2 Copyright (C) 2000-2001 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
18 $Id: stateful.cc 629 2006-06-21 23:01:03Z paul $
23 #include "pbd/stateful.h"
24 #include "pbd/filesystem.h"
25 #include "pbd/xml++.h"
26 #include "pbd/error.h"
34 int Stateful::current_state_version = 0;
35 int Stateful::loading_state_version = 0;
43 Stateful::~Stateful ()
45 // Do not delete _extra_xml. The use of add_child_nocopy()
46 // means it needs to live on indefinately.
52 Stateful::add_extra_xml (XMLNode& node)
54 if (_extra_xml == 0) {
55 _extra_xml = new XMLNode ("Extra");
58 _extra_xml->remove_nodes (node.name());
59 _extra_xml->add_child_nocopy (node);
63 Stateful::extra_xml (const string& str)
65 if (_extra_xml == 0) {
69 const XMLNodeList& nlist = _extra_xml->children();
70 XMLNodeConstIterator i;
72 for (i = nlist.begin(); i != nlist.end(); ++i) {
73 if ((*i)->name() == str) {
82 Stateful::add_instant_xml (XMLNode& node, const sys::path& directory_path)
84 sys::create_directories (directory_path); // may throw
86 if (_instant_xml == 0) {
87 _instant_xml = new XMLNode ("instant");
90 _instant_xml->remove_nodes_and_delete (node.name());
91 _instant_xml->add_child_copy (node);
93 sys::path instant_xml_path(directory_path);
95 instant_xml_path /= "instant.xml";
98 tree.set_filename(instant_xml_path.to_string());
100 /* Important: the destructor for an XMLTree deletes
101 all of its nodes, starting at _root. We therefore
102 cannot simply hand it our persistent _instant_xml
103 node as its _root, because we will lose it whenever
104 the Tree goes out of scope.
106 So instead, copy the _instant_xml node (which does
107 a deep copy), and hand that to the tree.
110 XMLNode* copy = new XMLNode (*_instant_xml);
111 tree.set_root (copy);
114 error << string_compose(_("Error: could not write %1"), instant_xml_path.to_string()) << endmsg;
119 Stateful::instant_xml (const string& str, const sys::path& directory_path)
121 if (_instant_xml == 0) {
123 sys::path instant_xml_path(directory_path);
124 instant_xml_path /= "instant.xml";
126 if (exists(instant_xml_path)) {
128 if (tree.read(instant_xml_path.to_string())) {
129 _instant_xml = new XMLNode(*(tree.root()));
131 warning << string_compose(_("Could not understand XML file %1"), instant_xml_path.to_string()) << endmsg;
139 const XMLNodeList& nlist = _instant_xml->children();
140 XMLNodeConstIterator i;
142 for (i = nlist.begin(); i != nlist.end(); ++i) {
143 if ((*i)->name() == str) {