code: public DescribeRulesRequest withRuleArns(String... ruleArns) {
          if (this.ruleArns == null) {
              setRuleArns(new java.util.ArrayList<String>(ruleArns.length));
          }
          for (String ele : ruleArns) {
              this.ruleArns.add(ele);
          }
          return this;
      }
docs: <p>
  The Amazon Resource Names (ARN) of the rules.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setRuleArns(java.util.Collection)} or {@link #withRuleArns(java.util.Collection)} if you want to override
  the existing values.
  </p>
  
  @param ruleArns
  The Amazon Resource Names (ARN) of the rules.
  @return Returns a reference to this object so that method calls can be chained together.