code: public Authorizer withProviderARNs(String... providerARNs) {
          if (this.providerARNs == null) {
              setProviderARNs(new java.util.ArrayList<String>(providerARNs.length));
          }
          for (String ele : providerARNs) {
              this.providerARNs.add(ele);
          }
          return this;
      }
docs: <p>
  A list of the Amazon Cognito user pool ARNs for the <code>COGNITO_USER_POOLS</code> authorizer. Each element is
  of this format: <code>arn:aws:cognito-idp:{region}:{account_id}:userpool/{user_pool_id}</code>. For a
  <code>TOKEN</code> or <code>REQUEST</code> authorizer, this is not defined.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setProviderARNs(java.util.Collection)} or {@link #withProviderARNs(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param providerARNs
  A list of the Amazon Cognito user pool ARNs for the <code>COGNITO_USER_POOLS</code> authorizer. Each
  element is of this format: <code>arn:aws:cognito-idp:{region}:{account_id}:userpool/{user_pool_id}</code>.
  For a <code>TOKEN</code> or <code>REQUEST</code> authorizer, this is not defined.
  @return Returns a reference to this object so that method calls can be chained together.