Example usage for java.util Optional of

Introduction

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

Prototype

public static <T> Optional<T> of(T value)

Source Link

Document

Returns an Optional describing the given non- null value.

Usage

From source file:enumj.EnumerableGenerator.java

public static Enumerable<EnumerableGenerator> generators() {
    final Random rnd = new Random(9691);
    return Enumerable.of(() -> Optional.of(new EnumerableGenerator(rnd.nextLong())));
}

From source file:de.mas.wiiu.jnus.utils.FSTUtils.java

public static Optional<FSTEntry> getFSTEntryByFullPath(FSTEntry root, String givenFullPath) {
    String fullPath = givenFullPath.replace(File.separator, "/");
    if (!fullPath.startsWith("/")) {
        fullPath = "/" + fullPath;
    }//from   w  w  w . j a v a  2 s  .  co  m

    String dirPath = FilenameUtils.getFullPathNoEndSeparator(fullPath);
    Optional<FSTEntry> pathOpt = Optional.of(root);
    if (!dirPath.equals("/")) {
        pathOpt = getFileEntryDir(root, dirPath);
    }

    String path = fullPath;

    return pathOpt.flatMap(e -> e.getChildren().stream().filter(c -> c.getFullPath().equals(path)).findAny());
}

From source file:io.klerch.alexa.tellask.util.factory.AlexaSpeechletFactory.java

/**
 * Creates an AlexaSpeechlet from bytes of a speechlet request. It will extract the
 * locale from the request and uses it for creating a new instance of AlexaSpeechlet
 * @param serializedSpeechletRequest bytes of a speechlet request
 * @param speechletClass the class of your AlexaSpeechlet to instantiate
 * @param utteranceReader the reader AlexaSpeechlet should use when reading out utterances
 * @param <T> must extend AlexaSpeechlet
 * @return new instance of AlexaSpeechlet
 * @throws IOException thrown when something went wrong
 *///from w w w .  j  a  v a  2  s .  c o m
public static <T extends AlexaSpeechlet> T createSpeechletFromRequest(final byte[] serializedSpeechletRequest,
        final Class<T> speechletClass, final UtteranceReader utteranceReader) throws IOException {
    final ObjectMapper mapper = new ObjectMapper();

    final JsonNode parser = mapper.readTree(serializedSpeechletRequest);
    final String locale = Optional.of(parser.path("request")).filter(node -> !node.isMissingNode())
            .map(node -> node.path("locale")).filter(node -> !node.isMissingNode()).map(JsonNode::textValue)
            .orElse(DEFAULT_LOCALE);

    try {
        return speechletClass.getConstructor(String.class, UtteranceReader.class).newInstance(locale,
                utteranceReader);
    } catch (InstantiationException | IllegalAccessException | InvocationTargetException
            | NoSuchMethodException e) {
        throw new IOException("Could not create Speechlet from speechlet request", e);
    }
}

From source file:io.helixservice.feature.configuration.locator.AbstractResourceLocator.java

/**
 * {@inheritDoc}//from www.  ja v a2s  .co m
 */
@Override
public Optional<JsonObject> getJsonObject(String resourcePath) {
    Optional<String> string = getString(resourcePath);

    if (string.isPresent()) {
        return Optional.of(new JsonObject(string.get()));
    } else {
        return Optional.empty();
    }
}

From source file:com.ikanow.aleph2.data_model.utils.PropertiesUtils.java

/** Returns the sub-config of a config, or empty if
 * @param config the configuration object
 * @param key the root key of the sub object
 * @return/*  w  w w  .ja  v a2  s  .c o  m*/
 */
public static Optional<Config> getSubConfig(final Config config, final String key) {
    try {
        return Optional.of(config.getConfig(key));
    } catch (Exception e) {
        return Optional.empty();
    }
}

From source file:nu.yona.server.exceptions.UpstreamException.java

private UpstreamException(HttpStatus statusCode, String messageId, String message) {
    super(statusCode, messageId);
    this.message = Optional.of(message);
}

From source file:org.zalando.riptide.StatusCodeSelector.java

@Override
public Optional<Integer> attributeOf(final ClientHttpResponse response) throws IOException {
    return Optional.of(response.getRawStatusCode());
}

From source file:com.qpark.eip.core.model.analysis.operation.GetFlowOperation.java

/**
 * Translate the pattern do SQL <i>like</i>.
 *
 * @param namePattern//w  w  w .  j a  v  a 2 s  . c om
 *            the given name pattern.
 * @return the translated pattern.
 */
private static Optional<String> translateNamePattern(final String namePattern) {
    Optional<String> value = Optional.empty();
    if (Objects.nonNull(namePattern)) {
        String s = namePattern.replace('*', '%');
        if (!s.endsWith("%")) {
            s = String.format("%s%s", s, "%");
        }
        if (!s.startsWith("%")) {
            s = String.format("%s%s", "%", s);
        }
        value = Optional.of(s);
    }
    return value;
}

From source file:io.github.mywarp.mywarp.bukkit.util.versionsupport.MinecraftLocaleParser.java

/**
 * Parses the given String into a Locale.
 *
 * <p>Returns an Optional with the resulting Locale or Optional.absent() if the String cannot be parsed into a
 * Locale.</p>/* w w w.  j  a va2s  . c o m*/
 *
 * @param rawLocale the String to convert
 * @return an Optional with the parsed Locale
 */
static Optional<Locale> parseLocale(String rawLocale) {
    Locale locale = cache.get(rawLocale);
    if (locale == null) {
        try {
            locale = toLocaleCaseInsensitive(rawLocale);
        } catch (RuntimeException e) {
            return Optional.empty();
        }
        cache.put(rawLocale, locale);
    }
    return Optional.of(locale);
}

From source file:org.zalando.riptide.StatusSelector.java

@Override
public Optional<HttpStatus> attributeOf(final ClientHttpResponse response) throws IOException {
    return Optional.of(response.getStatusCode());
}