/* GIO - GLib Input, Output and Streaming Library

 *

 * Copyright (C) 2006-2007 Red Hat, Inc.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 *

 * Author: Alexander Larsson <alexl@redhat.com>

 */

#ifndef __G_IO_MODULE_H__

#define __G_IO_MODULE_H__

#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)

#error "Only <gio/gio.h> can be included directly."

#endif

#include <gio/giotypes.h>

#include <gmodule.h>

G_BEGIN_DECLS

typedef struct _GIOModuleScope GIOModuleScope;

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GIOModuleScope *   g_io_module_scope_new     (GIOModuleScopeFlags  flags);

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void               g_io_module_scope_free    (GIOModuleScope      *scope);

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void               g_io_module_scope_block   (GIOModuleScope      *scope,

                                              const gchar         *basename);

#define G_IO_TYPE_MODULE         (g_io_module_get_type ())

#define G_IO_MODULE(o)           (G_TYPE_CHECK_INSTANCE_CAST ((o), G_IO_TYPE_MODULE, GIOModule))

#define G_IO_MODULE_CLASS(k)     (G_TYPE_CHECK_CLASS_CAST((k), G_IO_TYPE_MODULE, GIOModuleClass))

#define G_IO_IS_MODULE(o)        (G_TYPE_CHECK_INSTANCE_TYPE ((o), G_IO_TYPE_MODULE))

#define G_IO_IS_MODULE_CLASS(k)  (G_TYPE_CHECK_CLASS_TYPE ((k), G_IO_TYPE_MODULE))

#define G_IO_MODULE_GET_CLASS(o) (G_TYPE_INSTANCE_GET_CLASS ((o), G_IO_TYPE_MODULE, GIOModuleClass))

/**

 * GIOModule:

 *

 * Opaque module base class for extending GIO.

 **/

typedef struct _GIOModuleClass GIOModuleClass;

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GType              g_io_module_get_type                       (void) G_GNUC_CONST;

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GIOModule         *g_io_module_new                            (const gchar       *filename);

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void               g_io_modules_scan_all_in_directory         (const char        *dirname);

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GList             *g_io_modules_load_all_in_directory         (const gchar       *dirname);

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void               g_io_modules_scan_all_in_directory_with_scope   (const gchar       *dirname,

                                                                    GIOModuleScope    *scope);

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GList             *g_io_modules_load_all_in_directory_with_scope   (const gchar       *dirname,

                                                                    GIOModuleScope    *scope);

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GIOExtensionPoint *g_io_extension_point_register              (const char        *name);

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GIOExtensionPoint *g_io_extension_point_lookup                (const char        *name);

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void               g_io_extension_point_set_required_type     (GIOExtensionPoint *extension_point,

							       GType              type);

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GType              g_io_extension_point_get_required_type     (GIOExtensionPoint *extension_point);

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GList             *g_io_extension_point_get_extensions        (GIOExtensionPoint *extension_point);

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GIOExtension *     g_io_extension_point_get_extension_by_name (GIOExtensionPoint *extension_point,

							       const char        *name);

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GIOExtension *     g_io_extension_point_implement             (const char        *extension_point_name,

							       GType              type,

							       const char        *extension_name,

							       gint               priority);

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GType              g_io_extension_get_type                    (GIOExtension      *extension);

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const char *       g_io_extension_get_name                    (GIOExtension      *extension);

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gint               g_io_extension_get_priority                (GIOExtension      *extension);

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GTypeClass*        g_io_extension_ref_class                   (GIOExtension      *extension);

/* API for the modules to implement */

/**

 * g_io_module_load:

 * @module: a #GIOModule.

 *

 * Required API for GIO modules to implement.

 *

 * This function is run after the module has been loaded into GIO,

 * to initialize the module. Typically, this function will call

 * g_io_extension_point_implement().

 *

 * Since 2.56, this function should be named `g_io_<modulename>_load`, where

 * `modulename` is the plugin’s filename with the `lib` or `libgio` prefix and

 * everything after the first dot removed, and with `-` replaced with `_`

 * throughout. For example, `libgiognutls-helper.so` becomes `gnutls_helper`.

 * Using the new symbol names avoids name clashes when building modules

 * statically. The old symbol names continue to be supported, but cannot be used

 * for static builds.

 **/

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void   g_io_module_load   (GIOModule *module);

/**

 * g_io_module_unload:

 * @module: a #GIOModule.

 *

 * Required API for GIO modules to implement.

 *

 * This function is run when the module is being unloaded from GIO,

 * to finalize the module.

 *

 * Since 2.56, this function should be named `g_io_<modulename>_unload`, where

 * `modulename` is the plugin’s filename with the `lib` or `libgio` prefix and

 * everything after the first dot removed, and with `-` replaced with `_`

 * throughout. For example, `libgiognutls-helper.so` becomes `gnutls_helper`.

 * Using the new symbol names avoids name clashes when building modules

 * statically. The old symbol names continue to be supported, but cannot be used

 * for static builds.

 **/

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void   g_io_module_unload (GIOModule *module);

/**

 * g_io_module_query:

 *

 * Optional API for GIO modules to implement.

 *

 * Should return a list of all the extension points that may be

 * implemented in this module.

 *

 * This method will not be called in normal use, however it may be

 * called when probing existing modules and recording which extension

 * points that this model is used for. This means we won't have to

 * load and initialize this module unless its needed.

 *

 * If this function is not implemented by the module the module will

 * always be loaded, initialized and then unloaded on application

 * startup so that it can register its extension points during init.

 *

 * Note that a module need not actually implement all the extension

 * points that g_io_module_query() returns, since the exact list of

 * extension may depend on runtime issues. However all extension

 * points actually implemented must be returned by g_io_module_query()

 * (if defined).

 *

 * When installing a module that implements g_io_module_query() you must

 * run gio-querymodules in order to build the cache files required for

 * lazy loading.

 *

 * Since 2.56, this function should be named `g_io_<modulename>_query`, where

 * `modulename` is the plugin’s filename with the `lib` or `libgio` prefix and

 * everything after the first dot removed, and with `-` replaced with `_`

 * throughout. For example, `libgiognutls-helper.so` becomes `gnutls_helper`.

 * Using the new symbol names avoids name clashes when building modules

 * statically. The old symbol names continue to be supported, but cannot be used

 * for static builds.

 *

 * Returns: (transfer full): A %NULL-terminated array of strings,

 *     listing the supported extension points of the module. The array

 *     must be suitable for freeing with g_strfreev().

 *

 * Since: 2.24

 **/

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char **g_io_module_query (void);

G_END_DECLS

#endif /* __G_IO_MODULE_H__ */