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:gobblin.data.management.copy.replication.ReplicationMetaData.java

public static ReplicationMetaData buildMetaData(Config config) {
    if (!config.hasPath(ReplicationConfiguration.METADATA)) {
        return new ReplicationMetaData(Optional.<Map<String, String>>absent());
    }//from  w  ww. ja va  2 s.c om

    Config metaDataConfig = config.getConfig(ReplicationConfiguration.METADATA);
    Map<String, String> metaDataValues = new HashMap<>();
    Set<Map.Entry<String, ConfigValue>> meataDataEntry = metaDataConfig.entrySet();
    for (Map.Entry<String, ConfigValue> entry : meataDataEntry) {
        metaDataValues.put(entry.getKey(), metaDataConfig.getString(entry.getKey()));
    }

    ReplicationMetaData metaData = new ReplicationMetaData(Optional.of(metaDataValues));
    return metaData;
}

From source file:org.eclipse.mylyn.internal.wikitext.commonmark.inlines.EmphasisCharactersSpan.java

@Override
public Optional<? extends Inline> createInline(Cursor cursor) {
    Matcher matcher = cursor.matcher(pattern);
    if (matcher.matches()) {
        String group = matcher.group(1);
        return Optional.of(new Characters(cursor.getLineAtOffset(), cursor.getOffset(), group));
    }/*from  w  w w . j a va 2 s  .c o  m*/
    return Optional.absent();
}

From source file:google.registry.tools.server.ToolsServerModule.java

@Provides
@Parameter("fullFieldNames")
static Optional<Boolean> provideFullFieldNames(HttpServletRequest req) {
    String s = emptyToNull(req.getParameter(ListObjectsAction.FULL_FIELD_NAMES_PARAM));
    return (s == null) ? Optional.<Boolean>absent() : Optional.of(Boolean.parseBoolean(s));
}

From source file:nl.ipsen3.service.AuthenticationService.java

@Override
public Optional<User> authenticate(BasicCredentials credentials) throws AuthenticationException {
    User user = userDAO.getByEmailAddress(credentials.getUsername());

    if (user != null && user.getPassword().equals(credentials.getPassword())) {
        return Optional.of(user);
    }/*  ww  w . java2  s . co  m*/

    return Optional.absent();
}

From source file:org.knight.examples.guava.basic.UsingAvoidingNullExamples.java

public void run() {
    Optional<String> o1 = Optional.of("Guava-library");
    if (o1.isPresent()) {
        log("o1: " + o1.get());
    } else {//from  w w  w. jav  a 2  s  .c  om
        log("o1: " + o1.toString());
    }

    Optional<String> o2 = Optional.absent();
    try {
        //will cause a IllegalStateException
        log("o2: " + o2.get());
    } catch (IllegalStateException e) {
        log("o2 is absent, use get() will cause a IllegalStateException.");
    }

    Optional<String> o3 = Optional.fromNullable(null);
    log("o3 present = " + o3.isPresent());
    try {
        //will cause a IllegalStateException
        log("o3: " + o3.get());
    } catch (IllegalStateException e) {
        log("o3 is absent, use get() will cause a IllegalStateException.");
    }
    if (o3.orNull() == null) {
        log("o3 is absent, so orNull() returns null.");
    }

    Optional<String> o4 = Optional.fromNullable("Hello World");
    log("o4: " + o4.or("o4 is present, so this default value will not be printed."));

    Optional<Book> o5 = Optional.of(Book.generateBook());
    log("o5: " + o5.get().toString());
}

From source file:com.dangdang.ddframe.rdb.sharding.parser.jaxb.OptionalAdapter.java

@Override
public Optional<Integer> unmarshal(final String v) throws Exception {
    if (Strings.isNullOrEmpty(v)) {
        return Optional.absent();
    }/*from ww  w. ja va 2 s.  c o m*/
    return Optional.of(Integer.valueOf(v));
}

From source file:co.leugim.jade4ninja.template.JadeI18nHandler.java

public JadeI18nHandler(Messages messages, Context context, Result result) {
    this.messages = messages;
    this.context = context;
    this.result = Optional.of(result);
}

From source file:org.excalibur.core.ssh.SshClientFactory.java

public static SshClient.Factory defaultSshClientFactory() {
    return new SshClient.Factory() {
        int timeout = SystemUtils2.getIntegerProperty("org.excalibur.ssh.default.connection.timeout.ms", 60000);

        Optional<Connector> agentConnector = getAgentConnector();

        @Override/*w w  w  . j a va2  s.  com*/
        public boolean isAgentAvailable() {
            return agentConnector.isPresent();
        }

        @Override
        public SshClient create(HostAndPort socket, LoginCredentials credentials) {
            return new JschSshClient(socket, credentials, timeout, agentConnector,
                    new BackoffLimitedRetryHandler());
        }

        Optional<Connector> getAgentConnector() {
            try {
                return Optional.of(ConnectorFactory.getDefault().createConnector());
            } catch (final AgentProxyException e) {
                return Optional.absent();
            }
        }
    };
}

From source file:de.flapdoodle.javaparser.parboiled.helper.AbstractParameter.java

public List<Parameter> asParameterList() {
    List<Parameter> ret = Lists.newArrayList();

    Optional<AbstractParameter> cur = Optional.of(this);

    Optional<Parameter> parameter;
    do {/*from w w w .ja  va2 s  .co m*/
        parameter = cur.get().asParameter();
        if (parameter.isPresent()) {
            ret.add(parameter.get());
            cur = cur.get().child();
        }
    } while (cur.isPresent() && parameter.isPresent());

    return ret;
}

From source file:org.basepom.mojo.propertyhelper.beans.UuidDefinition.java

public Optional<UUID> getValue() {
    return value == null ? Optional.<UUID>absent() : Optional.of(UUID.fromString(value));
}