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dsDataAccessor.h

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/*
 * $Id: dsDataAccessor.h,v 1.7 2004/06/10 10:58:17 dsamersoff Exp $
 */

#ifndef dsDataAccessor_h 
#define dsDataAccessor_h 

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <dsSmartException.h>
#include <dsutil.h>

DECLARE_EXCEPTION(dsDataAccessor);

class dsDataAccessorItem 
{
public:
    void *body;

    dsDataAccessorItem() { body = 0; }
    dsDataAccessorItem(void *xbody) { body = xbody; }
};

class dsDataPair
{

   bool _copy_value;

public:
   char *key;
   void *val;
   size_t vsize;
      

   dsDataPair()
    { key = 0;
      val = 0; 
      vsize = 0;
    }

   dsDataPair(const char *xkey, void *xval)
    { 
      key = ds_strdup(xkey); 
      val = xval; 
      vsize = 0;
      _copy_value = false; 
      
    }

   dsDataPair(const char *xkey, const char *xval)
    { 
      key = ds_strdup(xkey); 
      val = ds_strdup(xval);
      vsize = strlen(xval)+1;
      _copy_value = true; 
      
    }

   dsDataPair(const char *xkey, const void *xval, size_t size)
    { 
      key = ds_strdup(xkey); 
      val = new char[size];
      memmove(val,xval,size);
      vsize = size;

      _copy_value = true; 
      
    }



   dsDataPair(const char *xkey)
    { 
      key = ds_strdup(xkey); 
      val = 0; 
      vsize = 0;
      _copy_value = false; 
    }


   ~dsDataPair()
    {  if ( key )
                delete[] key;
       if (val && _copy_value)
               delete (char *)val;
    }  

};


class dsDataAccessor 
{

protected:

   enum DACleanupMode 
   {
     cmPASSIVE, 
     cmPURGE    
   };

   DACleanupMode _purge; 

   dsDataAccessor(DACleanupMode purge)
   { _purge = purge;
   }

    virtual  void *insert(void * a, bool replace) = 0;
    
    virtual void *remove(void * a) = 0;

    virtual void* seek(void *a) = 0;

    virtual void *walk(){ return 0; }
};

#endif

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