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.arpnetworking.tsdcore.tailer.NoPositionStore.java

/**
 * {@inheritDoc}
 */
@Override
public Optional<Long> getPosition(final String identifier) {
    return Optional.absent();
}

From source file:org.eclipse.recommenders.codesearch.rcp.index.indexer.utils.IndexInformationCache.java

@Override
public Optional<Long> getLastIndexed(final File location) {
    if (cache.containsKey(location)) {
        return Optional.of(cache.get(location));
    }/*from  w w w  .j  a  v  a2  s  . c o  m*/

    return Optional.absent();
}

From source file:org.eclipse.buildship.core.util.file.FileUtils.java

/**
 * Derives a {@code File} instance with absolute path from the specified path.
 *
 * @param path the relative or absolute path of the {@code File} instance to derive
 * @return the absolute {@code File} if the path is not {@code null} or empty, otherwise
 * {@link Optional#absent()}/* w w  w . j a v  a 2 s.  c o m*/
 */
public static Optional<File> getAbsoluteFile(String path) {
    if (Strings.isNullOrEmpty(path)) {
        return Optional.absent();
    } else {
        return Optional.of(new File(path.trim()).getAbsoluteFile());
    }
}

From source file:com.aegiswallet.widgets.AegisTypeface.java

public static Optional<Typeface> createTypeface(TextView widget, Optional<Font> option) {
    if (widget.isInEditMode()) {
        return Optional.absent();
    }/*from w  w  w  .  j  a va  2 s . c om*/
    synchronized (TYPEFACES) {
        Font font = option.or(Font.regular);
        Typeface typeface = TYPEFACES.get(font);
        if (typeface == null) {
            typeface = Typeface.createFromAsset(widget.getContext().getAssets(), getAssetPath(font));
            TYPEFACES.put(font, typeface);
        }
        // This is never null at runtime, but roboelectric cannot create typefaces so it is null during tests
        return Optional.fromNullable(typeface);
    }
}

From source file:org.opendaylight.controller.md.sal.binding.spi.AdapterLoader.java

@Override
public Optional<T> load(final Class<? extends T> key) {

    final AdapterBuilder<? extends T, D> builder = createBuilder(key);
    for (final Class<? extends D> reqDeleg : builder.getRequiredDelegates()) {
        final D deleg = getDelegate(reqDeleg);
        if (deleg != null) {
            builder.addDelegate(reqDeleg, deleg);
        } else {/* w  w w.  j a  va 2  s . com*/
            return Optional.absent();
        }
    }
    return Optional.<T>of(builder.build());
}

From source file:org.mayocat.jackson.OptionalStringDeserializer.java

@Override
public Optional<String> deserialize(JsonParser jsonParser, DeserializationContext deserializationContext)
        throws IOException, JsonProcessingException {
    if (Strings.isNullOrEmpty(jsonParser.getValueAsString())) {
        return Optional.absent();
    }//from  ww w .j  a  v  a  2  s . co m
    return Optional.fromNullable(jsonParser.getValueAsString());
}

From source file:org.eclipse.emf.ecoretools.design.service.DiagnosticAttachment.java

public static Optional<Diagnostic> get(EObject cur) {
    DiagnosticAttachment found = getAttachment(cur);
    if (found != null) {
        return Optional.fromNullable(found.getDiagnostic());
    }// w  w w  . j  a va 2  s.  com
    return Optional.absent();
}

From source file:org.opendaylight.controller.config.yang.store.impl.YangStoreActivator.java

@Override
public void start(BundleContext context) throws Exception {
    // get blacklist
    Optional<Pattern> maybeBlacklistPattern = Optional.absent();
    String blacklist = context.getProperty("yangstore.blacklist");
    if (blacklist != null) {
        try {//w w w  .ja  v  a2 s .c  o m
            maybeBlacklistPattern = Optional.of(Pattern.compile(blacklist));
        } catch (RuntimeException e) {
            logger.error("Cannot parse blacklist regex " + blacklist, e);
            throw e;
        }
    }
    ExtenderYangTracker extenderYangTracker = new ExtenderYangTracker(maybeBlacklistPattern, context);
    Dictionary<String, ?> properties = new Hashtable<>();
    context.registerService(YangStoreService.class, extenderYangTracker, properties);
}

From source file:extrabiomes.Module.java

public static void releaseStaticResources() {
    eventBus = Optional.absent();
}

From source file:de.flapdoodle.javaparser.parboiled.helper.EmptyParameter.java

@Override
protected Optional<Parameter> asParameter() {
    return Optional.absent();
}