/**
* Sets the input, buoyancy profile.
*
* @param buoyProfile The input, buoyancy profile.
* @throws TypeException if the domain quantity isn't pressure or the range quantity isn't volume
* per mass.
* @throws VisADException if a VisAD failure occurs.
* @throws RemoteException if a Java RMI failure occurs.
*/
public void setBuoyancyProfile(Field buoyProfile)
throws TypeException, VisADException, RemoteException {
FunctionType funcType = (FunctionType) buoyProfile.getType();
RealTupleType domainType = funcType.getDomain();
if (!Pressure.getRealType().equalsExceptNameButUnits(domainType)) {
throw new TypeException(domainType.toString());
}
MathType rangeType = funcType.getRange();
if (!CapeBean.massicVolume.equalsExceptNameButUnits(rangeType)) {
throw new TypeException(rangeType.toString());
}
this.buoyProfile = buoyProfile;
}
/**
* Computes the output Level of Free Convection (LFC) from an (AirPressure -> MassicVolume)
* buoyancy profile.
*
* @param datums The input data in the same order as during construction: <code>datums[0]
* </code> is the input buoyancy profile.
* @return The pressure at the LFC of the buoyancy profile.
* @throws ClassCastException if an input data reference has the wrong type of data object.
* @throws TypeException if a VisAD data object has the wrong type.
* @throws VisADException if a VisAD failure occurs.
* @throws RemoteException if a Java RMI failure occurs.
* @throws IllegalArgumentException if the profile is not ascending.
*/
protected Data compute(Data[] datums) throws TypeException, VisADException, RemoteException {
Field buoyProfile = (Field) datums[0];
Real lfc = noData; // default return value
if (buoyProfile != null) {
FunctionType funcType = (FunctionType) buoyProfile.getType();
RealTupleType domainType = funcType.getDomain();
if (!Pressure.getRealType().equalsExceptNameButUnits(domainType)) {
throw new TypeException(domainType.toString());
}
MathType rangeType = funcType.getRange();
Util.vetType(MassicVolume.getRealType(), buoyProfile);
Set domainSet = buoyProfile.getDomainSet();
double[] pressures = domainSet.getDoubles()[0];
float[] buoys = buoyProfile.getFloats()[0];
if (pressures.length > 1) {
int lastI = pressures.length - 1;
boolean ascending = pressures[0] >= pressures[lastI];
Unit presUnit = domainSet.getSetUnits()[0];
int i;
if (ascending) {
/*
* For a level of free convection to exist, the lower
* buoyancy must be negative.
*/
for (i = 0; (i < buoys.length) && (buoys[i] >= 0); i++) ;
/*
* To find the level of free convection, ascend to
* positive buoyancy.
*/
while ((++i < buoys.length) && (buoys[i] <= 0)) ;
if (i < buoys.length) {
lfc = interpolatePres(pressures[i], buoys[i], pressures[i - 1], buoys[i - 1], presUnit);
}
} else {
/*
* For a level of free convection to exist, the lower
* buoyancy must be negative.
*/
for (i = lastI; (i >= 0) && (buoys[i] >= 0); i--) ;
/*
* To find the level of free convection, ascend to
* positive buoyancy.
*/
while ((--i >= 0) && (buoys[i] <= 0)) ;
if (i >= 0) {
lfc = interpolatePres(pressures[i], buoys[i], pressures[i + 1], buoys[i + 1], presUnit);
}
}
}
}
return lfc;
}