本文整理了Java中io.vavr.control.Either.getLeft()
方法的一些代码示例,展示了Either.getLeft()
的具体用法。这些代码示例主要来源于Github
/Stackoverflow
/Maven
等平台,是从一些精选项目中提取出来的代码,具有较强的参考意义,能在一定程度帮忙到你。Either.getLeft()
方法的具体详情如下:
包路径:io.vavr.control.Either
类名称:Either
方法名:getLeft
[英]Returns the left value.
[中]返回左值。
代码示例来源:origin: vavr-io/vavr
/**
* Runs an action in the case this is a projection on a Left value.
*
* @param action an action which consumes a Left value
*/
default void orElseRun(Consumer<? super L> action) {
Objects.requireNonNull(action, "action is null");
if (isLeft()) {
action.accept(getLeft());
}
}
代码示例来源:origin: vavr-io/vavr
default Either<L, R> peekLeft(Consumer<? super L> action) {
Objects.requireNonNull(action, "action is null");
if (isLeft()) {
action.accept(getLeft());
}
return this;
}
代码示例来源:origin: vavr-io/vavr
/**
* Gets the Left value or an alternate value, if the projected Either is a Right.
*
* @param other an alternative value
* @return the left value, if the underlying Either is a Left or else {@code other}
* @throws NoSuchElementException if the underlying either of this LeftProjection is a Right
*/
@Override
public L getOrElse(L other) {
return either.isLeft() ? either.getLeft() : other;
}
代码示例来源:origin: vavr-io/vavr
/**
* Applies the given action to the value if the projected either is a Left. Otherwise nothing happens.
*
* @param action An action which takes a left value
* @return this LeftProjection
*/
@Override
public LeftProjection<L, R> peek(Consumer<? super L> action) {
Objects.requireNonNull(action, "action is null");
if (either.isLeft()) {
action.accept(either.getLeft());
}
return this;
}
代码示例来源:origin: vavr-io/vavr
/**
* Gets the {@code Left} value or throws.
*
* @return the left value, if the underlying {@code Either} is a {@code Left}
* @throws NoSuchElementException if the underlying {@code Either} of this {@code LeftProjection} is a {@code Right}
*/
@Override
public L get() {
if (either.isLeft()) {
return either.getLeft();
} else {
throw new NoSuchElementException("LeftProjection.get() on Right");
}
}
代码示例来源:origin: vavr-io/vavr
/**
* FlatMaps this LeftProjection.
*
* @param mapper A mapper
* @param <U> Component type of the mapped left value
* @return this as {@code LeftProjection<L, U>} if a Right is underlying, otherwise a the mapping result of the left value.
* @throws NullPointerException if {@code mapper} is null
*/
@SuppressWarnings("unchecked")
public <U> LeftProjection<U, R> flatMap(Function<? super L, ? extends LeftProjection<? extends U, R>> mapper) {
Objects.requireNonNull(mapper, "mapper is null");
if (either.isLeft()) {
return (LeftProjection<U, R>) mapper.apply(either.getLeft());
} else {
return (LeftProjection<U, R>) this;
}
}
代码示例来源:origin: vavr-io/vavr
/**
* Folds either the left or the right side of this disjunction.
*
* @param leftMapper maps the left value if this is a Left
* @param rightMapper maps the right value if this is a Right
* @param <U> type of the folded value
* @return A value of type U
*/
default <U> U fold(Function<? super L, ? extends U> leftMapper, Function<? super R, ? extends U> rightMapper) {
Objects.requireNonNull(leftMapper, "leftMapper is null");
Objects.requireNonNull(rightMapper, "rightMapper is null");
if (isRight()) {
return rightMapper.apply(get());
} else {
return leftMapper.apply(getLeft());
}
}
代码示例来源:origin: vavr-io/vavr
/**
* Gets the Right value or an alternate value, if the projected Either is a Left.
*
* @param other a function which converts a Left value to an alternative Right value
* @return the right value, if the underlying Either is a Right or else the alternative Right value provided by
* {@code other} by applying the Left value.
*/
default R getOrElseGet(Function<? super L, ? extends R> other) {
Objects.requireNonNull(other, "other is null");
if (isRight()) {
return get();
} else {
return other.apply(getLeft());
}
}
代码示例来源:origin: vavr-io/vavr
/**
* Gets the Left value or an alternate value, if the projected Either is a Right.
*
* @param other a function which converts a Right value to an alternative Left value
* @return the left value, if the underlying Either is a Left or else the alternative Left value provided by
* {@code other} by applying the Right value.
*/
public L getOrElseGet(Function<? super R, ? extends L> other) {
Objects.requireNonNull(other, "other is null");
if (either.isLeft()) {
return either.getLeft();
} else {
return other.apply(either.get());
}
}
代码示例来源:origin: vavr-io/vavr
/**
* Gets the Left value or throws, if the projected Either is a Right.
*
* @param <X> a throwable type
* @param exceptionFunction a function which creates an exception based on a Right value
* @return the left value, if the underlying Either is a Left or else throws the exception provided by
* {@code exceptionFunction} by applying the Right value.
* @throws X if the projected Either is a Right
*/
public <X extends Throwable> L getOrElseThrow(Function<? super R, X> exceptionFunction) throws X {
Objects.requireNonNull(exceptionFunction, "exceptionFunction is null");
if (either.isLeft()) {
return either.getLeft();
} else {
throw exceptionFunction.apply(either.get());
}
}
代码示例来源:origin: vavr-io/vavr
/**
* Gets the Right value or throws, if the projected Either is a Left.
*
* @param <X> a throwable type
* @param exceptionFunction a function which creates an exception based on a Left value
* @return the right value, if the underlying Either is a Right or else throws the exception provided by
* {@code exceptionFunction} by applying the Left value.
* @throws X if the projected Either is a Left
*/
default <X extends Throwable> R getOrElseThrow(Function<? super L, X> exceptionFunction) throws X {
Objects.requireNonNull(exceptionFunction, "exceptionFunction is null");
if (isRight()) {
return get();
} else {
throw exceptionFunction.apply(getLeft());
}
}
代码示例来源:origin: vavr-io/vavr
/**
* Returns {@code Some} value of type L if this is a left projection of a Left value and the predicate
* applies to the underlying value.
*
* @param predicate A predicate
* @return A new Option
*/
public Option<LeftProjection<L, R>> filter(Predicate<? super L> predicate) {
Objects.requireNonNull(predicate, "predicate is null");
return either.isRight() || predicate.test(either.getLeft()) ? Option.some(this) : Option.none();
}
代码示例来源:origin: vavr-io/vavr
/**
* Maps the value of this Either if it is a Left, performs no operation if this is a Right.
*
* <pre>{@code
* import static io.vavr.API.*;
*
* // = Left(2)
* Left(1).mapLeft(i -> i + 1);
*
* // = Right("a")
* Right("a").mapLeft(i -> i + 1);
* }</pre>
*
* @param leftMapper A mapper
* @param <U> Component type of the mapped right value
* @return a mapped {@code Monad}
* @throws NullPointerException if {@code mapper} is null
*/
@SuppressWarnings("unchecked")
default <U> Either<U, R> mapLeft(Function<? super L, ? extends U> leftMapper) {
Objects.requireNonNull(leftMapper, "leftMapper is null");
if (isLeft()) {
return Either.left(leftMapper.apply(getLeft()));
} else {
return (Either<U, R>) this;
}
}
代码示例来源:origin: vavr-io/vavr
/**
* Maps either the left or the right side of this disjunction.
*
* @param leftMapper maps the left value if this is a Left
* @param rightMapper maps the right value if this is a Right
* @param <X> The new left type of the resulting Either
* @param <Y> The new right type of the resulting Either
* @return A new Either instance
*/
default <X, Y> Either<X, Y> bimap(Function<? super L, ? extends X> leftMapper, Function<? super R, ? extends Y> rightMapper) {
Objects.requireNonNull(leftMapper, "leftMapper is null");
Objects.requireNonNull(rightMapper, "rightMapper is null");
if (isRight()) {
return new Right<>(rightMapper.apply(get()));
} else {
return new Left<>(leftMapper.apply(getLeft()));
}
}
代码示例来源:origin: vavr-io/vavr
@Override
public Iterator<L> iterator() {
if (either.isLeft()) {
return Iterator.of(either.getLeft());
} else {
return Iterator.empty();
}
}
代码示例来源:origin: vavr-io/vavr
/**
* Creates a {@code Validation} of an {@code Either}.
*
* @param either An {@code Either}
* @param <E> error type
* @param <T> value type
* @return A {@code Valid(either.get())} if either is a Right, otherwise {@code Invalid(either.getLeft())}.
* @throws NullPointerException if either is null
*/
static <E, T> Validation<E, T> fromEither(Either<E, T> either) {
Objects.requireNonNull(either, "either is null");
return either.isRight() ? valid(either.get()) : invalid(either.getLeft());
}
代码示例来源:origin: vavr-io/vavr
/**
* Returns this as {@code Validation}.
*
* @return {@code Validation.valid(get())} if this is right, otherwise {@code Validation.invalid(getLeft())}.
*/
default Validation<L, R> toValidation() {
return isRight() ? Validation.valid(get()) : Validation.invalid(getLeft());
}
代码示例来源:origin: vavr-io/vavr
/**
* Converts a {@code Left} to a {@code Right} vice versa by wrapping the value in a new type.
*
* @return a new {@code Either}
*/
default Either<R, L> swap() {
if (isRight()) {
return new Left<>(get());
} else {
return new Right<>(getLeft());
}
}
代码示例来源:origin: vavr-io/vavr
rightValues = rightValues.append(either.get());
} else {
return Either.left(either.getLeft());
代码示例来源:origin: io.vavr/vavr
/**
* Gets the Left value or an alternate value, if the projected Either is a Right.
*
* @param other an alternative value
* @return the left value, if the underlying Either is a Left or else {@code other}
* @throws NoSuchElementException if the underlying either of this LeftProjection is a Right
*/
@Override
public L getOrElse(L other) {
return either.isLeft() ? either.getLeft() : other;
}
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