Add flatMapLeft/Right and getLeft/Right to Either (#128)
* clean up code * tree: replace deprecated assertj methods * either: add flatMapLeft and flatMapRight * either: add getLeft and getRight
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7 changed files with 503 additions and 98 deletions
41
README.org
41
README.org
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@ -1184,3 +1184,44 @@
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#+END_SRC
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#+END_SRC
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*** =<T> Either<T, R> flatMapLeft(Function<L, Either<T, R>> f)=
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FlatMap the function across the left value.
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#+being_src java
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Either<Integer, String> either = Either.left(2);
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Either<Integer, String> resultLeft = either.flatMapLeft(l -> Either.left(l * 2));
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Either<Integer, String> resultRight = either.flatMapLeft(l -> Either.right(l * 2));
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#+end_src
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*** =<T> Either<T, R> flatMapRight(Function<L, Either<T, R>> f)=
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FlatMap the function across the right value.
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#+being_src java
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Either<Integer, String> either = Either.right("2");
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Either<Integer, String> resultLeft = either.flatMapRight(l -> Either.left(l * 2));
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Either<Integer, String> resultRight = either.flatMapRight(l -> Either.right(l * 2));
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#+end_src
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*** =Optional<L> getLeft()=
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Returns an Optional containing the left value, if is a left, otherwise returns an empty Optional.
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#+being_src java
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Either<Integer, String> either = Either.right("2");
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Optional<Integer> left = either.getLeft();
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#+end_src
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*** =Optional<R> getRight()=
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Returns an Optional containing the right value, if is a right, otherwise returns an empty Optional.
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#+being_src java
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Either<Integer, String> either = Either.right("2");
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Optional<String> right = either.getRight();
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#+end_src
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@ -21,6 +21,7 @@
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package net.kemitix.mon.experimental.either;
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package net.kemitix.mon.experimental.either;
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import java.util.Optional;
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import java.util.function.Consumer;
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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.Function;
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@ -31,6 +32,7 @@ import java.util.function.Function;
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* @param <R> the type of the Either for right value
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* @param <R> the type of the Either for right value
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* @author Paul Campbell (pcampbell@kemitix.net)
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* @author Paul Campbell (pcampbell@kemitix.net)
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*/
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*/
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@SuppressWarnings("methodcount")
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public interface Either<L, R> {
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public interface Either<L, R> {
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/**
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/**
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@ -96,4 +98,38 @@ public interface Either<L, R> {
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* @return a new Either
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* @return a new Either
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*/
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*/
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public abstract <T> Either<L, T> mapRight(Function<R, T> f);
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public abstract <T> Either<L, T> mapRight(Function<R, T> f);
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/**
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* FlatMap the function across the left value.
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*
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* @param f the function to apply to any left value
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* @param <T> the type to change the left value to
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* @return a new Either if is a Left, else this
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*/
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public abstract <T> Either<T, R> flatMapLeft(Function<L, Either<T, R>> f);
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/**
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* FlatMap the function across the right value.
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*
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* @param f the function to apply to any right value
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* @param <T> the type to change the right value to
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* @return a new Either if is a Right, else this
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*/
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public abstract <T> Either<L, T> flatMapRight(Function<R, Either<L, T>> f);
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/**
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* Returns an Optional containing the left value, if is a left, otherwise
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* returns an empty Optional.
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*
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* @return An Optional containing any left value
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*/
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public abstract Optional<L> getLeft();
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/**
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* Returns an Optional containing the right value, if is a right, otherwise
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* returns an empty Optional.
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*
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* @return An Optional containing any right value
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*/
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public abstract Optional<R> getRight();
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}
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}
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@ -23,6 +23,7 @@ package net.kemitix.mon.experimental.either;
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import lombok.RequiredArgsConstructor;
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import lombok.RequiredArgsConstructor;
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import java.util.Optional;
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import java.util.function.Consumer;
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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.Function;
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@ -62,4 +63,25 @@ class Left<L, R> implements Either<L, R> {
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public <T> Either<L, T> mapRight(final Function<R, T> f) {
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public <T> Either<L, T> mapRight(final Function<R, T> f) {
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return new Left<>(value);
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return new Left<>(value);
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}
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}
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@Override
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public <T> Either<T, R> flatMapLeft(final Function<L, Either<T, R>> f) {
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return f.apply(value);
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}
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@Override
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@SuppressWarnings("unchecked")
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public <T> Either<L, T> flatMapRight(final Function<R, Either<L, T>> f) {
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return (Either<L, T>) this;
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}
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@Override
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public Optional<L> getLeft() {
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return Optional.ofNullable(value);
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}
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@Override
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public Optional<R> getRight() {
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return Optional.empty();
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}
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}
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}
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@ -23,6 +23,7 @@ package net.kemitix.mon.experimental.either;
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import lombok.RequiredArgsConstructor;
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import lombok.RequiredArgsConstructor;
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import java.util.Optional;
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import java.util.function.Consumer;
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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.Function;
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@ -62,4 +63,26 @@ class Right<L, R> implements Either<L, R> {
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public <T> Either<L, T> mapRight(final Function<R, T> f) {
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public <T> Either<L, T> mapRight(final Function<R, T> f) {
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return new Right<>(f.apply(value));
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return new Right<>(f.apply(value));
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}
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}
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@Override
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@SuppressWarnings("unchecked")
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public <T> Either<T, R> flatMapLeft(final Function<L, Either<T, R>> f) {
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return (Either<T, R>) this;
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}
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@Override
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public <T> Either<L, T> flatMapRight(final Function<R, Either<L, T>> f) {
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return f.apply(value);
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}
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@Override
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public Optional<L> getLeft() {
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return Optional.empty();
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}
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@Override
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public Optional<R> getRight() {
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return Optional.ofNullable(value);
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}
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}
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}
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@ -2,10 +2,18 @@ package net.kemitix.mon;
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import net.kemitix.mon.experimental.either.Either;
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import net.kemitix.mon.experimental.either.Either;
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import org.assertj.core.api.WithAssertions;
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import org.assertj.core.api.WithAssertions;
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import org.junit.jupiter.api.DisplayName;
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import org.junit.jupiter.api.Nested;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.Test;
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class EitherTest implements WithAssertions {
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import java.time.Instant;
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import java.util.Optional;
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import java.util.function.BiFunction;
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class EitherTest implements WithAssertions {
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@Nested
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@DisplayName("isLeft()")
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public class IsLeft {
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@Test
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@Test
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void whenLeft_isLeft() {
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void whenLeft_isLeft() {
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//when
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//when
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//then
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//then
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assertThat(either.isLeft()).isTrue();
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assertThat(either.isLeft()).isTrue();
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}
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}
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@Test
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void whenLeft_isNotRight() {
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//when
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final Either<Integer, String> either = Either.left(1);
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//then
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assertThat(either.isRight()).isFalse();
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}
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@Test
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@Test
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void whenRight_isNotLeft() {
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void whenRight_isNotLeft() {
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//when
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//when
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//then
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//then
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assertThat(either.isLeft()).isFalse();
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assertThat(either.isLeft()).isFalse();
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}
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}
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}
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@Nested
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@DisplayName("isRight()")
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public class IsRight {
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@Test
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void whenLeft_isNotRight() {
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//when
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final Either<Integer, String> either = Either.left(1);
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//then
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assertThat(either.isRight()).isFalse();
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}
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@Test
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@Test
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void whenRight_isRight() {
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void whenRight_isRight() {
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//when
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//when
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//then
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//then
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assertThat(either.isRight()).isTrue();
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assertThat(either.isRight()).isTrue();
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}
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}
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}
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@Nested
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@DisplayName("match()")
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public class Match {
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@Test
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@Test
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void whenLeft_matchLeft() {
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void whenLeft_matchLeft() {
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//given
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//given
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right -> fail("Not a right")
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right -> fail("Not a right")
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);
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);
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}
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}
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@Test
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@Test
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void whenRight_matchRight() {
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void whenRight_matchRight() {
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//given
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//given
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right -> assertThat(right).isEqualTo("1")
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right -> assertThat(right).isEqualTo("1")
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);
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);
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}
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}
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}
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@Nested
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@DisplayName("mapLeft()")
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public class MapLeft {
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@Test
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@Test
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void givenLeft_whenMapLeft_thenMap() {
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void givenLeft_whenMapLeft_thenMap() {
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//given
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//given
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right -> fail("Not a right")
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right -> fail("Not a right")
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);
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);
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}
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}
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@Test
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void givenRight_whenMapRight_thenMap() {
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//given
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final Either<Integer, String> either = Either.right("2");
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//when
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final Either<Integer, String> result = either.mapRight(l -> l + "2");
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//then
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result.match(
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left -> fail("Not a left"),
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right -> assertThat(right).isEqualTo("22")
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);
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}
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@Test
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void givenLeft_whenMapRight_thenDoNothing() {
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//given
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final Either<Integer, String> either = Either.left(2);
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//when
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final Either<Integer, String> result = either.mapRight(r -> r + "x");
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//then
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result.match(
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left -> assertThat(left).isEqualTo(2),
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right -> fail("Not a right")
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);
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}
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@Test
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@Test
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void givenRight_whenMapLeft_thenDoNothing() {
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void givenRight_whenMapLeft_thenDoNothing() {
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//given
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//given
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right -> assertThat(right).isEqualTo("2")
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right -> assertThat(right).isEqualTo("2")
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);
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);
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}
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}
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}
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@Nested
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@DisplayName("mapRight()")
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public class MapRight {
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@Test
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void givenRight_whenMapRight_thenMap() {
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//given
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final Either<Integer, String> either = Either.right("2");
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//when
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final Either<Integer, String> result = either.mapRight(l -> l + "2");
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//then
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result.match(
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left -> fail("Not a left"),
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right -> assertThat(right).isEqualTo("22")
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);
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}
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@Test
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void givenLeft_whenMapRight_thenDoNothing() {
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//given
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final Either<Integer, String> either = Either.left(2);
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//when
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final Either<Integer, String> result = either.mapRight(r -> r + "x");
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//then
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result.match(
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left -> assertThat(left).isEqualTo(2),
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right -> fail("Not a right")
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);
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}
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}
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@Nested
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@DisplayName("flatMapLeft()")
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public class FlatMapLeft {
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@Test
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void givenLeft_whenFlatMapLeft_whenResultLeft_thenIsNewLeft() {
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//given
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Either<Integer, String> either = Either.left(2);
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//when
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Either<Integer, String> result = either.flatMapLeft(l -> Either.left(l * 2));
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//then
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result.match(
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left -> assertThat(left).isEqualTo(4),
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right -> fail("Not a right")
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);
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}
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@Test
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void givenLeft_whenFlatMapLeft_whenResultRight_thenIsRight() {
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//given
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Either<Integer, String> either = Either.left(2);
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//when
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Either<Integer, String> result = either.flatMapLeft(l -> Either.right("recovered"));
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//then
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result.match(
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left -> fail("Not a left"),
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right -> assertThat(right).isEqualTo("recovered")
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);
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}
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@Test
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void givenRight_whenFlatMapLeft_thenDoNothing() {
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//given
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Either<Integer, String> either = Either.right("2");
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//when
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Either<Integer, String> result = either.flatMapLeft(l -> Either.left(l * 2));
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//then
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result.match(
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left -> fail("Not a left"),
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right -> assertThat(right).isEqualTo("2")
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);
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}
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}
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@Nested
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@DisplayName("flatMapRight()")
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public class FlatMapRight {
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@Test
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void givenLeft_whenFlatMapRight_thenDoNothing() {
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//given
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Either<Integer, String> either = Either.left(2);
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//when
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Either<Integer, String> result = either.flatMapRight(l -> Either.right(l + "2"));
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//then
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result.match(
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left -> assertThat(left).isEqualTo(2),
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right -> fail("Not a right")
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);
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}
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@Test
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void givenRight_whenFlatMapRight_whenResultRight_thenIsNewRight() {
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//given
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Either<Integer, String> either = Either.right("2");
|
||||||
|
//when
|
||||||
|
Either<Integer, String> result = either.flatMapRight(l -> Either.right(l + "2"));
|
||||||
|
//then
|
||||||
|
result.match(
|
||||||
|
left -> fail("Not a left"),
|
||||||
|
right -> assertThat(right).isEqualTo("22")
|
||||||
|
);
|
||||||
|
}
|
||||||
|
@Test
|
||||||
|
void givenRight_whenFlatMapRight_whenResultLeft_thenIsLeft() {
|
||||||
|
//given
|
||||||
|
Either<Integer, String> either = Either.right("2");
|
||||||
|
//when
|
||||||
|
Either<Integer, String> result = either.flatMapRight(l -> Either.left(7));
|
||||||
|
//then
|
||||||
|
result.match(
|
||||||
|
left -> assertThat(left).isEqualTo(7),
|
||||||
|
right -> fail("Not a right")
|
||||||
|
);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
@Nested @DisplayName("getLeft") public class GetLeft {
|
||||||
|
@Test
|
||||||
|
@DisplayName("")
|
||||||
|
public void whenLeft_thenGetValue() {
|
||||||
|
//given
|
||||||
|
Either<String, Integer> either = Either.left("value");
|
||||||
|
//when
|
||||||
|
Optional<String> left = either.getLeft();
|
||||||
|
//then
|
||||||
|
assertThat(left).contains("value");
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
@DisplayName("")
|
||||||
|
public void whenRight_thenGetEmpty() {
|
||||||
|
//given
|
||||||
|
Either<Integer, String> either = Either.right("value");
|
||||||
|
//when
|
||||||
|
Optional<Integer> left = either.getLeft();
|
||||||
|
//then
|
||||||
|
assertThat(left).isEmpty();
|
||||||
|
}
|
||||||
|
}
|
||||||
|
@Nested @DisplayName("getRight") public class GetRight {
|
||||||
|
@Test
|
||||||
|
@DisplayName("")
|
||||||
|
public void whenLeft_thenGetEmpty() {
|
||||||
|
//given
|
||||||
|
Either<String, Integer> either = Either.left("value");
|
||||||
|
//when
|
||||||
|
Optional<Integer> left = either.getRight();
|
||||||
|
//then
|
||||||
|
assertThat(left).isEmpty();
|
||||||
|
}
|
||||||
|
|
||||||
|
@Test
|
||||||
|
@DisplayName("")
|
||||||
|
public void whenRight_thenGetValue() {
|
||||||
|
//given
|
||||||
|
Either<Integer, String> either = Either.right("value");
|
||||||
|
//when
|
||||||
|
Optional<String> left = either.getRight();
|
||||||
|
//then
|
||||||
|
assertThat(left).contains("value");
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// @Nested
|
||||||
|
// @DisplayName("compose()")
|
||||||
|
// public class Compose {
|
||||||
|
//
|
||||||
|
// BiFunction<String, String, Either<String, Integer>> leftToLeftComposer =
|
||||||
|
// (la, lb) -> Either.left(la + lb);
|
||||||
|
//
|
||||||
|
// BiFunction<String, String, Either<String, Integer>> leftToRightComposer =
|
||||||
|
// (la, lb) -> Either.right(Integer.parseInt(la) + Integer.parseInt(lb));
|
||||||
|
//
|
||||||
|
// BiFunction<Integer, Integer, Either<String, Integer>> rightToLeftComposer =
|
||||||
|
// (la, lb) -> Either.left("" + la + lb);
|
||||||
|
//
|
||||||
|
// BiFunction<Integer, Integer, Either<String, Integer>> rightToRightComposer =
|
||||||
|
// (la, lb) -> Either.right(la + lb);
|
||||||
|
//
|
||||||
|
// @Test
|
||||||
|
// public void givenRightAndRight_whenComposeRight_then() {
|
||||||
|
// //given
|
||||||
|
// Either<String, Integer> ea = Either.right(3);
|
||||||
|
// Either<String, Integer> eb = Either.right(7);
|
||||||
|
// //when
|
||||||
|
// Either<String, Integer> result = ea.compose(eb,
|
||||||
|
// leftToRightComposer,
|
||||||
|
// rightToRightComposer);
|
||||||
|
// //then
|
||||||
|
// result.match(
|
||||||
|
// left -> fail("Not a left"),
|
||||||
|
// right -> assertThat(right).isEqualTo(10)
|
||||||
|
// );
|
||||||
|
// }
|
||||||
|
//
|
||||||
|
// @Test
|
||||||
|
// public void givenRightAndRight_whenComposeLeft_then() {
|
||||||
|
// //given
|
||||||
|
// Either<String, Integer> ea = Either.right(3);
|
||||||
|
// Either<String, Integer> eb = Either.right(7);
|
||||||
|
// //when
|
||||||
|
// Either<String, Integer> result = ea.compose(eb,
|
||||||
|
// leftToLeftComposer,
|
||||||
|
// rightToLeftComposer);
|
||||||
|
// //then
|
||||||
|
// result.match(
|
||||||
|
// left -> assertThat(left).isEqualTo("a+b"),
|
||||||
|
// right -> fail("Not a right")
|
||||||
|
// );
|
||||||
|
// }
|
||||||
|
// // compose left with left
|
||||||
|
// @Test
|
||||||
|
// public void givenLeftAndLeft_whenComposeRight_then() {
|
||||||
|
// //given
|
||||||
|
// Either<String, Integer> ea = Either.left("3");
|
||||||
|
// Either<String, Integer> eb = Either.left("7");
|
||||||
|
// //when
|
||||||
|
// Either<String, Integer> result = ea.compose(eb,
|
||||||
|
// leftToRightComposer,
|
||||||
|
// rightToRightComposer);
|
||||||
|
// //then
|
||||||
|
// result.match(
|
||||||
|
// left -> fail("Not a left"),
|
||||||
|
// right -> assertThat(right).isEqualTo(10)
|
||||||
|
// );
|
||||||
|
// }
|
||||||
|
// @Test
|
||||||
|
// public void givenLeftAndLeft_whenComposeLeft_then() {
|
||||||
|
// //given
|
||||||
|
// Either<String, Integer> ea = Either.left("3");
|
||||||
|
// Either<String, Integer> eb = Either.left("7");
|
||||||
|
// //when
|
||||||
|
// Either<String, Integer> result = ea.compose(eb,
|
||||||
|
// leftToLeftComposer,
|
||||||
|
// rightToLeftComposer);
|
||||||
|
// //then
|
||||||
|
// result.match(
|
||||||
|
// left -> fail("Not a left"),
|
||||||
|
// right -> assertThat(right).isEqualTo(10)
|
||||||
|
// );
|
||||||
|
// }
|
||||||
|
// // compose left with right
|
||||||
|
// @Test
|
||||||
|
// public void givenLeftAndRight_whenComposeRight_then() {
|
||||||
|
// //given
|
||||||
|
// Either<String, Integer> ea = Either.left("3");
|
||||||
|
// Either<String, Integer> eb = Either.right(7);
|
||||||
|
// //when
|
||||||
|
// Either<String, Integer> result = ea.compose(eb,
|
||||||
|
// leftToRightComposer,
|
||||||
|
// rightToRightComposer);
|
||||||
|
// //then
|
||||||
|
// result.match(
|
||||||
|
// left -> fail("Not a left"),
|
||||||
|
// right -> assertThat(right).isEqualTo(10)
|
||||||
|
// );
|
||||||
|
// }
|
||||||
|
// @Test
|
||||||
|
// public void givenLeftAndRight_whenComposeLeft_then() {
|
||||||
|
// //given
|
||||||
|
// Either<String, Integer> ea = Either.left("3");
|
||||||
|
// Either<String, Integer> eb = Either.right(7);
|
||||||
|
// //when
|
||||||
|
// Either<String, Integer> result = ea.compose(eb,
|
||||||
|
// leftToLeftComposer,
|
||||||
|
// rightToLeftComposer);
|
||||||
|
// //then
|
||||||
|
// result.match(
|
||||||
|
// left -> fail("Not a left"),
|
||||||
|
// right -> assertThat(right).isEqualTo(10)
|
||||||
|
// );
|
||||||
|
// }
|
||||||
|
// // compose right with left
|
||||||
|
// @Test
|
||||||
|
// public void givenRightAndLeft_whenComposeRight_then() {
|
||||||
|
// //given
|
||||||
|
// Either<String, Integer> ea = Either.right(3);
|
||||||
|
// Either<String, Integer> eb = Either.left("7");
|
||||||
|
// //when
|
||||||
|
// Either<String, Integer> result = ea.compose(eb,
|
||||||
|
// leftToRightComposer,
|
||||||
|
// rightToRightComposer);
|
||||||
|
// //then
|
||||||
|
// result.match(
|
||||||
|
// left -> fail("Not a left"),
|
||||||
|
// right -> assertThat(right).isEqualTo(10)
|
||||||
|
// );
|
||||||
|
// }
|
||||||
|
// @Test
|
||||||
|
// public void givenRightAndLeft_whenComposeLeft_then() {
|
||||||
|
// //given
|
||||||
|
// Either<String, Integer> ea = Either.right(3);
|
||||||
|
// Either<String, Integer> eb = Either.left("7");
|
||||||
|
// //when
|
||||||
|
// Either<String, Integer> result = ea.compose(eb,
|
||||||
|
// leftToLeftComposer,
|
||||||
|
// rightToLeftComposer);
|
||||||
|
// //then
|
||||||
|
// result.match(
|
||||||
|
// left -> fail("Not a left"),
|
||||||
|
// right -> assertThat(right).isEqualTo(10)
|
||||||
|
// );
|
||||||
|
// }
|
||||||
|
// }
|
||||||
}
|
}
|
||||||
|
|
|
@ -86,7 +86,7 @@ class MutableTreeTest implements WithAssertions {
|
||||||
asList(
|
asList(
|
||||||
MutableTree.leaf(sid2),
|
MutableTree.leaf(sid2),
|
||||||
MutableTree.leaf(sid3)));
|
MutableTree.leaf(sid3)));
|
||||||
assertThat(result).isEqualToComparingFieldByFieldRecursively(expectedTree);
|
assertThat(result).usingRecursiveComparison().isEqualTo(expectedTree);
|
||||||
}
|
}
|
||||||
|
|
||||||
@Test
|
@Test
|
||||||
|
|
|
@ -65,7 +65,7 @@ class TreeBuilderTest {
|
||||||
final Tree<Node> result = rootBuilder.build();
|
final Tree<Node> result = rootBuilder.build();
|
||||||
//then
|
//then
|
||||||
assertThat(result.count()).isEqualTo(3);
|
assertThat(result.count()).isEqualTo(3);
|
||||||
assertThat(result).isEqualToComparingFieldByFieldRecursively(
|
assertThat(result).usingRecursiveComparison().isEqualTo(
|
||||||
MutableTree.of(rootNode, Collections.singleton(
|
MutableTree.of(rootNode, Collections.singleton(
|
||||||
MutableTree.of(childNode, Collections.singleton(
|
MutableTree.of(childNode, Collections.singleton(
|
||||||
MutableTree.leaf(grandchildNode))))));
|
MutableTree.leaf(grandchildNode))))));
|
||||||
|
@ -86,7 +86,7 @@ class TreeBuilderTest {
|
||||||
.build();
|
.build();
|
||||||
//then
|
//then
|
||||||
assertThat(result.count()).isEqualTo(4);
|
assertThat(result.count()).isEqualTo(4);
|
||||||
assertThat(result).isEqualToComparingFieldByFieldRecursively(
|
assertThat(result).usingRecursiveComparison().isEqualTo(
|
||||||
MutableTree.of(rootNode, asList(
|
MutableTree.of(rootNode, asList(
|
||||||
MutableTree.leaf(child1Node),
|
MutableTree.leaf(child1Node),
|
||||||
MutableTree.leaf(child2Node),
|
MutableTree.leaf(child2Node),
|
||||||
|
|
Loading…
Reference in a new issue