summaryrefslogtreecommitdiffstats
path: root/ksim/library/pluginloader.cpp
blob: 21267909cfca3cb36309575fa51da946e9322607 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*  ksim - a system monitor for kde
 *
 *  Copyright (C) 2001  Robbie Ward <linuxphreak@gmx.co.uk>
 *
 *  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 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include "pluginloader.h"
#include "pluginloader.moc"

#include <kdebug.h>
#include <klibloader.h>
#include <kdesktopfile.h>
#include <klocale.h>
#include <kglobal.h>
#include <kstandarddirs.h>
#include <kmessagebox.h>

#include <tqstringlist.h>

class KSim::PluginInfo::Private
{
  public:
};

KSim::PluginInfo::~PluginInfo()
{
}

const TQString &KSim::PluginInfo::name() const
{
  return m_name;
}

TQCString KSim::PluginInfo::libName(bool includePrefix) const
{
  return (includePrefix ? "ksim_" + m_libName : m_libName);
}

const TQString &KSim::PluginInfo::location() const
{
  return m_location;
}

KSim::PluginInfo::PluginInfo()
{
}

class KSim::PluginLoader::Private
{
  public:
    typedef KSim::PluginObject *(PluginPtr)(const char *);
    KSim::PluginList pluginList;
    TQString error;
    TQString lib;
    bool lastLoaded;
    static const char *const ksimString;
};

const char *const KSim::PluginLoader::Private::ksimString = "ksim_";

KSim::PluginLoader *KSim::PluginLoader::m_instance = 0; // initialize pointer
KSim::PluginLoader &KSim::PluginLoader::self()
{
  if (!m_instance) // is it the first call?
    m_instance = new PluginLoader; // create sole instance

  return *m_instance; // address of sole instance
}

KSim::PluginLoader::~PluginLoader()
{
  unloadAllPlugins();
  delete d;
}

bool KSim::PluginLoader::loadPlugin(const KDesktopFile &file)
{
  switch (createPlugin(file)) {
    case KSim::PluginLoader::EmptyLibName:
      KMessageBox::error(0, i18n("KSim was unable to load the plugin %1"
            " due to the X-KSIM-LIBRARY property being empty in the"
            " plugins desktop file").arg(file.readName()));
      return false;
      break;
    case KSim::PluginLoader::LibNotFound:
      KMessageBox::error(0, i18n("KSim was unable to load the plugin %1"
            " due to not being able to find the plugin, check that the plugin"
            " is installed and is in your $TDEDIR/lib path").arg(file.readName()));
      return false;
      break;
    case KSim::PluginLoader::UnSymbols:
      KMessageBox::error(0, i18n("<qt>An error occurred while trying \n"
            "to load the plugin '%1'. \nThis could be caused by the"
            " following:<ul>\n<li>The plugin doesn't have the %2"
            " macro</li>\n<li>The plugin has been damaged or has"
            " some unresolved symbols</li>\n</ul> \nLast"
            " error message that occurred: \n%3</qt>")
            .arg(d->lib.prepend("ksim_")).arg("KSIM_INIT_PLUGIN")
            .arg(d->error));
      return false;
      break;
    default:
      break;
  }

  return true;
}

bool KSim::PluginLoader::unloadPlugin(const TQCString &name)
{
  if (name.isEmpty())
    return false;

  // see if our plugin is loaded
  KSim::Plugin plugin = find(name);
  if (plugin.isNull())
    return false;

  // try to unload the library
  kdDebug(2003) << "Unloading plugin " << plugin.libName() << endl;
  KLibLoader::self()->unloadLibrary(plugin.libName());
  d->pluginList.remove(plugin);
  return true;
}

void KSim::PluginLoader::unloadAllPlugins()
{
  kdDebug(2003) << "Unloading all plugins" << endl;

  // Go through the plugin list and unload each plugin;
  KSim::PluginList::ConstIterator it;
  for (it = d->pluginList.begin(); it != d->pluginList.end(); ++it) {
    KLibLoader::self()->unloadLibrary((*it).libName());
  }

  // Clear the plugin list;
  d->pluginList.clear();
  KLibLoader::cleanUp();
}

bool KSim::PluginLoader::isLoaded(const KSim::Plugin &info) const
{
  return isLoaded(info.libName());
}

bool KSim::PluginLoader::isLoaded(const TQCString &library) const
{
  if (library.isEmpty())
    return false;

  return !find(library).isNull();
}

KSim::PluginInfo KSim::PluginLoader::findPluginInfo(const TQString &name,
   SearchType type) const
{
  TQString location;

  switch (type) {
    case Name: {
      TQStringList files = TDEGlobal::dirs()->findAllResources("data", "ksim/monitors/*.desktop");
      TQStringList::ConstIterator it;
      for (it = files.begin(); it != files.end(); ++it) {
        KDesktopFile file((*it));
        if (file.readName() == name) {
          location = (*it);
          break;
        }
      }
      break;
    }
    case LibName: {
      TQStringList files = TDEGlobal::dirs()->findAllResources("data", "ksim/monitors/*.desktop");
      TQStringList::ConstIterator it;
      for (it = files.begin(); it != files.end(); ++it) {
        KDesktopFile file((*it));
        if (file.readEntry("X-KSIM-LIBRARY") == name) {
          location = (*it);
          break;
        }
      }
      break;
    }
    case DesktopFile: {
      if (!KDesktopFile::isDesktopFile(name))
      return KSim::PluginInfo();

      location = name;
      break;
    }
  }

  KDesktopFile file(location);
  KSim::PluginInfo info;
  info.m_name = file.readName();
  info.m_libName = file.readEntry("X-KSIM-LIBRARY").local8Bit();
  info.m_location = location;
  return info;
}

KSim::Plugin &KSim::PluginLoader::find(const TQCString &libName)
{
  if (libName.isEmpty())
    return KSim::Plugin::null;

  TQCString library(libName);
  if (libName.find(Private::ksimString) == -1)
    library.prepend(Private::ksimString);

  KSim::PluginList::Iterator it;
  for (it = d->pluginList.begin(); it != d->pluginList.end(); ++it) {
    if ((*it).libName() == library)
      return (*it);
  }

  return KSim::Plugin::null;
}

const KSim::Plugin &KSim::PluginLoader::find(const TQCString &libName) const
{
  if (libName.isEmpty())
    return KSim::Plugin::null;

  TQCString library(libName);
  if (libName.find(Private::ksimString) == -1)
    library.prepend(Private::ksimString);

  KSim::PluginList::ConstIterator it;
  for (it = d->pluginList.begin(); it != d->pluginList.end(); ++it) {
    if ((*it).libName() == library)
      return (*it);
  }

  return KSim::Plugin::null;
}

KSim::Plugin &KSim::PluginLoader::find(const KSim::PluginInfo &info)
{
  return find(info.libName());
}

const KSim::Plugin &KSim::PluginLoader::find(const KSim::PluginInfo &info) const
{
  return find(info.libName());
}

const KSim::PluginList &KSim::PluginLoader::pluginList() const
{
  return d->pluginList;
}

KSim::PluginList &KSim::PluginLoader::pluginList()
{
  return d->pluginList;
}

const KSim::Plugin &KSim::PluginLoader::plugin() const
{
  return (d->lastLoaded ? d->pluginList.last() : KSim::Plugin::null);
}

KSim::Plugin &KSim::PluginLoader::plugin()
{
  return (d->lastLoaded ? d->pluginList.last() : KSim::Plugin::null);
}

KSim::PluginLoader::PluginLoader() : TQObject(0, "PluginLoader")
{
  d = new KSim::PluginLoader::Private;
  d->lastLoaded = false;
}

void KSim::PluginLoader::cleanup()
{
  if (!m_instance)
    return;

  delete m_instance;
  m_instance = 0;
}

KSim::PluginLoader::ErrorCode KSim::PluginLoader::createPlugin(const KDesktopFile &file)
{
  d->error = TQString();
  TQCString pluginName(file.readEntry("X-KSIM-LIBRARY").local8Bit());
  if (pluginName.isEmpty())
    return EmptyLibName;

  TQCString libName(Private::ksimString + pluginName);
  KLibrary *library = KLibLoader::self()->library(libName);
  if (!library)
    return LibNotFound;

  TQCString symbol("init_plugin");
  if (Private::PluginPtr *create = (Private::PluginPtr *)(library->symbol(symbol))) {
    d->pluginList.append(KSim::Plugin(create(pluginName), file));
    d->lib = TQString();
    d->lastLoaded = true;
  }
  else {
    d->error = KLibLoader::self()->lastErrorMessage().isEmpty() ?
       i18n("Unable to get last error message") :
       KLibLoader::self()->lastErrorMessage();

    KLibLoader::self()->unloadLibrary(libName);
    d->lib = pluginName;
    d->lastLoaded = false;
    return UnSymbols;
  }

  emit pluginLoaded(d->pluginList.last());
  return LibLoaded;
}