mirror of
https://gitee.com/dromara/hutool.git
synced 2025-04-05 17:37:59 +08:00
add methods
This commit is contained in:
parent
42fbf36042
commit
9818263d30
@ -25,6 +25,7 @@
|
||||
package cn.hutool.core.lang;
|
||||
|
||||
import cn.hutool.core.collection.CollectionUtil;
|
||||
import cn.hutool.core.lang.func.Func0;
|
||||
import cn.hutool.core.lang.func.VoidFunc0;
|
||||
import cn.hutool.core.util.StrUtil;
|
||||
|
||||
@ -105,23 +106,25 @@ public class Opt<T> {
|
||||
* @param value 传入需要包裹的元素
|
||||
* @param <T> 包裹里元素的类型
|
||||
* @return 一个包裹里元素可能为空的 {@code Opt}
|
||||
* @since 5.7.17
|
||||
*/
|
||||
public static <T> Opt<List<T>> ofEmptyAble(List<T> value) {
|
||||
return CollectionUtil.isEmpty(value) ? empty() : new Opt<>(value);
|
||||
}
|
||||
|
||||
/**
|
||||
* 执行一系列操作,如果途中发生 {@code NPE} 和 {@code IndexOutOfBoundsException},返回一个空的{@code Opt}
|
||||
*
|
||||
* @param supplier 操作
|
||||
* @param <T> 类型
|
||||
* @return 操作执行后的值
|
||||
*/
|
||||
public static <T> Opt<T> exec(Supplier<T> supplier) {
|
||||
public static <T> Opt<T> ofTry(Func0<T> supplier) {
|
||||
try {
|
||||
return Opt.ofNullable(supplier.get());
|
||||
} catch (NullPointerException | IndexOutOfBoundsException e) {
|
||||
return empty();
|
||||
return Opt.ofNullable(supplier.call());
|
||||
} catch (Exception e) {
|
||||
final Opt<T> empty = Opt.empty();
|
||||
empty.exception = e;
|
||||
return empty;
|
||||
}
|
||||
}
|
||||
|
||||
@ -129,6 +132,7 @@ public class Opt<T> {
|
||||
* 包裹里实际的元素
|
||||
*/
|
||||
private final T value;
|
||||
private Exception exception;
|
||||
|
||||
/**
|
||||
* {@code Opt}的构造函数
|
||||
@ -151,16 +155,7 @@ public class Opt<T> {
|
||||
* @return 包裹里的元素,有可能为{@code null}
|
||||
*/
|
||||
public T get() {
|
||||
return value;
|
||||
}
|
||||
|
||||
/**
|
||||
* 判断包裹里元素的值是否存在,存在为 {@code true},否则为{@code false}
|
||||
*
|
||||
* @return 包裹里元素的值存在为 {@code true},否则为{@code false}
|
||||
*/
|
||||
public boolean isPresent() {
|
||||
return value != null;
|
||||
return this.value;
|
||||
}
|
||||
|
||||
/**
|
||||
@ -173,6 +168,37 @@ public class Opt<T> {
|
||||
return value == null;
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取异常<br>
|
||||
* 当调用 {@link #ofTry(Func0)}时,异常信息不会抛出,而是保存,调用此方法获取抛出的异常
|
||||
*
|
||||
* @return 异常
|
||||
* @since 5.7.17
|
||||
*/
|
||||
public Exception getException(){
|
||||
return this.exception;
|
||||
}
|
||||
|
||||
/**
|
||||
* 是否失败<br>
|
||||
* 当调用 {@link #ofTry(Func0)}时,抛出异常则表示失败
|
||||
*
|
||||
* @return 是否失败
|
||||
* @since 5.7.17
|
||||
*/
|
||||
public boolean isFail(){
|
||||
return null != this.exception;
|
||||
}
|
||||
|
||||
/**
|
||||
* 判断包裹里元素的值是否存在,存在为 {@code true},否则为{@code false}
|
||||
*
|
||||
* @return 包裹里元素的值存在为 {@code true},否则为{@code false}
|
||||
*/
|
||||
public boolean isPresent() {
|
||||
return value != null;
|
||||
}
|
||||
|
||||
/**
|
||||
* 如果包裹里的值存在,就执行传入的操作({@link Consumer#accept})
|
||||
*
|
||||
@ -405,7 +431,18 @@ public class Opt<T> {
|
||||
* @return 如果包裹里元素的值存在,则返回该值,否则返回传入的{@code other}
|
||||
*/
|
||||
public T orElse(T other) {
|
||||
return value != null ? value : other;
|
||||
return isPresent() ? value : other;
|
||||
}
|
||||
|
||||
/**
|
||||
* 异常则返回另一个可选值
|
||||
*
|
||||
* @param other 可选值
|
||||
* @return 如果未发生异常,则返回该值,否则返回传入的{@code other}
|
||||
* @since 5.7.17
|
||||
*/
|
||||
public T exceptionOrElse(T other){
|
||||
return isFail() ? other : value;
|
||||
}
|
||||
|
||||
/**
|
||||
@ -416,7 +453,7 @@ public class Opt<T> {
|
||||
* @throws NullPointerException 如果之不存在,并且传入的操作为空,则抛出 {@code NPE}
|
||||
*/
|
||||
public T orElseGet(Supplier<? extends T> supplier) {
|
||||
return value != null ? value : supplier.get();
|
||||
return isPresent() ? value : supplier.get();
|
||||
}
|
||||
|
||||
/**
|
||||
@ -440,7 +477,7 @@ public class Opt<T> {
|
||||
* @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}
|
||||
*/
|
||||
public <X extends Throwable> T orElseThrow(Supplier<? extends X> exceptionSupplier) throws X {
|
||||
if (value != null) {
|
||||
if (isPresent()) {
|
||||
return value;
|
||||
} else {
|
||||
throw exceptionSupplier.get();
|
||||
@ -464,7 +501,7 @@ public class Opt<T> {
|
||||
* @author VampireAchao
|
||||
*/
|
||||
public <X extends Throwable> T orElseThrow(Function<String, ? extends X> exceptionFunction, String message) throws X {
|
||||
if (value != null) {
|
||||
if (isPresent()) {
|
||||
return value;
|
||||
} else {
|
||||
throw exceptionFunction.apply(message);
|
||||
@ -526,8 +563,6 @@ public class Opt<T> {
|
||||
*/
|
||||
@Override
|
||||
public String toString() {
|
||||
return value != null
|
||||
? value.toString()
|
||||
: null;
|
||||
return StrUtil.toStringOrNull(this.value);
|
||||
}
|
||||
}
|
||||
|
@ -272,6 +272,17 @@ public class StrUtil extends CharSequenceUtil implements StrPool {
|
||||
return String.valueOf(obj);
|
||||
}
|
||||
|
||||
/**
|
||||
* 调用对象的toString方法,null会返回{@code null}
|
||||
*
|
||||
* @param obj 对象
|
||||
* @return 字符串 or {@code null}
|
||||
* @since 5.7.17
|
||||
*/
|
||||
public static String toStringOrNull(Object obj) {
|
||||
return null == obj ? null : obj.toString();
|
||||
}
|
||||
|
||||
/**
|
||||
* 创建StringBuilder对象
|
||||
*
|
||||
|
@ -177,12 +177,12 @@ public class OptTest {
|
||||
String indexOutSituation = Opt.ofEmptyAble(last).map(l -> l.get(0)).orElse("hutool");
|
||||
|
||||
// 现在代码整洁度降低,但可读性up,如果再人说看不懂这代码...
|
||||
String npe = Opt.exec(() -> last.get(0)).orElse("hutool");
|
||||
String indexOut = Opt.exec(() -> {
|
||||
String npe = Opt.ofTry(() -> last.get(0)).exceptionOrElse("hutool");
|
||||
String indexOut = Opt.ofTry(() -> {
|
||||
List<String> list = new ArrayList<>();
|
||||
// 你可以在里面写一长串调用链 list.get(0).getUser().getId()
|
||||
return list.get(0);
|
||||
}).orElse("hutool");
|
||||
}).exceptionOrElse("hutool");
|
||||
Assert.assertEquals(npe, npeSituation);
|
||||
Assert.assertEquals(indexOut, indexOutSituation);
|
||||
Assert.assertEquals("hutool", npe);
|
||||
@ -197,6 +197,4 @@ public class OptTest {
|
||||
private String username;
|
||||
private String nickname;
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user