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.github.blacklocus.rdsecho.utl.Route53Find.java

public Optional<HostedZone> hostedZone(final Predicate<HostedZone> predicate) {
    return Optional.fromNullable(Iterables.getFirst(hostedZones(predicate), null));
}

From source file:net.minecraftforge.fml.common.asm.transformers.MarkerTransformer.java

private void readMapFile(String rulesFile) throws IOException {
    File file = new File(rulesFile);
    URL rulesResource;// w ww  . ja v a2 s.  c  o m
    if (file.exists()) {
        rulesResource = file.toURI().toURL();
    } else {
        rulesResource = Resources.getResource(rulesFile);
    }
    Resources.readLines(rulesResource, Charsets.UTF_8, new LineProcessor<Void>() {
        @Override
        public Void getResult() {
            return null;
        }

        @Override
        public boolean processLine(String input) throws IOException {
            String line = Iterables.getFirst(Splitter.on('#').limit(2).split(input), "").trim();
            if (line.length() == 0) {
                return true;
            }
            List<String> parts = Lists.newArrayList(Splitter.on(" ").trimResults().split(line));
            if (parts.size() != 2) {
                throw new RuntimeException("Invalid config file line " + input);
            }
            List<String> markerInterfaces = Lists
                    .newArrayList(Splitter.on(",").trimResults().split(parts.get(1)));
            for (String marker : markerInterfaces) {
                markers.put(parts.get(0), marker);
            }
            return true;
        }
    });
}

From source file:com.google.idea.blaze.base.run.targetfinder.TargetFinder.java

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

From source file:org.apache.metron.writer.WriterToBulkWriter.java

@Override
public BulkWriterResponse write(String sensorType, WriterConfiguration configurations, Iterable<Tuple> tuples,
        List<MESSAGE_T> messages) throws Exception {
    BulkWriterResponse response = new BulkWriterResponse();
    if (messages.size() > 1) {
        response.addAllErrors(new IllegalStateException("WriterToBulkWriter expects a batch of exactly 1"),
                tuples);/*from w  w w  . j  a  v  a  2 s.c  o  m*/
        return response;
    }

    try {
        messageWriter.write(sensorType, configurations, Iterables.getFirst(tuples, null),
                Iterables.getFirst(messages, null));
    } catch (Exception e) {
        response.addAllErrors(e, tuples);
        return response;
    }

    response.addAllSuccesses(tuples);
    return response;
}

From source file:com.eviware.loadui.integration.LoadUIUtils.java

public static String getOpenedProjectName(WorkspaceProvider workspaceProvider) {
    ProjectItem projectItem = Iterables.getFirst(workspaceProvider.getWorkspace().getProjects(), null);
    String openedProjectName = projectItem != null ? projectItem.getLabel() : "";

    return openedProjectName;
}

From source file:org.n52.javaps.coding.stream.AbstractSimilarityKeyRepository.java

protected C choose(Set<C> matches, K key) {
    if (matches == null || matches.isEmpty()) {
        LOG.debug("No implementation for {}", key);
        return null;
    } else if (matches.size() > 1) {
        return chooseFrom(matches, key);
    } else {//from   www  .j av a2s  . co m
        return Iterables.getFirst(matches, null);
    }
}

From source file:io.jenkins.blueocean.preload.FavoritesStatePreloader.java

@Override
protected FetchData getFetchData(@Nonnull BlueUrlTokenizer blueUrl) {
    User jenkinsUser = User.current();//  w w  w. j a  v  a2 s. c om
    if (jenkinsUser != null) {
        BlueOrganization organization = Iterables.getFirst(OrganizationFactory.getInstance().list(), null);
        if (organization != null) {
            String pipelineFullName = blueUrl.getPart(BlueUrlTokenizer.UrlPart.PIPELINE);

            // don't need this list when at pipeline pages
            if (pipelineFullName != null) {
                return null;
            }

            UserImpl blueUser = new UserImpl(organization, jenkinsUser, organization.getUsers());
            BlueFavoriteContainer favoritesContainer = blueUser.getFavorites();

            if (favoritesContainer != null) {
                JSONArray favorites = new JSONArray();
                // Limit the number of favorites to return to a sane amount
                Iterator<BlueFavorite> favoritesIterator = favoritesContainer.iterator(0, DEFAULT_LIMIT);

                while (favoritesIterator.hasNext()) {
                    Reachable favorite = favoritesIterator.next();
                    try {
                        favorites.add(JSONObject.fromObject(Export.toJson(favorite)));
                    } catch (IOException e) {
                        LOGGER.log(Level.FINE,
                                String.format("Unable to preload favorites for User '%s'. Serialization error.",
                                        jenkinsUser.getFullName()),
                                e);
                        return null;
                    }
                }

                return new FetchData(favoritesContainer.getLink().getHref() + "?start=0&limit=" + DEFAULT_LIMIT,
                        favorites.toString());
            }
        }
    }

    // Don't preload any data on the page.
    return null;
}

From source file:com.facebook.presto.tpch.SampledTpchRecordSetProvider.java

@Override
public RecordSet getRecordSet(Split split, List<? extends ColumnHandle> columns) {
    int sampleWeightField = -1;
    for (int i = 0; i < columns.size(); i++) {
        ColumnHandle column = columns.get(i);
        if (column instanceof TpchColumnHandle && ((TpchColumnHandle) column).getColumnName()
                .equals(SampledTpchMetadata.SAMPLE_WEIGHT_COLUMN_NAME)) {
            sampleWeightField = i;//from  w ww.j a v  a2 s  .c o m
            break;
        }
    }
    List<? extends ColumnHandle> delegatedColumns = new ArrayList<>(columns);
    if (sampleWeightField > -1) {
        delegatedColumns.remove(sampleWeightField);
        RecordSet recordSet;
        if (delegatedColumns.isEmpty()) {
            // Pick a random column, so that we can figure out how many rows there are
            TpchSplit tpchSplit = (TpchSplit) split;
            ColumnHandle column = Iterables
                    .getFirst(metadata.getColumnHandles(tpchSplit.getTableHandle()).values(), null);
            checkNotNull(column, "Could not find any columns");
            recordSet = new EmptyRecordSet(super.getRecordSet(split, ImmutableList.of(column)));
        } else {
            recordSet = super.getRecordSet(split, delegatedColumns);
        }
        return new SampledTpchRecordSet(recordSet, sampleWeightField, sampleWeight);
    } else {
        return super.getRecordSet(split, columns);
    }
}

From source file:org.eclipse.osee.orcs.db.internal.sql.SqlAliasManager.java

public String getFirstAlias(int level, AliasEntry table, ObjectType objectType) {
    Collection<String> aliases = getAliases(level, table, objectType);
    return Iterables.getFirst(aliases, null);
}

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

public static String zkConnectStringToPort(String connString) {
    String hostPortPair = Iterables.getFirst(Splitter.on(",").split(connString), "");
    return Iterables.getLast(Splitter.on(":").split(hostPortPair), DEFAULT_ZK_PORT);
}