code: public void setVpcSecurityGroupIds(java.util.Collection<String> vpcSecurityGroupIds) {
          if (vpcSecurityGroupIds == null) {
              this.vpcSecurityGroupIds = null;
              return;
          }
  
          this.vpcSecurityGroupIds = new java.util.ArrayList<String>(vpcSecurityGroupIds);
      }
docs: <p>
  A list of EC2 VPC security groups to associate with this DB cluster.
  </p>
  
  @param vpcSecurityGroupIds
  A list of EC2 VPC security groups to associate with this DB cluster.