Example usage for com.google.common.collect Iterables getOnlyElement

Introduction

In this page you can find the example usage for com.google.common.collect Iterables getOnlyElement.

Prototype

public static <T> T getOnlyElement(Iterable<T> iterable)

Source Link

Document

Returns the single element contained in iterable .

Usage

From source file:com.opengamma.engine.marketdata.manipulator.NodeExtractor.java

protected static String getOptionalProperty(final ValueSpecification spec, final String propertyName) {
    final ValueProperties properties = spec.getProperties();
    final Set<String> curves = properties.getValues(propertyName);
    if (curves != null && !curves.isEmpty()) {
        return Iterables.getOnlyElement(curves);
    } else {/*from   w  w  w.  j av a  2s . c  o  m*/
        return null;
    }
}

From source file:org.apache.provisionr.cloudstack.core.Networks.java

/**
 * Returns the first network with the given name.
 *
 * @throws NoSuchElementException   if no network is found
 * @throws IllegalArgumentException if more networks with the same name are found
 *//*from  ww w  .  ja va 2s . co  m*/
public static Network getByName(CloudStackClient client, final String networkName) {
    Set<Network> networks = Sets.filter(client.getNetworkClient().listNetworks(), new Predicate<Network>() {
        @Override
        public boolean apply(Network network) {
            return network != null && network.getName().equals(networkName);
        }
    });

    return Iterables.getOnlyElement(networks);
}

From source file:com.google.auto.factory.processor.AnnotationValues.java

static TypeElement asType(AnnotationValue value) {
    return value.accept(new SimpleAnnotationValueVisitor6<TypeElement, Void>() {
        @Override//from ww w.j  a v  a  2 s  .c om
        protected TypeElement defaultAction(Object o, Void p) {
            throw new IllegalArgumentException();
        }

        @Override
        public TypeElement visitType(TypeMirror t, Void p) {
            return t.accept(new SimpleTypeVisitor6<TypeElement, Void>() {
                @Override
                protected TypeElement defaultAction(TypeMirror e, Void p) {
                    throw new AssertionError();
                }

                @Override
                public TypeElement visitDeclared(DeclaredType t, Void p) {
                    return Iterables.getOnlyElement(ElementFilter.typesIn(ImmutableList.of(t.asElement())));
                }
            }, null);
        }
    }, null);
}

From source file:grakn.core.graql.reasoner.atom.predicate.NeqIdPredicate.java

private static Variable extractPredicateVariable(Statement pattern) {
    return Iterables.getOnlyElement(pattern.getProperties(NeqProperty.class).collect(Collectors.toSet()))
            .statement().var();
}

From source file:org.apache.brooklyn.core.mgmt.rebind.transformer.CompoundTransformerLoader.java

public static CompoundTransformer load(String contents) {
    CompoundTransformer.Builder builder = CompoundTransformer.builder();
    Iterable<Object> toplevel = Yamls.parseAll(contents);
    Collection<?> rules = (Collection<?>) Iterables.getOnlyElement(toplevel);
    for (Object obj : rules) {
        Map<?, ?> map = (Map<?, ?>) obj;
        Entry<?, ?> entry = Iterables.getOnlyElement(map.entrySet());
        addRule(builder, (String) entry.getKey(), (Map<?, ?>) entry.getValue());
    }/*from   w  ww .  j ava 2 s.c o m*/
    LOG.info("Loaded " + rules.size() + " transforms");
    return builder.build();
}

From source file:org.apache.whirr.service.hadoop.HadoopCluster.java

private static Instance getJobTracker(Cluster cluster) {
    Set<Instance> jobtracker = cluster
            .getInstancesMatching(RolePredicates.role(HadoopJobTrackerClusterActionHandler.ROLE));
    if (jobtracker.isEmpty()) {
        return null;
    }// w w w.  j  a  v  a  2 s .  co m
    return Iterables.getOnlyElement(jobtracker);
}

From source file:sklearn.ensemble.gradient_boosting.QuantileEstimator.java

public Number getDefaultValue() {
    return Iterables.getOnlyElement(getQuantile());
}

From source file:org.apache.beam.sdk.extensions.sql.utils.RowAsserts.java

/** Asserts result contains single row with a double field. */
public static SerializableFunction<Iterable<Row>, Void> matchesScalar(double expected, double delta) {

    return input -> {
        Row row = Iterables.getOnlyElement(input);
        assertNotNull(row);//from   w  ww. java2s .  co m
        assertEquals(expected, row.getDouble(0), delta);
        return null;
    };
}

From source file:sklearn.ensemble.gradient_boosting.MeanEstimator.java

@Override
public Number getDefaultValue() {
    return Iterables.getOnlyElement(getMean());
}

From source file:org.jclouds.functions.OnlyElementOrNull.java

@Override
public T apply(Iterable<T> arg0) {
    if (arg0 == null || Iterables.size(arg0) == 0)
        return null;
    return Iterables.getOnlyElement(arg0);
}