Example usage for com.google.common.base Optional fromNullable

Introduction

In this page you can find the example usage for com.google.common.base Optional fromNullable.

Prototype

public static <T> Optional<T> fromNullable(@Nullable T nullableReference)

Source Link

Document

If nullableReference is non-null, returns an Optional instance containing that reference; otherwise returns Optional#absent .

Usage

From source file:org.apache.gobblin.runtime.ForkThrowableHolder.java

public Optional<Throwable> getThrowable(int forkIdx) {
    return Optional.fromNullable(throwables.get(forkIdx));
}

From source file:org.apache.aurora.scheduler.cron.quartz.CronPredictorImpl.java

@Override
public Optional<Date> predictNextRun(CrontabEntry schedule) {
    CronExpression cronExpression = Quartz.cronExpression(schedule, timeZone);
    // The getNextValidTimeAfter call may return null; eg: if the date is too far in the future.
    return Optional.fromNullable(cronExpression.getNextValidTimeAfter(new Date(clock.nowMillis())));
}

From source file:com.ninjas.movietime.conf.vendor.jackson.MovieTimeJsonMapper.java

@Override
protected Object readInternal(Class<?> clazz, HttpInputMessage inputMessage)
        throws IOException, HttpMessageNotReadableException {
    final Object result = super.readInternal(clazz, inputMessage);
    if (clazz.equals(Optional.class)) {
        return Optional.fromNullable(result);
    }//from  w  w  w.  j a  va 2s .  c  o  m
    return result;
}

From source file:org.knight.examples.guava.basic.UsingAvoidingNullExamples.java

public void run() {
    Optional<String> o1 = Optional.of("Guava-library");
    if (o1.isPresent()) {
        log("o1: " + o1.get());
    } else {//from   w  ww. j  a  v a 2 s.c  om
        log("o1: " + o1.toString());
    }

    Optional<String> o2 = Optional.absent();
    try {
        //will cause a IllegalStateException
        log("o2: " + o2.get());
    } catch (IllegalStateException e) {
        log("o2 is absent, use get() will cause a IllegalStateException.");
    }

    Optional<String> o3 = Optional.fromNullable(null);
    log("o3 present = " + o3.isPresent());
    try {
        //will cause a IllegalStateException
        log("o3: " + o3.get());
    } catch (IllegalStateException e) {
        log("o3 is absent, use get() will cause a IllegalStateException.");
    }
    if (o3.orNull() == null) {
        log("o3 is absent, so orNull() returns null.");
    }

    Optional<String> o4 = Optional.fromNullable("Hello World");
    log("o4: " + o4.or("o4 is present, so this default value will not be printed."));

    Optional<Book> o5 = Optional.of(Book.generateBook());
    log("o5: " + o5.get().toString());
}

From source file:org.whispersystems.websocket.session.WebSocketSessionContext.java

public <T> Optional<T> getAuthenticated(Class<T> clazz) {
    if (clazz.isInstance(authenticated)) {
        return Optional.fromNullable(clazz.cast(authenticated));
    }/*from  ww w  .jav  a2s  . c o  m*/

    return Optional.absent();
}

From source file:se.sics.sweep.webservice.toolbox.Result.java

public static Result ok(Object value) {
    return new Result(Status.OK, Optional.absent(), Optional.fromNullable(value));
}

From source file:eu.numberfour.n4js.N4JSRuntimeCoreWithMockProject.java

@Override
public Optional<? extends IN4JSProject> findProject(URI nestedLocation) {
    if (nestedLocation == null) {
        return Optional.absent();
    }/*from   w  w w .  j a  va  2  s . c  o m*/
    IN4JSProject result = mockProject;
    return Optional.fromNullable(result);
}

From source file:org.vincibean.salestaxes.service.implementations.PoiuytServiceImpl.java

@Override
public Optional<Poiuyt> findPoiuytById(final long poiuytId) {
    return Optional.fromNullable(poiuytRepository.findOne(poiuytId));
}

From source file:com.google.gerrit.server.change.GetAssignee.java

@Override
public Response<AccountInfo> apply(ChangeResource rsrc) throws OrmException {

    Optional<Account.Id> assignee = Optional.fromNullable(rsrc.getChange().getAssignee());
    if (assignee.isPresent()) {
        Account account = accountInfo.create().get(assignee.get());
        return Response.ok(AccountJson.toAccountInfo(account));
    }//  www  .j a v a2s  . com
    return Response.none();
}

From source file:org.croudtrip.db.GcmRegistrationDAO.java

public Optional<GcmRegistration> findByUserId(long userId) {
    return Optional.fromNullable(uniqueResult(namedQuery(GcmRegistration.QUERY_NAME_FIND_BY_USER_ID)
            .setParameter(GcmRegistration.QUERY_PARAM_USER_ID, userId)));
}