dddsample-core中Specification有什么用
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Specification
public interface Specification{ /** * 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 and(Specification 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 or(Specification specification); /** * Create a new specification that is the NOT operation of {@code this} specification. * @param specification Specification to NOT. * @return A new specification. */ Specification not(Specification specification); }
Specification接口定义了isSatisfiedBy、and、or、not方法
AbstractSpecification
/** * Abstract base implementation of composite {@link Specification} with default * implementations for {@code and}, {@code or} and {@code not}. */ public abstract class AbstractSpecificationimplements Specification { /** * {@inheritDoc} */ public abstract boolean isSatisfiedBy(T t); /** * {@inheritDoc} */ public Specification and(final Specification specification) { return new AndSpecification (this, specification); } /** * {@inheritDoc} */ public Specification or(final Specification specification) { return new OrSpecification (this, specification); } /** * {@inheritDoc} */ public Specification not(final Specification specification) { return new NotSpecification (specification); } }
AbstractSpecification声明实现Specification,它实现了and、or、not方法
AndSpecification
public class AndSpecificationextends AbstractSpecification { private Specification spec1; private Specification spec2; /** * Create a new AND specification based on two other spec. * * @param spec1 Specification one. * @param spec2 Specification two. */ public AndSpecification(final Specification spec1, final Specification 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)
OrSpecification
public class OrSpecificationextends AbstractSpecification { private Specification spec1; private Specification spec2; /** * Create a new OR specification based on two other spec. * * @param spec1 Specification one. * @param spec2 Specification two. */ public OrSpecification(final Specification spec1, final Specification 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)
NotSpecification
public class NotSpecificationextends AbstractSpecification { private Specification spec1; /** * Create a new NOT specification based on another spec. * * @param spec1 Specification instance to not. */ public NotSpecification(final Specification 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)
小结
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。更多详情敬请关注创新互联行业资讯频道。
本文名称:dddsample-core中Specification有什么用
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