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/**
* 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);
if (word != NULL)
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 = NULL;
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");
}
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