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

Introduction

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

Prototype

public static <T> Optional<T> absent()

Source Link

Document

Returns an Optional instance with no contained reference.

Usage

From source file:se.sics.ktoolbox.cc.heartbeat.util.CCValueFactory.java

public static List<KAddress> extractHeartbeatSrc(Collection<byte[]> values) {
    List<KAddress> result = new ArrayList<>();
    for (byte[] value : values) {
        ByteBuf buf = Unpooled.wrappedBuffer(value);
        result.add((KAddress) Serializers.fromBinary(buf, Optional.absent()));
    }//from  w ww  .  j a va 2  s  .co  m
    return result;
}

From source file:org.opendaylight.controller.netconf.persist.impl.PersisterImpl.java

public static Optional<PersisterImpl> createFromProperties(BundleContext bundleContext) {
    String storageAdapterClass = bundleContext.getProperty(STORAGE_ADAPTER_CLASS_PROP);
    StorageAdapter storage;// w w w .j  ava2 s.  c o m
    if (storageAdapterClass == null || storageAdapterClass.equals("")) {
        return Optional.absent();
    }

    try {
        storage = StorageAdapter.class
                .cast(resolveClass(storageAdapterClass, StorageAdapter.class).newInstance());
        storage.setProperties(bundleContext);

    } catch (InstantiationException | IllegalAccessException | ClassNotFoundException e) {
        throw new IllegalArgumentException("Unable to instantiate storage adapter from " + storageAdapterClass,
                e);
    }
    return Optional.of(new PersisterImpl(storage));
}

From source file:google.registry.flows.domain.RegistryExtraFlowLogicProxy.java

public static <D extends DomainBase> Optional<RegistryExtraFlowLogic> newInstanceForDomain(@Nullable D domain)
        throws EppException {
    if (domain == null) {
        return Optional.absent();
    } else {/*www  .  j a v a 2 s.  c  o m*/
        return newInstanceForTld(domain.getTld());
    }
}

From source file:org.opendaylight.yangtools.yang.data.impl.codec.EmptyStringCodec.java

private EmptyStringCodec() {
    super(Optional.absent(), Void.class);
}

From source file:org.mayocat.addons.util.AddonUtils.java

/**
 * Finds a addon group definition in a list of group definitions. The priority of the group definitions is order in
 * which they are passed : first passed has the highest priority, last passed the lowest.
 *
 * @param name the name of the addon group definition to find
 * @param groupDefinitions the list of group definitions
 * @return the first definition found, or absent if none is found
 *///from   w  ww  .  j a va  2s.co m
public static Optional<AddonGroupDefinition> findAddonGroupDefinition(String name,
        Map<String, AddonGroupDefinition>... groupDefinitions) {
    for (Map<String, AddonGroupDefinition> groupDefinition : groupDefinitions) {
        if (groupDefinition.containsKey(name)) {
            return Optional.of(groupDefinition.get(name));
        }
    }
    return Optional.absent();
}

From source file:com.github.kevints.mesos.scheduler.server.LibprocessServletUtils.java

static Optional<String> parseMessageType(HttpServletRequest req) {
    String pathInfo = req.getPathInfo();
    if (pathInfo == null) {
        return Optional.absent();
    }/* w ww.  j a v  a  2  s. c  o m*/

    return Optional.of(Paths.get(pathInfo).getFileName().toString());
}

From source file:org.immutables.fixture.couse.AbstractB.java

default void use() {
    B b = B.builder().a(A.builder().build()).aO(Optional.absent()).build();

    b.toString();
}

From source file:de.Keyle.MyPet.util.UpdateCheck.java

public static Optional<String> checkForUpdate(String plugin) {
    try {// w  w w  .  j av  a 2 s .c om
        String parameter = "";
        parameter += "&package=" + MyPetApi.getCompatUtil().getInternalVersion();
        parameter += "&build=" + MyPetVersion.getBuild();

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

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

From source file:harp.util.FileUtil.java

/**
 * Find a file with the given base name, searching upward from the given starting directory.
 *
 * @param filename the base filename to look for
 * @param startingPath the starting directory to search upward from
 *
 * @return an {@code Optional} containing the Path of the file if found, or an empty Optional
 *     otherwise/*from   w ww.  j a  va 2 s  . c o  m*/
 */
public static Optional<Path> findUpward(String filename, Path startingPath) {
    Preconditions.checkNotNull(filename);
    Preconditions.checkArgument(!filename.contains(File.separator));
    Preconditions.checkArgument(Files.isDirectory(startingPath));
    Path possibleRootDir = startingPath;
    while (possibleRootDir != null) {
        Path possiblePath = possibleRootDir.resolve(filename);
        if (Files.isRegularFile(possiblePath)) {
            return Optional.of(possiblePath);
        } else {
            possibleRootDir = possibleRootDir.getParent();
        }
    }
    return Optional.absent();
}

From source file:de.azapps.tools.Log.java

public static void disableLoggingToFile() {
    writeToFile = false;
    fileWriter = Optional.absent();
}