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package tim.prune.data;
/**
* Class to hold either a horizontal speed or a vertical speed
* including the units
*/
public class Speed
{
private double _value = 0.0;
private Unit _unit = null;
private boolean _valid = false;
/**
* Constructor
* @param inValue value
* @param inUnit unit, such as m/s or km/h
*/
public Speed(double inValue, Unit inUnit)
{
_value = inValue;
_unit = inUnit;
_valid = isValidUnit(inUnit);
}
/**
* Constructor
* @param inValue value as string
* @param inUnit unit, such as m/s or km/h
*/
public Speed(String inValue, Unit inUnit)
{
try {
_value = Double.parseDouble(inValue);
_unit = inUnit;
_valid = isValidUnit(inUnit);
}
catch (Exception e)
{
_valid = false;
}
}
/**
* Check if the given unit is valid for a speed
* @param inUnit unit
* @return true if it's valid
*/
private static boolean isValidUnit(Unit inUnit)
{
return inUnit != null && (inUnit == UnitSetLibrary.SPEED_UNITS_METRESPERSEC
|| inUnit == UnitSetLibrary.SPEED_UNITS_KMPERHOUR
|| inUnit == UnitSetLibrary.SPEED_UNITS_FEETPERSEC
|| inUnit == UnitSetLibrary.SPEED_UNITS_MILESPERHOUR
|| inUnit == UnitSetLibrary.SPEED_UNITS_KNOTS);
}
/**
* Invert the speed value, for example when vertical speeds are positive downwards
*/
public void invert() {
if (_valid) _value = -_value;
}
/** @return the numerical value in whatever units they're in */
public double getValue() {return _value;}
/** @return the units they're in */
public Unit getUnit() {return _unit;}
/**
* @return speed value in metres per second
*/
public double getValueInMetresPerSec()
{
if (!_valid) return 0.0;
return _value / _unit.getMultFactorFromStd();
}
/**
* @param inUnit specified speed units
* @return speed value in the specified units
*/
public double getValue(Unit inUnit)
{
if (!_valid || !isValidUnit(inUnit)) return 0.0;
return getValueInMetresPerSec() * inUnit.getMultFactorFromStd();
}
/** @return true if this is valid */
public boolean isValid() {return _valid;}
/**
* Copy the values from the other object into this one, to make this one a clone
* @param inOther other speed object
*/
public void copyFrom(Speed inOther)
{
_value = inOther._value;
_unit = inOther._unit;
_valid = inOther._valid;
}
}
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