157 lines
3.7 KiB
C
157 lines
3.7 KiB
C
/*
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* Copyright (C) 2003-2011 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/** \file
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*
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* This header declares the db_plugin class. It describes a
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* plugin API for databases of song metadata.
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*/
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#ifndef MPD_DB_PLUGIN_H
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#define MPD_DB_PLUGIN_H
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#include <glib.h>
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#include <assert.h>
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#include <stdbool.h>
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struct config_param;
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struct db_selection;
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struct db_visitor;
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struct db {
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const struct db_plugin *plugin;
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};
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struct db_plugin {
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const char *name;
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/**
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* Allocates and configures a database.
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*/
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struct db *(*init)(const struct config_param *param, GError **error_r);
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/**
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* Free instance data.
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*/
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void (*finish)(struct db *db);
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/**
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* Open the database. Read it into memory if applicable.
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*/
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bool (*open)(struct db *db, GError **error_r);
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/**
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* Close the database, free allocated memory.
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*/
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void (*close)(struct db *db);
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/**
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* Look up a song (including tag data) in the database.
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*
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* @param the URI of the song within the music directory
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* (UTF-8)
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*/
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struct song *(*get_song)(struct db *db, const char *uri,
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GError **error_r);
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/**
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* Visit the selected entities.
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*/
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bool (*visit)(struct db *db, const struct db_selection *selection,
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const struct db_visitor *visitor, void *ctx,
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GError **error_r);
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};
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G_GNUC_MALLOC
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static inline struct db *
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db_plugin_new(const struct db_plugin *plugin, const struct config_param *param,
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GError **error_r)
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{
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assert(plugin != NULL);
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assert(plugin->init != NULL);
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assert(plugin->finish != NULL);
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assert(plugin->get_song != NULL);
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assert(plugin->visit != NULL);
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assert(error_r == NULL || *error_r == NULL);
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struct db *db = plugin->init(param, error_r);
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assert(db == NULL || db->plugin == plugin);
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assert(db != NULL || error_r == NULL || *error_r != NULL);
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return db;
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}
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static inline void
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db_plugin_free(struct db *db)
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{
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assert(db != NULL);
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assert(db->plugin != NULL);
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assert(db->plugin->finish != NULL);
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db->plugin->finish(db);
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}
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static inline bool
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db_plugin_open(struct db *db, GError **error_r)
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{
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assert(db != NULL);
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assert(db->plugin != NULL);
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return db->plugin->open != NULL
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? db->plugin->open(db, error_r)
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: true;
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}
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static inline void
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db_plugin_close(struct db *db)
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{
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assert(db != NULL);
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assert(db->plugin != NULL);
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if (db->plugin->close != NULL)
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db->plugin->close(db);
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}
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static inline struct song *
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db_plugin_get_song(struct db *db, const char *uri, GError **error_r)
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{
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assert(db != NULL);
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assert(db->plugin != NULL);
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assert(db->plugin->get_song != NULL);
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assert(uri != NULL);
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return db->plugin->get_song(db, uri, error_r);
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}
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static inline bool
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db_plugin_visit(struct db *db, const struct db_selection *selection,
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const struct db_visitor *visitor, void *ctx,
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GError **error_r)
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{
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assert(db != NULL);
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assert(db->plugin != NULL);
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assert(selection != NULL);
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assert(visitor != NULL);
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assert(error_r == NULL || *error_r == NULL);
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return db->plugin->visit(db, selection, visitor, ctx, error_r);
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}
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#endif
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