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