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authortoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
committertoma <toma@283d02a7-25f6-0310-bc7c-ecb5cbfe19da>2009-11-25 17:56:58 +0000
commit460c52653ab0dcca6f19a4f492ed2c5e4e963ab0 (patch)
tree67208f7c145782a7e90b123b982ca78d88cc2c87 /libkdepim/pluginloader.h
downloadtdepim-460c52653ab0dcca6f19a4f492ed2c5e4e963ab0.tar.gz
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Copy the KDE 3.5 branch to branches/trinity for new KDE 3.5 features.
BUG:215923 git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdepim@1054174 283d02a7-25f6-0310-bc7c-ecb5cbfe19da
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+/* -*- c++ -*-
+ This file is part of libkdepim.
+
+ Copyright (c) 2002,2004 Marc Mutz <mutz@kde.org>
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License as published by the Free Software Foundation; either
+ version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with this library; see the file COPYING.LIB. If not, write to
+ the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+#ifndef __KPIM_SHARED_PLUGINLOADER_H__
+#define __KPIM_SHARED_PLUGINLOADER_H__
+
+#include <pluginloaderbase.h>
+
+namespace KPIM {
+
+ /**
+ * @short A generic plugin loader for when KPart::Plugin is overkill
+ * @author Marc Mutz <mutz@kde.org> based on KABC's FormatFactory
+ *
+ * This is a generic plugin loader / factory for small plugins that
+ * don't want to be QObjects.
+ *
+ * @section Usage
+ *
+ * A PluginLoader takes two template arguments, <code>T</code> and
+ * <code>T_config</code>:
+ *
+ * <dl>
+ * <dt>T</dt><dd>The type of object to return</dd>
+ * <dt>T_config::mainfunc</dt><dd>The suffix of the factory function to call
+ * in the library to obtain a new object of type <code>T</code>.
+ * The string passed to <code>KLibrary::symbol()</code> is
+ * <code>libName_mainfunc</code>.</dd>
+ * <dt>T_config::path</dt><dd>The search pattern for <tt>.desktop</tt> files
+ * containing the plugin descriptions. This is the string passed as
+ * the @p filter argument to
+ * <code>KStandardDirs::findAllResources</code>.</dd>
+ * </dl>
+ *
+ * The last two parameters being strings, they are passed via an
+ * encapsulating class, of which <code>mainfunc</code> and
+ * <code>path</code> are public static members:
+ *
+ * <pre>
+ * struct MyObjectPluginLoaderConfig {
+ * static const char * const mainfunc;
+ * static const char * const path;
+ * };
+ * const char * const MyObjectPluginLoaderConfig::mainfunc = "myapp_create_myobject";
+ * const char * const MyObjectPluginLoaderConfig::path = "myapp/plugins/ *.desktop";
+ * </pre>
+ *
+ * You would then use a <tt>typedef</tt> to create a less unwieldy
+ * name for your plugin loader:
+ *
+ * <pre>
+ * typedef KPIM::PluginLoader< MyObject, MyObjectPluginLoaderConfig > MyObjectPluginLoader;
+ * </pre>
+ *
+ * All of this is what the
+ * <code>KPIM_DEFINE_PLUGIN_LOADER(pluginloadername,type,mainfunc,path)</code> macro
+ * achieves.
+ *
+ **/
+ template< typename T, typename T_config >
+ class KDE_EXPORT PluginLoader : public PluginLoaderBase {
+ protected:
+ PluginLoader() : PluginLoaderBase() {}
+
+ private:
+ static PluginLoader<T,T_config> * mSelf;
+
+ public:
+ virtual ~PluginLoader() { mSelf = 0; }
+
+ /** Returns the single instance of this loader. */
+ static PluginLoader<T,T_config> * instance() {
+ if ( !mSelf ) {
+ mSelf = new PluginLoader<T,T_config>();
+ mSelf->scan();
+ }
+ return mSelf;
+ }
+
+ /** Rescans the plugin directory to find any newly installed
+ plugins.
+ **/
+ virtual void scan() {
+ doScan( T_config::path );
+ }
+
+ /** Returns a pointer to a plugin object (of type @p T) or a null
+ pointer if the type wasn't found. You can extend this method
+ for when you want to handle builtin types */
+ virtual T * createForName( const QString & type ) const {
+ void * main_func = mainFunc( type, T_config::mainfunc );
+ if ( !main_func ) return 0;
+
+ // cast to a pointer to a function returning T*, call it and
+ // return the result; don't you love C? ;-)
+ return ((T* (*)())( main_func ))();
+ }
+ };
+
+ template< typename T, typename T_config >
+ PluginLoader<T,T_config> * PluginLoader<T,T_config>::mSelf = 0;
+
+}
+
+#define KPIM_DEFINE_PLUGIN_LOADER( pl, t, mf, p ) \
+ namespace { /* don't pollute namespaces */ \
+ struct KDE_EXPORT pl##Config { \
+ static const char * const mainfunc; \
+ static const char * const path; \
+ }; \
+ const char * const pl##Config::mainfunc = mf; \
+ const char * const pl##Config::path = p; \
+ } \
+ typedef KPIM::PluginLoader< t, pl##Config > pl; \
+
+
+#endif // __KPIM_SHARED_PLUGINLOADER_H__