DatabaseSelection: add method Match()

Makefile.am

@@ -268,7 +268,7 @@ src_mpd_SOURCES = \
 	src/db_save.c src/db_save.h \
 	src/DatabasePlugin.hxx \
 	src/DatabaseVisitor.hxx \
-	src/DatabaseSelection.hxx \
+	src/DatabaseSelection.cxx src/DatabaseSelection.hxx \
 	src/exclude.c \
 	src/fd_util.c \
 	src/fifo_buffer.c src/fifo_buffer.h \
@@ -1063,6 +1063,7 @@ test_DumpDatabase_LDADD = \
 	$(GLIB_LIBS)
 test_DumpDatabase_SOURCES = test/DumpDatabase.cxx \
 	src/DatabaseRegistry.cxx \
+	src/DatabaseSelection.cxx \
 	src/Directory.cxx src/directory_save.c \
 	src/playlist_vector.c src/playlist_database.c \
 	src/db_lock.c src/db_save.c \

src/DatabaseSelection.cxx

@@ -0,0 +1,27 @@
+/*
+ * 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.
+ */
+
+#include "DatabaseSelection.hxx"
+#include "SongFilter.hxx"
+
+bool
+DatabaseSelection::Match(const song &song) const
+{
+	return match == nullptr || locate_list_song_match(&song, match);
+}

src/DatabaseSelection.hxx

@@ -26,6 +26,7 @@
 #include <stddef.h>
 
 struct locate_item_list;
+struct song;
 
 struct DatabaseSelection {
 	/**
@@ -47,6 +48,9 @@ struct DatabaseSelection {
 		:uri(_uri), recursive(_recursive), match(_match) {
 		assert(uri != NULL);
 	}
+
+	gcc_pure
+	bool Match(const song &song) const;
 };
 
 #endif

src/db/SimpleDatabasePlugin.cxx

@@ -269,8 +269,7 @@ SimpleDatabase::Visit(const DatabaseSelection &selection,
 		struct song *song;
 		if (visit_song &&
 		    (song = GetSong(selection.uri, NULL)) != NULL &&
-		    (selection.match == NULL ||
-		     locate_list_song_match(song, selection.match)))
+		    selection.Match(*song))
 			return visit_song(*song, error_r);
 
 		g_set_error(error_r, db_quark(), DB_NOT_FOUND,