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:flipkart.mongo.replicator.core.model.ReplicaSetConfig.java

public Optional<Node> findNode(String host, int port) {
    for (Node node : nodes) {
        if (node.host.equals(host) && node.port == port) {
            return Optional.of(node);
        }/* ww  w . j a  v a 2  s .  com*/
    }
    return Optional.absent();
}

From source file:org.sosy_lab.cpachecker.core.algorithm.testgen.util.CFAUtils2.java

/**
 * same as {@link #getAlternativeLeavingEdge(CFAEdge)}, but allows specification of the given edge.
 * Its expected that wrongEdge is a leaving edge of node, but its not checked.
 * @param decidingNode/* ww  w. j a  v  a2s .  co  m*/
 * @param wrongEdge
 * @return
 */
public static Optional<CFAEdge> getAlternativeLeavingEdge(CFANode node, CFAEdge wrongEdge) {
    for (CFAEdge cfaEdge : CFAUtils.leavingEdges(node)) {
        if (cfaEdge.equals(wrongEdge)) {
            continue;
        } else {
            return Optional.of(cfaEdge);
        }
    }
    return Optional.absent();
}

From source file:org.opendaylight.controller.config.facade.xml.mapping.attributes.mapping.UnionCompositeAttributeMappingStrategy.java

@Override
protected Optional<?> mapInnerAttribute(CompositeDataSupport compositeData, String jmxName,
        String description) {/*from   w  w  w . jav a  2s  . c  o m*/
    if (!description.equals(JavaAttribute.DESCRIPTION_OF_VALUE_ATTRIBUTE_FOR_UNION)) {
        return Optional.absent();
    }
    return super.mapInnerAttribute(compositeData, jmxName, description);
}

From source file:org.gradle.api.reporting.model.internal.BasicStringNodeDescriptor.java

@Override
public Optional<String> value(ModelNode modelNode) {
    if (modelNode.getLinkCount() == 0) {
        MutableModelNode modelElementNode = (MutableModelNode) modelNode;
        Object privateData = modelElementNode.getPrivateData();
        return Optional.of(privateData.toString());
    }/* ww w.  j av a2 s  . c  o  m*/
    return Optional.absent();
}

From source file:org.gradle.ide.xcode.internal.xcodeproj.PBXFileReference.java

public PBXFileReference(String name, String path, SourceTree sourceTree) {
    super(name, path, sourceTree);

    // this is necessary to prevent O(n^2) behavior in xcode project loading
    String fileType = FileTypes.FILE_EXTENSION_TO_UTI.get(Files.getFileExtension(name));
    explicitFileType = Optional.fromNullable(fileType);
    lastKnownFileType = Optional.absent();
}

From source file:cc.ilo.cc.ilo.pipeline.producer.IterableProducer.java

@Override
public synchronized Optional<T> getNext() throws InterruptedException {
    if (iterator.hasNext() && !stopped) {
        return Optional.of(iterator.next());
    } else {/*  w  w w .  j  ava 2  s.  c o  m*/
        return Optional.absent();
    }
}

From source file:org.gradle.api.internal.project.RelativeBuildScriptLocationTransformer.java

@Override
public Optional<String> transform(ProjectInternal project) {
    Transformer<String, File> stringFileTransformer = RelativeFileNameTransformer.from(project.getProjectDir());
    File file = project.getBuildScriptSource().getResource().getFile();
    if (null != file) {
        return Optional.of(File.separatorChar + stringFileTransformer.transform(file));
    }/* w w w .java  2 s .  c o  m*/
    return Optional.absent();
}

From source file:org.wisepersist.UserDao.java

@NonTransactional
public Optional<User> findByEmail(String email) {
    TypedQuery<User> query = em().createQuery("SELECT user FROM User user WHERE user.email=:email", User.class);
    query.setParameter("email", email);
    List<User> users = query.getResultList();
    if (users.size() > 0) {
        return Optional.of(users.get(0));
    }//  w  w  w.  j a va  2s  .  c  om
    return Optional.absent();
}

From source file:com.arpnetworking.tsdcore.model.AggregationMessage.java

/**
 * Deserialize message from <code>Buffer</code>.
 *
 * TODO(vkoskela): The header and message need to be versioned [MAI-133].
 *
 * @param data The <code>Buffer</code> containing the serialized message.
 * @return The deserialized <code>AggregationMessage</code> or absent if
 * the <code>Buffer</code> could not be deserialized.
 *///from w w w .j a  v a 2  s  .co  m
public static Optional<AggregationMessage> deserialize(final ByteString data) {
    int position = 0;
    // Make sure we have enough data to get the size
    if (data.length() < HEADER_SIZE_IN_BYTES) {
        return Optional.absent();
    }

    // Deserialize and validate buffer length
    final ByteIterator reader = data.iterator();
    final int length = reader.getInt(ByteOrder.BIG_ENDIAN);
    position += INTEGER_SIZE_IN_BYTES;
    if (data.length() < length) {
        if (LOGGER.isTraceEnabled()) {
            LOGGER.trace(String.format("we only have %d of %d bytes.", data.length(), length));
        }
        return Optional.absent();
    }

    // Deserialize message type
    final byte type = reader.getByte();
    position += BYTE_SIZE_IN_BYTES;

    final byte subType;
    if (typeHasSubtype(type)) {
        subType = reader.getByte();
        position += BYTE_SIZE_IN_BYTES;
    } else {
        subType = 0x00;
    }

    // Obtain the serialized payload
    final byte[] payloadBytes = new byte[length - position];
    reader.getBytes(payloadBytes);

    // Deserialize the message based on the type
    try {
        switch (type) {
        case 0x01:
            return Optional.of(new AggregationMessage(Messages.HostIdentification.parseFrom(payloadBytes)));
        case 0x03:
            return Optional.of(new AggregationMessage(Messages.HeartbeatRecord.parseFrom(payloadBytes)));
        case 0x04:
            return Optional.of(new AggregationMessage(Messages.StatisticSetRecord.parseFrom(payloadBytes)));
        case 0x05:
            // 0x05 is the message type for all supporting data
            switch (subType) {
            case 0x01:
                return Optional
                        .of(new AggregationMessage(Messages.SamplesSupportingData.parseFrom(payloadBytes)));
            case 0x02:
                return Optional.of(
                        new AggregationMessage(Messages.SparseHistogramSupportingData.parseFrom(payloadBytes)));
            default:
                LOGGER.warn(
                        String.format("Invalid protocol buffer, unknown subtype; type=%s, subtype=%s, bytes=%s",
                                type, subType, Hex.encodeHexString(payloadBytes)));
                return Optional.absent();
            }
        default:
            LOGGER.warn(String.format("Unsupported message type; type=%s", type));
            return Optional.absent();
        }
    } catch (final InvalidProtocolBufferException e) {
        LOGGER.warn(String.format("Invalid protocol buffer; type=%s bytes=%s", type,
                Hex.encodeHexString(payloadBytes)), e);
        return Optional.absent();
    }
}

From source file:org.eclipse.buildship.core.workspace.internal.EclipseVmUtil.java

private static Optional<IVMInstall> findRegisteredVM(String version) {
    Optional<IExecutionEnvironment> possibleExecutionEnvironment = findExecutionEnvironment(version);
    if (!possibleExecutionEnvironment.isPresent()) {
        return Optional.absent();
    }//from w  w w . j a va 2s  .c  om

    IExecutionEnvironment executionEnvironment = possibleExecutionEnvironment.get();
    IVMInstall defaultVm = executionEnvironment.getDefaultVM();
    if (defaultVm != null) {
        return Optional.of(defaultVm);
    } else {
        IVMInstall firstVm = Iterables.getFirst(Arrays.asList(executionEnvironment.getCompatibleVMs()), null);
        return Optional.fromNullable(firstVm);
    }
}