teichmann@5829: package org.dive4elements.river.importer;
sascha@501: 
sascha@501: import java.math.BigDecimal;
sascha@501: 
sascha@503: import java.util.Comparator;
sascha@503: 
sascha@501: public class ValueKey
sascha@501: {
sascha@503:     public static final double EPSILON = 1e-6;
sascha@503: 
sascha@503:     public static final Comparator<ValueKey> EPSILON_COMPARATOR =
sascha@771:         new Comparator<ValueKey>()
sascha@503:     {
sascha@503:         public int compare(ValueKey x, ValueKey y) {
sascha@503:             int cmp = ValueKey.compare(x.a, y.a);
sascha@503:             if (cmp != 0) return cmp;
sascha@503:             return ValueKey.compare(x.b, y.b);
sascha@503:         }
sascha@503:     };
sascha@503: 
sascha@503:     public static int compare(BigDecimal a, BigDecimal b) {
sascha@503:         if (a == null && b == null) return  0;
sascha@503:         if (a != null && b == null) return +1;
sascha@503:         if (a == null && b != null) return -1;
sascha@503: 
sascha@503:         double diff = a.doubleValue() - b.doubleValue();
sascha@503:         if (diff < -EPSILON) return -1;
sascha@503:         return diff > EPSILON ? +1 : 0;
sascha@503:     }
sascha@503: 
sascha@501:     protected BigDecimal a;
sascha@501:     protected BigDecimal b;
sascha@501: 
sascha@501:     public ValueKey() {
sascha@501:     }
sascha@501: 
sascha@501:     public ValueKey(BigDecimal a, BigDecimal b) {
sascha@501:         this.a = a;
sascha@501:         this.b = b;
sascha@501:     }
sascha@501: 
sascha@501:     @Override
sascha@501:     public int hashCode() {
sascha@501:         return ((a != null ? a.hashCode() : 0) << 16)
sascha@501:               | (b != null ? b.hashCode() : 0);
sascha@501:     }
sascha@501: 
sascha@501:     @Override
sascha@501:     public boolean equals(Object other) {
sascha@501:         if (!(other instanceof ValueKey)) {
sascha@501:             return false;
sascha@501:         }
sascha@501:         ValueKey o = (ValueKey)other;
sascha@501:         return !(
sascha@771:                (a == null && o.a != null)
sascha@771:             || (a != null && o.a == null)
sascha@771:             || (a != null && !a.equals(o.a))
sascha@771:             || (b == null && o.b != null)
sascha@501:             || (b != null && o.b == null)
sascha@501:             || (b != null && !b.equals(o.b)));
sascha@501:     }
sascha@501: }
sascha@501: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :