设计模式之责任链

public abstract class AbsXXXValidator {/*** 下一个节点*/protected AbsXXXValidator nextValidator;/*** set next.*/public void setNextValidator(AbsXXXValidator absValidator) {this.nextValidator = absValidator;}/*** isValidatePass.** @return true: pass*/public abstract Result isValidatePass();/*** 执行下一个校验.** @return 下一个校验是否通过*/public Result nextValidator() {if (nextValidator == null) {return succeedResult();}return nextValidator.isValidatePass();}
}

public class XXXValidatorChainBuilder {private AbsXXXValidator firstValidator;private AbsXXXValidator lastValidator;/*** setValidator.** @param absValidator {@link AbsXXXValidator}* @return 返会builder.*/public XXXValidatorChainBuilder setValidator(AbsXXXValidator absValidator) {// 插入头结点if (firstValidator == null) {firstValidator = absValidator;lastValidator = absValidator;return this;}// 建立链表lastValidator.setNextValidator(absValidator);lastValidator = absValidator;return this;}/*** 获取链表的头结点** @return {@link AbsXXXValidator}*/public AbsXXXValidator build() {return firstValidator;}
}