您好,登录后才能下订单哦!
本篇文章给大家分享的是有关dddsample-core中Specification有什么用,小编觉得挺实用的,因此分享给大家学习,希望大家阅读完这篇文章后可以有所收获,话不多说,跟着小编一起来看看吧。
public interface Specification<T> { /** * Check if {@code t} is satisfied by the specification. * * @param t Object to test. * @return {@code true} if {@code t} satisfies the specification. */ boolean isSatisfiedBy(T t); /** * Create a new specification that is the AND operation of {@code this} specification and another specification. * @param specification Specification to AND. * @return A new specification. */ Specification<T> and(Specification<T> specification); /** * Create a new specification that is the OR operation of {@code this} specification and another specification. * @param specification Specification to OR. * @return A new specification. */ Specification<T> or(Specification<T> specification); /** * Create a new specification that is the NOT operation of {@code this} specification. * @param specification Specification to NOT. * @return A new specification. */ Specification<T> not(Specification<T> specification); }
Specification接口定义了isSatisfiedBy、and、or、not方法
/** * Abstract base implementation of composite {@link Specification} with default * implementations for {@code and}, {@code or} and {@code not}. */ public abstract class AbstractSpecification<T> implements Specification<T> { /** * {@inheritDoc} */ public abstract boolean isSatisfiedBy(T t); /** * {@inheritDoc} */ public Specification<T> and(final Specification<T> specification) { return new AndSpecification<T>(this, specification); } /** * {@inheritDoc} */ public Specification<T> or(final Specification<T> specification) { return new OrSpecification<T>(this, specification); } /** * {@inheritDoc} */ public Specification<T> not(final Specification<T> specification) { return new NotSpecification<T>(specification); } }
AbstractSpecification声明实现Specification,它实现了and、or、not方法
public class AndSpecification<T> extends AbstractSpecification<T> { private Specification<T> spec1; private Specification<T> spec2; /** * Create a new AND specification based on two other spec. * * @param spec1 Specification one. * @param spec2 Specification two. */ public AndSpecification(final Specification<T> spec1, final Specification<T> spec2) { this.spec1 = spec1; this.spec2 = spec2; } /** * {@inheritDoc} */ public boolean isSatisfiedBy(final T t) { return spec1.isSatisfiedBy(t) && spec2.isSatisfiedBy(t); } }
AndSpecification继承了AbstractSpecification,它定义了spec1、spec2属性,其isSatisfiedBy返回的是spec1.isSatisfiedBy(t) && spec2.isSatisfiedBy(t)
public class OrSpecification<T> extends AbstractSpecification<T> { private Specification<T> spec1; private Specification<T> spec2; /** * Create a new OR specification based on two other spec. * * @param spec1 Specification one. * @param spec2 Specification two. */ public OrSpecification(final Specification<T> spec1, final Specification<T> spec2) { this.spec1 = spec1; this.spec2 = spec2; } /** * {@inheritDoc} */ public boolean isSatisfiedBy(final T t) { return spec1.isSatisfiedBy(t) || spec2.isSatisfiedBy(t); } }
OrSpecification继承了AbstractSpecification,它定义了spec1、spec2属性,其isSatisfiedBy返回的是spec1.isSatisfiedBy(t) || spec2.isSatisfiedBy(t)
public class NotSpecification<T> extends AbstractSpecification<T> { private Specification<T> spec1; /** * Create a new NOT specification based on another spec. * * @param spec1 Specification instance to not. */ public NotSpecification(final Specification<T> spec1) { this.spec1 = spec1; } /** * {@inheritDoc} */ public boolean isSatisfiedBy(final T t) { return !spec1.isSatisfiedBy(t); } }
NotSpecification继承了AbstractSpecification,它定义了spec1属性,其isSatisfiedBy返回的是!spec1.isSatisfiedBy(t)
dddsample-core的Specification接口定义了isSatisfiedBy、and、or、not方法;AndSpecification、OrSpecification、NotSpecification继承了AbstractSpecification,实现了Specification接口。
以上就是dddsample-core中Specification有什么用,小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注亿速云行业资讯频道。
免责声明:本站发布的内容(图片、视频和文字)以原创、转载和分享为主,文章观点不代表本网站立场,如果涉及侵权请联系站长邮箱:is@yisu.com进行举报,并提供相关证据,一经查实,将立刻删除涉嫌侵权内容。