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:com.github.nethad.clustermeister.api.impl.ExecutorServiceMode.java

/**
 * Bundles Callables/Runnables and executes them after the given count.
 * @param batchSize number of Callables/Runnables to bundle
 * @return //from w  w w .  jav  a  2 s . co m
 */
public static ExecutorServiceMode batchSizeContraint(int batchSize) {
    return new GenericExecutorServiceMode(Optional.<Long>absent(), Optional.fromNullable(batchSize));
}

From source file:com.spotify.ffwd.noop.NoopOutputPlugin.java

@JsonCreator
public NoopOutputPlugin(@JsonProperty("flushInterval") Long flushInterval) {
    this.flushInterval = Optional.fromNullable(flushInterval).or(DEFAULT_FLUSH_INTERVAL);
}

From source file:eu.cloudwave.wp5.feedback.eclipse.base.infrastructure.config.ConfigLoaderImpl.java

/**
 * {@inheritDoc}// w  ww  .j  a v a2s. com
 */
@Override
public Optional<String> get(final String path, final String key) {
    final Properties properties = new Properties();
    final InputStream fileInputStream = getClass().getClassLoader().getResourceAsStream(path);
    try {
        properties.load(fileInputStream);
    } catch (final IOException e) {
        return Optional.absent();
    }
    return Optional.fromNullable(properties.getProperty(key));
}

From source file:com.eucalyptus.context.ContextPropagationChannelInterceptor.java

@Override
protected Optional<Context> obtainPropagatingContext(final Message<?> message,
        final MessageChannel messageChannel) {
    Optional<Context> context = Optional.fromNullable(Contexts.threadLocal());
    final String correlationId = message.getPayload() instanceof BaseMessage
            ? ((BaseMessage) message.getPayload()).getCorrelationId()
            : null;// ww w .  j a v a 2 s.co m
    if (!context.isPresent() || !context.get().getCorrelationId().equals(correlationId)) {
        if (Contexts.exists(correlationId)) {
            try {
                final Context messageContext = Contexts.lookup(correlationId);
                context = Optional.of(messageContext);
            } catch (NoSuchContextException ignored) {
            }
        }
    }
    return context;
}

From source file:com.weigandtconsulting.javaschool.cache.BookService.java

public static Optional<Book> getBookDetailsFromGoogleBooks(String isbn13) throws IOException {
    //        Properties properties = NetworkUtil.getProperties();
    //        String key = properties.getProperty(Constants.GOOGLE_API_KEY);
    String url = "https://www.googleapis.com/books/v1/volumes?q=isbn:" + isbn13;
    String response = NetworkUtil.getHttpResponse(url);
    Map bookMap = NetworkUtil.getObjectMapper().readValue(response, Map.class);
    Object bookDataListObj = bookMap.get("items");
    Book book = null;/*ww w  . j  a v  a2s .c om*/
    if (bookDataListObj == null || !(bookDataListObj instanceof List)) {
        return Optional.fromNullable(book);
    }

    List bookDataList = (List) bookDataListObj;
    if (bookDataList.size() < 1) {
        return Optional.fromNullable(null);
    }

    Map bookData = (Map) bookDataList.get(0);
    Map volumeInfo = (Map) bookData.get("volumeInfo");
    book = new Book();
    book.setTitle(getFromJsonResponse(volumeInfo, "title", ""));
    book.setPublisher(getFromJsonResponse(volumeInfo, "publisher", ""));
    List authorDataList = (List) volumeInfo.get("authors");
    for (Object authorDataObj : authorDataList) {
        Author author = new Author();
        author.setName(authorDataObj.toString());
        book.addAuthor(author);
    }
    book.setIsbn13(isbn13);
    book.setSummary(getFromJsonResponse(volumeInfo, "description", ""));
    book.setPageCount(Integer.parseInt(getFromJsonResponse(volumeInfo, "pageCount", "0")));
    book.setPublishedDate(getFromJsonResponse(volumeInfo, "publishedDate", ""));

    return Optional.fromNullable(book);
}

From source file:android.support.test.espresso.Root.java

private Root(Builder builder) {
    this.decorView = checkNotNull(builder.decorView);
    this.windowLayoutParams = Optional.fromNullable(builder.windowLayoutParams);
}

From source file:im.dadoo.teak.biz.bo.impl.DefaultLinkBO.java

@Override
public Optional<LinkPO> update(long id, String name, String url, String description) {
    LinkPO linkPO = this.linkDAO.findById(id);
    if (linkPO != null) {
        linkPO.setName(name);// w  ww .  ja v a2  s  .  co m
        linkPO.setUrl(url);
        linkPO.setDescription(description);
        this.linkDAO.updateAllById(linkPO);
    }
    return Optional.fromNullable(linkPO);
}

From source file:org.apache.brooklyn.rest.domain.ApiError.java

/**
 * @return An {@link ApiError.Builder} whose message is initialised to either the throwable's
 *         message or the throwable's class name if the message is null and whose details are
 *         initialised to the throwable's stack trace.
 *//*  w ww. j ava  2 s  . co m*/
public static Builder builderFromThrowable(Throwable t) {
    checkNotNull(t, "throwable");
    String message = Optional.fromNullable(t.getMessage()).or(t.getClass().getName());
    return builder().message(message).details(Throwables.getStackTraceAsString(t));
}

From source file:gobblin.metrics.InnerMeter.java

InnerMeter(MetricContext context, String name, ContextAwareMeter contextAwareMeter) {
    this.name = name;

    Optional<MetricContext> parentContext = context.getParent();
    if (parentContext.isPresent()) {
        this.parentMeter = Optional.fromNullable(parentContext.get().contextAwareMeter(name));
    } else {/*from w  w  w .j  ava  2  s  .c  o  m*/
        this.parentMeter = Optional.absent();
    }
    this.contextAwareMeter = new WeakReference<>(contextAwareMeter);
}

From source file:com.datastax.driver.core.schemabuilder.CreateType.java

CreateType(String keyspaceName, String typeName) {
    validateNotEmpty(keyspaceName, "Keyspace name");
    validateNotEmpty(typeName, "Custom type name");
    validateNotKeyWord(keyspaceName, String
            .format("The keyspace name '%s' is not allowed because it is a reserved keyword", keyspaceName));
    validateNotKeyWord(typeName, String
            .format("The custom type name '%s' is not allowed because it is a reserved keyword", typeName));
    this.typeName = typeName;
    this.keyspaceName = Optional.fromNullable(keyspaceName);
}