dddsample-core中Specification有什么用
本篇文章給大家分享的是有關dddsample-core中Specification有什么用，小編覺得挺實用的，因此分享給大家學習，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。
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Specification
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接口定義了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 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聲明實現Specification，它實現了and、or、not方法
AndSpecification
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繼承了AbstractSpecification，它定義了spec1、spec2屬性，其isSatisfiedBy返回的是spec1.isSatisfiedBy(t) && spec2.isSatisfiedBy(t)
OrSpecification
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繼承了AbstractSpecification，它定義了spec1、spec2屬性，其isSatisfiedBy返回的是spec1.isSatisfiedBy(t) || spec2.isSatisfiedBy(t)
NotSpecification
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繼承了AbstractSpecification，它定義了spec1屬性，其isSatisfiedBy返回的是!spec1.isSatisfiedBy(t)
小結
dddsample-core的Specification接口定義了isSatisfiedBy、and、or、not方法；AndSpecification、OrSpecification、NotSpecification繼承了AbstractSpecification，實現了Specification接口。
以上就是dddsample-core中Specification有什么用，小編相信有部分知識點可能是我們日常工作會見到或用到的。希望你能通過這篇文章學到更多知識。更多詳情敬請關注創新互聯行業資訊頻道。
名稱欄目：dddsample-core中Specification有什么用
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