src/factory_filter.cpp

   1 /* $Id: factory_filter.cpp,v 1.2 2006-01-05 16:39:37 adam Exp $
   2    Copyright (c) 2005, Index Data.
   3
   4 %LICENSE%
   5  */
   6
   7 #include "config.hpp"
   8
   9 #include "factory_filter.hpp"
  10
  11 #if HAVE_DLFCN_H
  12 #include <dlfcn.h>
  13 #endif
  14 #include <stdexcept>
  15 #include <iostream>
  16 #include <string>
  17 #include <map>
  18
  19 namespace yp2 {
  20     class FactoryFilter::Rep {
  21         typedef std::map<std::string, CreateFilterCallback> CallbackMap;
  22         typedef std::map<std::string, CreateFilterCallback>::iterator
  23             CallbackMapIt;
  24     public:
  25         friend class FactoryFilter;
  26         CallbackMap m_fcm;
  27         Rep();
  28         ~Rep();
  29     };
  30 }
  31
  32 yp2::FactoryFilter::NotFound::NotFound(const std::string message)
  33     : std::runtime_error(message)
  34 {
  35 }
  36
  37 yp2::FactoryFilter::Rep::Rep()
  38 {
  39 }
  40
  41 yp2::FactoryFilter::Rep::~Rep()
  42 {
  43 }
  44
  45 yp2::FactoryFilter::FactoryFilter() : m_p(new yp2::FactoryFilter::Rep)
  46 {
  47
  48 }
  49
  50 yp2::FactoryFilter::~FactoryFilter()
  51 {
  52
  53 }
  54
  55 bool yp2::FactoryFilter::add_creator(std::string fi,
  56                                      CreateFilterCallback cfc)
  57 {
  58     return m_p->m_fcm.insert(Rep::CallbackMap::value_type(fi, cfc)).second;
  59 }
  60
  61
  62 bool yp2::FactoryFilter::drop_creator(std::string fi)
  63 {
  64     return m_p->m_fcm.erase(fi) == 1;
  65 }
  66
  67 yp2::filter::Base* yp2::FactoryFilter::create(std::string fi)
  68 {
  69     Rep::CallbackMap::const_iterator it = m_p->m_fcm.find(fi);
  70
  71     if (it == m_p->m_fcm.end()){
  72         std::string msg = "filter type '" + fi + "' not found";
  73             throw NotFound(msg);
  74     }
  75     // call create function
  76     return (it->second());
  77 }
  78
  79 #if HAVE_DLFCN_H
  80 bool yp2::FactoryFilter::add_creator_dyn(const std::string &fi,
  81                                          const std::string &path)
  82 {
  83     if (m_p->m_fcm.find(fi) != m_p->m_fcm.end())
  84     {
  85         return true;
  86     }
  87
  88     std::string full_path = path + "/yp2_filter_" + fi + ".so";
  89     void *dl_handle = dlopen(full_path.c_str(), RTLD_GLOBAL|RTLD_NOW);
  90     if (!dl_handle)
  91     {
  92         const char *dl = dlerror();
  93         std::cout << "dlopen " << full_path << " failed. dlerror=" << dl <<
  94             std::endl;
  95         return false;
  96     }
  97
  98     std::string full_name = "yp2_filter_" + fi;
  99
 100     void *dlsym_ptr = dlsym(dl_handle, full_name.c_str());
 101     if (!dlsym_ptr)
 102     {
 103         std::cout << "dlsym " << full_name << " failed\n";
 104         return false;
 105     }
 106     struct yp2_filter_struct *s = (struct yp2_filter_struct *) dlsym_ptr;
 107     return add_creator(fi, s->creator);
 108 }
 109 #endif
 110
 111 /*
 112  * Local variables:
 113  * c-basic-offset: 4
 114  * indent-tabs-mode: nil
 115  * c-file-style: "stroustrup"
 116  * End:
 117  * vim: shiftwidth=4 tabstop=8 expandtab
 118  */