Example usage for com.google.common.base Optional transform

Introduction

In this page you can find the example usage for com.google.common.base Optional transform.

Prototype

public abstract <V> Optional<V> transform(Function<? super T, V> function);

Source Link

Document

If the instance is present, it is transformed with the given Function ; otherwise, Optional#absent is returned.

Usage

From source file:org.apache.gobblin.instrumented.Instrumented.java

/**
 * Returns a {@link com.codahale.metrics.Timer.Context} only if {@link org.apache.gobblin.metrics.MetricContext} is defined.
 * @param context an Optional&lt;{@link org.apache.gobblin.metrics.MetricContext}$gt;
 * @param name name of the timer./*from   w w  w . j a  v a  2 s . c o m*/
 * @return an Optional&lt;{@link com.codahale.metrics.Timer.Context}$gt;
 */
public static Optional<Timer.Context> timerContext(Optional<MetricContext> context, final String name) {
    return context.transform(new Function<MetricContext, Timer.Context>() {
        @Override
        public Timer.Context apply(@Nonnull MetricContext input) {
            return input.timer(name).time();
        }
    });
}

From source file:org.apache.gobblin.instrumented.Instrumented.java

/**
 * Updates a timer only if it is defined.
 * @param timer an Optional&lt;{@link com.codahale.metrics.Timer}&gt;
 * @param duration/* w ww .  jav  a2 s  .  c om*/
 * @param unit
 */
public static void updateTimer(Optional<Timer> timer, final long duration, final TimeUnit unit) {
    timer.transform(new Function<Timer, Timer>() {
        @Override
        public Timer apply(@Nonnull Timer input) {
            input.update(duration, unit);
            return input;
        }
    });
}

From source file:org.apache.aurora.scheduler.filter.ConstraintMatcher.java

/**
 * Gets the veto (if any) for a scheduling constraint based on the {@link AttributeAggregate} this
 * filter was created with./*from   w w  w .j a  va 2  s  .c  o m*/
 *
 * @param constraint Scheduling filter to check.
 * @return A veto if the constraint is not satisfied based on the existing state of the job.
 */
static Optional<Veto> getVeto(AttributeAggregate cachedjobState, Iterable<IAttribute> hostAttributes,
        IConstraint constraint) {

    Iterable<IAttribute> sameNameAttributes = Iterables.filter(hostAttributes,
            new NameFilter(constraint.getName()));
    Optional<IAttribute> attribute;
    if (Iterables.isEmpty(sameNameAttributes)) {
        attribute = Optional.absent();
    } else {
        Set<String> attributeValues = ImmutableSet
                .copyOf(Iterables.concat(Iterables.transform(sameNameAttributes, GET_VALUES)));
        attribute = Optional.of(IAttribute.build(new Attribute(constraint.getName(), attributeValues)));
    }

    ITaskConstraint taskConstraint = constraint.getConstraint();
    switch (taskConstraint.getSetField()) {
    case VALUE:
        boolean matches = AttributeFilter.matches(attribute.transform(GET_VALUES).or(ImmutableSet.of()),
                taskConstraint.getValue());
        return matches ? Optional.absent() : Optional.of(Veto.constraintMismatch(constraint.getName()));

    case LIMIT:
        if (!attribute.isPresent()) {
            return Optional.of(Veto.constraintMismatch(constraint.getName()));
        }

        boolean satisfied = AttributeFilter.matches(attribute.get(), taskConstraint.getLimit().getLimit(),
                cachedjobState);
        return satisfied ? Optional.absent() : Optional.of(Veto.unsatisfiedLimit(constraint.getName()));

    default:
        throw new SchedulerException(
                "Failed to recognize the constraint type: " + taskConstraint.getSetField());
    }
}

From source file:sparkjni.utils.SparkJni.java

@Builder.Factory
static SparkJni sparkJniSingleton(Optional<String> appName, String nativePath, Optional<String> jdkPath,
        final Optional<String> classpath) {
    if (sparkJniSingleton == null) {
        sparkJniSingleton = new SparkJni();
        sparkJniSingleton.initVars(appName.isPresent() ? appName.get() : null, nativePath,
                jdkPath.isPresent() ? jdkPath.get() : null);
        classpath.transform(new Function<String, Void>() {
            @Nullable//from w  w  w .  ja va2 s.com
            @Override
            public Void apply(@Nullable String s) {
                sparkJniSingleton.addToClasspath(s);
                return null;
            }
        });
    }
    return sparkJniSingleton;
}

From source file:com.eucalyptus.auth.euare.identity.region.RegionConfigurationManager.java

private static NonNullFunction<Region, RegionInfo> regionToRegionInfoTransform(
        final Optional<RegionConfiguration> regionConfigurationOptional) {
    return new NonNullFunction<Region, RegionInfo>() {
        @Nonnull/*from   www  . j av a  2 s  .c  om*/
        @Override
        public RegionInfo apply(final Region region) {
            return new RegionInfo(region.getName(), region.getIdentifierPartitions(),
                    Collections2.transform(region.getServices(),
                            TypeMappers.lookup(Service.class, RegionService.class)),
                    buildCidrs(regionConfigurationOptional
                            .transform(RegionConfigurationToCidrListTransform.REMOTE).orNull(),
                            region.getRemoteCidrs()),
                    buildCidrs(
                            regionConfigurationOptional
                                    .transform(RegionConfigurationToCidrListTransform.FORWARDED_FOR).orNull(),
                            region.getForwardedForCidrs()),
                    region.getCertificateFingerprintDigest(), region.getCertificateFingerprint(),
                    region.getSslCertificateFingerprintDigest(), region.getSslCertificateFingerprint());
        }
    };
}

From source file:com.facebook.buck.shell.ExportFileBuildRuleFactory.java

@Override
protected void amendBuilder(ExportFile.Builder builder, BuildRuleFactoryParams params)
        throws NoSuchBuildTargetException {
    Optional<String> src = params.getOptionalStringAttribute("src");
    builder.setSrc(src.transform(params.getResolveFilePathRelativeToBuildFileDirectoryTransform()));

    Optional<String> out = params.getOptionalStringAttribute("out");
    builder.setOut(out);//from  ww  w.  j av a2  s  . c om
}

From source file:de.zalando.hackweek.bpm.engine.impl.cassandra.db.handler.SelectHistoricTaskInstanceByIdHandler.java

@Override
public Object selectOne(final Session session, final Object parameter) {
    final String id = (String) parameter;
    final Optional<Row> optionalRow = fromNullable(session.execute(QUERY, id).one());
    return optionalRow.transform(HistoricTaskInstanceMapping.INSTANCE).orNull();
}

From source file:de.zalando.hackweek.bpm.engine.impl.cassandra.db.handler.SelectHistoricTaskInstanceEventByIdHandler.java

@Override
public Object selectOne(final Session session, final Object parameter) {
    final String id = (String) parameter;
    final Optional<Row> optionalRow = fromNullable(session.execute(QUERY, id).one());
    return optionalRow.transform(HistoricTaskInstanceEventMapping.INSTANCE).orNull();
}

From source file:org.glassfish.jersey.tests.integration.jersey2612.Resource.java

@Path("square")
@GET// www  . j a v  a 2 s  .c  o m
@Produces("text/plain")
public int echo(@QueryParam("value") final Optional<Integer> value) {
    return value.transform(new Function<Integer, Integer>() {
        @Override
        public Integer apply(final Integer integer) {
            return integer * integer;
        }
    }).or(0);
}

From source file:de.zalando.hackweek.bpm.engine.impl.cassandra.db.handler.SelectTaskByIdHandler.java

@Override
public Object selectOne(final Session session, final Object parameter) {
    final String id = (String) parameter;

    final Optional<Row> optionalResult = Optional.fromNullable(session.execute(QUERY, id).one());

    return optionalResult.transform(TaskMapping.INSTANCE).orNull();
}