git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/simulation/MassData.java

   1 package net.sf.openrocket.simulation;
   2
   3 import net.sf.openrocket.util.Coordinate;
   4 import net.sf.openrocket.util.MathUtil;
   5
   6 /**
   7  * An immutable value object containing the mass data of a rocket.
   8  *
   9  * @author Sampo Niskanen <sampo.niskanen@iki.fi>
  10  */
  11 public class MassData {
  12
  13         private final Coordinate cg;
  14         private final double longitudinalInertia;
  15         private final double rotationalInertia;
  16
  17
  18         public MassData(Coordinate cg, double longitudinalInertia, double rotationalInertia) {
  19                 if (cg == null) {
  20                         throw new IllegalArgumentException("cg is null");
  21                 }
  22                 this.cg = cg;
  23                 this.longitudinalInertia = longitudinalInertia;
  24                 this.rotationalInertia = rotationalInertia;
  25         }
  26
  27
  28
  29
  30         public Coordinate getCG() {
  31                 return cg;
  32         }
  33
  34         public double getLongitudinalInertia() {
  35                 return longitudinalInertia;
  36         }
  37
  38         public double getRotationalInertia() {
  39                 return rotationalInertia;
  40         }
  41
  42
  43
  44         @Override
  45         public boolean equals(Object obj) {
  46                 if (this == obj)
  47                         return true;
  48                 if (!(obj instanceof MassData))
  49                         return false;
  50
  51                 MassData other = (MassData) obj;
  52                 return (this.cg.equals(other.cg) && MathUtil.equals(this.longitudinalInertia, other.longitudinalInertia) &&
  53                                 MathUtil.equals(this.rotationalInertia, other.rotationalInertia));
  54         }
  55
  56
  57         @Override
  58         public int hashCode() {
  59                 return (int) (cg.hashCode() ^ Double.doubleToLongBits(longitudinalInertia) ^ Double.doubleToLongBits(rotationalInertia));
  60         }
  61
  62
  63         @Override
  64         public String toString() {
  65                 return "MassData [cg=" + cg + ", longitudinalInertia=" + longitudinalInertia
  66                                 + ", rotationalInertia=" + rotationalInertia + "]";
  67         }
  68
  69 }