我在许多变体中看到的一种非常常见的方法是编写自己的功能接口,该功能接口将引发抛出已检查的异常(1),并使该解决方案适应内置接口(2).
/**
* An EPredicate is a Predicate that allows a checked exception to be thrown.
*
* @param the type of the input to the predicate
* @param the allowed exception
*/
@FunctionalInterface
public interface EPredicate {
/**
* (1) the method permits a checked exception
*/
boolean test(T t) throws E;
/**
* (2) the method adapts an EPredicate to a Predicate.
*/
static Predicate unwrap(EPredicate predicate) {
return t -> {
try {
return predicate.test(t);
} catch (Exception e) {
return false;
}
};
}
}
一个例子看起来很优雅：
.stream()
.filter(EPredicate.unwrap(item -> validator.[...].isOwner()))
哪里,
> ItemType是项目的类型；
>异常是EspaiDocFault和DataAccessException的共同父代.
.stream()
.filter(EPredicate.unwrap(item -> validator.[...].isOwner()))
