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.beans.PropertyVetoException;
   7 import java.lang.reflect.Field;
   8 import java.lang.reflect.ParameterizedType;
   9 import java.lang.reflect.Type;
  10
  11 import javax.measure.unit.Unit;
  12
  13 import org.jscience.physics.amount.Amount;
  14 import com.billkuker.rocketry.motorsim.ChangeListening.Subject;
  15 import com.billkuker.rocketry.motorsim.grain.CoredCylindricalGrain;
  16
  17 public aspect QuantityChecking {
  18
  19         public interface Checked {
  20         };
  21
  22         declare parents: Motor || Grain || Chamber || Nozzle || Fuel extends Checked;
  23
  24         void around(Checked c, Amount amt):
  25                 execution(void Checked+.set*(Amount)) && target(c) && args(amt) {
  26                 System.out.println(thisJoinPointStaticPart.getSignature().getName()
  27                                 + " set to " + amt);
  28                 try {
  29                         BeanInfo b = Introspector.getBeanInfo(c.getClass());
  30                         PropertyDescriptor ps[] = b.getPropertyDescriptors();
  31                         String name = thisJoinPointStaticPart.getSignature().getName();
  32                         name = name.replaceFirst("set", "");
  33                         for (int i = 0; i < ps.length; i++) {
  34                                 if (ps[i].getName().equals(name)) {
  35                                         Type t = ps[i].getReadMethod().getGenericReturnType();
  36                                         ParameterizedType p = (ParameterizedType) t;
  37                                         Class expected = (Class) p.getActualTypeArguments()[0];
  38                                         Field f = expected.getDeclaredField("UNIT");
  39                                         Unit u = (Unit) f.get(null);
  40
  41                                         Amount a = amt;
  42                                         if (!a.getUnit().isCompatible(u)) {
  43                                                 System.err.println("Aspect Expected " + expected
  44                                                                 + " got " + u);
  45
  46                                                 throw new Error(ps[i].getShortDescription()
  47                                                                 + " must be in units of "
  48                                                                 + expected.getSimpleName());
  49                                         }
  50                                 }
  51                         }
  52                 } catch (Exception e) {
  53                         e.printStackTrace();
  54                 }
  55                 proceed(c, amt);
  56         }
  57 }