1 files changed, 138 insertions, 0 deletions
diff --git a/src/db/Interface.hxx b/src/db/Interface.hxx
new file mode 100644
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+++ b/src/db/Interface.hxx
@@ -0,0 +1,138 @@
+/*
+ * Copyright (C) 2003-2014 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.
+ */
+
+#ifndef MPD_DATABASE_INTERFACE_HXX
+#define MPD_DATABASE_INTERFACE_HXX
+
+#include "Visitor.hxx"
+#include "tag/TagType.h"
+#include "Compiler.h"
+
+#include <time.h>
+#include <stdint.h>
+
+struct DatabasePlugin;
+struct DatabaseStats;
+struct DatabaseSelection;
+struct LightSong;
+class Error;
+
+class Database {
+	const DatabasePlugin &plugin;
+
+public:
+	Database(const DatabasePlugin &_plugin)
+		:plugin(_plugin) {}
+
+	/**
+	 * Free instance data.
+         */
+	virtual ~Database() {}
+
+	const DatabasePlugin &GetPlugin() const {
+		return plugin;
+	}
+
+	bool IsPlugin(const DatabasePlugin &other) const {
+		return &plugin == &other;
+	}
+
+	/**
+         * Open the database.  Read it into memory if applicable.
+	 */
+	virtual bool Open(gcc_unused Error &error) {
+		return true;
+	}
+
+	/**
+         * Close the database, free allocated memory.
+	 */
+	virtual void Close() {}
+
+	/**
+         * Look up a song (including tag data) in the database.  When
+         * you don't need this anymore, call ReturnSong().
+	 *
+	 * @param uri_utf8 the URI of the song within the music
+	 * directory (UTF-8)
+	 */
+	virtual const LightSong *GetSong(const char *uri_utf8,
+					 Error &error) const = 0;
+
+	/**
+	 * Mark the song object as "unused".  Call this on objects
+	 * returned by GetSong().
+	 */
+	virtual void ReturnSong(const LightSong *song) const = 0;
+
+	/**
+	 * Visit the selected entities.
+	 */
+	virtual bool Visit(const DatabaseSelection &selection,
+			   VisitDirectory visit_directory,
+			   VisitSong visit_song,
+			   VisitPlaylist visit_playlist,
+			   Error &error) const = 0;
+
+	bool Visit(const DatabaseSelection &selection,
+		   VisitDirectory visit_directory,
+		   VisitSong visit_song,
+		   Error &error) const {
+		return Visit(selection, visit_directory, visit_song,
+			     VisitPlaylist(), error);
+	}
+
+	bool Visit(const DatabaseSelection &selection, VisitSong visit_song,
+		   Error &error) const {
+		return Visit(selection, VisitDirectory(), visit_song, error);
+	}
+
+	/**
+	 * Visit all unique tag values.
+	 */
+	virtual bool VisitUniqueTags(const DatabaseSelection &selection,
+				     TagType tag_type, uint32_t group_mask,
+				     VisitTag visit_tag,
+				     Error &error) const = 0;
+
+	virtual bool GetStats(const DatabaseSelection &selection,
+			      DatabaseStats &stats,
+			      Error &error) const = 0;
+
+	/**
+	 * Update the database.  Returns the job id on success, 0 on
+	 * error (with #Error set) and 0 if not implemented (#Error
+	 * not set).
+	 */
+	virtual unsigned Update(gcc_unused const char *uri_utf8,
+				gcc_unused bool discard,
+				gcc_unused Error &error) {
+		/* not implemented: return 0 and don't set an Error */
+		return 0;
+	}
+
+	/**
+	 * Returns the time stamp of the last database update.
+	 * Returns 0 if that is not not known/available.
+	 */
+	gcc_pure
+	virtual time_t GetUpdateStamp() const = 0;
+};
+
+#endif