code: public void setRules(java.util.Collection<DataRetrievalRule> rules) {
          if (rules == null) {
              this.rules = null;
              return;
          }
  
          this.rules = new java.util.ArrayList<DataRetrievalRule>(rules);
      }
docs: <p>
  The policy rule. Although this is a list type, currently there must be only one rule, which contains a Strategy
  field and optionally a BytesPerHour field.
  </p>
  
  @param rules
  The policy rule. Although this is a list type, currently there must be only one rule, which contains a
  Strategy field and optionally a BytesPerHour field.