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:si.arnes.dropbookmarks.auth.HelloAuthenticator.java

@Override
public Optional<User> authenticate(BasicCredentials credentials) throws AuthenticationException {
    if (password.equals(credentials.getPassword())) {
        return Optional.of(new User(0, credentials.getUsername(), credentials.getPassword()));
    }/*from   ww  w  . ja  v  a 2 s. co  m*/
    return Optional.absent();
}

From source file:org.opendaylight.controller.cluster.datastore.utils.MockConfiguration.java

@Override
public Optional<String> getModuleNameFromNameSpace(final String nameSpace) {
    return Optional.absent();
}

From source file:com.android.camera.data.SessionItem.java

/**
 * Creates a new session from the given URI.
 * @param context valid android application context.
 * @param uri the URI of the session.//ww w. j  a v a  2s  . c  om
 * @return If the session was found, a new SessionItem is returned.
 */
public static Optional<SessionItem> create(Context context, Uri uri) {
    if (!Storage.containsPlaceholderSize(uri)) {
        return Optional.absent();
    }
    Size dimension = getSessionSize(uri);
    if (dimension == null) {
        return Optional.absent();
    }
    return Optional.of(new SessionItem(context, uri, dimension));
}

From source file:org.zalando.stups.oauth2.spring.client.AccessTokenUtils.java

public static Optional<String> getAccessTokenFromSecurityContext() {
    SecurityContext securityContext = SecurityContextHolder.getContext();

    Authentication authentication = securityContext.getAuthentication();
    if (authentication instanceof OAuth2Authentication) {
        Object userDetails = ((OAuth2Authentication) authentication).getUserAuthentication().getDetails();
        if (userDetails != null) {
            try {
                final Map details = (Map) userDetails;
                return Optional.fromNullable((String) details.get(ACCESS_TOKEN));
            } catch (ClassCastException e) {

                return Optional.absent();
            }/*from   w ww . j a va 2s .c o  m*/
        } else {

            return Optional.absent();
        }
    }

    return Optional.absent();
}

From source file:bear.task.TaskResult.java

public static <T extends TaskResult<?>> Optional<T> okOrAbsent(@Nonnull Optional<T> result) {
    Preconditions.checkNotNull(result);/*  w w w.  j  a  v  a2 s. com*/

    if (!result.isPresent() || !result.get().ok())
        return Optional.absent();

    return result;
}

From source file:org.gradle.api.reporting.model.internal.BareStringNodeDescriptor.java

@Override
public Optional<String> value(ModelNode modelNode) {
    return Optional.absent();
}

From source file:net.pterodactylus.sonitus.io.FlacIdentifier.java

/**
 * Tries to identify the FLAC file contained in the given stream.
 *
 * @param inputStream/*from  ww  w . j a  va2s  . c om*/
 *       The input stream
 * @return The identified metadata, or {@link Optional#absent()} if the
 *         metadata can not be identified
 * @throws IOException
 *       if an I/O error occurs
 */
public static Optional<Metadata> identify(InputStream inputStream) throws IOException {
    Optional<Stream> stream = Stream.parse(inputStream);
    if (!stream.isPresent()) {
        return Optional.absent();
    }

    List<MetadataBlock> streamInfos = stream.get().metadataBlocks(STREAMINFO);
    if (streamInfos.isEmpty()) {
        /* FLAC file without STREAMINFO is invalid. */
        return Optional.absent();
    }

    MetadataBlock streamInfoBlock = streamInfos.get(0);
    StreamInfo streamInfo = (StreamInfo) streamInfoBlock.data();

    return Optional
            .of(new Metadata(new FormatMetadata(streamInfo.numberOfChannels(), streamInfo.sampleRate(), "FLAC"),
                    new ContentMetadata()));
}

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

@Override
public Optional<String> mapAttribute(Object value) {
    if (value == null) {
        return Optional.absent();
    }// www.j a v a 2 s .c o  m

    String expectedClass = getOpenType().getTypeName();
    return Optional.of(enumResolver.toYang(expectedClass, value.toString()));
}

From source file:org.opendaylight.controller.config.util.capability.BasicCapability.java

@Override
public Optional<String> getModuleName() {
    return Optional.absent();
}

From source file:com.dangdang.ddframe.rdb.sharding.parser.jaxb.OptionalAdapter.java

@Override
public Optional<Integer> unmarshal(final String v) throws Exception {
    if (Strings.isNullOrEmpty(v)) {
        return Optional.absent();
    }/*from  w w w  . j a v  a 2 s. c  o m*/
    return Optional.of(Integer.valueOf(v));
}