Path: new class "Path" wraps filesystem path strings

src/db/SimpleDatabasePlugin.cxx

@@ -68,7 +68,7 @@ SimpleDatabase::Configure(const struct config_param *param, GError **error_r)
 		return false;
 	}
 
-	path = _path;
+	path = Path::FromUTF8(_path);
 	free(_path);
 
 	return true;
@@ -77,6 +77,7 @@ SimpleDatabase::Configure(const struct config_param *param, GError **error_r)
 bool
 SimpleDatabase::Check(GError **error_r) const
 {
+	assert(!path.IsNull());
 	assert(!path.empty());
 
 	/* Check if the file exists */
@@ -153,7 +154,7 @@ SimpleDatabase::Load(GError **error_r)
 	assert(!path.empty());
 	assert(root != NULL);
 
-	TextFile file(path.c_str());
+	TextFile file(path);
 	if (file.HasFailed()) {
 		g_set_error(error_r, simple_db_quark(), errno,
 			    "Failed to open database file \"%s\": %s",

src/db/SimpleDatabasePlugin.hxx

@@ -21,17 +21,17 @@
 #define MPD_SIMPLE_DATABASE_PLUGIN_HXX
 
 #include "DatabasePlugin.hxx"
+#include "Path.hxx"
 #include "gcc.h"
 
 #include <cassert>
-#include <string>
 
 #include <time.h>
 
 struct Directory;
 
 class SimpleDatabase : public Database {
-	std::string path;
+	Path path;
 
 	Directory *root;
 
@@ -41,6 +41,9 @@ class SimpleDatabase : public Database {
 	unsigned borrowed_song_count;
 #endif
 
+	SimpleDatabase()
+		:path(Path::Null()) {}
+
 public:
 	gcc_pure
 	Directory *GetRoot() {