责任链中：但个中的处理

责任链中：但个中的处理

public class CheckQueryParams {

    private static interface Validation{
 void check(QueryInfo query);
    }
   
    private static List<Validation> validations = new ArrayList<Validation>();
   
    static {
 validations.add(new Validation() {
     public void check(QueryInfo query) {
  if(StringUtils.isEmpty(query.getStartKey()) && StringUtils.isEmpty(query.getEndKey()))
      throw new RuntimeException("Both keys can not be null or empty at the same time");
     }});
    }

    public static void check(QueryInfo query) {
 for(Validation validation : validations) {
     validation.check(query);
 }
    }
}