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.impl.Blobs.java

public static Optional<String> getBlobAsString(BlobStore blobStore, String blobName) {
    Optional<byte[]> blob = getBlob(blobStore, blobName);
    Optional<String> str = Optional.absent();
    if (blob.isPresent()) {
        str = Optional.of(new String(blob.get(), Charsets.UTF_8));
    }// w w  w . j ava  2 s.c  o m
    return str;
}

From source file:com.github.radium226.common.Either.java

public static <L, R> Either<L, R> left(L left) {
    return new Either(Optional.of(left), Optional.absent());
}

From source file:org.apache.distributedlog.util.CommandLineUtils.java

public static Optional<String> getOptionalStringArg(CommandLine cmdline, String arg) {
    if (cmdline.hasOption(arg)) {
        return Optional.of(cmdline.getOptionValue(arg));
    } else {//from  w  w w.ja v  a 2s . c om
        return Optional.absent();
    }
}

From source file:com.google.caliper.platform.dalvik.DalvikModule.java

@Provides
@Singleton//  ww  w . ja v a  2s . c om
public static Optional<DalvikPlatform> provideOptionalPlatform() {
    if (System.getProperty("java.specification.name").equals("Dalvik Core Library")) {
        return Optional.of(new DalvikPlatform());
    } else {
        return Optional.absent();
    }
}

From source file:com.github.jeluard.guayaba.base.Optionals.java

/**
 * @param <T>/*from w  w w  . j a  v a  2  s . c  o  m*/
 * @param optional
 * @return an {@link Optional} returning encapsulated {@link Optional}
 */
public static <T> Optional<T> flatten(final Optional<Optional<T>> optional) {
    Preconditions.checkNotNull(optional, "null optional");

    if (!optional.isPresent()) {
        return Optional.absent();
    }

    return optional.get();
}

From source file:org.opendaylight.vpnservice.mdsalutil.MDSALDataStoreUtils.java

public static <T extends DataObject> Optional<T> read(final DataBroker broker,
        final LogicalDatastoreType datastoreType, InstanceIdentifier<T> path) {

    ReadOnlyTransaction tx = broker.newReadOnlyTransaction();

    Optional<T> result = Optional.absent();
    try {//from  w w w. j a v a  2  s.  com
        result = tx.read(datastoreType, path).get();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }

    return result;
}

From source file:org.onos.yangtools.yang.model.util.SchemaNodeUtils.java

public static final Optional<SchemaNode> getOriginalIfPossible(final SchemaNode node) {
    if (node instanceof DerivableSchemaNode) {
        @SuppressWarnings("unchecked")
        final Optional<SchemaNode> ret = (Optional<SchemaNode>) (((DerivableSchemaNode) node).getOriginal());
        return ret;
    }//from   w ww  .  jav  a2s  . c o m
    return Optional.absent();
}

From source file:de.flapdoodle.guava.Expectations.java

private static <T> Optional<T> intNoneOrOne(Iterator<T> iterator) {
    Preconditions.checkNotNull(iterator, "iterator is null");
    if (!iterator.hasNext()) {
        return Optional.absent();
    }//from ww w  .  j  a v  a  2  s .c  o m
    return Optional.of(iterator.next());
}

From source file:org.opendaylight.yangtools.yang.model.util.SchemaNodeUtils.java

public static Optional<SchemaNode> getOriginalIfPossible(final SchemaNode node) {
    if (node instanceof DerivableSchemaNode) {
        @SuppressWarnings("unchecked")
        final Optional<SchemaNode> ret = (Optional<SchemaNode>) (((DerivableSchemaNode) node).getOriginal());
        return ret;
    }//from ww  w  .  j  ava 2  s  .c o  m
    return Optional.absent();
}

From source file:org.opendaylight.yangtools.yang.data.impl.schema.tree.AbstractDataTreeCandidateNode.java

private static Optional<NormalizedNode<?, ?>> getChild(
        final NormalizedNodeContainer<?, PathArgument, NormalizedNode<?, ?>> container,
        final PathArgument identifier) {
    return container == null ? Optional.absent() : container.getChild(identifier);
}