code: @Override
      public DecisionType combine(DecisionType op1, DecisionType op2) {
          if (op1 == DecisionType.Deny || op2 == DecisionType.Deny) {
              return DecisionType.Deny;
          } else {
              return DecisionType.Permit;
          }
      }
docs: /* (non-Javadoc)
  @see nl.uva.sne.midd.algorithms.CombiningAlgorithm#combine(nl.uva.sne.midd.DecisionType, nl.uva.sne.midd.DecisionType)