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.text.DecimalFormat;\r
   4 import java.text.NumberFormat;\r
   5 import java.util.HashSet;\r
   6 import java.util.Set;\r
   7 import java.util.prefs.Preferences;\r
   8 \r
   9 import javax.measure.quantity.Pressure;\r
  10 import javax.measure.quantity.Quantity;\r
  11 import javax.measure.unit.NonSI;\r
  12 import javax.measure.unit.ProductUnit;\r
  13 import javax.measure.unit.SI;\r
  14 import javax.measure.unit.Unit;\r
  15 import javax.measure.unit.UnitFormat;\r
  16 \r
  17 import org.jscience.physics.amount.Amount;\r
  18 \r
  19 public class RocketScience {\r
  20         public static Unit<Pressure> PSI = new ProductUnit<Pressure>(NonSI.POUND_FORCE.divide(NonSI.INCH.pow(2)));\r
  21         public static Unit<Impulse> NEWTON_SECOND = new ProductUnit<Impulse>(SI.NEWTON.times(SI.SECOND));\r
  22         static{\r
  23                 UnitFormat.getInstance().label(PSI, "psi");\r
  24                 UnitFormat.getInstance().label(NEWTON_SECOND, "Ns");\r
  25         }\r
  26 \r
  27         public interface MolarWeight extends Quantity {\r
  28                 public static final Unit<MolarWeight> UNIT = new ProductUnit<MolarWeight>(\r
  29                                 SI.KILOGRAM.divide(SI.MOLE));\r
  30         }\r
  31         \r
  32         public interface Impulse extends Quantity {\r
  33                 public static Unit<Impulse> UNIT = NEWTON_SECOND;\r
  34         }\r
  35 \r
  36         public static enum UnitPreference{\r
  37                 SI(new Unit[]{\r
  38                                 javax.measure.unit.SI.MILLIMETER,\r
  39                                 javax.measure.unit.SI.MILLIMETER.divide(javax.measure.unit.SI.SECOND),\r
  40                                 javax.measure.unit.SI.NEWTON,\r
  41                                 javax.measure.unit.SI.MEGA(javax.measure.unit.SI.PASCAL),\r
  42                                 NEWTON_SECOND\r
  43                 }),\r
  44                 NONSI(new Unit[]{\r
  45                                 javax.measure.unit.NonSI.INCH,\r
  46                                 javax.measure.unit.NonSI.POUND_FORCE,\r
  47                                 javax.measure.unit.NonSI.INCH.divide(javax.measure.unit.SI.SECOND),\r
  48                                 PSI,\r
  49                                 NEWTON_SECOND\r
  50                 });\r
  51                 \r
  52                 private static UnitPreference preference = SI;\r
  53 \r
  54                 static {\r
  55                         Preferences prefs = Preferences.userNodeForPackage(RocketScience.class);\r
  56                         String p = prefs.get("PreferedUnits", "SI");\r
  57                         preference = UnitPreference.valueOf(p);\r
  58                 }\r
  59                 \r
  60                 public static UnitPreference getUnitPreference(){\r
  61                         return preference;\r
  62                 }\r
  63                 \r
  64                 public static void setUnitPreference( final UnitPreference up ){\r
  65                         preference = up;\r
  66                         Preferences prefs = Preferences.userNodeForPackage(RocketScience.class);\r
  67                         prefs.put("PreferedUnits", up.toString());\r
  68                 }\r
  69                 \r
  70                 protected Set<Unit<?>> units = new HashSet<Unit<?>>();\r
  71                 \r
  72                 UnitPreference( Unit<?> u[] ){\r
  73                         for ( Unit<?> uu : u )\r
  74                                 units.add(uu);\r
  75                 }\r
  76                 \r
  77                 @SuppressWarnings("unchecked")\r
  78                 public <T extends Quantity> Unit<T> getPreferredUnit(Unit<T> u){\r
  79                         if ( units.contains(u) )\r
  80                                 return u;\r
  81                         for( Unit<?> ret : units ){\r
  82                                 if ( ret.isCompatible(u) ){\r
  83                                         return (Unit<T>) ret;\r
  84                                 }\r
  85                         }\r
  86                         return u;\r
  87                 }\r
  88         }\r
  89 \r
  90         public static <T extends Quantity> String toString(Amount<T> a) {\r
  91                 final NumberFormat nf = new DecimalFormat("##########.###");\r
  92                 return nf.format(a.doubleValue(a.getUnit())) + " " + a.getUnit();\r
  93         }\r
  94         \r
  95         public static <T extends Quantity> String ammountToRoundedString(Amount<T> a) {\r
  96                 if (a == null)\r
  97                         return "NULL";\r
  98                 Unit<T> u = RocketScience.UnitPreference.preference.getPreferredUnit(a\r
  99                                 .getUnit());\r
 100                 double d = a.doubleValue(u);\r
 101 \r
 102                 DecimalFormat df;\r
 103 \r
 104                 if (Math.abs(d) < 10.0) {\r
 105                         df = new DecimalFormat("#.##");\r
 106                 } else if (Math.abs(d) < 100.0) {\r
 107                         df = new DecimalFormat("#.#");\r
 108                 } else {\r
 109                         df = new DecimalFormat("#");\r
 110                 }\r
 111 \r
 112                 return df.format(d) + " " + u.toString();\r
 113         }\r
 114 \r
 115 }\r