cdm/src/main/java/ucar/nc2/Attribute.java
static public Map<String, Attribute> makeMap(List<Attribute> atts)
  {
    int size = (atts == null) ? 1 : atts.size();
    Map<String, Attribute> result = new HashMap<>(size);
    if(atts == null) return result;
    for(Attribute att : atts) result.put(att.getShortName(), att);
    return result;
  }
static public Map<String, Attribute> makeMap(List<Attribute> atts)
  {
    int size = (atts == null) ? 1 : atts.size();
    Map<String, Attribute> result = new HashMap<>(size);
    if(atts == null) return result;
    for(Attribute att : atts) result.put(att.getShortName(), att);
    return result;
  }
Turn a list into a map

@param atts list of attributes
@return map of attributes by name