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:com.github.rinde.rinsim.core.model.pdp.PDPObjectImpl.java

PDPObjectImpl() {
    pdpModel = Optional.absent();
    roadModel = Optional.absent();
    startPosition = Optional.absent();
}

From source file:org.apache.gobblin.util.io.MeteredOutputStream.java

/**
 * Find the lowest {@link MeteredOutputStream} in a chain of {@link FilterOutputStream}s.
 *//*from   w ww  .  ja v  a  2  s  .  co  m*/
public static Optional<MeteredOutputStream> findWrappedMeteredOutputStream(OutputStream os) {
    if (os instanceof FilterOutputStream) {
        try {
            Optional<MeteredOutputStream> meteredOutputStream = findWrappedMeteredOutputStream(
                    FilterStreamUnpacker.unpackFilterOutputStream((FilterOutputStream) os));
            if (meteredOutputStream.isPresent()) {
                return meteredOutputStream;
            }
        } catch (IllegalAccessException iae) {
            log.warn("Cannot unpack input stream due to SecurityManager.", iae);
            // Do nothing, we can't unpack the FilterInputStream due to security restrictions
        }
    }
    if (os instanceof MeteredOutputStream) {
        return Optional.of((MeteredOutputStream) os);
    }
    return Optional.absent();
}

From source file:org.opendaylight.genius.idmanager.AvailableIdHolder.java

@Override
public Optional<Long> allocateId() {
    if (isIdAvailable(0L /*currentTime*/)) { //currentTime parameter not used for fetching Ids from AvailableIds
        long id = cur.incrementAndGet();
        if (id <= high) {
            return Optional.of(id);
        }/*from  w ww .  j a  va 2s. c o  m*/
    }
    return Optional.absent();
}

From source file:com.google.cloud.hadoop.gcsio.ObjectWriteConditions.java

public ObjectWriteConditions() {
    metaGenerationMatch = Optional.absent();
    contentGenerationMatch = Optional.absent();
}

From source file:org.immutables.fixture.couse.sub.Strange.java

default void use() {
    C c = C.builder().a(A.builder().build()).aO(Optional.absent()).build();

    c.toString();
}

From source file:io.github.robwin.swagger2markup.utils.TagUtils.java

/**
 * Retrieves the optional description of a tag.
 *
 * @param tagsMap the Map of tags//  ww w .  j a v a  2s.co m
 * @param tagName the name of the tag
 * @return the optional description of the tag
 */
public static Optional<String> getTagDescription(Map<String, Tag> tagsMap, String tagName) {
    Tag tag = tagsMap.get(tagName);
    if (tag != null) {
        return Optional.fromNullable(tag.getDescription());
    }
    return Optional.absent();
}

From source file:com.eucalyptus.auth.euare.EuareRemoteRegionFilter.java

static Optional<RegionInfo> getRegion(final EuareMessage request) {
    Optional<RegionInfo> region = Optional.absent();
    try {/*from w  w  w.jav  a 2 s . com*/
        if (request instanceof EuareMessageWithDelegate) {
            final EuareMessageWithDelegate messageWithDelegate = (EuareMessageWithDelegate) request;
            final String delegateAliasOrNumber = messageWithDelegate.getDelegateAccount();
            if (delegateAliasOrNumber != null) {
                final String delegateNumber = Accounts.isAccountNumber(delegateAliasOrNumber)
                        ? delegateAliasOrNumber
                        : Accounts.lookupAccountIdByAlias(delegateAliasOrNumber);
                region = regionConfigurationManager.getRegionByAccountNumber(delegateNumber);
            }
        }

        if (!region.isPresent() && request instanceof DownloadServerCertificateType) {
            final DownloadServerCertificateType downloadServerCertificateType = (DownloadServerCertificateType) request;
            final String certArn = downloadServerCertificateType.getCertificateArn();
            if (certArn != null) {
                final String accountNumber = Ern.parse(certArn).getAccount();
                region = regionConfigurationManager.getRegionByAccountNumber(accountNumber);
            }
        } else if (!region.isPresent() && request.getUserId() != null) {
            if (Accounts.isAccountNumber(request.getUserId())) {
                region = regionConfigurationManager.getRegionByAccountNumber(request.getUserId());
            } else {
                region = regionConfigurationManager.getRegionByIdentifier(request.getUserId());
            }
        }

        if (!region.isPresent() && Contexts.exists()) {
            final Context context = Contexts.lookup();
            final String userId = context.getUser().getUserId();
            region = regionConfigurationManager.getRegionByIdentifier(userId);
        }
    } catch (AuthException e) {
        Logs.extreme().error(e, e); // bad alias
    } catch (Exception e) {
        logger.error(e, e);
    }

    return region;
}

From source file:org.geogit.osm.internal.log.ReadOSMMapping.java

@Override
public Optional<Mapping> call() {
    Preconditions.checkNotNull(entry);//  w  w  w.  j  a v a2 s  .  c o  m
    final File osmMapFolder = command(ResolveOSMMappingLogFolder.class).call();
    File file = new File(osmMapFolder, entry.getPostMappingId().toString());
    if (!file.exists()) {
        return Optional.absent();
    }
    try {
        List<String> lines = Files.readLines(file, Charsets.UTF_8);
        String s = Joiner.on("\n").join(lines);
        Mapping mapping = Mapping.fromString(s);
        return Optional.of(mapping);
    } catch (IOException e) {
        throw Throwables.propagate(e);
    }
}

From source file:org.geogit.osm.base.ReadOSMFilterFile.java

@Override
public Optional<String> call() {
    Preconditions.checkNotNull(entry);/*www.ja  v a 2s.  c om*/
    URL url = command(ResolveOSMLogfile.class).call();
    File logfile = new File(url.getFile());
    File file = new File(logfile.getParentFile(), "filter" + entry.getId().toString());
    if (!file.exists()) {
        return Optional.absent();
    }
    try {
        List<String> lines = Files.readLines(file, Charsets.UTF_8);
        String line = Joiner.on("\n").join(lines);
        return Optional.of(line);
    } catch (IOException e) {
        throw Throwables.propagate(e);
    }
}

From source file:se.sics.caracaldb.utils.CustomSerialisers.java

public static Address deserialiseAddress(byte[] data) {
    ByteBuf buf = Unpooled.wrappedBuffer(data);
    Address addr = (Address) SpecialSerializers.AddressSerializer.INSTANCE.fromBinary(buf, Optional.absent());
    buf.release();//from  w  w  w .  j  av  a2  s  .  c  o  m
    return addr;
}