/**
* Sets the activity state depending on the time. This method (1) checks to see if the node has
* gone active or inactive, (2) determines if this node needs to be serviced by the time clock,
* and (3) registers or unregisters for time callbacks accordingly.
*
* @param time The current clock time
*/
private void resetTimeListener(double time) {
// time, start and stop times may have changed
// 1: determine if active state changes
if (vfIsActive) {
// consider stopping if stopTime < time
if ((vfStopTime > vfStartTime) && (time >= vfStopTime)) {
setIsActive(false);
}
} else {
// consider starting if startTime <= time < stopTime
if (vfStartTime <= time && (vfStopTime < vfStartTime || vfStopTime > time)) {
setIsActive(true);
}
}
// 2: determine new listening state
boolean newListening = false; // should I listen?
if (vfIsActive) {
// listen if now active and stop time is set
if (vfStopTime > vfStartTime) {
newListening = true;
}
} else {
// listen if inactive and start time is in the future
if (vfStartTime >= time) {
newListening = true;
}
}
// 3: change listening state if necessary
if (vrmlClock != null) {
if (newListening != isTimeListening) {
if (isTimeListening) {
// stop listening to ticks
vrmlClock.removeTimeListener(this);
} else {
// start listening to ticks
vrmlClock.addTimeListener(this);
}
isTimeListening = newListening;
}
}
}
/**
* Set a new value for the stop time. If the sensor is active and the stop time is less than the
* current start time, it is ignored. If the stop time is less that now, it is set to now.
*
* @param newStopTime The new stop time
*/
public void setStopTime(double newStopTime) {
// Debug.trace();
if (vfIsActive && (newStopTime < vfStartTime)) {
// ignore stoptime if active and new time is less than start time.
} else {
// superclass will fire the fieldChanged events
super.setStopTime(newStopTime);
if (vrmlClock == null) resetTimeListener(0);
else resetTimeListener(vrmlClock.getTime());
}
}
/**
* Set a new value for the start time. If the sensor is active then it is ignored (as per the
* spec).
*
* @param newStartTime The new start time
*/
public void setStartTime(double newStartTime) {
// Debug.trace();
if (vfIsActive) {
// ignore starttime while active
} else {
// superclass will fire the fieldChanged events
super.setStartTime(newStartTime);
if (vrmlClock != null) {
resetTimeListener(vrmlClock.getTime());
}
}
}
/**
* Set the vrmlClock that this time dependent node will be running with.
*
* @param clk The vrmlClock to use for this node
*/
public void setVRMLClock(VRMLClock clk) {
vrmlClock = clk;
resetTimeListener(vrmlClock.getTime());
}
