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-rw-r--r--src/db_plugin.h111
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diff --git a/src/db_plugin.h b/src/db_plugin.h
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+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/** \file
+ *
+ * This header declares the db_plugin class. It describes a
+ * plugin API for databases of song metadata.
+ */
+
+#ifndef MPD_DB_PLUGIN_H
+#define MPD_DB_PLUGIN_H
+
+#include <glib.h>
+#include <assert.h>
+#include <stdbool.h>
+
+struct config_param;
+
+struct db {
+ const struct db_plugin *plugin;
+};
+
+struct db_plugin {
+ const char *name;
+
+ /**
+ * Allocates and configures a database.
+ */
+ struct db *(*init)(const struct config_param *param, GError **error_r);
+
+ /**
+ * Free instance data.
+ */
+ void (*finish)(struct db *db);
+
+ /**
+ * Open the database. Read it into memory if applicable.
+ */
+ bool (*open)(struct db *db, GError **error_r);
+
+ /**
+ * Close the database, free allocated memory.
+ */
+ void (*close)(struct db *db);
+};
+
+G_GNUC_MALLOC
+static inline struct db *
+db_plugin_new(const struct db_plugin *plugin, const struct config_param *param,
+ GError **error_r)
+{
+ assert(plugin != NULL);
+ assert(plugin->init != NULL);
+ assert(plugin->finish != NULL);
+ assert(error_r == NULL || *error_r == NULL);
+
+ struct db *db = plugin->init(param, error_r);
+ assert(db == NULL || db->plugin == plugin);
+ assert(db != NULL || error_r == NULL || *error_r != NULL);
+
+ return db;
+}
+
+static inline void
+db_plugin_free(struct db *db)
+{
+ assert(db != NULL);
+ assert(db->plugin != NULL);
+ assert(db->plugin->finish != NULL);
+
+ db->plugin->finish(db);
+}
+
+static inline bool
+db_plugin_open(struct db *db, GError **error_r)
+{
+ assert(db != NULL);
+ assert(db->plugin != NULL);
+
+ return db->plugin->open != NULL
+ ? db->plugin->open(db, error_r)
+ : true;
+}
+
+static inline void
+db_plugin_close(struct db *db)
+{
+ assert(db != NULL);
+ assert(db->plugin != NULL);
+
+ if (db->plugin->close != NULL)
+ db->plugin->close(db);
+}
+
+#endif