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