gio/giomodule.h

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  *
  18  * Author: Alexander Larsson <alexl@redhat.com>
  19  */
  20
  21 #ifndef __G_IO_MODULE_H__
  22 #define __G_IO_MODULE_H__
  23
  24 #if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
  25 #error "Only <gio/gio.h> can be included directly."
  26 #endif
  27
  28 #include <gio/giotypes.h>
  29 #include <gmodule.h>
  30
  31 G_BEGIN_DECLS
  32
  33 typedef struct _GIOModuleScope GIOModuleScope;
  34
  35 GLIB_AVAILABLE_IN_2_30
  36 GIOModuleScope *   g_io_module_scope_new     (GIOModuleScopeFlags  flags);
  37 GLIB_AVAILABLE_IN_2_30
  38 void               g_io_module_scope_free    (GIOModuleScope      *scope);
  39 GLIB_AVAILABLE_IN_2_30
  40 void               g_io_module_scope_block   (GIOModuleScope      *scope,
  41                                               const gchar         *basename);
  42
  43 #define G_IO_TYPE_MODULE         (g_io_module_get_type ())
  44 #define G_IO_MODULE(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), G_IO_TYPE_MODULE, GIOModule))
  45 #define G_IO_MODULE_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST((k), G_IO_TYPE_MODULE, GIOModuleClass))
  46 #define G_IO_IS_MODULE(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_IO_TYPE_MODULE))
  47 #define G_IO_IS_MODULE_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), G_IO_TYPE_MODULE))
  48 #define G_IO_MODULE_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_IO_TYPE_MODULE, GIOModuleClass))
  49
  50 /**
  51  * GIOModule:
  52  *
  53  * Opaque module base class for extending GIO.
  54  **/
  55 typedef struct _GIOModuleClass GIOModuleClass;
  56
  57 GLIB_AVAILABLE_IN_ALL
  58 GType              g_io_module_get_type                       (void) G_GNUC_CONST;
  59 GLIB_AVAILABLE_IN_ALL
  60 GIOModule         *g_io_module_new                            (const gchar       *filename);
  61
  62 GLIB_AVAILABLE_IN_ALL
  63 void               g_io_modules_scan_all_in_directory         (const char        *dirname);
  64 GLIB_AVAILABLE_IN_ALL
  65 GList             *g_io_modules_load_all_in_directory         (const gchar       *dirname);
  66
  67 GLIB_AVAILABLE_IN_2_30
  68 void               g_io_modules_scan_all_in_directory_with_scope   (const gchar       *dirname,
  69                                                                     GIOModuleScope    *scope);
  70 GLIB_AVAILABLE_IN_2_30
  71 GList             *g_io_modules_load_all_in_directory_with_scope   (const gchar       *dirname,
  72                                                                     GIOModuleScope    *scope);
  73
  74 GLIB_AVAILABLE_IN_ALL
  75 GIOExtensionPoint *g_io_extension_point_register              (const char        *name);
  76 GLIB_AVAILABLE_IN_ALL
  77 GIOExtensionPoint *g_io_extension_point_lookup                (const char        *name);
  78 GLIB_AVAILABLE_IN_ALL
  79 void               g_io_extension_point_set_required_type     (GIOExtensionPoint *extension_point,
  80                                                                GType              type);
  81 GLIB_AVAILABLE_IN_ALL
  82 GType              g_io_extension_point_get_required_type     (GIOExtensionPoint *extension_point);
  83 GLIB_AVAILABLE_IN_ALL
  84 GList             *g_io_extension_point_get_extensions        (GIOExtensionPoint *extension_point);
  85 GLIB_AVAILABLE_IN_ALL
  86 GIOExtension *     g_io_extension_point_get_extension_by_name (GIOExtensionPoint *extension_point,
  87                                                                const char        *name);
  88 GLIB_AVAILABLE_IN_ALL
  89 GIOExtension *     g_io_extension_point_implement             (const char        *extension_point_name,
  90                                                                GType              type,
  91                                                                const char        *extension_name,
  92                                                                gint               priority);
  93
  94 GLIB_AVAILABLE_IN_ALL
  95 GType              g_io_extension_get_type                    (GIOExtension      *extension);
  96 GLIB_AVAILABLE_IN_ALL
  97 const char *       g_io_extension_get_name                    (GIOExtension      *extension);
  98 GLIB_AVAILABLE_IN_ALL
  99 gint               g_io_extension_get_priority                (GIOExtension      *extension);
 100 GLIB_AVAILABLE_IN_ALL
 101 GTypeClass*        g_io_extension_ref_class                   (GIOExtension      *extension);
 102
 103
 104 /* API for the modules to implement */
 105
 106 /**
 107  * g_io_module_load:
 108  * @module: a #GIOModule.
 109  *
 110  * Required API for GIO modules to implement.
 111  *
 112  * This function is run after the module has been loaded into GIO,
 113  * to initialize the module. Typically, this function will call
 114  * g_io_extension_point_implement().
 115  **/
 116 GLIB_AVAILABLE_IN_ALL
 117 void   g_io_module_load   (GIOModule *module);
 118
 119 /**
 120  * g_io_module_unload:
 121  * @module: a #GIOModule.
 122  *
 123  * Required API for GIO modules to implement.
 124  *
 125  * This function is run when the module is being unloaded from GIO,
 126  * to finalize the module.
 127  **/
 128 GLIB_AVAILABLE_IN_ALL
 129 void   g_io_module_unload (GIOModule *module);
 130
 131 /**
 132  * g_io_module_query:
 133  *
 134  * Optional API for GIO modules to implement.
 135  *
 136  * Should return a list of all the extension points that may be
 137  * implemented in this module.
 138  *
 139  * This method will not be called in normal use, however it may be
 140  * called when probing existing modules and recording which extension
 141  * points that this model is used for. This means we won't have to
 142  * load and initialize this module unless its needed.
 143  *
 144  * If this function is not implemented by the module the module will
 145  * always be loaded, initialized and then unloaded on application
 146  * startup so that it can register its extension points during init.
 147  *
 148  * Note that a module need not actually implement all the extension
 149  * points that g_io_module_query() returns, since the exact list of
 150  * extension may depend on runtime issues. However all extension
 151  * points actually implemented must be returned by g_io_module_query()
 152  * (if defined).
 153  *
 154  * When installing a module that implements g_io_module_query() you must
 155  * run gio-querymodules in order to build the cache files required for
 156  * lazy loading.
 157  *
 158  * Returns: (transfer full): A %NULL-terminated array of strings,
 159  *     listing the supported extension points of the module. The array
 160  *     must be suitable for freeing with g_strfreev().
 161  *
 162  * Since: 2.24
 163  **/
 164 GLIB_AVAILABLE_IN_ALL
 165 char **g_io_module_query (void);
 166
 167 G_END_DECLS
 168
 169 #endif /* __G_IO_MODULE_H__ */