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/destructible.h"
25 #include "pbd/filesystem.h"
26 #include "pbd/xml++.h"
27 #include "pbd/error.h"
35 int Stateful::current_state_version = 0;
36 int Stateful::loading_state_version = 0;
42 static uint32_t change_bit = 1;
44 /* catch out-of-range */
47 fatal << _("programming error: ")
48 << "change_bit out of range in ARDOUR::new_change()"
53 c = Change (change_bit);
54 change_bit <<= 1; // if it shifts too far, change_bit == 0
65 Stateful::~Stateful ()
67 // Do not delete _extra_xml. The use of add_child_nocopy()
68 // means it needs to live on indefinately.
74 Stateful::add_extra_xml (XMLNode& node)
76 if (_extra_xml == 0) {
77 _extra_xml = new XMLNode ("Extra");
80 _extra_xml->remove_nodes (node.name());
81 _extra_xml->add_child_nocopy (node);
85 Stateful::extra_xml (const string& str)
87 if (_extra_xml == 0) {
91 const XMLNodeList& nlist = _extra_xml->children();
92 XMLNodeConstIterator i;
94 for (i = nlist.begin(); i != nlist.end(); ++i) {
95 if ((*i)->name() == str) {
104 Stateful::add_instant_xml (XMLNode& node, const sys::path& directory_path)
106 sys::create_directories (directory_path); // may throw
108 if (_instant_xml == 0) {
109 _instant_xml = new XMLNode ("instant");
112 _instant_xml->remove_nodes_and_delete (node.name());
113 _instant_xml->add_child_copy (node);
115 sys::path instant_xml_path(directory_path);
117 instant_xml_path /= "instant.xml";
120 tree.set_filename(instant_xml_path.to_string());
122 /* Important: the destructor for an XMLTree deletes
123 all of its nodes, starting at _root. We therefore
124 cannot simply hand it our persistent _instant_xml
125 node as its _root, because we will lose it whenever
126 the Tree goes out of scope.
128 So instead, copy the _instant_xml node (which does
129 a deep copy), and hand that to the tree.
132 XMLNode* copy = new XMLNode (*_instant_xml);
133 tree.set_root (copy);
136 error << string_compose(_("Error: could not write %1"), instant_xml_path.to_string()) << endmsg;
141 Stateful::instant_xml (const string& str, const sys::path& directory_path)
143 if (_instant_xml == 0) {
145 sys::path instant_xml_path(directory_path);
146 instant_xml_path /= "instant.xml";
148 if (exists(instant_xml_path)) {
150 if (tree.read(instant_xml_path.to_string())) {
151 _instant_xml = new XMLNode(*(tree.root()));
153 warning << string_compose(_("Could not understand XML file %1"), instant_xml_path.to_string()) << endmsg;
161 const XMLNodeList& nlist = _instant_xml->children();
162 XMLNodeConstIterator i;
164 for (i = nlist.begin(); i != nlist.end(); ++i) {
165 if ((*i)->name() == str) {
173 /** Forget about any old state for this object */
175 Stateful::clear_history ()
177 for (list<StateBase*>::iterator i = _states.begin(); i != _states.end(); ++i) {
178 (*i)->clear_history ();
182 /** @return A pair of XMLNodes representing state that has changed since the last time clear_history
183 * was called on this object; the first is the state before, the second the state after.
185 * It is the caller's responsibility to delete the returned XMLNodes.
187 pair<XMLNode *, XMLNode *>
190 XMLNode* old = new XMLNode (_xml_node_name);
191 XMLNode* current = new XMLNode (_xml_node_name);
193 for (list<StateBase*>::iterator i = _states.begin(); i != _states.end(); ++i) {
194 (*i)->diff (old, current);
197 return make_pair (old, current);
200 /** Set state of _states from an XML node.
202 * @return Changes made.
205 Stateful::set_state_using_states (XMLNode const & node)
207 Change c = Change (0);
209 for (list<StateBase*>::iterator i = _states.begin(); i != _states.end(); ++i) {
210 c = Change (c | (*i)->set_state (node));
216 /** Add state of _states to an XML node.
220 Stateful::add_states (XMLNode & node)
222 for (list<StateBase*>::iterator i = _states.begin(); i != _states.end(); ++i) {
223 (*i)->add_state (node);