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.locationtech.geogig.storage.mongo.MongoConflictsDatabase.java

@Override
public Optional<Conflict> getConflict(@Nullable String namespace, String path) {
    DBObject query = new BasicDBObject();
    query.put("path", path);
    if (namespace != null) {
        query.put("namespace", namespace);
    }/*  w w  w  .  j av  a 2 s .  c om*/
    DBObject result = conflicts.findOne(query);
    if (result == null) {
        return Optional.absent();
    } else {
        ObjectId ancestor = ObjectId.valueOf((String) result.get("ancestor"));
        ObjectId ours = ObjectId.valueOf((String) result.get("ours"));
        ObjectId theirs = ObjectId.valueOf((String) result.get("theirs"));
        return Optional.of(new Conflict(path, ancestor, ours, theirs));
    }
}

From source file:org.mayocat.image.ImageDimensionsMetadataExtractor.java

public Optional<Map<String, Object>> extractMetadata(LoadedAttachment attachment) {
    if (!AttachmentUtils.isImage(attachment)) {
        return Optional.absent();
    }//from w w  w  .j a va 2  s  .  c om

    try {
        Image image = attachment.getData().getObject(new LoadImageFunction(imageProcessor), Image.class);

        final int imageWidth = image.getWidth(null);
        final int imageHeight = image.getHeight(null);

        image.flush();

        Map<String, Object> result = new HashMap<String, Object>() {
            {
                put("width", imageWidth);
                put("height", imageHeight);
            }
        };

        return Optional.of(result);
    } catch (Exception e) {
        logger.warn("Failed to extract image dimensions for attachment {} : {} ", attachment.getFilename(),
                e.getMessage());
        return Optional.absent();
    }
}

From source file:com.github.rinde.rinsim.core.pdptw.RandomVehicle.java

public RandomVehicle(VehicleDTO dto, long seed) {
    super(dto);//from  ww  w.ja va  2  s  .c  o m
    rng = new MersenneTwister(seed);
    rm = Optional.absent();
    pm = Optional.absent();
    target = Optional.absent();
}

From source file:com.esha.dropwizard.shiro.BasicCredentialsAuthenticator.java

/**
 * {@inheritDoc}//from  w  ww.j a  v  a 2  s  . c  o m
 */
@Override
public Optional<Subject> authenticate(final BasicCredentials credentials) throws AuthenticationException {

    Optional<Subject> principal = Optional.absent();
    try {
        final Subject subject = SecurityUtils.getSubject();
        subject.login(new UsernamePasswordToken(credentials.getUsername(), credentials.getPassword()));
        principal = Optional.of(subject);
    } catch (final CredentialsException ce) {
        logger.debug("Invalid credentials", ce);
    } catch (final UnknownAccountException uae) {
        logger.debug("Unknown account", uae);
    } catch (final org.apache.shiro.authc.AuthenticationException ae) {
        logger.debug("Unspecified error", ae);
    } catch (final ShiroException se) {
        throw new AuthenticationException(se);
    }
    return principal;
}

From source file:com.google.devtools.build.xcode.xcodegen.Resources.java

public static Optional<String> languageOfLprojDir(Path child) {
    Path parent = child.getParent();
    if (parent == null) {
        return Optional.absent();
    }/*from  ww  w.  j  a va  2s  .  co m*/
    String dirName = parent.getFileName().toString();
    String lprojSuffix = ".lproj";
    if (dirName.endsWith(lprojSuffix)) {
        return Optional.of(dirName.substring(0, dirName.length() - lprojSuffix.length()));
    } else {
        return Optional.absent();
    }
}

From source file:com.facebook.presto.metadata.QualifiedTablePrefix.java

public QualifiedTablePrefix(String catalogName, String schemaName) {
    this.catalogName = checkCatalogName(catalogName);
    this.schemaName = Optional.of(checkSchemaName(schemaName));
    this.tableName = Optional.absent();
}

From source file:com.palantir.atlasdb.keyvalue.cassandra.jmx.CassandraJmxCompaction.java

public static Optional<CassandraJmxCompactionManager> createJmxCompactionManager(
        CassandraKeyValueServiceConfigManager configManager) {
    Preconditions.checkNotNull(configManager);
    CassandraKeyValueServiceConfig config = configManager.getConfig();
    CassandraJmxCompaction jmxCompaction = new CassandraJmxCompaction(config);

    Optional<CassandraJmxCompactionConfig> jmxConfig = config.jmx();
    // need to set the property before creating the JMX compaction client
    if (!jmxConfig.isPresent()) {
        log.info("Jmx compaction is not enabled.");
        return Optional.absent();
    }/*  www  . j  a  v  a 2  s.co m*/

    jmxCompaction.setJmxSslProperty(jmxConfig.get());
    ImmutableSet<CassandraJmxCompactionClient> clients = jmxCompaction.createCompactionClients(jmxConfig.get());
    ExecutorService exec = Executors.newFixedThreadPool(clients.size(),
            new ThreadFactoryBuilder().setNameFormat("Cassandra-Jmx-Compaction-ThreadPool-%d").build());

    return Optional.of(CassandraJmxCompactionManager.create(clients, exec));
}

From source file:com.eucalyptus.loadbalancing.dns.LoadBalancerDomainName.java

public static Optional<LoadBalancerDomainName> findMatching(final Name name) {
    for (final LoadBalancerDomainName domainName : values()) {
        if (domainName.apply(name)) {
            return Optional.of(domainName);
        }/*w  w  w . j  a  v a2  s  . co m*/
    }
    return Optional.absent();
}

From source file:gobblin.metrics.InnerMeter.java

InnerMeter(MetricContext context, String name, ContextAwareMeter contextAwareMeter) {
    this.name = name;

    Optional<MetricContext> parentContext = context.getParent();
    if (parentContext.isPresent()) {
        this.parentMeter = Optional.fromNullable(parentContext.get().contextAwareMeter(name));
    } else {//  w  w  w .  j a v  a 2  s  . c  om
        this.parentMeter = Optional.absent();
    }
    this.contextAwareMeter = new WeakReference<>(contextAwareMeter);
}

From source file:de.flapdoodle.java2pandoc.io.MavenSourceFileResolver.java

@Override
public Optional<Block> resolve(FileReference reference) {
    Optional<Block> ret = Optional.absent();

    for (Path searchPath : _searchPaths) {
        Path javaSourcePaths = _baseDirectory.resolve(searchPath).resolve(reference.path());
        if (Files.exists(javaSourcePaths)) {
            if (ret.isPresent()) {
                throw new IllegalArgumentException(
                        "Found " + reference + " in multiple paths(" + _searchPaths + ")");
            }// ww w.  j  a  v  a 2  s .c o  m
            ret = read(javaSourcePaths);
        }
    }

    return ret;
}