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创建对应类型的 Predicates 的正确方式。

feature/net-util
ZhouXY108 2023-04-30 08:56:27 +08:00
parent ad01c58633
commit 9b268b668e
2 changed files with 10 additions and 9 deletions
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8
src/main/java/xyz/zhouxy/plusone/commons/function/Predicates.java
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@ -2,9 +2,13 @@ package xyz.zhouxy.plusone.commons.function;
import java.util.function.Predicate; import java.util.function.Predicate;
public class Predicates<T> { public class Predicates {
public final Predicate<T> of(Predicate<? super T> predicate) { public static <T> Predicate<T> of(Predicate<? super T> predicate) {
return predicate::test; return predicate::test;
} }
private Predicates() {
throw new IllegalStateException("Utility class");
}
} }

11
src/test/java/xyz/zhouxy/plusone/commons/function/FunctionTests.java
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@ -1,5 +1,6 @@
package xyz.zhouxy.plusone.commons.function; package xyz.zhouxy.plusone.commons.function;
import java.util.Objects;
import java.util.function.Predicate; import java.util.function.Predicate;
import org.apache.commons.lang3.StringUtils; import org.apache.commons.lang3.StringUtils;
@ -11,12 +12,8 @@ class FunctionTests {
@Test @Test
void test() { void test() {
String str = ""; String str = "";
Predicate<String> predicate = new Predicates<String>().of(this::nonNull) Predicate<String> predicate = Predicates.<String>of(Objects::nonNull)
.or(StringUtils::isNotBlank); .and(StringUtils::isNotEmpty);
Assert.isTrue(predicate.test(str), "未通过"); Assert.isFalse(predicate.test(str), "校验应是不通过");
}
boolean nonNull(Object obj) {
return obj != null;
} }
} }