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

Introduction

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

Prototype

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

Source Link

Document

Returns an Optional instance containing the given non-null reference.

Usage

From source file:org.apache.druid.server.router.TimeBoundaryTieredBrokerSelectorStrategy.java

@Override
public Optional<String> getBrokerServiceName(TieredBrokerConfig tierConfig, Query query) {
    // Somewhat janky way of always selecting highest priority broker for this type of query
    if (query instanceof TimeBoundaryQuery) {
        return Optional.of(Iterables.getFirst(tierConfig.getTierToBrokerMap().values(),
                tierConfig.getDefaultBrokerServiceName()));
    }/* w  w  w .j  a va  2 s  .c  o  m*/

    return Optional.absent();
}

From source file:com.dangdang.ddframe.rdb.sharding.parsing.parser.context.OrderItem.java

public OrderItem(final String name, final OrderType type, final Optional<String> alias) {
    this.owner = Optional.absent();
    this.name = Optional.of(name);
    this.type = type;
    this.alias = alias;
}

From source file:google.registry.util.UrlFetchUtils.java

private static Optional<String> getHeaderFirstInternal(Iterable<HTTPHeader> hdrs, String name) {
    name = Ascii.toLowerCase(name);/*w  w  w .ja  v a 2s .  co  m*/
    for (HTTPHeader header : hdrs) {
        if (Ascii.toLowerCase(header.getName()).equals(name)) {
            return Optional.of(header.getValue());
        }
    }
    return Optional.absent();
}

From source file:com.google.errorprone.refaster.UBlock.java

static Choice<Unifier> unifyStatementList(Iterable<? extends UStatement> statements,
        Iterable<? extends StatementTree> targets, Unifier unifier) {
    Choice<UnifierWithUnconsumedStatements> choice = Choice
            .of(UnifierWithUnconsumedStatements.create(unifier, ImmutableList.copyOf(targets)));
    for (UStatement statement : statements) {
        choice = choice.thenChoose(statement);
    }/*from   w w w . ja  v  a2 s.c  o m*/
    return choice.thenOption(new Function<UnifierWithUnconsumedStatements, Optional<Unifier>>() {
        @Override
        public Optional<Unifier> apply(UnifierWithUnconsumedStatements state) {
            return state.unconsumedStatements().isEmpty() ? Optional.of(state.unifier())
                    : Optional.<Unifier>absent();
        }
    });
}

From source file:net.pterodactylus.sonitus.io.FlacIdentifier.java

/**
 * Tries to identify the FLAC file contained in the given stream.
 *
 * @param inputStream/*from  www. j ava 2s.c  om*/
 *       The input stream
 * @return The identified metadata, or {@link Optional#absent()} if the
 *         metadata can not be identified
 * @throws IOException
 *       if an I/O error occurs
 */
public static Optional<Metadata> identify(InputStream inputStream) throws IOException {
    Optional<Stream> stream = Stream.parse(inputStream);
    if (!stream.isPresent()) {
        return Optional.absent();
    }

    List<MetadataBlock> streamInfos = stream.get().metadataBlocks(STREAMINFO);
    if (streamInfos.isEmpty()) {
        /* FLAC file without STREAMINFO is invalid. */
        return Optional.absent();
    }

    MetadataBlock streamInfoBlock = streamInfos.get(0);
    StreamInfo streamInfo = (StreamInfo) streamInfoBlock.data();

    return Optional
            .of(new Metadata(new FormatMetadata(streamInfo.numberOfChannels(), streamInfo.sampleRate(), "FLAC"),
                    new ContentMetadata()));
}

From source file:com.tinspx.util.base.Base.java

/**
 * Attempts to parse the integer if is an Integer, Number, or CharSequence
 *///from w w w . ja  v  a2 s .c o m
public static Optional<Integer> parseInt(@Nullable Object o) {
    if (o instanceof Integer) {
        return Optional.of((Integer) o);
    } else if (o instanceof Number) {
        return Optional.of(((Number) o).intValue());
    } else if (o instanceof CharSequence) {
        return Optional.fromNullable(Ints.tryParse(o.toString()));
    } else {
        return Optional.absent();
    }
}

From source file:com.eucalyptus.auth.tokens.RoleSecurityTokenAttributes.java

public static <T extends RoleSecurityTokenAttributes> Optional<T> fromContext(Class<T> type) {
    try {/*from ww  w.  ja v a 2s.co  m*/
        final Context context = Contexts.lookup();
        final UserPrincipal principal = context.getUser();
        if (principal != null) {
            final Optional<RoleSecurityTokenAttributes> attributes = RoleSecurityTokenAttributes
                    .forUser(principal);
            if (attributes.isPresent() && type.isInstance(attributes.get())) {
                return Optional.of(type.cast(attributes.get()));
            }
        }
    } catch (final IllegalContextAccessException e) {
        // absent
    }
    return Optional.absent();

}

From source file:org.robotninjas.util.callable.DecoratedCallableFunction.java

void setTimeout(long duration, TimeUnit unit) {
    this.unit = Optional.of(unit);
    this.duration = Optional.of(duration);
}

From source file:org.opendaylight.controller.config.facade.xml.mapping.attributes.toxml.ObjectNameAttributeWritingStrategy.java

@Override
public void writeElement(Element parentElement, String namespace, Object value) {
    Util.checkType(value, ObjectNameAttributeMappingStrategy.MappedDependency.class);
    Element innerNode = XmlUtil.createElement(document, key, Optional.of(namespace));

    String moduleName = ((ObjectNameAttributeMappingStrategy.MappedDependency) value).getServiceName();
    String refName = ((ObjectNameAttributeMappingStrategy.MappedDependency) value).getRefName();
    String namespaceForType = ((ObjectNameAttributeMappingStrategy.MappedDependency) value).getNamespace();

    Element typeElement = XmlUtil.createTextElementWithNamespacedContent(document, XmlMappingConstants.TYPE_KEY,
            XmlMappingConstants.PREFIX, namespaceForType, moduleName);

    innerNode.appendChild(typeElement);//from   w  w  w.  j  a va 2  s .  c o m

    final Element nameElement = XmlUtil.createTextElement(document, XmlMappingConstants.NAME_KEY, refName,
            Optional.<String>absent());
    innerNode.appendChild(nameElement);

    parentElement.appendChild(innerNode);
}

From source file:io.dockstore.common.Utilities.java

public static ImmutablePair<String, String> executeCommand(String command, OutputStream stdoutStream,
        OutputStream stderrStream) {
    return executeCommand(command, true, Optional.of(stdoutStream), Optional.of(stderrStream));
}