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

   1 package com.billkuker.rocketry.motorsim.fuel;\r
   2 \r
   3 import java.util.NoSuchElementException;\r
   4 import java.util.SortedMap;\r
   5 import java.util.TreeMap;\r
   6 \r
   7 import javax.measure.quantity.Pressure;\r
   8 \r
   9 import org.apache.log4j.Logger;\r
  10 import org.jscience.physics.amount.Amount;\r
  11 \r
  12 public abstract class PiecewiseSaintRobertFuel extends SaintRobertFuel {\r
  13         \r
  14         private static final Logger log = Logger.getLogger(PiecewiseSaintRobertFuel.class);\r
  15 \r
  16         private class Entry{\r
  17                 double a;\r
  18                 double n;\r
  19         }\r
  20         \r
  21         private SortedMap<Amount<Pressure>, Entry> entries = new TreeMap<Amount<Pressure>, Entry>();\r
  22         \r
  23         protected PiecewiseSaintRobertFuel(Type t) {\r
  24                 super(t);\r
  25         }\r
  26         \r
  27         protected void add(Amount<Pressure> p, final double _a, final double _n){\r
  28                 entries.put(p, new Entry(){{a = _a; n = _n;}});\r
  29         }\r
  30         \r
  31         protected void clear(){\r
  32                 entries.clear();\r
  33         }\r
  34 \r
  35         @Override\r
  36         protected double burnrateCoefficient(Amount<Pressure> pressure) {\r
  37                 try {\r
  38                         Amount<Pressure> samplePressure = entries.tailMap(pressure).firstKey();\r
  39                         Entry e = entries.get(samplePressure);\r
  40                         return e.a;\r
  41                 } catch ( NoSuchElementException e ){\r
  42                         log.warn("Pressure " + pressure + " is outside of expiermental range for " + this.getClass().getSimpleName());\r
  43                         try {\r
  44                                 return entries.get(entries.lastKey()).a;\r
  45                         } catch ( NoSuchElementException ee ){\r
  46                                 log.error("No data to return!");\r
  47                                 return 0;\r
  48                         }\r
  49                 }\r
  50         }\r
  51 \r
  52         @Override\r
  53         protected double burnrateExponent(Amount<Pressure> pressure) {\r
  54                 try {\r
  55                         Amount<Pressure> samplePressure = entries.tailMap(pressure).firstKey();\r
  56                         Entry e = entries.get(samplePressure);\r
  57                         return e.n;\r
  58                 } catch ( NoSuchElementException e ){\r
  59                         log.warn("Pressure " + pressure + " is outside of expiermental range for " + this.getClass().getSimpleName());\r
  60                         try{\r
  61                                 return entries.get(entries.lastKey()).n;\r
  62                         } catch ( NoSuchElementException ee ){\r
  63                                 log.error("No data to return!");\r
  64                                 return 0;\r
  65                         }\r
  66                 }\r
  67         }\r
  68 \r
  69 }\r