/**
   * Get the coordinate index for the record
   *
   * @param record record in question
   * @return index or -1 if not found
   */
  private int coordIndex(GridRecord record) {
    double val = record.getLevel1();
    double val2 = record.getLevel2();
    if (usesBounds && (val > val2)) {
      val = record.getLevel2();
      val2 = record.getLevel1();
    }

    for (int i = 0; i < levels.size(); i++) {
      LevelCoord lc = (LevelCoord) levels.get(i);
      if (usesBounds) {
        if (ucar.nc2.util.Misc.closeEnough(lc.value1, val)
            && ucar.nc2.util.Misc.closeEnough(lc.value2, val2)) {
          return i;
        }
      } else {
        if (ucar.nc2.util.Misc.closeEnough(lc.value1, val)) {
          return i;
        }
      }
    }
    return -1;
  }
  /**
   * Match levels
   *
   * @param records records to match
   * @return true if they have the same levels
   */
  boolean matchLevels(List<GridRecord> records) {

    // first create a new list
    List<LevelCoord> levelList = new ArrayList<LevelCoord>(records.size());
    for (GridRecord record : records) {
      LevelCoord lc = new LevelCoord(record.getLevel1(), record.getLevel2());
      if (!levelList.contains(lc)) {
        levelList.add(lc);
      }
    }

    Collections.sort(levelList);
    if (positive.equals("down")) {
      Collections.reverse(levelList);
    }

    // gotta equal existing list
    return levelList.equals(levels);
  }
  /**
   * Add levels
   *
   * @param records GridRecords, one for each level
   */
  void addLevels(List<GridRecord> records) {
    for (int i = 0; i < records.size(); i++) {
      GridRecord record = records.get(i);

      if (coordIndex(record) < 0) {
        levels.add(new LevelCoord(record.getLevel1(), record.getLevel2()));
        if (dontUseVertical && (levels.size() > 1)) {
          if (GridServiceProvider.debugVert) {
            logger.warn(
                "GribCoordSys: unused level coordinate has > 1 levels = "
                    + levelName
                    + " "
                    + record.getLevelType1()
                    + " "
                    + levels.size());
          }
        }
      }
    }
    Collections.sort(levels);
    if (positive.equals("down")) {
      Collections.reverse(levels);
    }
  }