tunableConst.h

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/*
 * tunableConstant - a constant that might be changed during execution.
 *
 * $Log: tunableConst.h,v $
 * Revision 1.10  1994/12/21 07:10:06  tamches
 * Made the "allConstants" variable protected and added a few member
 * functions to let outside code access it (safely) in a manner useful
 * for doing iterations through all tunable-constants.
 *
 * Revision 1.9  1994/12/21  00:31:44  tamches
 * Greatly cleaned up the interface; no data members are public any more.
 * Also some minor changes, such as using g++'s built-in "bool" instead
 * of "Boolean".
 *
 * Revision 1.8  1994/11/04  15:52:51  tamches
 * setValue() for boolean tc's now correctly invokes its callback function, if any.
 *
 * Revision 1.7  1994/11/01  16:07:35  markc
 * Added Object classes that provide os independent symbol tables.
 * Added stl-like container classes with iterators.
 *
 * Revision 1.6  1994/10/26  22:32:50  tamches
 * Defaulted min&max to 0 for floats with no min/max in constructor.
 * Wrote min() and max() functions.
 * Wrote use() function
 * other minor changes to get to work with new tclTunable code
 *
 * Revision 1.5  1994/09/22  03:15:59  markc
 * changed char* to const char *
 *
 * Revision 1.4  1994/08/05  16:01:55  hollings
 * More consistant use of stringHandle vs. char *.
 *
 * Revision 1.3  1994/08/03  18:37:30  hollings
 * split tunable constant into Boolean and Float sub-classes.
 *
 * Revision 1.2  1994/02/28  23:58:28  hollings
 * Changed global list to be a pointer to a list because I couldn't rely on
 * the order of global constructors.
 *
 * Revision 1.1  1994/02/25  00:25:58  hollings
 * added tunable constants.
 *
 *
 */
#ifndef TUNABLE_CONST_H
#define TUNABLE_CONST_H

#include <assert.h>
#include "util/h/stringPool.h"
#include "util/h/list.h"

typedef enum tunableUse { developerConstant, userConstant };
typedef enum tunableType { tunableBoolean, tunableFloat };

//
// Note: this is an abstract class, and can NOT be directly created.
//
class tunableConstant {
 protected:
   char *desc;
   char *name;
   tunableType typeName;
   tunableUse use;

   static stringPool *pool; // made protected

   static List<tunableConstant*> *allConstants; // NEEDS TO BE MADE PROTECTED

 public:
   tunableConstant() {}
   virtual ~tunableConstant() {}

   const char *getDesc() const {
      return desc;
   }
   const char *getName() const {
      return name;
   }
   tunableUse getUse() const {
      return use;
   }
   tunableType getType() const {
      return typeName;
   }

   static tunableConstant *findTunableConstant(const char *name);
      // returns NULL if not found

   static List<tunableConstant *> beginIteration() {
      assert(allConstants);

      List <tunableConstant *> iterList = *allConstants;
         // make a copy of the list for iteration purposes
         // (actually, it just copies the head element, which itself
         // is merely a pointer)

      return iterList;
   }

   static int numTunables() {
      assert(allConstants);
      return allConstants->count();
   }

   virtual void print() = NULL;
};


// Shouldn't the string pools be made part of the base class?

typedef bool (*isValidFunc)(float newVal);
typedef void (*booleanChangeValCallBackFunc)(bool value);
typedef void (*floatChangeValCallBackFunc)(float value);

class tunableBooleanConstant : public tunableConstant {
 private:
   bool value;
   booleanChangeValCallBackFunc newValueCallBack;

 public:

   tunableBooleanConstant(bool initialValue, 
              booleanChangeValCallBackFunc cb,
              tunableUse type,
              const char *name,
              const char *desc);
   bool getValue() { return value; }
   bool setValue(bool newVal) {
      value = newVal;
      if (newValueCallBack)
         newValueCallBack(newVal);
      return true;
   }

   virtual void print();
};

class tunableFloatConstant : public tunableConstant {
 private:
   float value;
   float min, max;
   isValidFunc isValidValue;

   floatChangeValCallBackFunc newValueCallBack;
   bool simpleRangeCheck(float val);

 public:

   tunableFloatConstant(float initialValue, 
            float min, 
            float max, 
            floatChangeValCallBackFunc cb,
                tunableUse type,
            const char *name,
            const char *desc);
   tunableFloatConstant(float initialValue, 
            isValidFunc, 
            floatChangeValCallBackFunc cb,
                tunableUse type,
            const char *name,
            const char *desc);
   float getValue() { return value; }
   bool setValue(float newVal) {
      if (isValidValue && isValidValue(newVal)) {
     value = newVal;
     if (newValueCallBack)
            newValueCallBack(newVal);
     return true;
      }
      else if (simpleRangeCheck(newVal)) {
         value = newVal;
     if (newValueCallBack)
            newValueCallBack(newVal);
     return true;
      }
      else
         return false;
   }

   float getMin() {return min;}
   float getMax() {return max;}

   virtual void print();
};

#endif