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livetrax/libs/pbd/stateful.cc

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/*
Copyright (C) 2000-2001 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.
$Id: stateful.cc 629 2006-06-21 23:01:03Z paul $
*/
#include <unistd.h>
#include "pbd/debug.h"
#include "pbd/stateful.h"
#include "pbd/property_list.h"
#include "pbd/properties.h"
#include "pbd/destructible.h"
#include "pbd/filesystem.h"
#include "pbd/xml++.h"
#include "pbd/error.h"
#include "i18n.h"
using namespace std;
namespace PBD {
int Stateful::current_state_version = 0;
int Stateful::loading_state_version = 0;
Stateful::Stateful ()
: _frozen (0)
, _properties (new OwnedPropertyList)
{
_extra_xml = 0;
_instant_xml = 0;
}
Stateful::~Stateful ()
{
delete _properties;
// Do not delete _extra_xml. The use of add_child_nocopy()
// means it needs to live on indefinately.
delete _instant_xml;
}
void
Stateful::add_extra_xml (XMLNode& node)
{
if (_extra_xml == 0) {
_extra_xml = new XMLNode ("Extra");
}
_extra_xml->remove_nodes (node.name());
_extra_xml->add_child_nocopy (node);
}
XMLNode *
Stateful::extra_xml (const string& str)
{
if (_extra_xml == 0) {
return 0;
}
const XMLNodeList& nlist = _extra_xml->children();
XMLNodeConstIterator i;
for (i = nlist.begin(); i != nlist.end(); ++i) {
if ((*i)->name() == str) {
return (*i);
}
}
return 0;
}
void
Stateful::add_instant_xml (XMLNode& node, const sys::path& directory_path)
{
sys::create_directories (directory_path); // may throw
if (_instant_xml == 0) {
_instant_xml = new XMLNode ("instant");
}
_instant_xml->remove_nodes_and_delete (node.name());
_instant_xml->add_child_copy (node);
sys::path instant_xml_path(directory_path);
instant_xml_path /= "instant.xml";
XMLTree tree;
tree.set_filename(instant_xml_path.to_string());
/* Important: the destructor for an XMLTree deletes
all of its nodes, starting at _root. We therefore
cannot simply hand it our persistent _instant_xml
node as its _root, because we will lose it whenever
the Tree goes out of scope.
So instead, copy the _instant_xml node (which does
a deep copy), and hand that to the tree.
*/
XMLNode* copy = new XMLNode (*_instant_xml);
tree.set_root (copy);
if (!tree.write()) {
error << string_compose(_("Error: could not write %1"), instant_xml_path.to_string()) << endmsg;
}
}
XMLNode *
Stateful::instant_xml (const string& str, const sys::path& directory_path)
{
if (_instant_xml == 0) {
sys::path instant_xml_path(directory_path);
instant_xml_path /= "instant.xml";
if (exists(instant_xml_path)) {
XMLTree tree;
if (tree.read(instant_xml_path.to_string())) {
_instant_xml = new XMLNode(*(tree.root()));
} else {
warning << string_compose(_("Could not understand XML file %1"), instant_xml_path.to_string()) << endmsg;
return 0;
}
} else {
return 0;
}
}
const XMLNodeList& nlist = _instant_xml->children();
XMLNodeConstIterator i;
for (i = nlist.begin(); i != nlist.end(); ++i) {
if ((*i)->name() == str) {
return (*i);
}
}
return 0;
}
/** Forget about any changes to this object's properties */
void
Stateful::clear_changes ()
{
for (OwnedPropertyList::iterator i = _properties->begin(); i != _properties->end(); ++i) {
i->second->clear_changes ();
}
}
PropertyList *
Stateful::get_changes_as_properties (Command* cmd) const
{
PropertyList* pl = new PropertyList;
for (OwnedPropertyList::const_iterator i = _properties->begin(); i != _properties->end(); ++i) {
i->second->get_changes_as_properties (*pl, cmd);
}
return pl;
}
/** Set our property values from an XML node.
* Derived types can call this from set_state() (or elsewhere)
* to get basic property setting done.
* @return IDs of properties that were changed.
*/
PropertyChange
Stateful::set_values (XMLNode const & node)
{
PropertyChange c;
for (OwnedPropertyList::iterator i = _properties->begin(); i != _properties->end(); ++i) {
if (i->second->set_value (node)) {
c.add (i->first);
}
}
post_set (c);
return c;
}
PropertyChange
Stateful::apply_changes (const PropertyList& property_list)
{
PropertyChange c;
PropertyList::const_iterator p;
DEBUG_TRACE (DEBUG::Stateful, string_compose ("Stateful %1 setting properties from list of %2\n", this, property_list.size()));
for (PropertyList::const_iterator pp = property_list.begin(); pp != property_list.end(); ++pp) {
DEBUG_TRACE (DEBUG::Stateful, string_compose ("in plist: %1\n", pp->second->property_name()));
}
for (PropertyList::const_iterator i = property_list.begin(); i != property_list.end(); ++i) {
if ((p = _properties->find (i->first)) != _properties->end()) {
DEBUG_TRACE (
DEBUG::Stateful,
string_compose ("actually setting property %1 using %2\n", p->second->property_name(), i->second->property_name())
);
if (apply_changes (*i->second)) {
c.add (i->first);
}
} else {
DEBUG_TRACE (DEBUG::Stateful, string_compose ("passed in property %1 not found in own property list\n",
i->second->property_name()));
}
}
post_set (c);
send_change (c);
return c;
}
/** Add property states to an XML node.
* @param owner_state Node.
*/
void
Stateful::add_properties (XMLNode& owner_state)
{
for (OwnedPropertyList::iterator i = _properties->begin(); i != _properties->end(); ++i) {
i->second->get_value (owner_state);
}
}
void
Stateful::add_property (PropertyBase& s)
{
_properties->add (s);
}
void
Stateful::send_change (const PropertyChange& what_changed)
{
if (what_changed.empty()) {
return;
}
{
Glib::Mutex::Lock lm (_lock);
if (_frozen) {
_pending_changed.add (what_changed);
return;
}
}
PropertyChanged (what_changed);
}
void
Stateful::suspend_property_changes ()
{
_frozen++;
}
void
Stateful::resume_property_changes ()
{
PropertyChange what_changed;
{
Glib::Mutex::Lock lm (_lock);
if (_frozen && --_frozen > 0) {
return;
}
if (!_pending_changed.empty()) {
what_changed = _pending_changed;
_pending_changed.clear ();
}
}
mid_thaw (what_changed);
send_change (what_changed);
}
bool
Stateful::changed() const
{
for (OwnedPropertyList::const_iterator i = _properties->begin(); i != _properties->end(); ++i) {
if (i->second->changed()) {
return true;
}
}
return false;
}
bool
Stateful::apply_changes (const PropertyBase& prop)
{
OwnedPropertyList::iterator i = _properties->find (prop.property_id());
if (i == _properties->end()) {
return false;
}
i->second->apply_changes (&prop);
return true;
}
PropertyList*
Stateful::property_factory (const XMLNode& history_node) const
{
PropertyList* prop_list = new PropertyList;
for (OwnedPropertyList::const_iterator i = _properties->begin(); i != _properties->end(); ++i) {
PropertyBase* prop = i->second->clone_from_xml (history_node);
if (prop) {
prop_list->add (prop);
}
}
return prop_list;
}
void
Stateful::rdiff (vector<Command*>& cmds) const
{
for (OwnedPropertyList::const_iterator i = _properties->begin(); i != _properties->end(); ++i) {
i->second->rdiff (cmds);
}
}
void
Stateful::clear_owned_changes ()
{
for (OwnedPropertyList::iterator i = _properties->begin(); i != _properties->end(); ++i) {
i->second->clear_owned_changes ();
}
}
} // namespace PBD