1 files changed, 489 insertions, 0 deletions
diff --git a/libkdepim/komposer/core/pluginmanager.cpp b/libkdepim/komposer/core/pluginmanager.cpp
new file mode 100644
index 000000000..82e7f0e9b
--- /dev/null
+++ b/libkdepim/komposer/core/pluginmanager.cpp
@@ -0,0 +1,489 @@
+// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 2; -*-
+/**
+ * pluginmanager.cpp
+ * Most of this code has been lifted from Martijn's KopetePluginManager class
+ *
+ * Copyright (C)  2004  Zack Rusin <zack@kde.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301  USA
+ */
+#include "pluginmanager.h"
+
+#include "plugin.h"
+
+#include <qapplication.h>
+#include <qfile.h>
+#include <qregexp.h>
+#include <qtimer.h>
+#include <qvaluestack.h>
+
+#include <kapplication.h>
+#include <kdebug.h>
+#include <kparts/componentfactory.h>
+#include <kplugininfo.h>
+#include <ksettings/dispatcher.h>
+#include <ksimpleconfig.h>
+#include <kstandarddirs.h>
+#include <kstaticdeleter.h>
+#include <kurl.h>
+
+
+namespace Komposer
+{
+
+class PluginManager::Private
+{
+public:
+  // All available plugins, regardless of category, and loaded or not
+  QValueList<KPluginInfo*> plugins;
+
+  // Dict of all currently loaded plugins, mapping the KPluginInfo to
+  // a plugin
+  QMap<KPluginInfo*, Plugin*> loadedPlugins;
+
+  // The plugin manager's mode. The mode is StartingUp until loadAllPlugins()
+  // has finished loading the plugins, after which it is set to Running.
+  // ShuttingDown and DoneShutdown are used during Komposer shutdown by the
+  // async unloading of plugins.
+  enum ShutdownMode { StartingUp, Running, ShuttingDown, DoneShutdown };
+  ShutdownMode shutdownMode;
+
+  KSharedConfig::Ptr config;
+  // Plugins pending for loading
+  QValueStack<QString> pluginsToLoad;
+};
+
+PluginManager::PluginManager( QObject *parent )
+  : QObject( parent )
+{
+  d = new Private;
+
+  // We want to add a reference to the application's event loop so we
+  // can remain in control when all windows are removed.
+  // This way we can unload plugins asynchronously, which is more
+  // robust if they are still doing processing.
+  kapp->ref();
+  d->shutdownMode = Private::StartingUp;
+
+  KSettings::Dispatcher::self()->registerInstance( KGlobal::instance(),
+                                                   this, SLOT( loadAllPlugins() ) );
+
+  d->plugins = KPluginInfo::fromServices(
+    KTrader::self()->query( QString::fromLatin1( "Komposer/Plugin" ),
+                            QString::fromLatin1( "[X-Komposer-Version] == 1" ) ) );
+}
+
+PluginManager::~PluginManager()
+{
+  if ( d->shutdownMode != Private::DoneShutdown ) {
+    slotShutdownTimeout();
+#if 0
+    kdWarning() << k_funcinfo
+                << "Destructing plugin manager without going through "
+                << "the shutdown process!"
+                << endl
+                << kdBacktrace(10) << endl;
+#endif
+  }
+
+  // Quick cleanup of the remaining plugins, hope it helps
+  QMap<KPluginInfo*, Plugin*>::ConstIterator it;
+  for ( it = d->loadedPlugins.begin(); it != d->loadedPlugins.end(); /* EMPTY */ )
+  {
+    // Remove causes the iterator to become invalid, so pre-increment first
+    QMap<KPluginInfo*, Plugin*>::ConstIterator nextIt( it );
+    ++nextIt;
+    kdWarning() << k_funcinfo << "Deleting stale plugin '"
+                       << it.data()->name() << "'" << endl;
+    delete it.data();
+    it = nextIt;
+  }
+
+  delete d;
+}
+
+QValueList<KPluginInfo*>
+PluginManager::availablePlugins( const QString &category ) const
+{
+  if ( category.isEmpty() )
+    return d->plugins;
+
+  QValueList<KPluginInfo*> result;
+  QValueList<KPluginInfo*>::ConstIterator it;
+  for ( it = d->plugins.begin(); it != d->plugins.end(); ++it )
+  {
+    if ( ( *it )->category() == category )
+      result.append( *it );
+  }
+
+  return result;
+}
+
+QMap<KPluginInfo*, Plugin*>
+PluginManager::loadedPlugins( const QString &category ) const
+{
+  QMap<KPluginInfo*, Plugin*> result;
+  QMap<KPluginInfo*, Plugin*>::ConstIterator it;
+  for ( it = d->loadedPlugins.begin(); it != d->loadedPlugins.end(); ++it )
+  {
+    if ( category.isEmpty() || it.key()->category() == category )
+      result.insert( it.key(), it.data() );
+  }
+
+  return result;
+}
+
+void
+PluginManager::shutdown()
+{
+  d->shutdownMode = Private::ShuttingDown;
+
+  // Remove any pending plugins to load, we're shutting down now :)
+  d->pluginsToLoad.clear();
+
+  // Ask all plugins to unload
+  if ( d->loadedPlugins.empty() ) {
+    d->shutdownMode = Private::DoneShutdown;
+  } else {
+    QMap<KPluginInfo*, Plugin*>::ConstIterator it;
+    for ( it = d->loadedPlugins.begin(); it != d->loadedPlugins.end(); /* EMPTY */ )
+    {
+      // Remove causes the iterator to become invalid, so pre-increment first
+      QMap<KPluginInfo*, Plugin*>::ConstIterator nextIt( it );
+      ++nextIt;
+      it.data()->aboutToUnload();
+      it = nextIt;
+    }
+  }
+
+  QTimer::singleShot( 3000, this, SLOT(slotShutdownTimeout()) );
+}
+
+void
+PluginManager::slotPluginReadyForUnload()
+{
+  // Using QObject::sender() is on purpose here, because otherwise all
+  // plugins would have to pass 'this' as parameter, which makes the API
+  // less clean for plugin authors
+  Plugin* plugin = dynamic_cast<Plugin*>( const_cast<QObject*>( sender() ) );
+  if ( !plugin )
+  {
+    kdWarning() << k_funcinfo << "Calling object is not a plugin!" << endl;
+    return;
+
+  }
+  kdDebug()<<"manager unloading"<<endl;
+  plugin->deleteLater();
+}
+
+void
+PluginManager::slotShutdownTimeout()
+{
+  // When we were already done the timer might still fire.
+  // Do nothing in that case.
+  if ( d->shutdownMode == Private::DoneShutdown )
+    return;
+
+#ifndef NDEBUG
+  QStringList remaining;
+  for ( QMap<KPluginInfo*, Plugin*>::ConstIterator it = d->loadedPlugins.begin();
+        it != d->loadedPlugins.end(); ++it )
+    remaining.append( it.key()->pluginName() );
+
+  kdWarning() << k_funcinfo << "Some plugins didn't shutdown in time!" << endl
+              << "Remaining plugins: "
+              << remaining.join( QString::fromLatin1( ", " ) ) << endl
+              << "Forcing Komposer shutdown now." << endl;
+#endif
+
+  slotShutdownDone();
+}
+
+void
+PluginManager::slotShutdownDone()
+{
+  d->shutdownMode = Private::DoneShutdown;
+
+  kapp->deref();
+}
+
+void
+PluginManager::loadAllPlugins()
+{
+  // FIXME: We need session management here - Martijn
+
+  if ( !d->config )
+    d->config = KSharedConfig::openConfig( "komposerrc" );
+
+  QMap<QString, QString> entries = d->config->entryMap(
+    QString::fromLatin1( "Plugins" ) );
+
+  QMap<QString, QString>::Iterator it;
+  for ( it = entries.begin(); it != entries.end(); ++it )
+  {
+    QString key = it.key();
+    if ( key.endsWith( QString::fromLatin1( "Enabled" ) ) )
+    {
+      key.setLength( key.length() - 7 );
+      //kdDebug() << k_funcinfo << "Set " << key << " to " << it.data() << endl;
+
+      if ( it.data() == QString::fromLatin1( "true" ) )
+      {
+        if ( !plugin( key ) )
+          d->pluginsToLoad.push( key );
+      }
+      else
+      {
+        // FIXME: Does this ever happen? As loadAllPlugins is only called on startup
+        //        I'd say 'no'. If it does, it should be made async
+        //        though. - Martijn
+        if ( plugin( key ) )
+          unloadPlugin( key );
+      }
+    }
+  }
+
+  // Schedule the plugins to load
+  QTimer::singleShot( 0, this, SLOT( slotLoadNextPlugin() ) );
+}
+
+void PluginManager::slotLoadNextPlugin()
+{
+  if ( d->pluginsToLoad.isEmpty() )
+  {
+    if ( d->shutdownMode == Private::StartingUp )
+    {
+      d->shutdownMode = Private::Running;
+      emit allPluginsLoaded();
+    }
+    return;
+  }
+
+  QString key = d->pluginsToLoad.pop();
+  loadPluginInternal( key );
+
+  // Schedule the next run unconditionally to avoid code duplication on the
+  // allPluginsLoaded() signal's handling. This has the added benefit that
+  // the signal is delayed one event loop, so the accounts are more likely
+  // to be instantiated.
+  QTimer::singleShot( 0, this, SLOT( slotLoadNextPlugin() ) );
+}
+
+Plugin*
+PluginManager::loadPlugin( const QString &pluginId,
+                           PluginLoadMode mode /* = LoadSync */ )
+{
+  if ( mode == LoadSync ) {
+    return loadPluginInternal( pluginId );
+  } else {
+    d->pluginsToLoad.push( pluginId );
+    QTimer::singleShot( 0, this, SLOT( slotLoadNextPlugin() ) );
+    return 0;
+  }
+}
+
+Plugin*
+PluginManager::loadPluginInternal( const QString &pluginId )
+{
+  KPluginInfo* info = infoForPluginId( pluginId );
+  if ( !info ) {
+    kdWarning() << k_funcinfo << "Unable to find a plugin named '"
+                << pluginId << "'!" << endl;
+    return 0;
+  }
+
+  if ( d->loadedPlugins.contains( info ) )
+    return d->loadedPlugins[ info ];
+
+  int error = 0;
+  Plugin *plugin = KParts::ComponentFactory::createInstanceFromQuery<Komposer::Plugin>(
+    QString::fromLatin1( "Komposer/Plugin" ),
+    QString::fromLatin1( "[X-KDE-PluginInfo-Name]=='%1'" ).arg( pluginId ),
+    this, 0, QStringList(), &error );
+
+  if ( plugin ) {
+    d->loadedPlugins.insert( info, plugin );
+    info->setPluginEnabled( true );
+
+    connect( plugin, SIGNAL(destroyed(QObject*)),
+             this, SLOT(slotPluginDestroyed(QObject*)) );
+    connect( plugin, SIGNAL(readyForUnload()),
+             this, SLOT(slotPluginReadyForUnload()) );
+
+    kdDebug() << k_funcinfo << "Successfully loaded plugin '"
+              << pluginId << "'" << endl;
+
+    emit pluginLoaded( plugin );
+  } else {
+    switch ( error ) {
+    case KParts::ComponentFactory::ErrNoServiceFound:
+      kdDebug() << k_funcinfo << "No service implementing the given mimetype "
+                << "and fullfilling the given constraint expression can be found."
+                << endl;
+      break;
+
+    case KParts::ComponentFactory::ErrServiceProvidesNoLibrary:
+      kdDebug() << "the specified service provides no shared library." << endl;
+      break;
+
+    case KParts::ComponentFactory::ErrNoLibrary:
+      kdDebug() << "the specified library could not be loaded." << endl;
+      break;
+
+    case KParts::ComponentFactory::ErrNoFactory:
+      kdDebug() << "the library does not export a factory for creating components."
+                << endl;
+      break;
+
+    case KParts::ComponentFactory::ErrNoComponent:
+      kdDebug() << "the factory does not support creating components "
+                << "of the specified type."
+                << endl;
+      break;
+    }
+
+    kdDebug() << k_funcinfo << "Loading plugin '" << pluginId
+              << "' failed, KLibLoader reported error: '"
+              << KLibLoader::self()->lastErrorMessage()
+              << "'" << endl;
+  }
+
+  return plugin;
+}
+
+bool
+PluginManager::unloadPlugin( const QString &spec )
+{
+  QMap<KPluginInfo*, Plugin*>::ConstIterator it;
+  for ( it = d->loadedPlugins.begin(); it != d->loadedPlugins.end(); ++it )
+  {
+    if ( it.key()->pluginName() == spec )
+    {
+      it.data()->aboutToUnload();
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void
+PluginManager::slotPluginDestroyed( QObject *plugin )
+{
+  QMap<KPluginInfo*, Plugin*>::Iterator it;
+  for ( it = d->loadedPlugins.begin(); it != d->loadedPlugins.end(); ++it )
+  {
+    if ( it.data() == plugin )
+    {
+      d->loadedPlugins.erase( it );
+      break;
+    }
+  }
+
+  if ( d->shutdownMode == Private::ShuttingDown && d->loadedPlugins.isEmpty() )
+  {
+    // Use a timer to make sure any pending deleteLater() calls have
+    // been handled first
+    QTimer::singleShot( 0, this, SLOT(slotShutdownDone()) );
+  }
+}
+
+Plugin*
+PluginManager::plugin( const QString &pluginId ) const
+{
+  KPluginInfo *info = infoForPluginId( pluginId );
+  if ( !info )
+    return 0;
+
+  if ( d->loadedPlugins.contains( info ) )
+    return d->loadedPlugins[ info ];
+  else
+    return 0;
+}
+
+QString
+PluginManager::pluginName( const Plugin *plugin ) const
+{
+  QMap<KPluginInfo*, Plugin*>::ConstIterator it;
+  for ( it = d->loadedPlugins.begin(); it != d->loadedPlugins.end(); ++it )
+  {
+    if ( it.data() == plugin )
+      return it.key()->name();
+  }
+
+  return QString::fromLatin1( "Unknown" );
+}
+
+QString
+PluginManager::pluginId( const Plugin *plugin ) const
+{
+  QMap<KPluginInfo*, Plugin*>::ConstIterator it;
+  for ( it = d->loadedPlugins.begin(); it != d->loadedPlugins.end(); ++it )
+  {
+    if ( it.data() == plugin )
+      return it.key()->pluginName();
+  }
+
+  return QString::fromLatin1( "unknown" );
+}
+
+QString
+PluginManager::pluginIcon( const Plugin *plugin ) const
+{
+  QMap<KPluginInfo*, Plugin*>::ConstIterator it;
+  for ( it = d->loadedPlugins.begin(); it != d->loadedPlugins.end(); ++it )
+  {
+    if ( it.data() == plugin )
+      return it.key()->icon();
+  }
+
+  return QString::fromLatin1( "Unknown" );
+}
+
+KPluginInfo*
+PluginManager::infoForPluginId( const QString &pluginId ) const
+{
+  QValueList<KPluginInfo*>::ConstIterator it;
+  for ( it = d->plugins.begin(); it != d->plugins.end(); ++it )
+  {
+    if ( ( *it )->pluginName() == pluginId )
+      return *it;
+  }
+
+  return 0;
+}
+
+bool
+PluginManager::setPluginEnabled( const QString &pluginId, bool enabled /* = true */ )
+{
+  if ( !d->config )
+    d->config = KSharedConfig::openConfig( "komposerrc" );
+
+  d->config->setGroup( "Plugins" );
+
+
+  if ( !infoForPluginId( pluginId ) )
+    return false;
+
+  d->config->writeEntry( pluginId + QString::fromLatin1( "Enabled" ), enabled );
+  d->config->sync();
+
+  return true;
+}
+
+}
+
+#include "pluginmanager.moc"