/** Method to dump debugging information */
  private void dumpAll(Map map, int lvmid) {
    if (DEBUG) {
      Set keys = map.keySet();

      System.err.println("Dump for " + lvmid);
      int j = 0;
      for (Iterator i = keys.iterator(); i.hasNext(); j++) {
        Monitor monitor = (Monitor) map.get(i.next());
        System.err.println(j + "\t" + monitor.getName() + "=" + monitor.getValue());
      }
      System.err.println("nextEntry = " + nextEntry + " pollForEntry = " + pollForEntry);
      System.err.println("Buffer info:");
      System.err.println("buffer = " + buffer);
    }
  }
Beispiel #2
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  /*
   * evaluate the given expression.
   */
  public Object evaluate(Expression e) {
    if (e == null) {
      return null;
    }

    if (debug) {
      System.out.println("Evaluating expression: " + e);
    }

    if (e instanceof Literal) {
      return ((Literal) e).getValue();
    }

    if (e instanceof Identifier) {
      Identifier id = (Identifier) e;
      if (map.containsKey(id.getName())) {
        return map.get(id.getName());
      } else {
        // cache the data values for coherency of the values over
        // the life of this expression executer.
        Monitor m = (Monitor) id.getValue();
        Object v = m.getValue();
        map.put(id.getName(), v);
        return v;
      }
    }

    Expression l = e.getLeft();
    Expression r = e.getRight();

    Operator op = e.getOperator();

    if (op == null) {
      return evaluate(l);
    } else {
      Double lval = new Double(((Number) evaluate(l)).doubleValue());
      Double rval = new Double(((Number) evaluate(r)).doubleValue());
      double result = op.eval(lval.doubleValue(), rval.doubleValue());
      if (debug) {
        System.out.println("Performed Operation: " + lval + op + rval + " = " + result);
      }
      return new Double(result);
    }
  }