2 Copyright (C) 2010 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.
22 #include "pbd/stateful_diff_command.h"
23 #include "pbd/property_list.h"
24 #include "pbd/demangle.h"
30 /** Create a new StatefulDiffCommand by examining the changes made to a Stateful
31 * since the last time that clear_changes was called on it.
32 * @param s Stateful object.
35 StatefulDiffCommand::StatefulDiffCommand (boost::shared_ptr<StatefulDestructible> s)
39 _changes = s->get_changes_as_properties (this);
41 /* if the stateful object that this command refers to goes away,
42 be sure to notify owners of this command.
45 s->DropReferences.connect_same_thread (*this, boost::bind (&Destructible::drop_references, this));
48 StatefulDiffCommand::StatefulDiffCommand (boost::shared_ptr<StatefulDestructible> s, XMLNode const & n)
52 const XMLNodeList& children (n.children());
54 for (XMLNodeList::const_iterator i = children.begin(); i != children.end(); ++i) {
55 if ((*i)->name() == X_("Changes")) {
56 _changes = s->property_factory (**i);
60 assert (_changes != 0);
62 /* if the stateful object that this command refers to goes away,
63 be sure to notify owners of this command.
66 s->DropReferences.connect_same_thread (*this, boost::bind (&Destructible::drop_references, this));
69 StatefulDiffCommand::~StatefulDiffCommand ()
77 StatefulDiffCommand::operator() ()
79 boost::shared_ptr<Stateful> s (_object.lock());
82 s->apply_changes (*_changes);
87 StatefulDiffCommand::undo ()
89 boost::shared_ptr<Stateful> s (_object.lock());
92 PropertyList p = *_changes;
99 StatefulDiffCommand::get_state ()
101 boost::shared_ptr<Stateful> s (_object.lock());
104 /* XXX should we throw? */
105 return * new XMLNode("");
108 XMLNode* node = new XMLNode (X_("StatefulDiffCommand"));
110 node->add_property ("obj-id", s->id().to_s());
111 node->add_property ("type-name", demangled_name (*s.get()));
113 XMLNode* changes = new XMLNode (X_("Changes"));
115 _changes->get_changes_as_xml (changes);
117 node->add_child_nocopy (*changes);
123 StatefulDiffCommand::empty () const
125 return _changes->empty();