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/*
Copyright (C) 2010 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pbd/stateful_diff_command.h"
#include "i18n.h"
using namespace std;
using namespace PBD;
/** Create a new StatefulDiffCommand by examining the changes made to a Stateful
* since the last time that clear_history was called on it.
* @param s Stateful object.
*/
StatefulDiffCommand::StatefulDiffCommand (boost::shared_ptr<Stateful> s)
: _object (s)
{
pair<XMLNode *, XMLNode*> const p = s->diff ();
_before = p.first;
_after = p.second;
}
StatefulDiffCommand::StatefulDiffCommand (boost::shared_ptr<Stateful> s, XMLNode const & n)
: _object (s)
{
_before = new XMLNode (*n.children().front());
_after = new XMLNode (*n.children().back());
}
StatefulDiffCommand::~StatefulDiffCommand ()
{
delete _before;
delete _after;
}
void
StatefulDiffCommand::operator() ()
{
boost::shared_ptr<Stateful> s (_object.lock());
if (s) {
s->set_state (*_after, Stateful::current_state_version);
}
}
void
StatefulDiffCommand::undo ()
{
boost::shared_ptr<Stateful> s (_object.lock());
if (s) {
s->set_state (*_before, Stateful::current_state_version);
}
}
XMLNode&
StatefulDiffCommand::get_state ()
{
boost::shared_ptr<Stateful> s (_object.lock());
if (!s) {
/* XXX should we throw? */
return * new XMLNode("");
}
XMLNode* node = new XMLNode (X_("StatefulDiffCommand"));
node->add_property ("obj-id", s->id().to_s());
node->add_property ("type-name", typeid(*s.get()).name());
node->add_child_copy (*_before);
node->add_child_copy (*_after);
return *node;
}
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