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:com.github.kevints.mesos.scheduler.server.LibprocessServletUtils.java

static Optional<PID> getSenderPid(HttpServletRequest req) {
    Optional<String> libprocessFrom = Optional.fromNullable(req.getHeader("X-Libprocess-From"));
    if (libprocessFrom.isPresent()) {
        try {//from www .j  a v a  2 s.  co m
            return Optional.of(PID.fromString(libprocessFrom.get()));
        } catch (IllegalArgumentException e) {
            return Optional.absent();
        }
    }

    Optional<String> userAgent = Optional.fromNullable(req.getHeader("User-Agent"));
    if (userAgent.isPresent()) {
        List<String> pid = Splitter.on("libprocess/").omitEmptyStrings().splitToList(userAgent.get());
        if (pid.size() != 1) {
            return Optional.absent();
        } else {
            try {
                return Optional.of(PID.fromString(pid.get(0)));
            } catch (IllegalArgumentException e) {
                return Optional.absent();
            }
        }
    }

    return Optional.absent();
}

From source file:org.opendaylight.controller.netconf.confignetconfconnector.mapping.attributes.toxml.SimpleAttributeWritingStrategy.java

@Override
public void writeElement(Element parentElement, String namespace, Object value) {
    value = preprocess(value);//from ww w  . j  a  v a  2  s . c o m
    Util.checkType(value, String.class);
    Element innerNode = createElement(document, key, (String) value, Optional.of(namespace));
    parentElement.appendChild(innerNode);
}

From source file:org.gradle.api.internal.project.RelativeBuildScriptLocationTransformer.java

@Override
public Optional<String> transform(ProjectInternal project) {
    Transformer<String, File> stringFileTransformer = RelativeFileNameTransformer.from(project.getProjectDir());
    File file = project.getBuildScriptSource().getResource().getFile();
    if (null != file) {
        return Optional.of(File.separatorChar + stringFileTransformer.transform(file));
    }//from w ww .  j a v a  2s . co m
    return Optional.absent();
}

From source file:org.apache.james.transport.mailets.remoteDelivery.AddressesArrayToMailAddressListConverter.java

public static List<MailAddress> getAddressesAsMailAddress(Address[] addresses, final Logger logger) {
    if (addresses == null) {
        return ImmutableList.of();
    }/*  ww w  .  j a va  2s  .  c  o  m*/
    return FluentIterable.from(Arrays.asList(addresses))
            .transform(new Function<Address, Optional<MailAddress>>() {
                @Override
                public Optional<MailAddress> apply(Address input) {
                    try {
                        return Optional.of(new MailAddress(input.toString()));
                    } catch (AddressException e) {
                        logger.debug("Can't parse unsent address: {}", e.getMessage());
                        return Optional.absent();
                    }
                }
            }).filter(new Predicate<Optional<MailAddress>>() {
                @Override
                public boolean apply(Optional<MailAddress> input) {
                    return input.isPresent();
                }
            }).transform(new Function<Optional<MailAddress>, MailAddress>() {
                @Override
                public MailAddress apply(Optional<MailAddress> input) {
                    return input.get();
                }
            }).toList();
}

From source file:org.onos.yangtools.yang.data.api.schema.tree.spi.LazyContainerNode.java

@Override
public Optional<TreeNode> getChild(final PathArgument key) {
    // We do not cache the instantiated node as it is dirt cheap
    final Optional<NormalizedNode<?, ?>> child = castData().getChild(key);
    if (child.isPresent()) {
        return Optional.of(TreeNodeFactory.createTreeNode(child.get(), getVersion()));
    }/*from w  w  w  . ja va2  s .com*/

    return Optional.absent();
}

From source file:org.opennms.newts.rest.Transform.java

private static Optional<Map<String, String>> wrapMap(Map<String, String> map) {
    if (map == null)
        return Optional.<Map<String, String>>absent();
    return Optional.of(map);
}

From source file:org.opendaylight.genius.idmanager.AvailableIdHolder.java

@Override
public Optional<Long> allocateId() {
    if (isIdAvailable(0L /*currentTime*/)) { //currentTime parameter not used for fetching Ids from AvailableIds
        long id = cur.incrementAndGet();
        if (id <= high) {
            return Optional.of(id);
        }//  w w w .  ja  v  a2  s .c o  m
    }
    return Optional.absent();
}

From source file:org.opendaylight.controller.netconf.util.capability.YangModuleCapability.java

@Override
public Optional<String> getCapabilitySchema() {
    return Optional.of(content);
}

From source file:info.gehrels.voting.singleTransferableVote.VoteState.java

public static <CANDIDATE_TYPE extends Candidate> Optional<VoteState<CANDIDATE_TYPE>> forBallotAndElection(
        Ballot<CANDIDATE_TYPE> ballot, Election<CANDIDATE_TYPE> election) {
    validateThat(ballot, is(notNullValue()));
    validateThat(election, is(notNullValue()));

    Optional<Vote<CANDIDATE_TYPE>> vote = ballot.getVote(election);
    if (!vote.isPresent()) {
        return Optional.absent();
    }//ww w.  j  a  va  2 s . co m

    return Optional.of(new VoteState<>(ballot.id, vote.get()));
}

From source file:com.facebook.buck.file.RemoteMavenDownloader.java

public RemoteMavenDownloader(Optional<Proxy> proxy, String mavenRepo,
        Optional<PasswordAuthentication> passwordAuthentication) {
    this.mavenRepo = Optional.of(mavenRepo);
    this.downloader = new HttpDownloader(proxy);
    this.passwordAuthentication = passwordAuthentication;
}