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:de.haber.xmind2latex.cli.PropertyLoader.java

/**
 * @param fileName file name of the property file
 * @param propNames names of the properties to read out
 *
 * @return reads out properties 'propName' from the given property file 'fileName' and stored
 * them in the result list in the same order. If a property is not available or the property
 * file cannot be loaded, the corresponding {@link Optional} is absent.
 *//*  ww w .  j  a  v  a2s.c o  m*/
public static List<Optional<String>> getProperties(String fileName, String... propNames) {
    checkNotNull(fileName);
    checkNotNull(propNames);

    List<Optional<String>> result = new ArrayList<Optional<String>>(propNames.length);

    Properties prop = new Properties();
    ClassLoader loader = Thread.currentThread().getContextClassLoader();
    InputStream stream = loader.getResourceAsStream(fileName);
    try {
        prop.load(stream);
        for (String p : propNames) {
            String versionNumber = prop.getProperty(p);
            result.add(Optional.fromNullable(versionNumber));
        }
    } catch (Exception e) {
        for (int i = 0; i < propNames.length; i++) {
            result.add(Optional.<String>absent());
        }
    } finally {
        try {
            Closeables.close(stream, true);
        } catch (IOException e) {
            Throwables.propagate(e);
        }
    }
    return ImmutableList.copyOf(result);
}

From source file:org.whispersystems.textsecuregcm.storage.Account.java

public Optional<Device> getAuthenticatedDevice() {
    return Optional.fromNullable(authenticatedDevice);
}

From source file:com.github.ykrasik.jerminal.internal.util.StringUtils.java

/**
 * Transforms an all-whitespace string to an absent value.
 *
 * @param str String to check.//from  w  w w . ja  va 2s  .c  om
 * @return A present value if the string had any non-whitespace character, or an absent value otherwise.
 */
public static Optional<String> getOptionalString(String str) {
    return Optional.fromNullable(Strings.emptyToNull(str.trim()));
}

From source file:org.geogig.osm.internal.history.Changeset.java

public Optional<Envelope> getWgs84Bounds() {
    return Optional.fromNullable(wgs84Bounds);
}

From source file:org.whispersystems.textsecuregcm.storage.PendingAccountsManager.java

public Optional<String> getCodeForNumber(String number) {
    Optional<String> code = memcacheGet(number);

    if (!code.isPresent()) {
        code = Optional.fromNullable(pendingAccounts.getCodeForNumber(number));

        if (code.isPresent()) {
            memcacheSet(number, code.get());
        }/*from  www. ja va2s  .  c om*/
    }

    return code;
}

From source file:com.spotify.heroic.elasticsearch.StandaloneClientSetup.java

@JsonCreator
public StandaloneClientSetup(@JsonProperty("clusterName") String clusterName,
        @JsonProperty("root") String root) {
    this.clusterName = Optional.fromNullable(clusterName).or(DEFAULT_CLUSTER_NAME);
    this.root = checkDataDirectory(
            Paths.get(Optional.fromNullable(root).or(temporaryDirectory())).toAbsolutePath());
}

From source file:org.jclouds.openstack.marconi.v1.domain.Queue.java

/**
 * @return The key/value metadata for this queue.
 *//*  w w  w.  j  a va  2s .  c o m*/
public Optional<Map<String, String>> getMetadata() {
    return Optional.fromNullable(metadata);
}

From source file:org.apache.myriad.configuration.MyriadExecutorConfiguration.java

public Optional<Double> getJvmMaxMemoryMB() {
    return Optional.fromNullable(jvmMaxMemoryMB);
}

From source file:io.crate.sql.tree.ShowColumns.java

public ShowColumns(QualifiedName table, @Nullable QualifiedName schema, @Nullable String likePattern) {
    this.table = checkNotNull(table, "table is null");
    this.schema = Optional.fromNullable(schema);
    this.likePattern = Optional.fromNullable(likePattern);
    this.where = Optional.absent();
}

From source file:springfox.documentation.swagger.web.ApiListingTagReader.java

@Override
public void apply(ApiListingContext apiListingContext) {
    Class<?> controllerClass = apiListingContext.getGroup().getControllerClass();
    Set<String> tagSet = Optional.fromNullable(AnnotationUtils.findAnnotation(controllerClass, Api.class))
            .transform(tags()).or(Sets.<String>newTreeSet());
    if (tagSet.isEmpty()) {
        tagSet.add(apiListingContext.getGroup().getGroupName());
    }//from  w  w w  .  j a v  a  2s  . c  o  m
    apiListingContext.apiListingBuilder().tags(tagSet);
}