diff options
Diffstat (limited to 'src/uca-plugin-manager.c')
| -rw-r--r-- | src/uca-plugin-manager.c | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/src/uca-plugin-manager.c b/src/uca-plugin-manager.c new file mode 100644 index 0000000..7788678 --- /dev/null +++ b/src/uca-plugin-manager.c @@ -0,0 +1,260 @@ +/** + * SECTION:uca-plugin-manager + * @Short_description: Load an #UcaFilter from a shared object + * @Title: UcaPluginManager + * + * The plugin manager opens shared object modules searched for in locations + * specified with uca_plugin_manager_add_paths(). An #UcaFilter can be + * instantiated with uca_plugin_manager_get_filter() with a one-to-one mapping + * between filter name xyz and module name libfilterxyz.so. Any errors are + * reported as one of #UcaPluginManagerError codes. + */ +#include <gmodule.h> +#include "uca-plugin-manager.h" + +G_DEFINE_TYPE (UcaPluginManager, uca_plugin_manager, G_TYPE_OBJECT) + +#define UCA_PLUGIN_MANAGER_GET_PRIVATE(obj) (G_TYPE_INSTANCE_GET_PRIVATE((obj), UCA_TYPE_PLUGIN_MANAGER, UcaPluginManagerPrivate)) + +struct _UcaPluginManagerPrivate { + GList *search_paths; +}; + +/** + * UcaPluginManagerError: + * @UCA_PLUGIN_MANAGER_ERROR_MODULE_NOT_FOUND: The module could not be found + * @UCA_PLUGIN_MANAGER_ERROR_MODULE_OPEN: Module could not be opened + * @UCA_PLUGIN_MANAGER_ERROR_SYMBOL_NOT_FOUND: Necessary entry symbol was not + * found + * + * Possible errors that uca_plugin_manager_get_filter() can return. + */ +GQuark +uca_plugin_manager_error_quark (void) +{ + return g_quark_from_static_string ("uca-plugin-manager-error-quark"); +} + +/** + * uca_plugin_manager_new: + * @config: (allow-none): A #UcaConfiguration object or %NULL. + * + * Create a plugin manager object to instantiate filter objects. When a config + * object is passed to the constructor, its search-path property is added to the + * internal search paths. + * + * Return value: A new plugin manager object. + */ +UcaPluginManager * +uca_plugin_manager_new () +{ + return UCA_PLUGIN_MANAGER (g_object_new (UCA_TYPE_PLUGIN_MANAGER, NULL)); +} + +void +uca_plugin_manager_add_path (UcaPluginManager *manager, + const gchar *path) +{ + g_return_if_fail (UCA_IS_PLUGIN_MANAGER (manager)); + + if (g_file_test (path, G_FILE_TEST_EXISTS | G_FILE_TEST_IS_DIR)) { + UcaPluginManagerPrivate *priv; + + priv = manager->priv; + priv->search_paths = g_list_append (priv->search_paths, + g_strdup (path)); + } +} + +static GList * +get_camera_names_from_directory (const gchar *path) +{ + static const gchar *pattern_string = "libuca([A-Za-z]+)"; + GRegex *pattern; + GDir *dir; + GList *result = NULL; + + pattern = g_regex_new (pattern_string, 0, 0, NULL); + dir = g_dir_open (path, 0, NULL); + + if (dir != NULL) { + GMatchInfo *match_info = NULL; + const gchar *name = g_dir_read_name (dir); + + while (name != NULL) { + g_regex_match (pattern, name, 0, &match_info); + + if (g_match_info_matches (match_info)) { + gchar *word = g_match_info_fetch (match_info, 1); + result = g_list_append (result, word); + } + + name = g_dir_read_name (dir); + } + } + + return result; +} + +GList * +uca_plugin_manager_get_available_cameras (UcaPluginManager *manager) +{ + UcaPluginManagerPrivate *priv; + GList *camera_names; + + g_return_val_if_fail (UCA_IS_PLUGIN_MANAGER (manager), NULL); + + priv = manager->priv; + + for (GList *it = g_list_first (priv->search_paths); it != NULL; it = g_list_next (it)) { + camera_names = g_list_concat (camera_names, + get_camera_names_from_directory ((const gchar*) it->data)); + } + + return camera_names; +} + +UcaCamera * +uca_plugin_manager_new_camera (UcaPluginManager *manager, + const gchar *name, + GError **error) +{ + return NULL; +} + +/** + * uca_plugin_manager_get_filter: + * @manager: A #UcaPluginManager + * @name: Name of the plugin. + * @error: return location for a GError or %NULL + * + * Load a #UcaFilter module and return an instance. The shared object name must + * be * constructed as "libfilter@name.so". + * + * Returns: (transfer none) (allow-none): #UcaFilter or %NULL if module cannot be found + * + * Since: 0.2, the error parameter is available + */ +/* UcaFilter * */ +/* uca_plugin_manager_get_filter (UcaPluginManager *manager, const gchar *name, GError **error) */ +/* { */ +/* g_return_val_if_fail (UCA_IS_PLUGIN_MANAGER (manager) && (name != NULL), NULL); */ +/* UcaPluginManagerPrivate *priv = UCA_PLUGIN_MANAGER_GET_PRIVATE (manager); */ +/* UcaFilter *filter; */ +/* GetFilterFunc *func = NULL; */ +/* GModule *module = NULL; */ +/* gchar *module_name = NULL; */ +/* const gchar *entry_symbol_name = "uca_filter_plugin_new"; */ + +/* func = g_hash_table_lookup (priv->filter_funcs, name); */ + +/* if (func == NULL) { */ +/* module_name = g_strdup_printf ("libucafilter%s.so", name); */ +/* gchar *path = plugin_manager_get_path (priv, module_name); */ + +/* if (path == NULL) { */ +/* g_set_error (error, UCA_PLUGIN_MANAGER_ERROR, UCA_PLUGIN_MANAGER_ERROR_MODULE_NOT_FOUND, */ +/* "Module %s not found", module_name); */ +/* goto handle_error; */ +/* } */ + +/* module = g_module_open (path, G_MODULE_BIND_LAZY); */ +/* g_free (path); */ + +/* if (!module) { */ +/* g_set_error (error, UCA_PLUGIN_MANAGER_ERROR, UCA_PLUGIN_MANAGER_ERROR_MODULE_OPEN, */ +/* "Module %s could not be opened: %s", module_name, g_module_error ()); */ +/* goto handle_error; */ +/* } */ + +/* func = g_malloc0 (sizeof (GetFilterFunc)); */ + +/* if (!g_module_symbol (module, entry_symbol_name, (gpointer *) func)) { */ +/* g_set_error (error, UCA_PLUGIN_MANAGER_ERROR, UCA_PLUGIN_MANAGER_ERROR_SYMBOL_NOT_FOUND, */ +/* "%s is not exported by module %s: %s", entry_symbol_name, module_name, g_module_error ()); */ +/* g_free (func); */ + +/* if (!g_module_close (module)) */ +/* g_warning ("%s", g_module_error ()); */ + +/* goto handle_error; */ +/* } */ + +/* priv->modules = g_slist_append (priv->modules, module); */ +/* g_hash_table_insert (priv->filter_funcs, g_strdup (name), func); */ +/* g_free (module_name); */ +/* } */ + +/* filter = (*func) (); */ +/* uca_filter_set_plugin_name (filter, name); */ +/* g_message ("UcaPluginManager: Created %s-%p", name, (gpointer) filter); */ + +/* return filter; */ + +/* handle_error: */ +/* g_free (module_name); */ +/* return NULL; */ +/* } */ + +static void +uca_plugin_manager_get_property (GObject *object, guint property_id, GValue *value, GParamSpec *pspec) +{ + switch (property_id) { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +uca_plugin_manager_set_property (GObject *object, guint property_id, const GValue *value, GParamSpec *pspec) +{ + switch (property_id) { + default: + G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec); + break; + } +} + +static void +uca_plugin_manager_dispose (GObject *object) +{ + G_OBJECT_CLASS (uca_plugin_manager_parent_class)->dispose (object); +} + +static void +uca_plugin_manager_finalize (GObject *object) +{ + UcaPluginManagerPrivate *priv = UCA_PLUGIN_MANAGER_GET_PRIVATE (object); + + g_list_foreach (priv->search_paths, (GFunc) g_free, NULL); + g_list_free (priv->search_paths); + + G_OBJECT_CLASS (uca_plugin_manager_parent_class)->finalize (object); +} + +static void +uca_plugin_manager_class_init (UcaPluginManagerClass *klass) +{ + GObjectClass *gobject_class = G_OBJECT_CLASS (klass); + gobject_class->get_property = uca_plugin_manager_get_property; + gobject_class->set_property = uca_plugin_manager_set_property; + gobject_class->dispose = uca_plugin_manager_dispose; + gobject_class->finalize = uca_plugin_manager_finalize; + + g_type_class_add_private (klass, sizeof (UcaPluginManagerPrivate)); +} + +static void +uca_plugin_manager_init (UcaPluginManager *manager) +{ + UcaPluginManagerPrivate *priv; + + manager->priv = priv = UCA_PLUGIN_MANAGER_GET_PRIVATE (manager); + priv->search_paths = NULL; + + uca_plugin_manager_add_path (manager, "/usr/lib/uca"); + uca_plugin_manager_add_path (manager, "/usr/lib64/uca"); + uca_plugin_manager_add_path (manager, "/usr/local/lib/uca"); + uca_plugin_manager_add_path (manager, "/usr/local/lib64/uca"); +} |