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

Introduction

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

Prototype

@Nullable
public static <T> T getFirst(Iterable<? extends T> iterable, @Nullable T defaultValue)

Source Link

Document

Returns the first element in iterable or defaultValue if the iterable is empty.

Usage

From source file:org.apache.metron.enrichment.bolt.HBaseBolt.java

public static String zkConnectStringToHosts(String connString) {
    Iterable<String> hostPortPairs = Splitter.on(',').split(connString);
    return Joiner.on(',').join(Iterables.transform(hostPortPairs, new Function<String, String>() {

        @Override/*from w  w w.jav a2  s .  co m*/
        public String apply(String hostPortPair) {
            return Iterables.getFirst(Splitter.on(':').split(hostPortPair), "");
        }
    }));
}

From source file:brooklyn.example.ExampleForwardingEntityImpl.java

@Override
protected void preStart() {
    super.preStart();
    Entity originEntity = getConfig(ORIGIN_ENTITY_FORWARDED);
    AttributeSensor<Integer> originPortAttribute = getConfig(ORIGIN_PORT_ATTRIBUTE_FORWARDED);

    try {//from  ww  w .  j a va2 s  . co  m
        // wait for the target DB to be available
        String url = Tasks.resolveValue(
                DependentConfiguration.attributeWhenReady(originEntity, Attributes.SERVICE_UP), String.class,
                getExecutionContext());
        log.info("burst node " + this + " detected target DB available at " + url);

        Integer originPort = originEntity.getAttribute(originPortAttribute);
        SshMachineLocation fakeDb = (SshMachineLocation) getMachineOrNull();
        SshMachineLocation realDb = (SshMachineLocation) Iterables
                .getFirst(((EntityLocal) originEntity).getLocations(), null);
        String originPublicKeyData = originEntity.getAttribute(PUBLIC_KEY_DATA);

        if (originPublicKeyData == null) {
            synchronized (realDb) {
                originPublicKeyData = SshTunnelling.generateRsaKey(realDb);
                ((EntityLocal) originEntity).setAttribute(PUBLIC_KEY_DATA, originPublicKeyData);
            }
        }

        SshTunnelling.authorizePublicKey(fakeDb, originPublicKeyData);

        SshTunnelling.openRemoteForwardingTunnel(realDb, fakeDb,
                // on real (initiator/host) side
                "localhost", originPort,
                // on fake (target/new) side
                "localhost", originPort);

    } catch (Exception e) {
        log.warn("Unable to start DB forwarding from " + originEntity + " to " + this + ": " + e);
        log.debug("Unable to start DB forwarding from " + originEntity + " to " + this + ": " + e, e);
        Exceptions.propagateIfFatal(e);
    }

    // after this method (preStart) it otherwise acts as normal...
}

From source file:org.obm.dbcp.MultiNodeDatabaseDriverConfigurationProvider.java

@Inject
@VisibleForTesting//from ww w. ja v a2  s .  c  om
MultiNodeDatabaseDriverConfigurationProvider(Set<DatabaseDriverConfiguration> drivers,
        MultiNodeDatabaseConfiguration databaseConfigurations) {
    super(drivers, Iterables.getFirst(databaseConfigurations.getDatabaseConfigurations().values(), null));
}

From source file:fr.mtlx.odm.model.Person.java

public String getFirstTelephoneNumber() {
    if (telephoneNumber != null)
        return Iterables.getFirst(telephoneNumber, null);

    return null;
}

From source file:net.freifunk.autodeploy.firmware.FirmwareServiceImpl.java

@Override
public Firmware findSupportedFirmware(final String firmwareString) {
    final Iterable<Firmware> matches = Iterables.filter(_configurators.keySet(), new Predicate<Firmware>() {

        @Override// ww w .j  a v a  2s  .c om
        public boolean apply(final Firmware firmware) {
            return firmware != null && firmware.getName().equals(firmwareString);
        }
    });

    if (Iterables.size(matches) > 1) {
        throw new IllegalStateException("More than one firmware found: " + firmwareString);
    }
    return Iterables.getFirst(matches, null);
}

From source file:io.jenkins.blueocean.service.embedded.UserStatePreloader.java

/**
 * {@inheritDoc}//from   www  .  j a  va  2  s  . com
 */
@Override
public String getStateJson() {

    BlueOrganization organization = Iterables.getFirst(OrganizationFactory.getInstance().list(), null);

    try {
        User currentUser = User.current();
        if (currentUser != null && organization != null) {
            return Export.toJson(new UserImpl(organization, currentUser));
        } else {
            return ANONYMOUS;
        }
    } catch (IOException e) {
        LOGGER.log(Level.SEVERE,
                "Unexpected error serializing active User object and adding to page preload state.");
        return ANONYMOUS;
    }
}

From source file:com.google.devtools.build.lib.skyframe.PackageProgressReceiver.java

/**
 * Return the ordered pair of a consistent snapshot of the state, consisting of a human-readable
 * description of the progress achieved so far and a human readable description of the currently
 * running activities. The later always include the oldest loading package not finished loading.
 *//*  w  ww . j a  v  a 2s  .  co m*/
public synchronized Pair<String, String> progressState() {
    String progress = "" + packagesCompleted + " packages loaded";
    StringBuffer activity = new StringBuffer();
    if (pendingSet.size() > 0) {
        activity.append("currently loading: ").append(Iterables.getFirst(pendingSet, null).toString());
        if (pendingSet.size() > 1) {
            activity.append(" ... (" + pendingSet.size() + " packages)");
        }
    }
    return new Pair<String, String>(progress, activity.toString());
}

From source file:org.gradle.integtests.fixtures.AvailableJavaHomes.java

public static JavaInfo getAvailableJdk(final Spec<? super JvmInstallation> filter) {
    return Iterables.getFirst(getAvailableJdks(filter), null);
}

From source file:com.google.idea.blaze.base.run.rulefinder.RuleFinder.java

@Nullable
private RuleIdeInfo findRule(Project project, Predicate<RuleIdeInfo> predicate) {
    List<RuleIdeInfo> results = findRules(project, predicate);
    assert results.size() <= 1;
    return Iterables.getFirst(results, null);
}

From source file:com.google.devtools.build.lib.server.RPCService.java

/**
 * Executes the request; returns Unix like return codes (0 means success). May
 * also throw arbitrary exceptions./*w  w w.j a  v a 2 s .  c  o m*/
 */
public int executeRequest(List<String> request, OutErr outErr, long firstContactTime) throws Exception {
    if (shutdown != ShutdownMethod.NONE) {
        throw new IllegalStateException("Received request after shutdown.");
    }
    String command = Iterables.getFirst(request, "");
    if (appCommand != null && command.equals("blaze")) { // an application request
        // Blocking is done in the client for AF_UNIX communications, so if blockForLock would block,
        // something went wrong
        int result = appCommand.exec(request.subList(1, request.size()), outErr, LockingMode.ERROR_OUT,
                "AF_UNIX client", firstContactTime);
        ShutdownMethod commandShutdown = appCommand.shutdown();
        if (commandShutdown != ShutdownMethod.NONE) { // an application shutdown request
            shutdown(commandShutdown);
        }
        return result;
    } else {
        throw new UnknownCommandException(command);
    }
}