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.eclipse.buildship.core.util.file.FileUtils.java

/**
 * Derives a {@code File} instance with absolute path from the specified {@code File} instance.
 *
 * @param file the relative or absolute file of the {@code File} instance to derive
 * @return the absolute {@code File} if the file is not {@code null}, otherwise
 * {@link Optional#absent()}// w  w w . j av a  2s. com
 */
public static Optional<File> getAbsoluteFile(File file) {
    if (file == null) {
        return Optional.absent();
    } else {
        return Optional.of(file.isAbsolute() ? file : file.getAbsoluteFile());
    }
}

From source file:gobblin.runtime.std.DefaultJobSpecScheduleImpl.java

/** Creates a schedule denoting that the job is to be executed immediately */
public static DefaultJobSpecScheduleImpl createImmediateSchedule(JobSpec jobSpec, Runnable jobRunnable) {
    return new DefaultJobSpecScheduleImpl(jobSpec, jobRunnable, Optional.of(System.currentTimeMillis()));
}

From source file:org.asciidoctor.asciidoclet.OutputTemplates.java

static Optional<OutputTemplates> create(DocErrorReporter errorReporter) {
    File dir = prepareTemplateDir(errorReporter);
    return dir == null ? Optional.<OutputTemplates>absent() : Optional.of(new OutputTemplates(dir));
}

From source file:eu.thebluemountain.customers.dctm.brownbag.badcontentslister.config.parser.XMLParsers.java

/**
 * The method returns the attribute value if any
 * @param in provides access to the XML data
 * @param name identifies the attribute to get value of
 * @return the matching value if any//  w w  w.  j a v a 2 s. c  o m
 */
public static Optional<String> getAttribute(XMLStreamReader in, String name) {
    int size = in.getAttributeCount();
    for (int index = 0; index < size; index++) {
        if (in.getAttributeLocalName(index).equals(name)) {
            return Optional.of(in.getAttributeValue(index));
        }
    }
    return Optional.absent();
}

From source file:de.keyle.mypet.npc.util.UpdateCheck.java

public static Optional<String> checkForUpdate() {
    try {//from ww  w.j av a2s.c  o m
        String parameter = "";
        parameter += "build=" + MyPetNpcVersion.getBuild();

        // no data will be saved on the server
        String content = Util.readUrlContent("http://update.mypet-plugin.de/MyPet-NPC?" + parameter);
        JSONParser parser = new JSONParser();
        JSONObject result = (JSONObject) parser.parse(content);

        if (result.containsKey("latest")) {
            return Optional.of(result.get("latest").toString());
        }
    } catch (Exception ignored) {
    }
    return Optional.absent();
}

From source file:springfox.documentation.spring.web.readers.operation.ModelRefs.java

public static Optional<ModelRef> modelRef(Optional<ResolvedType> type, ModelContext modelContext,
        TypeNameExtractor nameExtractor) {
    if (!type.isPresent()) {
        return Optional.absent();
    }/*from w w  w.  j a  v  a2 s  .  c o  m*/
    return Optional.of(modelRef(type.get(), modelContext, nameExtractor));
}

From source file:org.eclipse.buildship.core.util.binding.Validators.java

public static Validator<File> requiredDirectoryValidator(final String prefix) {
    return new Validator<File>() {

        @Override/*  w  w w.  j a va2  s  . co  m*/
        public Optional<String> validate(File file) {
            if (file == null) {
                return Optional.of(NLS.bind(CoreMessages.ErrorMessage_0_MustBeSpecified, prefix));
            } else if (!file.exists()) {
                return Optional.of(NLS.bind(CoreMessages.ErrorMessage_0_DoesNotExist, prefix));
            } else if (!file.isDirectory()) {
                return Optional.of(NLS.bind(CoreMessages.ErrorMessage_0_MustBeDirectory, prefix));
            } else {
                return Optional.absent();
            }
        }
    };
}

From source file:com.google.errorprone.ErrorProneVersion.java

/**
 * Loads the Error Prone version./*from w ww  . j  av  a 2s  .  co  m*/
 *
 * <p>This depends on the Maven build, and will always return {@code Optional.absent()} with
 * other build systems.
 */
public static Optional<String> loadVersionFromPom() {
    try (InputStream stream = ErrorProneVersion.class.getResourceAsStream(PROPERTIES_RESOURCE)) {
        if (stream == null) {
            return Optional.absent();
        }
        Properties mavenProperties = new Properties();
        mavenProperties.load(stream);
        return Optional.of(mavenProperties.getProperty("version"));
    } catch (IOException expected) {
        return Optional.absent();
    }
}

From source file:com.infobip.jira.Version.java

public static Version of(String name, ProjectKey projectKey, Boolean released, Date releaseDate) {

    return new Version(name, Optional.of(projectKey), released, formatter.print(new DateTime(releaseDate)),
            Optional.<Integer>absent());
}

From source file:com.github.rinde.rinsim.geom.LengthData.java

/**
 * Create a new {@link LengthData} instance using the specified length.
 * @param length The length of the connection.
 * @return A new instance./*from w  w w . jav a2 s.  c om*/
 */
public static LengthData create(double length) {
    checkArgument(length >= 0d && Doubles.isFinite(length),
            "Only positive values are allowed for length, it is: %s.", length);
    return new AutoValue_LengthData(Optional.of(length));
}