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:alluxio.collections.NonUniqueFieldIndex.java

@Override
public T getFirst(Object value) {
    Set<T> all = mIndexMap.get(value);
    return all == null ? null : Iterables.getFirst(all, null);
}

From source file:org.jpmml.evaluator.MatrixUtil.java

static private Number getMatCellValue(List<MatCell> matCells, final int row, final int column) {
    Predicate<MatCell> filter = new Predicate<MatCell>() {

        @Override/*w w w  .jav a 2  s.c  o  m*/
        public boolean apply(MatCell matCell) {
            return (getRow(matCell) == row) && (getColumn(matCell) == column);
        }
    };

    MatCell matCell = Iterables.getFirst(Iterables.filter(matCells, filter), null);
    if (matCell != null) {
        String value = matCell.getValue();

        return Double.valueOf(value);
    }

    return null;
}

From source file:org.jclouds.vcloud.director.v1_5.domain.dmtf.Envelope.java

public VirtualSystem getVirtualSystem() {
    if (virtualSystem != null) {
        return virtualSystem;
    } else if (virtualSystemCollection == null || virtualSystemCollection.getVirtualSystems() == null) {
        return null;
    } else {/*from w  w  w  .  j av  a2  s  . c  o  m*/
        return Iterables.getFirst(virtualSystemCollection.getVirtualSystems(), null);
    }
}

From source file:org.javabits.yar.guice.CacheContainer.java

@Nullable
@Override
public V getFirst(Type key) {
    return Iterables.getFirst(getAll(key), null);
}

From source file:com.google.security.zynamics.binnavi.debug.helpers.EchoBreakpointCollector.java

@Override
public IterationMode next(final NaviNode node) {
    final INaviViewNode viewNode = node.getRawNode();
    if (viewNode instanceof INaviCodeNode) {
        final INaviCodeNode codeNode = (INaviCodeNode) viewNode;
        final INaviInstruction instruction = Iterables.getFirst(codeNode.getInstructions(), null);
        final INaviModule module = instruction.getModule();
        final BreakpointAddress address = new BreakpointAddress(module,
                new UnrelocatedAddress(instruction.getAddress()));
        if (isBlocked(manager, address)) {
            return IterationMode.CONTINUE;
        }// w  w  w . ja v a2 s .c  o m
        NaviLogger.info("Adding Echo breakpoint %s to the active list",
                address.getAddress().getAddress().toHexString());

        // Add the echo breakpoint to the list of active echo breakpoints
        echoBreakpointAbleAddresses.add(address);
    } else if (viewNode instanceof INaviFunctionNode) {
        final INaviFunctionNode functionNode = (INaviFunctionNode) viewNode;
        final INaviModule module = functionNode.getFunction().getModule();
        final BreakpointAddress address = new BreakpointAddress(module,
                new UnrelocatedAddress(functionNode.getFunction().getAddress()));
        if (isBlocked(manager, address)) {
            return IterationMode.CONTINUE;
        }
        NaviLogger.info("Adding Echo breakpoint %s to the active list",
                address.getAddress().getAddress().toHexString());

        // Add the echo breakpoint to the list of active echo breakpoints
        echoBreakpointAbleAddresses.add(address);
    }
    return IterationMode.CONTINUE;
}

From source file:com.palantir.typescript.TypeScriptProjects.java

public static IContainer getOutputFolder(IProject project) {
    checkNotNull(project);/*from   w  ww . j  a  v  a 2  s .  c  o  m*/

    return Iterables.getFirst(getFoldersFromPreference(project, IPreferenceConstants.COMPILER_OUT_DIR), null);
}

From source file:org.apache.beam.runners.spark.translation.SparkKeyedCombineFn.java

/**
 * Implements Spark's createCombiner function in:
 * <p>//from   www .  j  a  v a 2 s .com
 * {@link org.apache.spark.rdd.PairRDDFunctions#combineByKey}.
 * </p>
 */
Iterable<WindowedValue<KV<K, AccumT>>> createCombiner(WindowedValue<KV<K, InputT>> wkvi) {
    // sort exploded inputs.
    Iterable<WindowedValue<KV<K, InputT>>> sortedInputs = sortByWindows(wkvi.explodeWindows());

    TimestampCombiner timestampCombiner = windowingStrategy.getTimestampCombiner();
    WindowFn<?, BoundedWindow> windowFn = windowingStrategy.getWindowFn();

    //--- inputs iterator, by window order.
    final Iterator<WindowedValue<KV<K, InputT>>> iterator = sortedInputs.iterator();
    WindowedValue<KV<K, InputT>> currentInput = iterator.next();
    BoundedWindow currentWindow = Iterables.getFirst(currentInput.getWindows(), null);

    // first create the accumulator and accumulate first input.
    K key = currentInput.getValue().getKey();
    AccumT accumulator = combineFn.createAccumulator(ctxtForInput(currentInput));
    accumulator = combineFn.addInput(accumulator, currentInput.getValue().getValue(),
            ctxtForInput(currentInput));

    // keep track of the timestamps assigned by the TimestampCombiner.
    Instant windowTimestamp = timestampCombiner.assign(currentWindow,
            windowingStrategy.getWindowFn().getOutputTime(currentInput.getTimestamp(), currentWindow));

    // accumulate the next windows, or output.
    List<WindowedValue<KV<K, AccumT>>> output = Lists.newArrayList();

    // if merging, merge overlapping windows, e.g. Sessions.
    final boolean merging = !windowingStrategy.getWindowFn().isNonMerging();

    while (iterator.hasNext()) {
        WindowedValue<KV<K, InputT>> nextValue = iterator.next();
        BoundedWindow nextWindow = Iterables.getOnlyElement(nextValue.getWindows());

        boolean mergingAndIntersecting = merging
                && isIntersecting((IntervalWindow) currentWindow, (IntervalWindow) nextWindow);

        if (mergingAndIntersecting || nextWindow.equals(currentWindow)) {
            if (mergingAndIntersecting) {
                // merge intersecting windows.
                currentWindow = merge((IntervalWindow) currentWindow, (IntervalWindow) nextWindow);
            }
            // keep accumulating and carry on ;-)
            accumulator = combineFn.addInput(accumulator, nextValue.getValue().getValue(),
                    ctxtForInput(nextValue));
            windowTimestamp = timestampCombiner.combine(windowTimestamp, timestampCombiner.assign(currentWindow,
                    windowFn.getOutputTime(nextValue.getTimestamp(), currentWindow)));
        } else {
            // moving to the next window, first add the current accumulation to output
            // and initialize the accumulator.
            output.add(WindowedValue.of(KV.of(key, accumulator), windowTimestamp, currentWindow,
                    PaneInfo.NO_FIRING));
            // re-init accumulator, window and timestamp.
            accumulator = combineFn.createAccumulator(ctxtForInput(nextValue));
            accumulator = combineFn.addInput(accumulator, nextValue.getValue().getValue(),
                    ctxtForInput(nextValue));
            currentWindow = nextWindow;
            windowTimestamp = timestampCombiner.assign(currentWindow,
                    windowFn.getOutputTime(nextValue.getTimestamp(), currentWindow));
        }
    }

    // add last accumulator to the output.
    output.add(WindowedValue.of(KV.of(key, accumulator), windowTimestamp, currentWindow, PaneInfo.NO_FIRING));

    return output;
}

From source file:org.obm.satellite.client.ConnectionImpl.java

@Override
public void updateIMAPServer() throws SatteliteClientException, ConnectionException {
    if (!configuration.isIMAPServerManaged()) {
        return;/*  w  ww . j a v a  2  s  . com*/
    }

    ObmHost imapHost = Iterables.getFirst(domain.getHosts().get(ServiceProperty.IMAP), null);

    if (imapHost == null) {
        throw new SatteliteClientException(
                String.format("Domain %s doesn't have a linked mail/imap host", domain.getName()));
    }

    post(imapHost.getName(), imapHost.getIp(), SATELLITE_IMAP_PATH);
}

From source file:com.opengamma.integration.viewer.status.impl.SimpleViewStatusModel.java

@Override
public int getColumnCount() {
    return Iterables.getFirst(_columnHeaders, Lists.newArrayList()).size();
}

From source file:org.opendaylight.controller.config.yangjmxgenerator.plugin.gofactory.AbsModuleGeneratedObjectFactory.java

public GeneratedObject toGeneratedObject(ModuleMXBeanEntry mbe, Optional<String> copyright) {
    FullyQualifiedName abstractFQN = new FullyQualifiedName(mbe.getPackageName(), mbe.getAbstractModuleName());
    Optional<String> classJavaDoc = Optional.fromNullable(mbe.getNullableDescription());
    AbstractModuleTemplate abstractModuleTemplate = TemplateFactory.abstractModuleTemplateFromMbe(mbe);
    Optional<String> header = abstractModuleTemplate.getHeaderString();

    List<FullyQualifiedName> implementedInterfaces = Lists.transform(
            abstractModuleTemplate.getTypeDeclaration().getImplemented(), FULLY_QUALIFIED_NAME_FUNCTION);

    Optional<FullyQualifiedName> extended = Optional.fromNullable(Iterables.getFirst(Collections2.transform(
            abstractModuleTemplate.getTypeDeclaration().getExtended(), FULLY_QUALIFIED_NAME_FUNCTION), null));

    Optional<FullyQualifiedName> maybeRegistratorType;
    if (abstractModuleTemplate.isRuntime()) {
        maybeRegistratorType = Optional
                .of(FullyQualifiedName.fromString(abstractModuleTemplate.getRegistratorType()));
    } else {//from  ww  w. j a  v  a  2s.  c om
        maybeRegistratorType = Optional.absent();
    }

    return toGeneratedObject(abstractFQN, copyright, header, classJavaDoc, extended, implementedInterfaces,
            abstractModuleTemplate.getModuleFields(), maybeRegistratorType, abstractModuleTemplate.getMethods(),
            mbe.getYangModuleQName());
}