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:li.klass.fhem.domain.CulHmHeatingMode.java

public static Optional<CulHmHeatingMode> heatingModeFor(String value) {
    if (value.equalsIgnoreCase("MANU")) {
        value = MANUAL.name();// w w w  .  j a  va  2 s  . c  o m
    }
    try {
        return Optional.of(CulHmHeatingMode.valueOf(value.toUpperCase(Locale.getDefault())));
    } catch (Exception e) {
        Log.e(CulHmHeatingMode.class.getName(), "cannot set heating mode from value " + value, e);
        return Optional.absent();
    }
}

From source file:de.flapdoodle.guava.Expectations.java

/**
 * gives one, if only one value exist/*from w w  w .ja  v  a 2  s.co m*/
 * gives none on everything else
 * 
 * @param values
 * @return optional
 */
public static <T> Optional<T> noneOrOneIfOnlyOne(Iterator<T> iterator) {
    Optional<T> ret = intNoneOrOne(iterator);
    if (iterator.hasNext()) {
        return Optional.absent();
    }
    return ret;
}

From source file:org.geogit.api.hooks.Hookables.java

/**
 * Returns the filename to be used for a script corresponding to the hook for a given GeoGit
 * operation. Returns {@link Optional.absent} if the specified operation does not allows hooks
 * //from  w ww  . ja  v a  2  s  .c  o  m
 * @param class the operation
 * @return the string to be used as filename for storing the script files for the corresponding
 *         hook
 */
public static Optional<String> getFilename(Class<? extends AbstractGeoGitOp> clazz) {
    Hookable annotation = clazz.getAnnotation(Hookable.class);
    if (annotation != null) {
        return Optional.of(annotation.name());
    } else {
        return Optional.absent();
    }
}

From source file:com.github.rinde.rinsim.ui.renderers.PointUtil.java

static Optional<Point> intersectionPoint(Point own1, Point own2, Point oth1, Point oth2) {

    final double dx1 = own2.x - own1.x;
    final double dy1 = own2.y - own1.y;
    final double dx2 = oth2.x - oth1.x;
    final double dy2 = oth2.y - oth1.y;

    final double angle1 = Math.PI + Math.atan2(-dy1, -dx1);
    final double angle2 = Math.PI + Math.atan2(-dy2, -dx2);

    final double sin1 = Math.sin(angle1);
    final double sin2 = Math.sin(angle2);
    final double cos1 = Math.cos(angle1);
    final double cos2 = Math.cos(angle2);

    final double d = sin1 * cos2 - sin2 * cos1;
    if (Math.abs(d) < TOLERANCE) {
        return Optional.absent();
    }/*from ww  w  . j a  v  a2 s.  c  o m*/
    final double d1 = Math.hypot(dx1, dy1);
    final double d2 = Math.hypot(dx2, dy2);
    final double offset1 = own2.x * own1.y - own1.x * own2.y / d1;
    final double offset2 = oth2.x * oth1.y - oth1.x * oth2.y / d2;

    return Optional.of(new Point((cos1 * offset2 - cos2 * offset1) / d, (sin1 * offset2 - sin2 * offset1) / d));
}

From source file:com.google.gerrit.server.change.ChangeTriplet.java

/**
 * Parse a triplet out of a string.//from ww w.j  ava2s  . c om
 *
 * @param triplet string of the form "project~branch~id".
 * @return the triplet if the input string has the proper format, or absent if
 *     not.
 */
public static Optional<ChangeTriplet> parse(String triplet) {
    int t2 = triplet.lastIndexOf('~');
    int t1 = triplet.lastIndexOf('~', t2 - 1);
    if (t1 < 0 || t2 < 0) {
        return Optional.absent();
    }

    String project = Url.decode(triplet.substring(0, t1));
    String branch = Url.decode(triplet.substring(t1 + 1, t2));
    String changeId = Url.decode(triplet.substring(t2 + 1));

    ChangeTriplet result = new AutoValue_ChangeTriplet(new Branch.NameKey(new Project.NameKey(project), branch),
            new Change.Key(changeId));
    return Optional.of(result);
}

From source file:org.opendaylight.faas.fabricmgr.FabMgrDatastoreUtil.java

public static <T extends DataObject> Optional<T> readData(final LogicalDatastoreType storeType,
        final InstanceIdentifier<T> path) {
    final ReadTransaction tx = FabMgrDatastoreDependency.getDataProvider().newReadOnlyTransaction();
    CheckedFuture<Optional<T>, ReadFailedException> resultFuture = tx.read(storeType, path);
    try {// w ww  .  ja v  a  2s  .com
        return resultFuture.checkedGet();
    } catch (ReadFailedException e) {
        LOG.error("FABMGR: ERROR: Read failed from DS.", e);
        return Optional.absent();
    }
}

From source file:org.opendaylight.yangtools.yang.data.impl.schema.tree.WriteLeafCandidateNode.java

@Override
@Nonnull
public Optional<NormalizedNode<?, ?>> getDataBefore() {
    return Optional.absent();
}

From source file:org.apache.aurora.scheduler.discovery.ZooKeeperConfig.java

/**
 * Creates a new client configuration with defaults for the session timeout and credentials.
 *
 * @param useCurator {@code true} to use Apache Curator; otherwise commons/zookeeper is used.
 * @param servers ZooKeeper server addresses.
 * @return A new configuration.//from w ww .j  av  a 2  s. co m
 */
public static ZooKeeperConfig create(boolean useCurator, Iterable<InetSocketAddress> servers) {
    return new ZooKeeperConfig(useCurator, servers, Optional.absent(), // chrootPath
            false, ZooKeeperUtils.DEFAULT_ZK_SESSION_TIMEOUT, Optional.absent()); // credentials
}

From source file:com.qcadoo.mes.basic.util.StaffNameExtractor.java

private static Optional<String> extract(final Entity staff, final String firstFieldName,
        final String secondFieldName) {
    if (staff == null) {
        return Optional.absent();
    }/*from  w w  w . j av a 2 s  .  co m*/
    String firstFieldValue = staff.getStringField(firstFieldName);
    String secondFieldValue = staff.getStringField(secondFieldName);
    return Optional.of(String.format("%s %s", firstFieldValue, secondFieldValue));
}

From source file:eu.europa.ec.grow.espd.domain.enums.criteria.CriteriaList.java

public static Optional<CcvCriterion> findById(String uuid) {
    if (CRITERIA.get(uuid) != null) {
        return Optional.of(CRITERIA.get(uuid));
    }//from   ww  w . j a v  a2s  .c o m
    return Optional.absent();
}