62 lines
1.8 KiB
Java
62 lines
1.8 KiB
Java
package mcp.util;
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import java.util.Optional;
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public sealed interface Result<E, T extends Throwable> permits Err, Ok {
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default boolean isError() {
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return this instanceof Err;
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}
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default boolean isOk() {
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return this instanceof Ok;
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}
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default E unwrap() throws T {
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return switch (this) {
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case Err<E, T> err -> throw err.throwable();
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case Ok<E, T> ok -> ok.value();
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};
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}
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default E unwrapOrElse(E defaultValue) {
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try {
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return isError() ? defaultValue : unwrap();
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} catch (Throwable e) {
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return defaultValue;
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}
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}
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default Optional<E> toOptional() {
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try {
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return isError() ? Optional.empty() : Optional.of(unwrap());
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} catch (Throwable e) {
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return Optional.empty();
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}
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}
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@SuppressWarnings("unchecked")
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default <R> Result<R, T> map(java.util.function.Function<? super E, ? extends R> mapper) {
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return switch (this) {
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case Ok<E, T> ok -> new Ok<>(mapper.apply(ok.value()));
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case Err<E, T> err -> (Err<R, T>) err;
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};
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}
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@SuppressWarnings("unchecked")
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default <R> Result<R, T> flatMap(java.util.function.Function<? super E, ? extends Result<R, T>> mapper) {
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return switch (this) {
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case Ok<E, T> ok -> mapper.apply(ok.value());
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case Err<E, T> err -> (Err<R, T>) err;
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};
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}
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@SuppressWarnings("unchecked")
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default <F extends Throwable> Result<E, F> mapError(java.util.function.Function<? super T, ? extends F> mapper) {
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return switch (this) {
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case Ok<E, T> ok -> (Ok<E, F>) ok;
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case Err<E, T> err -> new Err<>(mapper.apply(err.throwable()));
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};
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}
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}
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