Example usage for java.util Optional ofNullable

Introduction

In this page you can find the example usage for java.util Optional ofNullable.

Prototype

@SuppressWarnings("unchecked")
public static <T> Optional<T> ofNullable(T value)

Source Link

Document

Returns an Optional describing the given value, if non- null , otherwise returns an empty Optional .

Usage

From source file:io.curly.artifact.service.DefaultArtifactCommand.java

@Override
@Loggable/*from ww w. j  ava2s .c  o m*/
@HystrixCommand(fallbackMethod = "defaultFindAllOwned", ignoreExceptions = IllegalStateException.class, commandProperties = @HystrixProperty(name = EXECUTION_ISOLATION, value = SEMAPHORE))
public Observable<Optional<Page<Artifact>>> findAllOwned(Pageable pageable, User user) {
    return new ObservableResult<Optional<Page<Artifact>>>() {
        @Override
        public Optional<Page<Artifact>> invoke() {
            return Optional.ofNullable(artifactService.findAllOwned(pageable, user));
        }
    };
}

From source file:com.toptal.conf.SecurityUtils.java

/**
 * Authentication object.//from   w  w w .  j a  v  a2 s. c o  m
 * @return Authentication.
 */
private static Optional<Authentication> getAuthentication() {
    return Optional.ofNullable(SecurityContextHolder.getContext().getAuthentication());
}

From source file:at.gridtec.lambda4j.function.bi.BiBooleanFunction.java

/**
 * Lifts a partial {@link BiBooleanFunction} into a total {@link BiBooleanFunction} that returns an {@link Optional}
 * result./*  ww  w. ja v a2  s  .c o m*/
 *
 * @param <R> The type of return value from the function
 * @param partial A function that is only defined for some values in its domain
 * @return A partial {@code BiBooleanFunction} lifted into a total {@code BiBooleanFunction} that returns an {@code
 * Optional} result.
 * @throws NullPointerException If given argument is {@code null}
 */
@Nonnull
static <R> BiBooleanFunction<Optional<R>> lift(@Nonnull final BiBooleanFunction<? extends R> partial) {
    Objects.requireNonNull(partial);
    return (value1, value2) -> Optional.ofNullable(partial.apply(value1, value2));
}

From source file:io.github.retz.db.Jobs.java

public Optional<Job> getJob(int id) throws SQLException, IOException {
    try (PreparedStatement p = conn.prepareStatement("SELECT json FROM jobs WHERE id=?")) {
        p.setInt(1, id);/*www.java2 s.co  m*/
        try (ResultSet res = p.executeQuery()) {
            if (res.next()) {
                String json = res.getString("json");
                return Optional.ofNullable(mapper.readValue(json, Job.class));
            }
        }
    }
    return Optional.empty();
}

From source file:utils.gce.GoogleComputeEngineClient.java

public void setZone(String zoneName) {
    GoogleComputeEngineClient.zoneName = Optional.ofNullable(zoneName);
}

From source file:com.github.robozonky.app.runtime.LivenessCheck.java

@Override
protected Optional<String> transform(final String source) {
    return Optional.ofNullable(source);
}

From source file:com.devicehive.handler.command.CommandSubscribeRequestHandler.java

private Collection<DeviceCommand> findCommands(String device, Collection<String> names, Date timestamp) {
    return Optional.ofNullable(timestamp).map(t -> hazelcastService.find(null, names,
            Collections.singleton(device), LIMIT, t, null, null, DeviceCommand.class))
            .orElse(Collections.emptyList());
}

From source file:at.gridtec.lambda4j.function.tri.TriFunction.java

/**
 * Lifts a partial {@link TriFunction} into a total {@link TriFunction} that returns an {@link Optional} result.
 *
 * @param <T> The type of the first argument to the function
 * @param <U> The type of the second argument to the function
 * @param <V> The type of the third argument to the function
 * @param <R> The type of return value from the function
 * @param partial A function that is only defined for some values in its domain
 * @return A partial {@code TriFunction} lifted into a total {@code TriFunction} that returns an {@code Optional}
 * result./*from  w ww  .ja  v  a 2 s . co m*/
 * @throws NullPointerException If given argument is {@code null}
 */
@Nonnull
static <T, U, V, R> TriFunction<T, U, V, Optional<R>> lift(
        @Nonnull final TriFunction<? super T, ? super U, ? super V, ? extends R> partial) {
    Objects.requireNonNull(partial);
    return (t, u, v) -> Optional.ofNullable(partial.apply(t, u, v));
}

From source file:fi.hsl.parkandride.core.service.PredictionService.java

private Optional<Predictor> getPredictor(String predictorType) {
    Optional<Predictor> predictor = Optional.ofNullable(predictorsByType.get(predictorType));
    if (!predictor.isPresent()) {
        log.warn("Predictor {} not installed", predictorType);
    }/*from  w  w  w. j  a  va2  s  .c  o m*/
    return predictor;
}

From source file:org.eclipse.hono.service.auth.device.CredentialsApiAuthProvider.java

/**
 * Registers a check that verifies connection to Hono's <em>Credentials</em>
 * service.// w  ww  . j  a v  a  2  s.c  o  m
 */
@Override
public void registerReadinessChecks(final HealthCheckHandler readinessHandler) {
    readinessHandler.register("connected-to-credentials-service", status -> {
        Future<Boolean> checkResult = Optional.ofNullable(credentialsClient).map(client -> client.isConnected())
                .orElse(Future.succeededFuture(Boolean.FALSE));
        checkResult.map(connected -> {
            if (connected) {
                status.tryComplete(Status.OK());
            } else {
                status.tryComplete(Status.KO());
            }
            return null;
        });
    });
}