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.sfs.util.ExceptionHelper.java

public static <T extends Throwable> Optional<T> unwrapCause(Class<T> exception, Throwable t) {
    int counter = 0;
    Throwable result = t;/* w  w w . j a v  a 2  s  .c o  m*/
    while (result != null && !exception.isAssignableFrom(result.getClass())) {
        if (result.getCause() == null) {
            return Optional.absent();
        }
        if (result.getCause() == result) {
            return Optional.absent();
        }
        if (counter++ > 10) {
            LOGGER.warn("Exception cause unwrapping ran for 10 levels...", t);
            return Optional.absent();
        }
        result = result.getCause();
    }
    if (exception.isAssignableFrom(result.getClass())) {
        return Optional.of((T) result);
    } else {
        return Optional.absent();
    }
}

From source file:org.locationtech.geogig.di.PluginDefaults.java

public PluginDefaults() {
    refs = objects = graph = Optional.absent();
}

From source file:com.arpnetworking.clusteraggregator.AggDataUnifier.java

/**
 * Unifies <code>AggregatedData</code> units.
 * @param aggData List of <code>AggregatedData</code> to unify.
 * @return A new {@code List<AggregatedData>} with unified units.
 */// w  ww.j av a2 s  .c  o  m
public static List<AggregatedData> unify(final Collection<AggregatedData> aggData) {
    Optional<Unit> smallestUnit = Optional.absent();
    for (final AggregatedData data : aggData) {
        smallestUnit = getSmaller(smallestUnit, data.getValue().getUnit());

        for (final Quantity quantity : data.getSamples()) {
            smallestUnit = getSmaller(smallestUnit, quantity.getUnit());
        }
    }

    return FluentIterable.from(aggData).transform(new ConvertUnitTransform(smallestUnit)).toList();
}

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

public static Optional<String> checkForUpdate() {
    try {/*from  w  ww. j a v a  2  s  .  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:org.apache.beam.sdk.extensions.sql.impl.utils.SqlTypeUtils.java

/**
 * Finds an operand with provided type. Returns Optional.absent() if no operand found with
 * matching type//  ww w  . java 2 s .c o  m
 */
public static Optional<BeamSqlExpression> findExpressionOfType(List<BeamSqlExpression> operands,
        SqlTypeName type) {

    for (BeamSqlExpression operand : operands) {
        if (type.equals(operand.getOutputType())) {
            return Optional.of(operand);
        }
    }

    return Optional.absent();
}

From source file:org.opendaylight.openflowplugin.applications.topology.manager.TopologyManagerUtil.java

static void removeAffectedLinks(final NodeId id, final ReadWriteTransaction transaction,
        InstanceIdentifier<Topology> topology) {
    Optional<Topology> topologyOptional = Optional.absent();
    try {//from   w  w w  . ja  v  a2s.  c  o  m
        topologyOptional = transaction.read(LogicalDatastoreType.OPERATIONAL, topology).checkedGet();
    } catch (ReadFailedException e) {
        LOG.warn("Error reading topology data for topology {}: {}", topology, e.getMessage());
        LOG.debug("Error reading topology data for topology.. ", e);
    }
    if (topologyOptional.isPresent()) {
        removeAffectedLinks(id, topologyOptional, transaction, topology);
    }
}

From source file:org.apache.usergrid.persistence.model.entity.EntityMap.java

public static Optional<EntityMap> fromEntity(Optional<Entity> entity) {
    if (entity.isPresent()) {
        EntityMap map = fromEntity(entity.get());
        return Optional.fromNullable(map);
    } else {/*  w  ww . j  av a 2 s.  co  m*/
        return Optional.absent();
    }
}

From source file:org.deephacks.confit.spi.CacheManager.java

/**
 * Lookup the most suitable CacheManager available.
 *
 * @return CacheManager.//from  w w w.  ja  va2 s.co  m
 */
public static Optional<CacheManager> lookup() {
    CacheManager manager = lookup.lookup(CacheManager.class);
    if (manager != null) {
        return Optional.of(manager);
    } else {
        return Optional.absent();
    }
}

From source file:springfox.bean.validators.plugins.BeanValidators.java

public static <T extends Annotation> Optional<T> validatorFromBean(ModelPropertyContext context,
        Class<T> annotationType) {

    Optional<BeanPropertyDefinition> propertyDefinition = context.getBeanPropertyDefinition();
    Optional<T> notNull = Optional.absent();
    if (propertyDefinition.isPresent()) {
        notNull = annotationFrom(propertyDefinition.get().getGetter(), annotationType)
                .or(annotationFrom(propertyDefinition.get().getField(), annotationType));
    }/* w w  w.  ja v  a  2s .c  o m*/
    return notNull;
}

From source file:edu.ksu.cis.santos.mdcf.dml.ast.exp.Exp.java

Exp() {
    this.type = Optional.absent();
}