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.onos.yangtools.yang.data.api.schema.tree.spi.LazyContainerNode.java

@Override
public Optional<TreeNode> getChild(final PathArgument key) {
    // We do not cache the instantiated node as it is dirt cheap
    final Optional<NormalizedNode<?, ?>> child = castData().getChild(key);
    if (child.isPresent()) {
        return Optional.of(TreeNodeFactory.createTreeNode(child.get(), getVersion()));
    }//from   www  . j a v a2  s  .c  o m

    return Optional.absent();
}

From source file:org.opendaylight.controller.netconf.confignetconfconnector.mapping.attributes.mapping.ObjectNameAttributeMappingStrategy.java

@Override
public Optional<MappedDependency> mapAttribute(Object value) {
    if (value == null) {
        return Optional.absent();
    }/*ww w. j  av a2  s .com*/

    String expectedClass = getOpenType().getClassName();
    String realClass = value.getClass().getName();
    Preconditions.checkArgument(realClass.equals(expectedClass),
            "Type mismatch, expected " + expectedClass + " but was " + realClass);
    Util.checkType(value, ObjectName.class);

    ObjectName on = (ObjectName) value;

    String refName = ObjectNameUtil.getReferenceName(on);

    return Optional.of(new MappedDependency(namespace, serviceName, refName));
}

From source file:net.diogobohm.timed.impl.codec.TaskCodecImpl.java

@Override
public Task decode(DBTask task, Activity activity, Project project, Set<Tag> tags) {
    Date start = null;//  w  w  w. ja v a2s  .  c  o m
    Optional<Date> end = Optional.absent();
    String description = task.getDescription();

    try {
        start = DATETIME_FORMATTER.parse(task.getStartDateTime());
        if (task.getFinishDateTime() != null) {
            end = Optional.of(DATETIME_FORMATTER.parse(task.getFinishDateTime()));
        }
    } catch (ParseException ex) {
        ex.printStackTrace();
    }

    return new Task(activity, project, start, end, description, tags);
}

From source file:serposcope.helpers.CookieEncryptionOverride.java

public void update(NinjaProperties properties) throws IllegalArgumentException, IllegalAccessException {
    Optional<SecretKeySpec> secretKeySpec = Optional.absent();

    if (properties.getBooleanWithDefault(NinjaConstant.applicationCookieEncrypted, false)) {

        String secret = properties.getOrDie(NinjaConstant.applicationSecret);
        try {/*w  w  w  .  ja  v  a  2  s.  co m*/
            int maxKeyLengthBits = Cipher.getMaxAllowedKeyLength(ALGORITHM);
            if (maxKeyLengthBits == Integer.MAX_VALUE) {
                maxKeyLengthBits = 256;
            }

            secretKeySpec = Optional
                    .of(new SecretKeySpec(secret.getBytes(), 0, maxKeyLengthBits / Byte.SIZE, ALGORITHM));

            LOG.info("Ninja session encryption is using {} / {} bit.", secretKeySpec.get().getAlgorithm(),
                    maxKeyLengthBits);

        } catch (Exception exception) {
            LOG.error("Can not create class to encrypt cookie.", exception);
            throw new RuntimeException(exception);
        }

    } else {
        secretKeySpec = Optional.absent();
    }

    setSecretKeySpec(secretKeySpec);
}

From source file:org.eclipse.emf.eson.generators.GeneratorHelper.java

/**
 * Find the first occurrence of content of a certain type.
 * // w  w  w .ja va 2  s . c  o  m
 * This helper intentionally, for optional performance, does NOT traverse the entire Resource, but only the first level.
 * 
 * @param resource EMF Resource
 * @param klass Java class to find in first level of getContents() of Resource
 * @return Guava optional
 */
public <T extends EObject> Optional<T> getFirstRootContentOfType(Resource resource, Class<T> klass) {
    if (!resource.isLoaded())
        return Optional.absent();

    EList<EObject> contents = resource.getContents();
    for (EObject eObject : contents) {
        if (klass.isInstance(eObject)) {
            return Optional.of(klass.cast(eObject));
        }
    }
    return Optional.absent();
}

From source file:com.sk89q.worldedit.regions.selector.limit.PermissiveSelectorLimits.java

@Override
public Optional<Integer> getPolyhedronVertexLimit() {
    return Optional.absent();
}

From source file:org.locationtech.geogig.api.plumbing.diff.GenericAttributeDiffImpl.java

public GenericAttributeDiffImpl(@Nullable Optional<?> oldValue, @Nullable Optional<?> newValue) {
    if (oldValue == null) {
        this.oldValue = Optional.absent();
    } else {//from ww  w .  j a  v  a 2 s  .  co  m
        this.oldValue = oldValue;
    }

    if (newValue == null) {
        this.newValue = Optional.absent();
    } else {
        this.newValue = newValue;
    }
}

From source file:org.eclipse.mylyn.internal.wikitext.commonmark.inlines.HtmlEntitySpan.java

@Override
public Optional<? extends Inline> createInline(Cursor cursor) {
    char c = cursor.getChar();
    if (c == '&') {
        Matcher matcher = cursor.matcher(pattern);
        if (matcher.matches()) {
            String ent = matcher.group(1);
            return Optional
                    .of(new HtmlEntity(cursor.getLineAtOffset(), cursor.getOffset(), ent.length() + 2, ent));
        }//ww  w .  ja  v a 2s .  co  m
    }
    return Optional.absent();
}

From source file:gobblin.data.management.copy.replication.CopyRouteGeneratorOptimizer.java

@Override
public Optional<CopyRoute> getPullRoute(ReplicationConfiguration rc, EndPoint copyTo) {
    if (rc.getCopyMode() == ReplicationCopyMode.PUSH)
        return Optional.absent();

    DataFlowTopology topology = rc.getDataFlowToplogy();
    List<DataFlowTopology.DataFlowPath> paths = topology.getDataFlowPaths();

    for (DataFlowTopology.DataFlowPath p : paths) {
        List<CopyRoute> routes = p.getCopyRoutes();
        if (routes.isEmpty()) {
            continue;
        }/*from w ww .  j  a va 2  s .  co  m*/

        if (routes.get(0).getCopyTo().equals(copyTo)) {
            return getOptimizedCopyRoute(routes);
        }
    }

    return Optional.absent();
}

From source file:com.github.kevints.mesos.scheduler.server.LibprocessServletUtils.java

static Optional<PID> getSenderPid(HttpServletRequest req) {
    Optional<String> libprocessFrom = Optional.fromNullable(req.getHeader("X-Libprocess-From"));
    if (libprocessFrom.isPresent()) {
        try {//from   w  ww  .  j a  va  2s  . co m
            return Optional.of(PID.fromString(libprocessFrom.get()));
        } catch (IllegalArgumentException e) {
            return Optional.absent();
        }
    }

    Optional<String> userAgent = Optional.fromNullable(req.getHeader("User-Agent"));
    if (userAgent.isPresent()) {
        List<String> pid = Splitter.on("libprocess/").omitEmptyStrings().splitToList(userAgent.get());
        if (pid.size() != 1) {
            return Optional.absent();
        } else {
            try {
                return Optional.of(PID.fromString(pid.get(0)));
            } catch (IllegalArgumentException e) {
                return Optional.absent();
            }
        }
    }

    return Optional.absent();
}