From 2d7e7b3df6967a86d85edcbb186be818f7474eef Mon Sep 17 00:00:00 2001
From: James Turner <zakalawe@mac.com>
Date: Tue, 10 Nov 2020 11:40:12 +0000
Subject: [PATCH] Waypoints: use bool returns for load errors
Avoid using exception throws for malformed input, makes error
reporting very noisy when user-generated flight plans are loaded.
---
src/Navaids/FlightPlan.cxx | 4 +
src/Navaids/route.cxx | 38 ++++----
src/Navaids/route.hxx | 16 ++--
src/Navaids/waypoint.cxx | 174 ++++++++++++++++++++++---------------
src/Navaids/waypoint.hxx | 75 ++++++++--------
5 files changed, 172 insertions(+), 135 deletions(-)
diff --git a/src/Navaids/FlightPlan.cxx b/src/Navaids/FlightPlan.cxx
index 840e8616b..421494c90 100644
--- a/src/Navaids/FlightPlan.cxx
+++ b/src/Navaids/FlightPlan.cxx
@@ -1198,6 +1198,10 @@ void FlightPlan::loadVersion2XMLRoute(SGPropertyNode_ptr routeData)
if (routeNode.valid()) {
for (auto wpNode : routeNode->getChildren("wp")) {
auto wp = Waypt::createFromProperties(this, wpNode);
+ if (!wp) {
+ continue;
+ }
+
LegRef l = new Leg{this, wp};
// sync leg restrictions with waypoint ones
if (wp->speedRestriction() != RESTRICT_NONE) {
diff --git a/src/Navaids/route.cxx b/src/Navaids/route.cxx
index 2990f0b3a..fa77b2c0c 100644
--- a/src/Navaids/route.cxx
+++ b/src/Navaids/route.cxx
@@ -236,8 +236,8 @@ WayptRef Waypt::createInstance(RouteBase* aOwner, const std::string& aTypeName)
WayptRef Waypt::createFromProperties(RouteBase* aOwner, SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("type")) {
- throw sg_io_exception("bad props node, no type provided",
- "Waypt::createFromProperties");
+ SG_LOG(SG_GENERAL, SG_WARN, "Bad waypoint node: missing type");
+ return {};
}
flightgear::AirwayRef via;
@@ -250,22 +250,24 @@ WayptRef Waypt::createFromProperties(RouteBase* aOwner, SGPropertyNode_ptr aProp
}
}
- try {
WayptRef nd(createInstance(aOwner, aProp->getStringValue("type")));
- nd->initFromProperties(aProp);
- return nd;
- } catch (sg_exception& e) {
- SG_LOG(SG_GENERAL, SG_WARN, "failed to create waypoint, trying basic:" << e.getMessage());
- }
+ if (nd->initFromProperties(aProp)) {
+ return nd;
+ }
+ SG_LOG(SG_GENERAL, SG_WARN, "failed to create waypoint, trying basic");
-// if we failed to make the waypoint, try again making a basic waypoint.
-// this handles the case where a navaid waypoint is missing, for example
-// we also reject navaids that don't look correct (too far form the specified
-// lat-lon, eg see https://sourceforge.net/p/flightgear/codetickets/1814/ )
-// and again fallback to here.
- WayptRef nd(new BasicWaypt(aOwner));
- nd->initFromProperties(aProp);
- return nd;
+
+ // if we failed to make the waypoint, try again making a basic waypoint.
+ // this handles the case where a navaid waypoint is missing, for example
+ // we also reject navaids that don't look correct (too far form the specified
+ // lat-lon, eg see https://sourceforge.net/p/flightgear/codetickets/1814/ )
+ // and again fallback to here.
+ WayptRef bw(new BasicWaypt(aOwner));
+ if (bw->initFromProperties(aProp)) {
+ return bw;
+ }
+
+ return {}; // total failure
}
void Waypt::saveAsNode(SGPropertyNode* n) const
@@ -274,7 +276,7 @@ void Waypt::saveAsNode(SGPropertyNode* n) const
writeToProperties(n);
}
-void Waypt::initFromProperties(SGPropertyNode_ptr aProp)
+bool Waypt::initFromProperties(SGPropertyNode_ptr aProp)
{
if (aProp->hasChild("generated")) {
setFlag(WPT_GENERATED, aProp->getBoolValue("generated"));
@@ -314,7 +316,7 @@ void Waypt::initFromProperties(SGPropertyNode_ptr aProp)
_speed = aProp->getDoubleValue("speed");
}
-
+ return true;
}
void Waypt::writeToProperties(SGPropertyNode_ptr aProp) const
diff --git a/src/Navaids/route.hxx b/src/Navaids/route.hxx
index 283456f5d..41a384ac3 100644
--- a/src/Navaids/route.hxx
+++ b/src/Navaids/route.hxx
@@ -208,16 +208,16 @@ protected:
/**
* Persistence helper - read node properties from a file
*/
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
-
- /**
+ virtual bool initFromProperties(SGPropertyNode_ptr aProp);
+
+ /**
* Persistence helper - save this element to a node
*/
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
-
- typedef Waypt* (FactoryFunction)(RouteBase* aOwner) ;
- static void registerFactory(const std::string aNodeType, FactoryFunction* aFactory);
-
+ virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
+
+ typedef Waypt*(FactoryFunction)(RouteBase* aOwner);
+ static void registerFactory(const std::string aNodeType, FactoryFunction* aFactory);
+
double _altitudeFt = 0.0;
double _speed = 0.0; // knots IAS or mach
RouteRestriction _altRestrict = RESTRICT_NONE;
diff --git a/src/Navaids/waypoint.cxx b/src/Navaids/waypoint.cxx
index 9f8d0fa17..03ee819a6 100644
--- a/src/Navaids/waypoint.cxx
+++ b/src/Navaids/waypoint.cxx
@@ -47,18 +47,20 @@ BasicWaypt::BasicWaypt(RouteBase* aOwner) :
{
}
-void BasicWaypt::initFromProperties(SGPropertyNode_ptr aProp)
+bool BasicWaypt::initFromProperties(SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("lon") || !aProp->hasChild("lat")) {
- throw sg_io_exception("missing lon/lat properties",
- "BasicWaypt::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "missing lon/lat properties");
+ return false;
}
- Waypt::initFromProperties(aProp);
+ if (!Waypt::initFromProperties(aProp))
+ return false;
_pos = SGGeod::fromDeg(aProp->getDoubleValue("lon"),
aProp->getDoubleValue("lat"));
_ident = aProp->getStringValue("ident");
+ return true;
}
void BasicWaypt::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -102,15 +104,16 @@ std::string NavaidWaypoint::ident() const
return _navaid->ident();
}
-void NavaidWaypoint::initFromProperties(SGPropertyNode_ptr aProp)
+bool NavaidWaypoint::initFromProperties(SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("ident")) {
- throw sg_io_exception("missing navaid value",
- "NavaidWaypoint::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "missing navaid ident");
+ return false;
}
-
- Waypt::initFromProperties(aProp);
-
+
+ if (!Waypt::initFromProperties(aProp))
+ return false;
+
std::string idn(aProp->getStringValue("ident"));
SGGeod p;
if (aProp->hasChild("lon")) {
@@ -121,8 +124,8 @@ void NavaidWaypoint::initFromProperties(SGPropertyNode_ptr aProp)
// is it sufficent just to ignore DMEs, actually?
FGPositionedRef nav = FGPositioned::findClosestWithIdent(idn, p, nullptr);
if (!nav) {
- throw sg_io_exception("unknown navaid ident:" + idn,
- "NavaidWaypoint::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "unknown navdaid ident:" << idn);
+ return false;
}
if (p.isValid() && (SGGeodesy::distanceM(nav->geod(), p) > 4000)) {
@@ -130,12 +133,12 @@ void NavaidWaypoint::initFromProperties(SGPropertyNode_ptr aProp)
// in this case, throw an exception here so we fall back to using
// a basic waypoint
// see https://sourceforge.net/p/flightgear/codetickets/1814/
- throw sg_io_exception("Waypoint navaid for ident:" + idn +
- " is too far from specified lat/lon in flight-plan",
- "NavaidWaypoint::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "Waypoint navaid for ident:" << idn << " is too far from the specified lat/lon");
+ return false;
}
_navaid = nav;
+ return true;
}
void NavaidWaypoint::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -170,17 +173,20 @@ void OffsetNavaidWaypoint::init()
_geod = SGGeod::fromGeodFt(offset, _altitudeFt);
}
-void OffsetNavaidWaypoint::initFromProperties(SGPropertyNode_ptr aProp)
+bool OffsetNavaidWaypoint::initFromProperties(SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("radial-deg") || !aProp->hasChild("distance-nm")) {
- throw sg_io_exception("missing radial/offset distance",
- "OffsetNavaidWaypoint::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "missing radial/offset distance creating offset waypoint");
+ return false;
}
-
- NavaidWaypoint::initFromProperties(aProp);
+
+ if (!NavaidWaypoint::initFromProperties(aProp))
+ return false;
+
_radial = aProp->getDoubleValue("radial-deg");
_distanceNm = aProp->getDoubleValue("distance-nm");
init();
+ return true;
}
void OffsetNavaidWaypoint::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -224,17 +230,31 @@ double RunwayWaypt::headingRadialDeg() const
return _runway->headingDeg();
}
-void RunwayWaypt::initFromProperties(SGPropertyNode_ptr aProp)
+bool RunwayWaypt::initFromProperties(SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("icao") || !aProp->hasChild("ident")) {
- throw sg_io_exception("missing values: icao or ident",
- "RunwayWaypoint::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "missing ICAO/ident on runway waypoint");
+ return false;
}
-
- Waypt::initFromProperties(aProp);
+
+ if (!Waypt::initFromProperties(aProp))
+ return false;
+
std::string idn(aProp->getStringValue("ident"));
const FGAirport* apt = FGAirport::getByIdent(aProp->getStringValue("icao"));
- _runway = apt->getRunwayByIdent(aProp->getStringValue("ident"));
+ if (!apt) {
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "Unknown airport:" << aProp->getStringValue("icao"));
+ return false;
+ }
+
+ const std::string ident = aProp->getStringValue("ident");
+ if (!apt->hasRunwayWithIdent(ident)) {
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "Unknown runway " << ident << " at " << aProp->getStringValue("icao"));
+ return false;
+ }
+
+ _runway = apt->getRunwayByIdent(ident);
+ return true;
}
void RunwayWaypt::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -286,20 +306,18 @@ void Hold::setLeftHanded()
{
_righthanded = false;
}
-
-void Hold::initFromProperties(SGPropertyNode_ptr aProp)
-{
- BasicWaypt::initFromProperties(aProp);
-
- if (!aProp->hasChild("lon") || !aProp->hasChild("lat")) {
- throw sg_io_exception("missing lon/lat properties",
- "Hold::initFromProperties");
- }
- _righthanded = aProp->getBoolValue("right-handed");
- _isDistance = aProp->getBoolValue("is-distance");
- _bearing = aProp->getDoubleValue("inbound-radial-deg");
- _holdTD = aProp->getDoubleValue("td");
+bool Hold::initFromProperties(SGPropertyNode_ptr aProp)
+{
+ if (!BasicWaypt::initFromProperties(aProp))
+ return false;
+
+ _righthanded = aProp->getBoolValue("right-handed");
+ _isDistance = aProp->getBoolValue("is-distance");
+ _bearing = aProp->getDoubleValue("inbound-radial-deg");
+ _holdTD = aProp->getDoubleValue("td");
+
+ return true;
}
void Hold::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -328,16 +346,19 @@ HeadingToAltitude::HeadingToAltitude(RouteBase* aOwner) :
{
}
-void HeadingToAltitude::initFromProperties(SGPropertyNode_ptr aProp)
+bool HeadingToAltitude::initFromProperties(SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("heading-deg")) {
- throw sg_io_exception("missing heading/alt properties",
- "HeadingToAltitude::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "Missing heading property creating HdgToAlt waypoint");
+ return false;
}
- Waypt::initFromProperties(aProp);
+ if (!Waypt::initFromProperties(aProp))
+ return false;
+
_magHeading = aProp->getDoubleValue("heading-deg");
_ident = aProp->getStringValue("ident");
+ return true;
}
void HeadingToAltitude::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -365,20 +386,23 @@ DMEIntercept::DMEIntercept(RouteBase* aOwner) :
{
}
-void DMEIntercept::initFromProperties(SGPropertyNode_ptr aProp)
+bool DMEIntercept::initFromProperties(SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("lon") || !aProp->hasChild("lat")) {
- throw sg_io_exception("missing lon/lat properties",
- "DMEIntercept::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "Missing lat/lom properties creating DMEIntc waypoint");
+ return false;
}
- Waypt::initFromProperties(aProp);
+ if (!Waypt::initFromProperties(aProp))
+ return false;
+
_pos = SGGeod::fromDeg(aProp->getDoubleValue("lon"), aProp->getDoubleValue("lat"));
_ident = aProp->getStringValue("ident");
// check it's a real DME?
_magCourse = aProp->getDoubleValue("course-deg");
_dmeDistanceNm = aProp->getDoubleValue("dme-distance-nm");
-
+
+ return true;
}
void DMEIntercept::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -409,21 +433,24 @@ RadialIntercept::RadialIntercept(RouteBase* aOwner) :
Waypt(aOwner)
{
}
-
-void RadialIntercept::initFromProperties(SGPropertyNode_ptr aProp)
+
+bool RadialIntercept::initFromProperties(SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("lon") || !aProp->hasChild("lat")) {
- throw sg_io_exception("missing lon/lat properties",
- "RadialIntercept::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "Missing lat/lom properties creating RadialIntercept waypoint");
+ return false;
}
- Waypt::initFromProperties(aProp);
+ if (!Waypt::initFromProperties(aProp))
+ return false;
+
_pos = SGGeod::fromDeg(aProp->getDoubleValue("lon"), aProp->getDoubleValue("lat"));
_ident = aProp->getStringValue("ident");
// check it's a real VOR?
_magCourse = aProp->getDoubleValue("course-deg");
_radial = aProp->getDoubleValue("radial-deg");
-
+
+ return true;
}
void RadialIntercept::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -465,21 +492,21 @@ string ATCVectors::ident() const
return "VECTORS-" + _facility->ident();
}
-void ATCVectors::initFromProperties(SGPropertyNode_ptr aProp)
-{
- if (!aProp->hasChild("icao")) {
- throw sg_io_exception("missing icao propertie",
- "ATCVectors::initFromProperties");
- }
+bool ATCVectors::initFromProperties(SGPropertyNode_ptr aProp)
+{
+ if (!Waypt::initFromProperties(aProp))
+ return false;
- Waypt::initFromProperties(aProp);
- _facility = FGAirport::getByIdent(aProp->getStringValue("icao"));
+ _facility = FGAirport::getByIdent(aProp->getStringValue("icao"));
+ return true;
}
void ATCVectors::writeToProperties(SGPropertyNode_ptr aProp) const
{
Waypt::writeToProperties(aProp);
- aProp->setStringValue("icao", _facility->ident());
+ if (_facility) {
+ aProp->setStringValue("icao", _facility->ident());
+ }
}
/////////////////////////////////////////////////////////////////////////////
@@ -505,8 +532,9 @@ string Discontinuity::ident() const
return "DISCONTINUITY";
}
-void Discontinuity::initFromProperties(SGPropertyNode_ptr aProp)
+bool Discontinuity::initFromProperties(SGPropertyNode_ptr aProp)
{
+ return true;
}
void Discontinuity::writeToProperties(SGPropertyNode_ptr aProp) const
@@ -542,21 +570,22 @@ Via::~Via()
{
}
-void Via::initFromProperties(SGPropertyNode_ptr aProp)
+bool Via::initFromProperties(SGPropertyNode_ptr aProp)
{
if (!aProp->hasChild("airway") || !aProp->hasChild("to")) {
- throw sg_io_exception("missing airway/to properties",
- "Via::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "Missingairway/to properties on Via wp");
+ return false;
}
- Waypt::initFromProperties(aProp);
+ if (!Waypt::initFromProperties(aProp))
+ return false;
const std::string ident = aProp->getStringValue("airway");
const Airway::Level level = static_cast<Airway::Level>(aProp->getIntValue("level", Airway::Both));
_airway = Airway::findByIdent(ident, level);
if (!_airway) {
- throw sg_io_exception("unknown airway ident: '" + ident + "'",
- "Via::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "VIA: unknown airway:" << ident);
+ return false;
}
std::string idn(aProp->getStringValue("to"));
@@ -568,8 +597,8 @@ void Via::initFromProperties(SGPropertyNode_ptr aProp)
FGPositionedRef nav = FGPositioned::findClosestWithIdent(idn, p, nullptr);
if (!nav) {
- throw sg_io_exception("unknown navaid ident:" + idn,
- "Via::initFromProperties");
+ SG_LOG(SG_AUTOPILOT, SG_WARN, "VIA TO navaid: " << idn << " not found");
+ return false;
}
if (!_airway->containsNavaid(nav)) {
@@ -578,6 +607,7 @@ void Via::initFromProperties(SGPropertyNode_ptr aProp)
}
_to = nav;
+ return true;
}
void Via::writeToProperties(SGPropertyNode_ptr aProp) const
diff --git a/src/Navaids/waypoint.hxx b/src/Navaids/waypoint.hxx
index cb67bd147..2aefae9e4 100644
--- a/src/Navaids/waypoint.hxx
+++ b/src/Navaids/waypoint.hxx
@@ -44,10 +44,10 @@ public:
std::string icaoDescription() const override;
protected:
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
- virtual std::string type() const
+ virtual std::string type() const
{ return "basic"; }
SGGeod _pos;
@@ -72,12 +72,13 @@ public:
{ return _navaid; }
virtual std::string ident() const;
-protected:
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
+
+ protected:
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
virtual std::string type() const
- { return "navaid"; }
+ { return "navaid"; }
FGPositionedRef _navaid;
};
@@ -93,10 +94,10 @@ public:
{ return _geod; }
protected:
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
-
- virtual std::string type() const
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
+
+ virtual std::string type() const
{ return "offset-navaid"; }
private:
@@ -132,9 +133,9 @@ public:
protected:
virtual std::string type() const
{ return "runway"; }
-
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
+
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
private:
FGRunway* _runway;
@@ -169,10 +170,10 @@ public:
virtual double headingRadialDeg() const
{ return inboundRadial(); }
protected:
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
-
- virtual std::string type() const
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
+
+ virtual std::string type() const
{ return "hold"; }
private:
@@ -188,10 +189,10 @@ public:
HeadingToAltitude(RouteBase* aOwner, const std::string& aIdent, double aMagHdg);
HeadingToAltitude(RouteBase* aOwner);
-
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
-
+
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
+
virtual std::string type() const
{ return "hdgToAlt"; }
@@ -221,10 +222,10 @@ public:
double aCourseDeg, double aDistanceNm);
DMEIntercept(RouteBase* aOwner);
-
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
-
+
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
+
virtual std::string type() const
{ return "dmeIntercept"; }
@@ -256,10 +257,10 @@ public:
double aCourseDeg, double aRadialDeg);
RadialIntercept(RouteBase* aOwner);
-
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
-
+
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
+
virtual std::string type() const
{ return "radialIntercept"; }
@@ -296,10 +297,10 @@ public:
virtual ~ATCVectors();
ATCVectors(RouteBase* aOwner);
-
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
-
+
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
+
virtual std::string type() const
{ return "vectors"; }
@@ -326,8 +327,8 @@ public:
virtual ~Discontinuity();
Discontinuity(RouteBase* aOwner);
- virtual void initFromProperties(SGPropertyNode_ptr aProp);
- virtual void writeToProperties(SGPropertyNode_ptr aProp) const;
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
+ void writeToProperties(SGPropertyNode_ptr aProp) const override;
virtual std::string type() const
{ return "discontinuity"; }
@@ -348,7 +349,7 @@ public:
Via(RouteBase* aOwner, AirwayRef airway, FGPositionedRef to);
virtual ~Via();
- void initFromProperties(SGPropertyNode_ptr aProp) override;
+ bool initFromProperties(SGPropertyNode_ptr aProp) override;
void writeToProperties(SGPropertyNode_ptr aProp) const override;
std::string type() const override