Java Code Examples for java.util.Optional#or()

The following examples show how to use java.util.Optional#or() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: InSyncTracker.java    From besu with Apache License 2.0 6 votes vote down vote up 
private Optional<Boolean> currentSyncStatus(
    final ChainHead localChain,
    final Optional<ChainHeadEstimate> syncTargetChain,
    final Optional<ChainHeadEstimate> bestPeerChain) {
  final Optional<Boolean> inSyncWithSyncTarget =
      syncTargetChain.map(remote -> isInSync(localChain, remote));
  final Optional<Boolean> inSyncWithBestPeer =
      bestPeerChain.map(remote -> isInSync(localChain, remote));
  // If we're out of sync with either peer, we're out of sync
  if (inSyncWithSyncTarget.isPresent() && !inSyncWithSyncTarget.get()) {
    return Optional.of(false);
  }
  if (inSyncWithBestPeer.isPresent() && !inSyncWithBestPeer.get()) {
    return Optional.of(false);
  }
  // Otherwise, if either peer is in sync, we're in sync
  return inSyncWithSyncTarget.or(() -> inSyncWithBestPeer);
}
Example 2
Source File: TestSolution2OptionalConditionalFetching.java    From java-katas with MIT License 6 votes vote down vote up 
@Test
@DisplayName("return an Optional of either a non-null value or from a Supplier")
@Tag("PASSING")
@Order(1)
public void orReturnOptional() {

    Optional<String> defaultOptional = Optional.of("supplied");
    Optional<String> anOptional = Optional.empty();

    /*
     * DONE:
     *  Replace the empty optional to either return the anOptional, if it has a value
     *  or return the defaultOptional (use a Supplier)
     *  Check API: java.util.Optional.or(?)
     */
    Optional<String> nonNullOptional = anOptional.or(() -> defaultOptional);

    assertTrue(nonNullOptional instanceof Optional,
            "The nonNullOptional should be an instance of Optional");

    assertFalse(nonNullOptional.isEmpty(),
            "The nonNullOptional should not be empty");
}
Example 3
Source File: ScreenshotTaker.java    From vividus with Apache License 2.0 5 votes vote down vote up 
@Override
public ru.yandex.qatools.ashot.Screenshot takeAshotScreenshot(SearchContext searchContext,
        Optional<ScreenshotConfiguration> screenshotConfiguration)
{
    Optional<ScreenshotConfiguration> configuration = screenshotConfiguration.or(this::getConfiguration);
    AShot aShot = createAShot(false, configuration);
    return takeScreenshot(searchContext, aShot,
            configuration.map(ScreenshotConfiguration::getScrollableElement).flatMap(Supplier::get));
}
Example 4
Source File: ICALToJsonAttribute.java    From james-project with Apache License 2.0 5 votes vote down vote up 
private Optional<MailAddress> retrieveSender(Mail mail) throws MessagingException {
    Optional<MailAddress> fromMime = StreamUtils.ofOptional(
        Optional.ofNullable(mail.getMessage())
            .map(Throwing.function(MimeMessage::getFrom).orReturn(new Address[]{})))
        .map(address -> (InternetAddress) address)
        .map(InternetAddress::getAddress)
        .map(MaybeSender::getMailSender)
        .flatMap(MaybeSender::asStream)
        .findFirst();

    return fromMime.or(() -> mail.getMaybeSender().asOptional());
}
Example 5
Source File: ContentSearch.java    From milkman with MIT License 4 votes vote down vote up 
private Optional<MatchResult> getPrevMatchFrom(int caretPosition, List<MatchResult> matches) {
    Optional<MatchResult> prev = matches.stream().filter(m -> m.end() < caretPosition).reduce((a,b) -> b); // find last
    return prev.or(() -> matches.stream().filter(m -> m.start() > caretPosition).reduce((a,b) -> b));
}
Example 6
Source File: ContentSearch.java    From milkman with MIT License 4 votes vote down vote up 
private Optional<MatchResult> getNextMatchFrom(int caretPosition, List<MatchResult> matches) {
    Optional<MatchResult> first = matches.stream().filter(m -> m.start() > caretPosition).findFirst();
    return first.or(() -> matches.stream().filter(m -> m.end() < caretPosition).findFirst());
}
Example 7
Source File: Book.java    From Java-Coding-Problems with MIT License 3 votes vote down vote up 
public Optional<String> findStatusPrefer() {

        // fetch an Optional prone to be empty
        Optional<String> status = Optional.empty();

        return status.or(() -> Optional.of(BOOK_STATUS));
    }