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:com.eviware.loadui.integration.LoadUIUtils.java

public static List<SceneItem> getTestCases(WorkspaceProvider workspaceProvider) {
    Collection<? extends ProjectItem> projectList = workspaceProvider.getWorkspace().getProjects();
    if (!projectList.isEmpty()) {
        ProjectItem projectItem = Iterables.getFirst(projectList, null);
        return Lists.newArrayList(projectItem.getChildren());
    }/*from w ww . jav  a  2s . c om*/
    return Lists.newArrayList();
}

From source file:org.dishevelled.bio.range.entrytree.CenteredRangeTree.java

/**
 * Create and return a new node for the specified range entries.
 *
 * @param entries range entries// w w w . j a va2 s . co m
 * @return a new node for the specified range entries
 */
private Node createNode(final Iterable<Entry<C, V>> entries) {
    Entry<C, V> first = Iterables.getFirst(entries, null);
    if (first == null) {
        return null;
    }
    Range<C> span = first.getRange();

    for (Entry<C, V> entry : entries) {
        Range<C> range = entry.getRange();
        span = range.span(span);
    }
    if (span.isEmpty()) {
        return null;
    }
    C center = Ranges.center(span);
    List<Entry<C, V>> left = Lists.newArrayList();
    List<Entry<C, V>> right = Lists.newArrayList();
    List<Entry<C, V>> overlap = Lists.newArrayList();

    for (Entry<C, V> entry : entries) {
        Range<C> range = entry.getRange();
        if (Ranges.isLessThan(range, center)) {
            left.add(entry);
        } else if (Ranges.isGreaterThan(range, center)) {
            right.add(entry);
        } else {
            overlap.add(entry);
        }
    }
    return new Node(center, createNode(left), createNode(right), overlap);
}

From source file:com.yahoo.yqlplus.engine.internal.source.ExportModuleAdapter.java

@Override
public OperatorNode<PhysicalExprOperator> callInRowContext(Location location, ContextPlanner context,
        String name, List<OperatorNode<ExpressionOperator>> arguments, OperatorNode<PhysicalExprOperator> row) {
    Collection<ObjectBuilder.MethodBuilder> targets = methods.get(name);
    if (targets.isEmpty()) {
        throw new ProgramCompileException(location, "Method '%s' not found on module %s", name, moduleName);
    }/*from   ww w  .j av  a  2s .c  o  m*/
    @SuppressWarnings("ConstantConditions")
    GambitCreator.Invocable firstInvocable = Iterables.getFirst(targets, null).invoker();
    TypeWidget outputType = firstInvocable.getReturnType();
    DynamicExpressionEvaluator eval = row == null ? new DynamicExpressionEvaluator(context)
            : new DynamicExpressionEvaluator(context, row);
    List<OperatorNode<PhysicalExprOperator>> callArgs = Lists.newArrayList();
    callArgs.add(getModule(location, context));
    callArgs.add(context.getContextExpr());
    if (targets.size() > 1) {
        callArgs.addAll(eval.applyAll(arguments));
        for (ObjectBuilder.MethodBuilder candidate : targets) {
            outputType = context.getValueTypeAdapter().unifyTypes(outputType,
                    candidate.invoker().getReturnType());
        }
        return OperatorNode.create(location, PhysicalExprOperator.CALL, outputType, name, callArgs);
    } else {
        Iterator<TypeWidget> args = firstInvocable.getArgumentTypes().iterator();
        args.next();
        args.next();
        // consume the module & context
        Iterator<OperatorNode<ExpressionOperator>> e = arguments.iterator();
        while (args.hasNext()) {
            if (!e.hasNext()) {
                throw new ProgramCompileException(location,
                        "Argument length mismatch in call to %s (expects %d arguments)", name,
                        firstInvocable.getArgumentTypes().size());
            }
            callArgs.add(OperatorNode.create(location, PhysicalExprOperator.CAST, args.next(),
                    eval.apply(e.next())));
        }
        if (e.hasNext()) {
            throw new ProgramCompileException(location,
                    "Argument length mismatch in call to %s (expects %d arguments)", name,
                    firstInvocable.getArgumentTypes().size());
        }
        return OperatorNode.create(location, PhysicalExprOperator.INVOKE, firstInvocable, callArgs);
    }
}

From source file:org.dcache.pool.nearline.filesystem.FileSystemNearlineStorage.java

@Override
protected Set<Checksum> stage(StageRequest request) throws CacheException, IOException {
    FileAttributes fileAttributes = request.getFileAttributes();
    URI location = Iterables.getFirst(getLocations(fileAttributes), null);
    if (location == null) {
        throw new CacheException(CacheException.BROKEN_ON_TAPE,
                "File not on nearline storage: " + fileAttributes.getPnfsId());
    }/*from w ww .  j  a v a  2  s . com*/
    String path = location.getPath();
    if (path == null) {
        throw new InvalidMessageCacheException("Invalid nearline storage URI: " + location);
    }
    stage(getExternalPath(path.substring(1)), request.getFile().toPath());
    return Collections.emptySet();
}

From source file:nextmethod.web.razor.parser.syntaxtree.Block.java

@Override
public SourceLocation getStart() {
    final SyntaxTreeNode child = Iterables.getFirst(this.children, null);
    if (child == null) {
        return SourceLocation.Zero;
    }// w  ww  . ja  v  a2 s. c o m

    return child.getStart();
}

From source file:fr.mby.opa.picsimpl.dao.DbProposalDao.java

@Override
public ProposalBranch forkBranch(final ProposalBranch fork, final long branchToForkId) {
    Assert.notNull(fork, "No ProposalBag supplied !");
    Assert.isNull(fork.getId(), "Id should not be set for creation !");

    // Duplicate the branch to Fork
    new TxCallback(this.getEmf()) {

        @Override/*from www .j a  v a  2s .  com*/
        @SuppressWarnings("unchecked")
        protected void executeInTransaction(final EntityManager em) {
            final Query loadFullBranchQuery = em.createNamedQuery(ProposalBranch.LOAD_FULL_BRANCH);
            loadFullBranchQuery.setParameter("branchId", branchToForkId);
            final ProposalBranch branchToFork = Iterables.getFirst(loadFullBranchQuery.getResultList(), null);
            if (branchToFork == null) {
                throw new ProposalBranchNotFoundException();
            }

            fork.setBags(branchToFork.getBags());
            em.persist(fork);
        }
    };

    return fork;
}

From source file:com.facebook.buck.testutil.ZipArchive.java

/**
 * Open the zip file for reading and/or writing. Note that this constructor will create {@code
 * zip} if {@code forWriting} is true and the file does not exist.
 *
 * @param zip The zip file to operate on. The name must end with ".zip" or ".jar".
 * @param forWriting Whether the zip file should be opened for writing or not.
 * @throws IOException Should something terrible occur.
 *//*from w  w w  .j  a  v a  2  s  .co  m*/
public ZipArchive(Path zip, boolean forWriting) throws IOException {
    String extension = MorePaths.getFileExtension(zip);
    assertTrue("zip name must end with .zip for file type detection to work",
            "zip".equals(extension) || "jar".equals(extension));

    URI uri = URI.create("jar:" + zip.toUri());
    fs = FileSystems.newFileSystem(uri, ImmutableMap.of("create", String.valueOf(forWriting)));

    root = Iterables.getFirst(fs.getRootDirectories(), null);
    assertNotNull("Unable to determine root of file system: " + fs, root);
}

From source file:com.dmdirc.config.profiles.ProfileManager.java

/**
 * Returns the default profile if no custom profiles have been set.
 *
 * @return Default profile/*from  ww w.  j  av  a 2  s  .  c  o m*/
 */
public Profile getDefault() {
    return Iterables.getFirst(profiles, defaultProfile);
}

From source file:org.yakindu.base.expressions.linking.OperationOverloadingLinkingService.java

public List<EObject> getLinkedOperation(ArgumentExpression context, EReference ref, INode node) {
    final EClass requiredType = ref.getEReferenceType();
    if (requiredType == null) {
        return Collections.<EObject>emptyList();
    }//from w w w  .j  a  va2s  .  co m
    final String crossRefString = getCrossRefNodeAsString(node);
    if (crossRefString == null || crossRefString.equals("")) {
        return Collections.<EObject>emptyList();
    }
    final IScope scope = getScope(context, ref);
    final QualifiedName qualifiedLinkName = qualifiedNameConverter.toQualifiedName(crossRefString);
    // Adoption to super class implementation here to return multi elements
    final Iterable<IEObjectDescription> eObjectDescription = scope.getElements(qualifiedLinkName);
    int size = Iterables.size(eObjectDescription);
    if (size == 0)
        return Collections.emptyList();
    if (size == 1)
        return Collections.singletonList(Iterables.getFirst(eObjectDescription, null).getEObjectOrProxy());
    // Two operation with same name found here
    List<IEObjectDescription> candidates = new ArrayList<>();
    for (IEObjectDescription currentDescription : eObjectDescription) {
        if (currentDescription.getEClass().isSuperTypeOf(TypesPackage.Literals.OPERATION)) {
            candidates.add(currentDescription);
        }
    }
    Optional<Operation> operation = operationsLinker.linkOperation(candidates, context);
    if (operation.isPresent()) {
        return Collections.singletonList(operation.get());
    }
    //Link to first operation to get parameter errors instead of linking errors
    return Collections.singletonList(Iterables.getFirst(eObjectDescription, null).getEObjectOrProxy());
}

From source file:io.helixservice.feature.restservice.controller.Request.java

/**
 * Gets the first value found for the given  query parameter
 *
 * @param parameterName Query parameter name
 * @param defaultValue Default value if the parameter does not exist
 * @return The first parameter value found, or the default value
 *///from   w w w  .java2 s.c o m
public String getParam(String parameterName, String defaultValue) {
    return Iterables.getFirst(params.get(parameterName), defaultValue);
}