URLHandler.h

#ifndef _URLHANDLER_H_
#define _URLHANDLER_H_

// Copyright (C) 2004 Dominic Letourneau

#include "Object.h"
#include <string>
#include <map>
#include "BaseException.h"
#include "net_types.h"

namespace FD {

typedef ObjectRef (*url_func)(const std::string &url, int flags);

class URLHandler {
  
 private:
  static std::map<std::string,url_func> &url_table();
  
 public:
  enum {
    URL_READ,
    URL_WRITE,
    URL_READWRITE
  };

  static int RegisterURLHandler(const std::string& name, url_func func) 
  {
    url_table()[name] = func;
    return 0;
  }
  
  static ObjectRef openStream(const std::string &inputURL, int flags)
  {

    try 
    {      
      int pos = inputURL.find(":");

      if (pos == std::string::npos) 
      {
        //default URL type is file: if nothing specified
        return url_table()["file"](inputURL, flags);
      }
      else
      {
        //cerr<<"tring to get url type : "<<inputURL.substr(0,pos)<<endl;

        if (url_table().find(inputURL.substr(0,pos)) != url_table().end())
        {
          return url_table()[inputURL.substr(0,pos)](inputURL, flags);
        }
        else
        {
          throw new GeneralException(std::string("Unable to create URL of type : ") + inputURL,__FILE__,__LINE__);
        }
      }
    }
    catch(BaseException *e) 
    {
      throw e->add(new GeneralException(std::string("Unable to create URL of type : ") + inputURL,__FILE__,__LINE__));
    }
  }   
};


#define REGISTER_URL_HANDLER(name, func) \
  int dummy_url_handler_for ## _ ## name = \
    URLHandler::RegisterURLHandler(# name,func);

}//using namespace FD

#endif

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