java-commons/src/main/java/io/gitlab/jfronny/commons/throwable/ThrowingRunnable.java

package io.gitlab.jfronny.commons.throwable;

import org.jetbrains.annotations.ApiStatus;
import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.NotNull;

import java.util.Objects;
import java.util.function.Consumer;

@FunctionalInterface
public interface ThrowingRunnable<TEx extends Throwable> {
    void run() throws TEx;

    @Contract(pure = true) @NotNull @ApiStatus.NonExtendable
    default ThrowingRunnable<TEx> compose(@NotNull ThrowingRunnable<? extends TEx> before) {
        Objects.requireNonNull(before);
        return () -> {
            before.run();
            this.run();
        };
    }

    @Contract(pure = true) @NotNull @ApiStatus.NonExtendable
    default ThrowingRunnable<TEx> andThen(@NotNull ThrowingRunnable<? extends TEx> after) {
        Objects.requireNonNull(after);
        return () -> {
            this.run();
            after.run();
        };
    }

    @Contract(pure = true) @NotNull @ApiStatus.NonExtendable
    default Runnable addHandler(@NotNull Consumer<Throwable> handler) {
        Objects.requireNonNull(handler);
        return () -> {
            try {
                this.run();
            } catch (Throwable e) {
                handler.accept(e);
            }
        };
    }

    @Contract(pure = true) @NotNull @ApiStatus.NonExtendable
    default Runnable addHandler(@NotNull Class<TEx> exception, @NotNull Consumer<TEx> handler) {
        Objects.requireNonNull(handler);
        return () -> {
            try {
                this.run();
            } catch (Throwable e) {
                if (exception.isAssignableFrom(e.getClass()))
                    handler.accept((TEx) e);
                else throw Try.runtimeException(e);
            }
        };
    }

    @Contract(pure = true) @NotNull @ApiStatus.NonExtendable
    default Runnable orThrow() {
        return () -> {
            try {
                this.run();
            } catch (Throwable e) {
                throw Try.runtimeException(e);
            }
        };
    }
}