package com.billkuker.rocketry.motorsim;\r
\r
+import java.lang.ref.WeakReference;\r
import java.lang.reflect.Field;\r
import java.lang.reflect.Modifier;\r
import java.text.DecimalFormat;\r
import java.text.NumberFormat;\r
import java.util.HashSet;\r
+import java.util.Iterator;\r
import java.util.Set;\r
import java.util.prefs.Preferences;\r
\r
import javax.measure.unit.Unit;\r
import javax.measure.unit.UnitFormat;\r
\r
+import org.apache.log4j.Logger;\r
import org.jscience.physics.amount.Amount;\r
\r
public class RocketScience {\r
+ private static final Logger log = Logger.getLogger(RocketScience.class);\r
+ \r
public static Unit<Pressure> PSI = new ProductUnit<Pressure>(NonSI.POUND_FORCE.divide(NonSI.INCH.pow(2)));\r
public static Unit<Impulse> NEWTON_SECOND = new ProductUnit<Impulse>(SI.NEWTON.times(SI.SECOND));\r
public static Unit<Impulse> POUND_SECOND = new ProductUnit<Impulse>(NonSI.POUND_FORCE.times(SI.SECOND));\r
public static Unit<Impulse> UNIT = NEWTON_SECOND;\r
}\r
\r
- private static HashSet<UnitPreferenceListener> prefListeners = new HashSet<RocketScience.UnitPreferenceListener>();\r
+ private static HashSet<WeakReference<UnitPreferenceListener>> prefListeners = new HashSet<WeakReference<UnitPreferenceListener>>();\r
public static interface UnitPreferenceListener{\r
public void preferredUnitsChanged();\r
}\r
public static void addUnitPreferenceListener(UnitPreferenceListener l){\r
- prefListeners.add(l);\r
+ prefListeners.add(new WeakReference<RocketScience.UnitPreferenceListener>(l));\r
}\r
\r
public static enum UnitPreference{\r
SI(new Unit[]{\r
+ javax.measure.unit.SI.METERS_PER_SECOND,\r
+ javax.measure.unit.SI.MILLIMETER.pow(3),\r
javax.measure.unit.SI.MILLIMETER.pow(2),\r
javax.measure.unit.SI.MILLIMETER,\r
javax.measure.unit.SI.MILLIMETER.divide(javax.measure.unit.SI.SECOND),\r
NEWTON_SECOND\r
}),\r
NONSI(new Unit[]{\r
+ javax.measure.unit.NonSI.MILES_PER_HOUR,\r
+ javax.measure.unit.NonSI.INCH.pow(3),\r
javax.measure.unit.NonSI.INCH.pow(2),\r
javax.measure.unit.NonSI.INCH,\r
javax.measure.unit.NonSI.POUND_FORCE,\r
preference = up;\r
Preferences prefs = Preferences.userNodeForPackage(RocketScience.class);\r
prefs.put("PreferedUnits", up.toString());\r
- for ( UnitPreferenceListener l : prefListeners ){\r
- l.preferredUnitsChanged();\r
+ Iterator<WeakReference<UnitPreferenceListener>> weakIter = prefListeners.iterator();\r
+ while (weakIter.hasNext()) {\r
+ WeakReference<UnitPreferenceListener> weak = weakIter.next();\r
+ UnitPreferenceListener l = weak.get();\r
+ if (l != null) {\r
+ l.preferredUnitsChanged();\r
+ } else {\r
+ log.debug("Weak reference to UPE is null");\r
+ weakIter.remove();\r
+ }\r
}\r
}\r
\r
} catch (NoSuchFieldException e) {\r
e.printStackTrace();\r
} catch (IllegalArgumentException e) {\r
- // TODO Auto-generated catch block\r
- e.printStackTrace();\r
+ log.error(e);\r
} catch (IllegalAccessException e) {\r
- // TODO Auto-generated catch block\r
- e.printStackTrace();\r
+ log.error(e);\r
}\r
return null;\r
}\r
return nf.format(a.doubleValue(a.getUnit())) + " " + a.getUnit();\r
}\r
\r
+ @SuppressWarnings("unchecked")\r
public static <T extends Quantity> String ammountToRoundedString(Amount<T> a) {\r
if (a == null)\r
return "Null";\r
double d = a.doubleValue(u);\r
\r
DecimalFormat df;\r
+ \r
+ if (u == SI.MILLIMETER && d > 1000.0) {\r
+ u = (Unit<T>) SI.METER;\r
+ d = d / 1000.0;\r
+ } else if (u == NonSI.INCH && d > 12.0) {\r
+ u = (Unit<T>) NonSI.FOOT;\r
+ d = d / 12.0;\r
+ }\r
\r
if (Math.abs(d) < 10.0) {\r
df = new DecimalFormat("#.##");\r