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:org.gerryai.planning.model.domain.Precondition.java

/**
 * Private constructor to create an empty precondition.
 */
private Precondition() {
    precondition = Optional.absent();
}

From source file:com.facebook.buck.android.ProguardTranslatorFactory.java

private static Optional<Map<String, String>> loadOptionalRawMap(ExecutionContext context,
        Optional<Path> proguardFullConfigFile, Optional<Path> proguardMappingFile) throws IOException {
    if (!proguardFullConfigFile.isPresent()) {
        return Optional.absent();
    }/*from  w ww. j  ava2s  .  c  om*/

    ProjectFilesystem projectFilesystem = context.getProjectFilesystem();
    Path pathToProguardConfig = proguardFullConfigFile.get();

    // Proguard doesn't print a mapping when obfuscation is disabled.
    boolean obfuscationSkipped = Iterables.any(projectFilesystem.readLines(pathToProguardConfig),
            Predicates.equalTo("-dontobfuscate"));
    if (obfuscationSkipped) {
        return Optional.absent();
    }

    List<String> lines = projectFilesystem.readLines(proguardMappingFile.get());
    return Optional.of(ProguardMapping.readClassMapping(lines));
}

From source file:org.anhonesteffort.flock.crypto.KeyHelper.java

public static Optional<MasterCipher> getMasterCipher(Context context) throws IOException {
    Optional<byte[]> cipherKeyBytes = KeyStore.getCipherKey(context);
    Optional<byte[]> macKeyBytes = KeyStore.getMacKey(context);

    if (!cipherKeyBytes.isPresent() || !macKeyBytes.isPresent())
        return Optional.absent();

    SecretKey cipherKey = new SecretKeySpec(cipherKeyBytes.get(), "AES");
    SecretKey macKey = new SecretKeySpec(cipherKeyBytes.get(), "SHA256");

    return Optional.of(new MasterCipher(cipherKey, macKey));
}

From source file:org.anhonesteffort.flock.sync.key.KeySyncUtil.java

private static Optional<HidingCalDavCollection> getKeyCollection(Context context, DavAccount account)
        throws PropertyParseException, DavException, IOException {
    HidingCalDavStore store = DavAccountHelper.getHidingCalDavStore(context, account, null);
    Optional<String> calendarHomeSet = store.getCalendarHomeSet();
    if (calendarHomeSet.isPresent())
        return store.getCollection(calendarHomeSet.get().concat(PATH_KEY_COLLECTION));

    return Optional.absent();
}

From source file:google.registry.util.UrlFetchUtils.java

private static Optional<String> getHeaderFirstInternal(Iterable<HTTPHeader> hdrs, String name) {
    name = Ascii.toLowerCase(name);/*from  w w  w  .j  a v  a2s  . com*/
    for (HTTPHeader header : hdrs) {
        if (Ascii.toLowerCase(header.getName()).equals(name)) {
            return Optional.of(header.getValue());
        }
    }
    return Optional.absent();
}

From source file:se.sics.dozy.DozyResult.java

public DozyResult(Status status, Optional<String> details) {
    this.status = status;
    this.details = details;
    this.value = Optional.absent();
}

From source file:org.pau.assetmanager.business.HistoricalStockValuesBusiness.java

public static Optional<HistoricalStockValue> getHistoricalLastValueForSymbol(String symbol) {
    String query = "select historicalStockValue from HistoricalStockValue historicalStockValue where symbol = :symbol order by year desc, month desc";
    List<HistoricalStockValue> optionalHistoricalStockValue = DaoFunction
            .<HistoricalStockValue>querySimpleListFunction("symbol", symbol).apply(query);
    if (optionalHistoricalStockValue.size() > 0) {
        return Optional.of(optionalHistoricalStockValue.iterator().next());
    } else {/*from   w ww.  j av  a2 s  .  c  om*/
        return Optional.absent();
    }
}

From source file:com.dowdandassociates.gentoo.bootstrap.BootstrapInstanceInformation.java

public BootstrapInstanceInformation() {
    instance = Optional.absent();
    volume = Optional.absent();
}

From source file:org.opendaylight.unimgr.mef.nrp.common.MountPointHelper.java

/**
 * Find a node's NETCONF mount point and then retrieve its DataBroker.
 * e.g./*w  ww .  j  a  va2  s.c  om*/
 * http://localhost:8080/restconf/config/network-topology:network-topology/
 *        topology/topology-netconf/node/{nodeName}/yang-ext:mount/
 */
public static Optional<DataBroker> getDataBroker(MountPointService mountService, String nodeName) {
    NodeId nodeId = new NodeId(nodeName);

    InstanceIdentifier<Node> nodeInstanceId = InstanceIdentifier.builder(NetworkTopology.class)
            .child(Topology.class, new TopologyKey(new TopologyId(TopologyNetconf.QNAME.getLocalName())))
            .child(Node.class, new NodeKey(nodeId)).build();

    final Optional<MountPoint> nodeOptional = mountService.getMountPoint(nodeInstanceId);

    if (!nodeOptional.isPresent()) {
        return Optional.absent();
    }

    MountPoint nodeMountPoint = nodeOptional.get();
    return Optional.of(nodeMountPoint.getService(DataBroker.class).get());
}

From source file:org.jclouds.aws.filters.FormSignerUtils.java

private static Optional<String> getAnnotatedApiVersion(Invocation invocation) {
    final Invokable<?, ?> invokable = invocation.getInvokable();
    if (invokable.isAnnotationPresent(ApiVersionOverride.class)) {
        return Optional.fromNullable(invokable.getAnnotation(ApiVersionOverride.class).value());
    } else {// w  ww.j a v a  2  s . c o  m
        final Class<?> owner = invokable.getOwnerType().getRawType();
        if (owner.isAnnotationPresent(ApiVersionOverride.class)) {
            return Optional.fromNullable(owner.getAnnotation(ApiVersionOverride.class).value());
        }
    }
    return Optional.absent();
}