git.gag.com Git - sw/motorsim/blob - src/com/billkuker/rocketry/motorsim/QuantityChecking.aj

   1 package com.billkuker.rocketry.motorsim;
   2
   3 import java.beans.BeanInfo;
   4 import java.beans.Introspector;
   5 import java.beans.PropertyDescriptor;
   6 import java.lang.reflect.Field;
   7 import java.lang.reflect.ParameterizedType;
   8 import java.lang.reflect.Type;
   9
  10 import javax.measure.unit.Unit;
  11
  12 import org.apache.log4j.Logger;
  13 import org.jscience.physics.amount.Amount;
  14
  15 public aspect QuantityChecking {
  16
  17         private static Logger log = Logger.getLogger(QuantityChecking.class);
  18         public interface Checked {
  19         };
  20
  21         declare parents: Motor || Grain || Chamber || Nozzle || Fuel extends Checked;
  22
  23         @SuppressWarnings("unchecked")
  24         void around(Checked c, Amount amt):
  25                 execution(void Checked+.set*(Amount)) && target(c) && args(amt) {
  26                 try {
  27                         BeanInfo b = Introspector.getBeanInfo(c.getClass());
  28                         PropertyDescriptor ps[] = b.getPropertyDescriptors();
  29                         String name = thisJoinPointStaticPart.getSignature().getName();
  30                         name = name.replaceFirst("set", "");
  31                         for (int i = 0; i < ps.length; i++) {
  32                                 if (ps[i].getName().equals(name)) {
  33                                         Type t = ps[i].getReadMethod().getGenericReturnType();
  34                                         ParameterizedType p = (ParameterizedType) t;
  35                                         Class expected = (Class) p.getActualTypeArguments()[0];
  36                                         Field f = expected.getDeclaredField("UNIT");
  37                                         Unit u = (Unit) f.get(null);
  38
  39                                         Amount a = amt;
  40                                         if (!a.getUnit().isCompatible(u)) {
  41                                                 log.warn("Aspect Expected " + expected
  42                                                                 + " got " + u);
  43
  44                                                 throw new Error(ps[i].getShortDescription()
  45                                                                 + " must be in units of "
  46                                                                 + expected.getSimpleName());
  47                                         }
  48                                 }
  49                         }
  50                 } catch (Exception e) {
  51                         e.printStackTrace();
  52                 }
  53                 proceed(c, amt);
  54         }
  55 }