bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/variable/VariableNode.java

   1 package org.simantics.db.layer0.variable;
   2
   3 public class VariableNode<Node> {
   4     public final NodeSupport<Node> support;
   5     public final Object node;
   6     private int hash;
   7     public VariableNode(NodeSupport<Node> support, Object node) {
   8         assert(support != null);
   9         this.support = support;
  10         this.node = node;
  11     }
  12
  13     private int computeHash() {
  14         return 31*support.hashCode() + 41*node.hashCode();
  15     }
  16
  17     @Override
  18     public int hashCode() {
  19         if (hash == 0)
  20             hash = computeHash();
  21         return hash;
  22     }
  23
  24     @Override
  25     public boolean equals(Object object) {
  26         if (this == object)
  27             return true;
  28         else if (object == null)
  29             return false;
  30         else if (!(object instanceof VariableNode))
  31             return false;
  32         VariableNode<?> r = (VariableNode<?>)object;
  33         if (r.hashCode() != hashCode())
  34             return false;
  35         return r.support.equals(support) && r.node.equals(node);
  36     }
  37
  38 }