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.dswarm.graph.batch.rdf.pnx.utils.NodeTypeUtils.java

public static Optional<NodeType> getNodeType(final Optional<Node> optionalNode,
        final Optional<Boolean> optionalIsType) {

    if (!optionalNode.isPresent()) {

        return Optional.absent();
    }/*  w  ww.j a v a 2 s  .c o m*/

    final NodeType nodeType;
    final Node node = optionalNode.get();

    if (node instanceof Resource) {

        if (optionalIsType.isPresent()) {

            if (Boolean.FALSE.equals(optionalIsType.get())) {

                nodeType = NodeType.Resource;
            } else {

                nodeType = NodeType.TypeResource;
            }
        } else {

            nodeType = NodeType.Resource;
        }
    } else if (node instanceof BNode) {

        if (optionalIsType.isPresent()) {

            if (Boolean.FALSE.equals(optionalIsType.get())) {

                nodeType = NodeType.BNode;
            } else {

                nodeType = NodeType.TypeBNode;
            }
        } else {

            nodeType = NodeType.BNode;
        }
    } else if (node instanceof Literal) {

        nodeType = NodeType.Literal;
    } else {

        nodeType = null;
    }

    return Optional.fromNullable(nodeType);
}

From source file:com.arpnetworking.utility.SampleUtils.java

/**
 * Converts all of the samples to a single unit.
 *
 * @param samples samples to convert/* ww  w .j  a v a  2s.  c  o m*/
 * @return list of samples with a unified unit
 */
public static List<Quantity> unifyUnits(final List<Quantity> samples) {
    //This is a 2-pass operation:
    //First pass is to grab the smallest unit in the samples
    //Second pass is to convert everything to that unit
    Optional<Unit> smallestUnit = Optional.absent();
    for (final Quantity sample : samples) {
        if (!smallestUnit.isPresent()) {
            smallestUnit = sample.getUnit();
        } else if (sample.getUnit().isPresent()
                && smallestUnit.get().getSmallerUnit(sample.getUnit().get()) != smallestUnit.get()) {
            smallestUnit = sample.getUnit();
        }
    }

    if (smallestUnit.isPresent()) {
        return FluentIterable.from(samples).transform(new SampleConverter(smallestUnit.get())).toList();
    }

    return samples;
}

From source file:fi.vm.sade.osoitepalvelu.kooste.common.util.CriteriaHelper.java

public static Optional<Criteria> inAnyKoodiVersion(Criteria c, String key, Collection<String> koodis) {
    if (koodis == null || koodis.isEmpty()) {
        return Optional.absent();
    }//from   ww w  .  ja v  a  2 s.  c  o  m

    Criteria[] criteria = new Criteria[koodis.size()];
    int i = 0;
    for (String koodi : koodis) {
        // Strip the version part if specified:
        Matcher m = KOODI_WITH_VERSION.matcher(koodi);
        if (m.find()) {
            koodi = m.group(1);
        }
        criteria[i++] = Criteria.where(key).regex(Pattern.compile(koodi + OPTIONAL_KOODI_VERSION_POSTFIX));
    }
    return Optional.of(c.orOperator(criteria));
}

From source file:org.brooklyncentral.catalog.scrape.CatalogItemScraper.java

private static Optional<String> getGithubRawText(String repoUrl, String fileName) {
    String rawGithubUrl = generateRawGithubUrl(repoUrl, fileName);

    try (InputStream inputStream = new URL(rawGithubUrl).openStream()) {
        return Optional.of(Streams.readFullyString(inputStream));
    } catch (Exception e) {
        // TODO Log or something: String error =
        // "Unable to read raw Github URL " + rawGithubUrl + ": " + e,
        // e);/*from  w  w  w.  java2 s  .  c o  m*/
        return Optional.absent();
    }
}

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. ja v a2s . 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:org.apache.aurora.scheduler.http.api.security.FieldGetters.java

public static <P extends TBase<P, ?>, C extends TBase<C, ?>, G extends TBase<G, ?>> FieldGetter<P, G> compose(
        final FieldGetter<P, C> parent, final FieldGetter<C, G> child) {

    return new FieldGetter<P, G>() {
        @Override//from  ww w  . j  a  v  a2  s .c  o m
        public Class<P> getStructClass() {
            return parent.getStructClass();
        }

        @Override
        public Class<G> getValueClass() {
            return child.getValueClass();
        }

        @Override
        public Optional<G> apply(P input) {
            Optional<C> parentValue = parent.apply(input);
            if (parentValue.isPresent()) {
                return child.apply(parentValue.get());
            } else {
                return Optional.absent();
            }
        }
    };
}

From source file:springfox.documentation.spring.web.HandlerMethodReturnTypes.java

public static Optional<Class> useType(Class beanType) {
    if (Proxy.class.isAssignableFrom(beanType)) {
        return Optional.absent();
    }/*w w w  . j  a  v  a 2s .  c  o  m*/
    if (Class.class.getName().equals(beanType.getName())) {
        return Optional.absent();
    }
    return Optional.fromNullable(beanType);
}

From source file:com.afterkraft.kraftrpg.api.util.DataUtil.java

public static Optional<DataView> copyFromExisting(DataView data) {
    return Optional.absent();
}

From source file:io.mesosphere.mesos.util.Functions.java

@NotNull
public static <A> Optional<A> headOption(@NotNull final Iterable<A> iterable) {
    final Iterator<A> iter = iterable.iterator();
    if (iter.hasNext()) {
        return Optional.fromNullable(iter.next());
    } else {/*  w w w .java  2s .c o m*/
        return Optional.absent();
    }
}

From source file:org.automagic.deps.doctor.TransitiveDepsGroup.java

public TransitiveDepsGroup() {
    dependencies = new ArrayList<>();
    topLevelDependency = Optional.absent();
}