Created
December 9, 2024 04:38
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A wrapper to do functional try catch in case if exception occurs
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| package com.the_mgi.util; | |
| import java.util.List; | |
| import java.util.function.Supplier; | |
| import static java.util.Objects.nonNull; | |
| import static java.util.Objects.requireNonNull; | |
| public class Catchable<T> { | |
| private final Supplier<T> supplier; | |
| private T result = null; | |
| private Catchable(Supplier<T> supplier) { | |
| this.supplier = supplier; | |
| } | |
| public <E extends Throwable> Catchable<T> execute(List<Class<E>> throwables) { | |
| requireNonNull(throwables); | |
| try { | |
| this.result = this.supplier.get(); | |
| return this; | |
| } catch (Throwable exception) { | |
| boolean allThrowablesMatch = true; | |
| for (Class<E> throwable : throwables) { | |
| if (throwable.isInstance(exception)) continue; | |
| allThrowablesMatch = false; | |
| break; | |
| } | |
| if (!allThrowablesMatch) throw new RuntimeException("un-catchable exception: " + exception.getClass()); | |
| else this.result = null; | |
| } | |
| return this; | |
| } | |
| public T orElse(T other) { | |
| return nonNull(this.result) ? this.result : other; | |
| } | |
| public T orElseGet(Supplier<T> supplier) { | |
| requireNonNull(supplier); | |
| return nonNull(this.result) ? this.result : supplier.get(); | |
| } | |
| public static <T> Catchable<T> of(Supplier<T> supplier) { | |
| requireNonNull(supplier); | |
| return new Catchable<>(supplier); | |
| } | |
| } |
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