYPE), bool multi = false)\
  : BaseLoadParam(root, pt2Object, paramName, 3, multi, NULL, type1##_NAME, type2##_NAME, type3##_NAME) \
    { \
      if (loadString != NULL && root != NULL) \
        { \
          SubString subLoads(loadString); \
          if (subLoads.getCount() == 3) \
            (*pt2Object.*function)(type1##_FUNC(subLoads.getString(0)), type2##_FUNC(subLoads.getString(1)), type3##_FUNC(subLoads.getString(2))); \
          else \
            PRINTF(2)("Not loaded Parameter %s of %s, because wrong count of arguments.\n -> Should have %d but have %d\n", \
                      paramName, pt2Object->getClassName(), 3, subLoads.getCount()); \
        } \
      else \
        PRINTF(4)("Not loaded parameter %s of %s\n", paramName, pt2Object->getClassName()); \
    }


// 4. TYPES
/**
   \brief a Macro to easily implement many different Constructors for the LoadParam-Class with 4 arguments
   \param type1 The type of the first functionParameter
   \param type2 The type of the second functionParameter
   \param type3 The type of the third functionParameter
   \param type4 The type of the forth functionParameter
*/
#define LoadParam4(type1, type2, type3, type4) \
 LoadParam(const TiXmlElement* root, const char* paramName, T* pt2Object, void(T::*function)(type1##_TYPE, type2##_TYPE, type3##_TYPE, type4##_TYPE), bool multi = false) \
  : BaseLoadParam(root, pt2Object, paramName, 4, multi, NULL, type1##_NAME, type2##_NAME, type3##_NAME, type2##_NAME, type4##_NAME) \
    { \
      if (loadString != NULL && root != NULL) \
        { \
          SubString subLoads(loadString); \
          if (subLoads.getCount() == 4) \
            (*pt2Object.*function)(type1##_FUNC(subLoads.getString(0)), type2##_FUNC(subLoads.getString(1)), type3##_FUNC(subLoads.getString(2)), type4##_FUNC(subLoads.getString(3))); \
          else \
            PRINTF(2)("Not loaded Parameter %s of %s, because wrong count of arguments.\n -> Should have %d but have %d\n", \
                      paramName, pt2Object->getClassName(), 4, subLoads.getCount()); \
        } \
      else \
        PRINTF(4)("Not loaded parameter %s of %s\n", paramName, pt2Object->getClassName()); \
    }


// 5. TYPES
/**
   \brief a Macro to easily implement many different Constructors for the LoadParam-Class with 5 arguments
   \param type1 The type of the first functionParameter
   \param type2 The type of the second functionParameter
   \param type3 The type of the third functionParameter
   \param type4 The type of the forth functionParameter
   \param type5 The type of the fifth functionParameter
*/
#define LoadParam5(type1, type2, type3, type4, type5) \
 LoadParam(const TiXmlElement* root, const char* paramName, T* pt2Object, void(T::*function)(type1##_TYPE, type2##_TYPE, type3##_TYPE, type4##_TYPE, type5##_TYPE), bool multi = false) \
  : BaseLoadParam(root, pt2Object, paramName, 5, multi, NULL, type1##_NAME, type2##_NAME, type3##_NAME, type2##_NAME, type4##_NAME, type5##_NAME) \
    { \
      if (loadString != NULL && root != NULL) \
        { \
          SubString subLoads(loadString); \
          if (subLoads.getCount() == 5) \
            (*pt2Object.*function)(type1##_FUNC(subLoads.getString(0)), type2##_FUNC(subLoads.getString(1)), type3##_FUNC(subLoads.getString(2)), type4##_FUNC(subLoads.getString(3)), type5##_FUNC(subLoads.getString(4))); \
          else \
            PRINTF(2)("Not loaded Parameter %s of %s, because wrong count of arguments.\n -> Should have %d but have %d\n", \
                      paramName, pt2Object->getClassName(), 5, subLoads.getCount()); \
        } \
      else \
        PRINTF(4)("Not loaded parameter %s of %s\n", paramName, pt2Object->getClassName()); \
    }

// Pointer TYPE
/**
   \brief a Macro to easily implement many different Constructors for the LoadParam-Class with 1 argument
   \param type1 The type of the Pointer
 */
#define LoadParamPT(type1) \
 LoadParam(const TiXmlElement* root, const char* paramName, T* pt2Object, void(T::*function)(type1##_TYPE), type1##_TYPE pointerToParam, bool multi = false) \
  : BaseLoadParam(root, pt2Object, paramName, 1, multi, pointerToParam, type1##_NAME) \
{ \
      if (pointerToParam != NULL && root != NULL) \
        (*pt2Object.*function)((type1##_TYPE) pointerToParam); \
      else \
        PRINTF(4)("Not loaded parameter %s of %s\n", paramName, pt2Object->getClassName()); \
}

//! A class that handles the description of loadable parameters
class LoadParamDescription
{
  friend class BaseLoadParam;
  friend class LoadClassDescription;
 public:
  LoadParamDescription(const char* paramName);
  ~LoadParamDescription(void);

  void setDescription(const char* descriptionText);
  /** \returns the descriptionString */
  const char* getDescription(void) { return this->description; };

  void print(void) const;
 private:
  char*         paramName;             //!< The name of the parameter
  int           paramCount;            //!< The count of parameters
  char**        types;                 //!< What kind of parameters does this function take ??
  char*         description;           //!< A longer description about this function
};

//! A class for descriptions of a loadable module
class LoadClassDescription
{
  friend class BaseLoadParam;
 public:
  LoadClassDescription(const char* className);
  ~LoadClassDescription(void);

  static LoadClassDescription* addClass(const char* className);
  LoadParamDescription* addParam(const char* paramName);


  static void printAll(const char* fileName = NULL);

 private:
  static bool                          parametersDescription;  //!< if parameter-description should be enabled.
  static tList<LoadClassDescription>*  classList;              //!< a list, that holds all the loadable classes. (after one instance has been loaded)
  char*                                className;              //!< name of the class
  tList<LoadParamDescription>*         paramList;              //!< List of parameters this class knows.
};

//! abstract Base class for a Loadable parameter
class BaseLoadParam : public BaseObject
{
 public:
  BaseLoadParam* describe(const char* descriptionText);

 protected:
  BaseLoadParam(const TiXmlElement* root, BaseObject* object, const char* paramName, int paramCount, bool multi, const void* pointerToParam, ...);

 protected:
  LoadClassDescription*    classDesc;            //!< The LoadClassDescription of this LoadParameter
  LoadParamDescription*    paramDesc;            //!< The LoadParameterDescription of this LoadParameter
  const char*              loadString;           //!< The string loaded by this LoadParam
  const void*              pointerToParam;       //!< A Pointer to a Parameter.
};


//! derived template class, so all the Classes can load something.
template<class T> class LoadParam : public BaseLoadParam
{
 public:
  LoadParam(const TiXmlElement* root, const char* paramName, T* pt2Object, void(T::*function)(), bool multi = false)
    : BaseLoadParam(root, pt2Object, paramName, 0, multi, NULL, "")
    {
      if (loadString != NULL && root != NULL)
        (*pt2Object.*function)();
      else
        PRINTF(4)("Not loaded parameter %s of %s\n", paramName, pt2Object->getClassName());
    }


  //! makes functions with one string loadable
  LoadParam1(l_STRING);
  //! makes functions with two strings loadable
  LoadParam2(l_STRING, l_STRING);
  //! makes functions with three strings loadable
  LoadParam3(l_STRING, l_STRING, l_STRING);
  //! makes functions with four strings loadable
  LoadParam4(l_STRING, l_STRING, l_STRING, l_STRING);

  //! makes functions with one int loadable
  LoadParam1(l_INT);
  //! makes functions with two ints loadable
  LoadParam2(l_INT, l_INT);
  //! makes functions with three ints loadable
  LoadParam3(l_INT, l_INT, l_INT);
  //! makes functions with four ints loadable
  LoadParam4(l_INT, l_INT, l_INT, l_INT);

  //! makes functions with one float loadable
  LoadParam1(l_FLOAT);
  //! makes functions with two floats loadable
  LoadParam2(l_FLOAT, l_FLOAT);
  //! makes functions with three floats loadable
  LoadParam3(l_FLOAT, l_FLOAT, l_FLOAT);
  //! makes functions with four floats loadable
  LoadParam4(l_FLOAT, l_FLOAT, l_FLOAT, l_FLOAT);


  LoadParam(const TiXmlElement* root, const char* paramName, T* pt2Object, void(T::*function)(const TiXmlElement*), bool multi = false)
  : BaseLoadParam(root, pt2Object, paramName, 1, multi, NULL, "XML-Element")
  {
    if (root != NULL)
    {
      const TiXmlElement* elem = root->FirstChildElement(paramName);
      if (likely(elem != NULL))
        (*pt2Object.*function)(elem);
      else
        PRINTF(2)("%s of %s is empty", paramName, pt2Object->getClassName());
    }
    else
      PRINTF(4)("Not loaded parameter %s of %s\n", paramName, pt2Object->getClassName());
  }

  //LoadParamPT(l_XML_ELEM);
};

// helper function

const char* grabParameter(const TiXmlElement* root, const char* parameterName);

#endif /* _LOAD_PARAM_H */