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.voxelplugineering.voxelsniper.service.persistence.JsonDataSourceReader.java

/**
 * A {@link DataSourceBuilder} for json data sources.
 *//*from ww  w .  j a  va 2 s .  c  o m*/
public static final DataSourceBuilder<JsonDataSourceReader> getBuilder(final DataSourceFactory factory) {
    return new DataSourceBuilder<JsonDataSourceReader>() {

        @Override
        public Optional<JsonDataSourceReader> build(DataContainer args) {
            if (!args.containsKey("source") || !args.containsKey("sourceArgs")) {
                GunsmithLogger.getLogger().warn("Failed to build JsonDataSourceReader, invalid args");
                return Optional.absent();
            }
            String sourceName = args.getString("source").get();
            Optional<DataSource> source = factory.build(sourceName, args.getContainer("sourceArgs").get());
            if (!source.isPresent()) {
                GunsmithLogger.getLogger().warn("Failed to build data source for JsonDataSourceReader");
                return Optional.absent();
            }
            if (!StreamDataSource.class.isAssignableFrom(source.get().getClass())) {
                GunsmithLogger.getLogger()
                        .warn("Failed to build JsonDataSourceReader: Source was not a StreamDataSource");
                return Optional.absent();
            }
            StreamDataSource stream = (StreamDataSource) source.get();
            return Optional.of(new JsonDataSourceReader(stream));
        }

    };
}

From source file:dagger2.internal.codegen.Binding.java

static Optional<String> bindingPackageFor(Iterable<? extends Binding> bindings) {
    ImmutableSet.Builder<String> bindingPackagesBuilder = ImmutableSet.builder();
    for (Binding binding : bindings) {
        bindingPackagesBuilder.addAll(binding.bindingPackage().asSet());
    }//from   w  w w . j  a va2s  . c  om
    ImmutableSet<String> bindingPackages = bindingPackagesBuilder.build();
    switch (bindingPackages.size()) {
    case 0:
        return Optional.absent();
    case 1:
        return Optional.of(bindingPackages.iterator().next());
    default:
        throw new IllegalArgumentException();
    }
}

From source file:org.anhonesteffort.flock.registration.model.FlockCardInformation.java

public static Optional<FlockCardInformation> build(Bundle bundledCardInformation) {
    if (bundledCardInformation == null || bundledCardInformation.getString(KEY_ACCOUNT_ID) == null)
        return Optional.absent();

    return Optional.of(new FlockCardInformation(bundledCardInformation.getString(KEY_ACCOUNT_ID),
            bundledCardInformation.getString(KEY_LAST_FOUR), bundledCardInformation.getString(KEY_EXPIRATION)));
}

From source file:dattln.auth.LdapAuthenticator.java

public Optional<User> authenticate(BasicCredentials basicCredentials) throws AuthenticationException {
    if (delegatingAuthenticator.authenticate(basicCredentials)) {
        return Optional.of(new User(basicCredentials.getUsername()));
    }/*from  w  w  w. ja v  a 2 s  .co m*/
    return Optional.absent();
}

From source file:net.diogobohm.timed.api.ui.domain.TaskList.java

public Optional<Task> getLastOpenTask() {
    Task lastTask = taskList.getLast();//from  w w w . j  a v  a2 s.  c  om

    if (lastTask.getFinish().isPresent()) {
        return Optional.absent();
    }

    return Optional.of(lastTask);
}

From source file:org.locationtech.geogig.osm.internal.log.ReadOSMFilterFile.java

@Override
protected Optional<String> _call() {
    Preconditions.checkNotNull(entry);/*from www .  java  2  s . 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:com.facebook.buck.cxx.AbstractCxxHeadersDir.java

@Override
public Optional<SourcePath> getHeaderMap() {
    return Optional.absent();
}

From source file:eu.cloudwave.wp5.feedback.eclipse.base.infrastructure.config.ConfigLoaderImpl.java

/**
 * {@inheritDoc}/*from  w w w .  j a v a  2  s  .c  o  m*/
 */
@Override
public Optional<String> get(final String path, final String key) {
    final Properties properties = new Properties();
    final InputStream fileInputStream = getClass().getClassLoader().getResourceAsStream(path);
    try {
        properties.load(fileInputStream);
    } catch (final IOException e) {
        return Optional.absent();
    }
    return Optional.fromNullable(properties.getProperty(key));
}

From source file:org.locationtech.geogig.osm.internal.log.ReadOSMMapping.java

@Override
protected Optional<Mapping> _call() {
    Preconditions.checkNotNull(entry);//from   w ww.  java2  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.jclouds.digitalocean2.handlers.DigitalOcean2RateLimitRetryHandler.java

@Override
protected Optional<Long> millisToNextAvailableRequest(HttpCommand command, HttpResponse response) {
    // The header is the Unix epoch time when the next request can be done
    String epochForNextAvailableRequest = response.getFirstHeaderOrNull("RateLimit-Reset");
    if (epochForNextAvailableRequest == null) {
        return Optional.absent();
    }//  w  w w. j  a  v  a2 s  .  c o  m
    return Optional.of(millisUntilNextAvailableRequest(Long.parseLong(epochForNextAvailableRequest)));
}