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Opt修改
* ofBlankAble入参和泛型改为String * ofEmptyAble额外判断集合内元素全部为null的情况 * peek直接调用ifPresent * peeks改为可爱的写法 - 移除名字太长的ifPresentOrElse - 移除没有必要的orElseThrow(Function,String) + 新增orElseRun,对应一些不满足条件时调用的简单而又无返回值操作
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@ -26,13 +26,13 @@ package cn.hutool.core.lang;
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import cn.hutool.core.collection.CollUtil;
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import cn.hutool.core.lang.func.Func0;
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import cn.hutool.core.lang.func.VoidFunc0;
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import cn.hutool.core.text.StrUtil;
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import java.util.Collection;
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import java.util.NoSuchElementException;
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import java.util.Objects;
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import java.util.Optional;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.NoSuchElementException;
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import java.util.function.Consumer;
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import java.util.function.Function;
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import java.util.function.Predicate;
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@ -92,11 +92,10 @@ public class Opt<T> {
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* 返回一个包裹里元素可能为空的{@code Opt},额外判断了空字符串的情况
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*
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* @param value 传入需要包裹的元素
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* @param <T> 包裹里元素的类型
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* @return 一个包裹里元素可能为空,或者为空字符串的 {@code Opt}
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*/
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public static <T> Opt<T> ofBlankAble(final T value) {
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return StrUtil.isBlankIfStr(value) ? empty() : new Opt<>(value);
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public static Opt<String> ofBlankAble(final String value) {
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return StrUtil.isBlank(value) ? empty() : new Opt<>(value);
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}
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/**
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@ -109,7 +108,7 @@ public class Opt<T> {
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* @since 5.7.17
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*/
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public static <T, R extends Collection<T>> Opt<R> ofEmptyAble(final R value) {
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return CollUtil.isEmpty(value) ? empty() : new Opt<>(value);
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return CollUtil.isEmpty(value) || Collections.frequency(value, null) == value.size() ? empty() : new Opt<>(value);
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}
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/**
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@ -217,56 +216,6 @@ public class Opt<T> {
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return this;
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}
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/**
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* 如果包裹里的值存在,就执行传入的值存在时的操作({@link Consumer#accept})
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* 否则执行传入的值不存在时的操作({@link VoidFunc0}中的{@link VoidFunc0#call()})
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*
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* <p>
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* 例如值存在就打印对应的值,不存在则用{@code Console.error}打印另一句字符串
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* <pre>{@code
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* Opt.ofNullable("Hello Hutool!").ifPresentOrElse(Console::log, () -> Console.error("Ops!Something is wrong!"));
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* }</pre>
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*
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* @param action 包裹里的值存在时的操作
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* @param emptyAction 包裹里的值不存在时的操作
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* @return this;
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* @throws NullPointerException 如果包裹里的值存在时,执行的操作为 {@code null}, 或者包裹里的值不存在时的操作为 {@code null},则抛出{@code NPE}
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*/
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public Opt<T> ifPresentOrElse(final Consumer<? super T> action, final VoidFunc0 emptyAction) {
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if (isPresent()) {
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action.accept(value);
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} else {
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emptyAction.callWithRuntimeException();
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}
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return this;
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}
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/**
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* 如果包裹里的值存在,就执行传入的值存在时的操作({@link Function#apply(Object)})支持链式调用、转换为其他类型
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* 否则执行传入的值不存在时的操作({@link VoidFunc0}中的{@link VoidFunc0#call()})
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*
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* <p>
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* 如果值存在就转换为大写,否则用{@code Console.error}打印另一句字符串
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* <pre>{@code
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* String hutool = Opt.ofBlankAble("hutool").mapOrElse(String::toUpperCase, () -> Console.log("yes")).mapOrElse(String::intern, () -> Console.log("Value is not present~")).get();
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* }</pre>
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*
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* @param <U> map后新的类型
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* @param mapper 包裹里的值存在时的操作
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* @param emptyAction 包裹里的值不存在时的操作
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* @return 新的类型的Opt
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* @throws NullPointerException 如果包裹里的值存在时,执行的操作为 {@code null}, 或者包裹里的值不存在时的操作为 {@code null},则抛出{@code NPE}
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*/
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public <U> Opt<U> mapOrElse(final Function<? super T, ? extends U> mapper, final VoidFunc0 emptyAction) {
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if (isPresent()) {
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return ofNullable(mapper.apply(value));
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} else {
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emptyAction.callWithRuntimeException();
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return empty();
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}
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}
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/**
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* 判断包裹里的值存在并且与给定的条件是否满足 ({@link Predicate#test}执行结果是否为true)
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* 如果满足条件则返回本身
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@ -359,12 +308,7 @@ public class Opt<T> {
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* @author VampireAchao
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*/
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public Opt<T> peek(final Consumer<T> action) throws NullPointerException {
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Objects.requireNonNull(action);
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if (isEmpty()) {
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return Opt.empty();
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}
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action.accept(value);
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return this;
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return ifPresent(action);
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}
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@ -382,8 +326,7 @@ public class Opt<T> {
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*/
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@SafeVarargs
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public final Opt<T> peeks(final Consumer<T>... actions) throws NullPointerException {
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// 第三个参数 (opts, opt) -> null其实并不会执行到该函数式接口所以直接返回了个null
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return Stream.of(actions).reduce(this, Opt<T>::peek, (opts, opt) -> null);
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return peek(Stream.of(actions).reduce(Consumer::andThen).orElseGet(() -> o -> {}));
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}
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/**
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@ -455,6 +398,22 @@ public class Opt<T> {
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return isPresent() ? value : supplier.get();
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}
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/**
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* 如果包裹里元素的值存在,则返回该值,否则执行传入的操作
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*
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* @param action 值不存在时执行的操作
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* @return 如果包裹里元素的值存在,则返回该值,否则执行传入的操作
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* @throws NullPointerException 如果值不存在,并且传入的操作为 {@code null}
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*/
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public T orElseRun(Runnable action) {
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if (isPresent()) {
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return value;
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} else {
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action.run();
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return null;
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}
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}
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/**
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* 如果包裹里的值存在,则返回该值,否则抛出 {@code NoSuchElementException}
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*
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@ -462,7 +421,7 @@ public class Opt<T> {
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* @throws NoSuchElementException 如果包裹里的值不存在则抛出该异常
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*/
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public T orElseThrow() {
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return orElseThrow(NoSuchElementException::new, "No value present");
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return orElseThrow(() -> new NoSuchElementException("No value present"));
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}
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/**
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@ -483,30 +442,6 @@ public class Opt<T> {
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}
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}
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/**
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* 如果包裹里的值存在,则返回该值,否则执行传入的操作,获取异常类型的返回值并抛出
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*
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* <p>往往是一个包含 自定义消息 构造器的异常 例如
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* <pre>{@code
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* Opt.ofNullable(null).orElseThrow(IllegalStateException::new, "Ops!Something is wrong!");
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* }</pre>
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*
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* @param <X> 异常类型
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* @param exceptionFunction 值不存在时执行的操作,返回值继承 {@link Throwable}
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* @param message 作为传入操作执行时的参数,一般作为异常自定义提示语
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* @return 包裹里不能为空的值
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* @throws X 如果值不存在
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* @throws NullPointerException 如果值不存在并且 传入的操作为 {@code null}或者操作执行后的返回值为{@code null}
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* @author VampireAchao
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*/
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public <X extends Throwable> T orElseThrow(final Function<String, ? extends X> exceptionFunction, final String message) throws X {
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if (isPresent()) {
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return value;
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} else {
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throw exceptionFunction.apply(message);
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}
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}
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/**
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* 转换为 {@link Optional}对象
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*
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@ -9,6 +9,9 @@ import org.junit.Assert;
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import org.junit.Ignore;
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import org.junit.Test;
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import java.util.Map;
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import java.util.HashMap;
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import java.util.Arrays;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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@ -45,19 +48,6 @@ public class OptTest {
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Assert.assertTrue(isEmpty);
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}
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@Test
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@Ignore
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public void ifPresentOrElseTest() {
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// 存在就打印对应的值,不存在则用{@code System.err.println}打印另一句字符串
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Opt.ofNullable("Hello Hutool!").ifPresentOrElse(Console::log, () -> Console.error("Ops!Something is wrong!"));
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Opt.empty().ifPresentOrElse(Console::log, () -> Console.error("Ops!Something is wrong!"));
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// 拓展为支持链式调用
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Opt.empty().ifPresentOrElse(Console::log, () -> Console.error("Ops!Something is wrong!"))
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.ifPresentOrElse(Console::log, () -> Console.error("Ops!Something is wrong!"));
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}
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@Test
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public void peekTest() {
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final User user = new User();
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@ -127,11 +117,16 @@ public class OptTest {
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Assert.assertNull(assignException);
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}
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@Test(expected = IllegalStateException.class)
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public void orElseThrowTest3() {
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// 获取一个不可能为空的值,否则抛出带自定义消息的自定义异常
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final Object exceptionWithMessage = Opt.empty().orElseThrow(IllegalStateException::new, "Ops!Something is wrong!");
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Assert.assertNull(exceptionWithMessage);
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@Test
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public void orElseRunTest() {
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// 判断一个值是否为空,为空执行一段逻辑,否则执行另一段逻辑
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Map<String, Integer> map = new HashMap<>();
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final String key = "key";
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map.put(key, 1);
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Opt.ofNullable(map.get(key))
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.ifPresent(v -> map.put(key, v + 1))
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.orElseRun(() -> map.remove(key));
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Assert.assertEquals((Object) 2, map.get(key));
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}
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@Test
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@ -155,14 +150,8 @@ public class OptTest {
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// 现在,一个ofEmptyAble搞定
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final List<String> hutool = Opt.ofEmptyAble(Collections.<String>emptyList()).orElseGet(() -> Collections.singletonList("hutool"));
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Assert.assertEquals(past, hutool);
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Assert.assertEquals(hutool, Collections.singletonList("hutool"));
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}
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@Test
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public void mapOrElseTest() {
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// 如果值存在就转换为大写,否则打印一句字符串,支持链式调用、转换为其他类型
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final String hutool = Opt.ofBlankAble("hutool").mapOrElse(String::toUpperCase, () -> Console.log("yes")).mapOrElse(String::intern, () -> Console.log("Value is not present~")).get();
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Assert.assertEquals("HUTOOL", hutool);
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Assert.assertEquals(Collections.singletonList("hutool"), hutool);
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Assert.assertTrue(Opt.ofEmptyAble(Arrays.asList(null, null, null)).isEmpty());
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}
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@SuppressWarnings({"MismatchedQueryAndUpdateOfCollection", "ConstantConditions"})
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