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