git.gag.com Git - sw/motorsim/blob - src/com/billkuker/rocketry/motorsim/RocketScience.java

   1 package com.billkuker.rocketry.motorsim;\r
   2 \r
   3 import java.lang.ref.WeakReference;\r
   4 import java.lang.reflect.Field;\r
   5 import java.lang.reflect.Modifier;\r
   6 import java.text.DecimalFormat;\r
   7 import java.text.NumberFormat;\r
   8 import java.util.HashSet;\r
   9 import java.util.Iterator;\r
  10 import java.util.Set;\r
  11 import java.util.prefs.Preferences;\r
  12 \r
  13 import javax.measure.quantity.Pressure;\r
  14 import javax.measure.quantity.Quantity;\r
  15 import javax.measure.unit.NonSI;\r
  16 import javax.measure.unit.ProductUnit;\r
  17 import javax.measure.unit.SI;\r
  18 import javax.measure.unit.Unit;\r
  19 import javax.measure.unit.UnitFormat;\r
  20 \r
  21 import org.apache.log4j.Logger;\r
  22 import org.jscience.physics.amount.Amount;\r
  23 \r
  24 public class RocketScience {\r
  25         private static final Logger log = Logger.getLogger(RocketScience.class);\r
  26         \r
  27         public static Unit<Pressure> PSI = new ProductUnit<Pressure>(NonSI.POUND_FORCE.divide(NonSI.INCH.pow(2)));\r
  28         public static Unit<Impulse> NEWTON_SECOND = new ProductUnit<Impulse>(SI.NEWTON.times(SI.SECOND));\r
  29         public static Unit<Impulse> POUND_SECOND = new ProductUnit<Impulse>(NonSI.POUND_FORCE.times(SI.SECOND));\r
  30         static{\r
  31                 UnitFormat.getInstance().label(PSI, "psi");\r
  32                 UnitFormat.getInstance().label(NEWTON_SECOND, "Ns");\r
  33         }\r
  34 \r
  35         public interface MolarWeight extends Quantity {\r
  36                 public static final Unit<MolarWeight> UNIT = new ProductUnit<MolarWeight>(\r
  37                                 SI.KILOGRAM.divide(SI.MOLE));\r
  38         }\r
  39         \r
  40         public interface Impulse extends Quantity {\r
  41                 public static Unit<Impulse> UNIT = NEWTON_SECOND;\r
  42         }\r
  43         \r
  44         private static HashSet<WeakReference<UnitPreferenceListener>> prefListeners = new HashSet<WeakReference<UnitPreferenceListener>>();\r
  45         public static interface UnitPreferenceListener{\r
  46                 public void preferredUnitsChanged();\r
  47         }\r
  48         public static void addUnitPreferenceListener(UnitPreferenceListener l){\r
  49                 prefListeners.add(new WeakReference<RocketScience.UnitPreferenceListener>(l));\r
  50         }\r
  51 \r
  52         public static enum UnitPreference{\r
  53                 SI(new Unit[]{\r
  54                                 javax.measure.unit.SI.METERS_PER_SECOND,\r
  55                                 javax.measure.unit.SI.MILLIMETER.pow(2),\r
  56                                 javax.measure.unit.SI.MILLIMETER,\r
  57                                 javax.measure.unit.SI.MILLIMETER.divide(javax.measure.unit.SI.SECOND),\r
  58                                 javax.measure.unit.SI.NEWTON,\r
  59                                 javax.measure.unit.SI.GRAM,\r
  60                                 javax.measure.unit.SI.MEGA(javax.measure.unit.SI.PASCAL),\r
  61                                 NEWTON_SECOND\r
  62                 }),\r
  63                 NONSI(new Unit[]{\r
  64                                 javax.measure.unit.NonSI.MILES_PER_HOUR,\r
  65                                 javax.measure.unit.NonSI.INCH.pow(2),\r
  66                                 javax.measure.unit.NonSI.INCH,\r
  67                                 javax.measure.unit.NonSI.POUND_FORCE,\r
  68                                 javax.measure.unit.NonSI.OUNCE,\r
  69                                 javax.measure.unit.NonSI.INCH.divide(javax.measure.unit.SI.SECOND),\r
  70                                 PSI,\r
  71                                 POUND_SECOND\r
  72                 });\r
  73                 \r
  74                 private static UnitPreference preference = SI;\r
  75 \r
  76                 static {\r
  77                         Preferences prefs = Preferences.userNodeForPackage(RocketScience.class);\r
  78                         String p = prefs.get("PreferedUnits", "SI");\r
  79                         preference = UnitPreference.valueOf(p);\r
  80                 }\r
  81                 \r
  82                 public static UnitPreference getUnitPreference(){\r
  83                         return preference;\r
  84                 }\r
  85                 \r
  86                 public static void setUnitPreference( final UnitPreference up ){\r
  87                         if ( preference == up )\r
  88                                 return;\r
  89                         preference = up;\r
  90                         Preferences prefs = Preferences.userNodeForPackage(RocketScience.class);\r
  91                         prefs.put("PreferedUnits", up.toString());\r
  92                         Iterator<WeakReference<UnitPreferenceListener>> weakIter = prefListeners.iterator();\r
  93                         while (weakIter.hasNext()) {\r
  94                                 WeakReference<UnitPreferenceListener> weak = weakIter.next();\r
  95                                 UnitPreferenceListener l = weak.get();\r
  96                                 if (l != null) {\r
  97                                         l.preferredUnitsChanged();\r
  98                                 } else {\r
  99                                         log.debug("Weak reference to UPE is null");\r
 100                                         weakIter.remove();\r
 101                                 }\r
 102                         }\r
 103                 }\r
 104                 \r
 105                 protected Set<Unit<?>> units = new HashSet<Unit<?>>();\r
 106                 \r
 107                 UnitPreference( Unit<?> u[] ){\r
 108                         for ( Unit<?> uu : u )\r
 109                                 units.add(uu);\r
 110                 }\r
 111                 \r
 112                 @SuppressWarnings("unchecked")\r
 113                 public <T extends Quantity> Unit<T> getPreferredUnit(Unit<T> u){\r
 114                         if ( units.contains(u) )\r
 115                                 return u;\r
 116                         for( Unit<?> ret : units ){\r
 117                                 if ( ret.isCompatible(u) ){\r
 118                                         return (Unit<T>) ret;\r
 119                                 }\r
 120                         }\r
 121                         return u;\r
 122                 }\r
 123                 \r
 124                 @SuppressWarnings("unchecked")\r
 125                 public <T extends Quantity> Unit<T> getPreferredUnit(Class<T> q){\r
 126                         for( Unit<?> u : units ){\r
 127                                 try {\r
 128                                         return u.asType(q); \r
 129                                 } catch ( ClassCastException e ) {\r
 130                                         //Not compatible\r
 131                                 }\r
 132                         }\r
 133                         try {\r
 134                                 Field f = q.getDeclaredField("UNIT");\r
 135                                 if ( Modifier.isStatic(f.getModifiers()) ){\r
 136                                         if ( Unit.class.isAssignableFrom(f.getType())){\r
 137                                                 return (Unit<T>)f.get(null);\r
 138                                         }\r
 139                                 }\r
 140                         } catch (SecurityException e) {\r
 141                                 e.printStackTrace();\r
 142                         } catch (NoSuchFieldException e) {\r
 143                                 e.printStackTrace();\r
 144                         } catch (IllegalArgumentException e) {\r
 145                                 log.error(e);\r
 146                         } catch (IllegalAccessException e) {\r
 147                                 log.error(e);\r
 148                         }\r
 149                         return null;\r
 150                 }\r
 151         }\r
 152 \r
 153         public static <T extends Quantity> String ammountToString(Amount<T> a) {\r
 154                 if ( a == null )\r
 155                         return "Null";\r
 156                 final NumberFormat nf = new DecimalFormat("##########.###");\r
 157                 return nf.format(a.doubleValue(a.getUnit())) + " " + a.getUnit();\r
 158         }\r
 159         \r
 160         @SuppressWarnings("unchecked")\r
 161         public static <T extends Quantity> String ammountToRoundedString(Amount<T> a) {\r
 162                 if (a == null)\r
 163                         return "Null";\r
 164                 Unit<T> u = RocketScience.UnitPreference.preference.getPreferredUnit(a\r
 165                                 .getUnit());\r
 166                 double d = a.doubleValue(u);\r
 167 \r
 168                 DecimalFormat df;\r
 169                 \r
 170                 if (u == SI.MILLIMETER && d > 1000.0) {\r
 171                         u = (Unit<T>) SI.METER;\r
 172                         d = d / 1000.0;\r
 173                 } else if (u == NonSI.INCH && d > 12.0) {\r
 174                         u = (Unit<T>) NonSI.FOOT;\r
 175                         d = d / 12.0;\r
 176                 }\r
 177 \r
 178                 if (Math.abs(d) < 10.0) {\r
 179                         df = new DecimalFormat("#.##");\r
 180                 } else if (Math.abs(d) < 100.0) {\r
 181                         df = new DecimalFormat("#.#");\r
 182                 } else {\r
 183                         df = new DecimalFormat("#");\r
 184                 }\r
 185 \r
 186                 return df.format(d) + " " + u.toString();\r
 187         }\r
 188 \r
 189 }\r