git.gag.com Git - debian/openrocket/blob - core/src/net/sf/openrocket/util/NumericComparator.java

   1 package net.sf.openrocket.util;
   2
   3 import java.util.Comparator;
   4
   5 public class NumericComparator implements Comparator<Object> {
   6
   7         public static final NumericComparator INSTANCE = new NumericComparator();
   8
   9         @Override
  10         public int compare(Object o1, Object o2) {
  11                 double v1 = getValue(o1);
  12                 double v2 = getValue(o2);
  13
  14                 if (Double.isNaN(v1) || Double.isNaN(v2)) {
  15                         String s1 = o1.toString();
  16                         String s2 = o2.toString();
  17                         return s1.compareTo(s2);
  18                 }
  19
  20                 return Double.compare(v1, v2);
  21         }
  22
  23         private double getValue(Object o) {
  24                 if (o instanceof Number) {
  25                         return ((Number) o).doubleValue();
  26                 }
  27                 String s = o.toString();
  28                 try {
  29                         return Double.parseDouble(s);
  30                 } catch (NumberFormatException e) {
  31                         return Double.NaN;
  32                 }
  33         }
  34
  35 }