Example usage for java.util.stream StreamSupport stream

Introduction

In this page you can find the example usage for java.util.stream StreamSupport stream.

Prototype

public static <T> Stream<T> stream(Spliterator<T> spliterator, boolean parallel) 

Source Link

Document

Creates a new sequential or parallel Stream from a Spliterator .

Usage

From source file:Main.java

/**
 * Convert a sequence of elements to the list.
 *
 * @param <I> Type of objects for input collection
 * @param <O> Type of objects for output collection
 * @param iterable The sequence of elements to convert. If the input
 *     sequence is empty, then the resulting collection will be empty
 * @param transformer The conversion function. If the transfer function is
 *     not set, the resulting collection will be empty
 * @return Reformed collection of input elements
 *///from  w  w  w .ja  v  a  2 s.c om
public static <I, O> List<O> transformWithoutNull(final Iterable<I> iterable,
        final Function<I, O> transformer) {
    return StreamSupport
            .stream(Optional.ofNullable(iterable).orElse(Collections.<I>emptySet()).spliterator(), false)
            .map(Optional.ofNullable(transformer).orElse(i -> null)).filter(Objects::nonNull)
            .collect(Collectors.toList());
}

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From source file:Main.java

public static <T> Set<T> union(Iterable<Set<T>> elements) {
    return StreamSupport.stream(elements.spliterator(), true).flatMap(Set::stream).collect(toSet());
}

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From source file:org.obiba.mica.web.model.GitCommitInfoDtos.java

@NotNull
public List<Mica.GitCommitInfoDto> asDto(Iterable<CommitInfo> commitInfos) {
    return StreamSupport.stream(commitInfos.spliterator(), false).map(this::asDto).collect(Collectors.toList());
}

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From source file:mtsar.api.csv.WorkerCSV.java

public static Iterator<Worker> parse(Stage stage, CSVParser csv) {
    final Set<String> header = csv.getHeaderMap().keySet();
    checkArgument(!Sets.intersection(header, Sets.newHashSet(HEADER)).isEmpty(), "Unknown CSV header: %s",
            String.join(",", header));

    return StreamSupport.stream(csv.spliterator(), false).map(row -> {
        final String id = row.isSet("id") ? row.get("id") : null;
        final String[] tags = row.isSet("tags") && !StringUtils.isEmpty(row.get("tags"))
                ? row.get("tags").split("\\|")
                : new String[0];
        final String datetime = row.isSet("datetime") ? row.get("datetime") : null;

        return new Worker.Builder().setId(StringUtils.isEmpty(id) ? null : Integer.valueOf(id))
                .setStage(stage.getId()).addAllTags(Arrays.asList(tags))
                .setDateTime(new Timestamp(StringUtils.isEmpty(datetime) ? System.currentTimeMillis()
                        : Long.parseLong(datetime) * 1000L))
                .build();/*w w w.  ja v  a2 s . com*/
    }).iterator();
}

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From source file:org.hawkular.services.rest.test.InventoryHelper.java

static List<ExtendedInventoryStructure> extractStructuresFromResponse(JsonNode response) {
    return StreamSupport.stream(response.spliterator(), true).map(node -> node.get("data"))
            .map(InventoryHelper::rebuildFromChunks).filter(Optional::isPresent).map(Optional::get)
            .collect(Collectors.toList());
}

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From source file:cn.edu.zjnu.acm.judge.mapper.BestSubmissionsBuilder.java

public static String bestSubmissions(@Param("problemId") long problemId, @Param("pageable") Pageable pageable) {
    Set<String> dejaVu = new TreeSet<>(String.CASE_INSENSITIVE_ORDER);
    Sort sort = Optional.ofNullable(pageable.getSort()).map(s -> s.and(DEFAULT_SORT)).orElse(DEFAULT_SORT);
    Sort.Order[] orders = StreamSupport.stream(sort.spliterator(), false)
            .filter(order -> ALLOW_COLUMNS.contains(order.getProperty()) && dejaVu.add(order.getProperty()))
            .toArray(Sort.Order[]::new);
    final int length = orders.length;
    log.debug("{}", Arrays.asList(orders));

    StringBuilder sb = new StringBuilder(
            "select " + SubmissionMapper.LIST_COLUMNS + " from solution s where problem_id=").append(problemId)
                    .append(" and score=100 ");
    for (int i = length - 1; i >= 0; --i) {
        sb.append("and(user_id");
        for (int j = 0; j <= i; ++j) {
            sb.append(',').append(orders[j].getProperty());
        }/*from ww w .j  a  v  a 2s .  c o  m*/
        sb.append(")in(select user_id");
        for (int j = 0; j < i; ++j) {
            sb.append(',').append(orders[j].getProperty());
        }
        sb.append(',').append(orders[i].isAscending() ? "min" : "max").append("(")
                .append(orders[i].getProperty()).append(")").append(orders[i].getProperty())
                .append(" from solution where problem_id=").append(problemId).append(" and score=100 ");
    }
    for (int i = 0; i < length; ++i) {
        sb.append("group by user_id)");
    }
    if (length > 0) {
        sb.append(" order by ");
        for (int i = 0; i < length; ++i) {
            if (i > 0) {
                sb.append(",");
            }
            sb.append(orders[i].getProperty());
            if (!orders[i].isAscending()) {
                sb.append(" desc");
            }
        }
    }
    return sb.append(" limit ").append(pageable.getOffset()).append(",").append(pageable.getPageSize())
            .toString();
}

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From source file:mtsar.api.csv.TaskCSV.java

public static Iterator<Task> parse(Stage stage, CSVParser csv) {
    final Set<String> header = csv.getHeaderMap().keySet();
    checkArgument(!Sets.intersection(header, Sets.newHashSet(HEADER)).isEmpty(), "Unknown CSV header: %s",
            String.join(",", header));

    return StreamSupport.stream(csv.spliterator(), false).map(row -> {
        final String id = row.isSet("id") ? row.get("id") : null;
        final String[] tags = row.isSet("tags") && !StringUtils.isEmpty(row.get("tags"))
                ? row.get("tags").split("\\|")
                : new String[0];
        final String type = row.get("type");
        final String description = row.isSet("description") ? row.get("description") : null;
        final String[] answers = row.isSet("answers") && !StringUtils.isEmpty(row.get("answers"))
                ? row.get("answers").split("\\|")
                : new String[0];
        final String datetime = row.isSet("datetime") ? row.get("datetime") : null;

        return new Task.Builder().setId(StringUtils.isEmpty(id) ? null : Integer.valueOf(id))
                .setStage(stage.getId()).addAllTags(Arrays.asList(tags))
                .setDateTime(new Timestamp(StringUtils.isEmpty(datetime) ? System.currentTimeMillis()
                        : Long.parseLong(datetime) * 1000L))
                .setType(StringUtils.defaultIfEmpty(type, TaskDAO.TASK_TYPE_SINGLE)).setDescription(description)
                .addAllAnswers(Arrays.asList(answers)).build();
    }).iterator();//w ww  .  jav a 2  s. c o m
}

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From source file:Main.java

/**
 * Converts an {@link java.util.Iterator} to {@link java.util.stream.Stream}.
 *//*from  w  ww . ja va2  s  .co  m*/
public static <T> Stream<T> iterate(Iterator<? extends T> iterator) {
    int characteristics = Spliterator.ORDERED | Spliterator.IMMUTABLE;
    return StreamSupport.stream(Spliterators.spliteratorUnknownSize(iterator, characteristics), false);
}

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From source file:net.hamnaberg.json.Item.java

public static Item create(Optional<URI> href, Iterable<Property> properties, List<Link> links) {
    ObjectNode node = JsonNodeFactory.instance.objectNode();
    href.ifPresent(uri -> node.put("href", uri.toString()));
    if (!Iterables.isEmpty(properties)) {
        node.set("data", StreamSupport.stream(properties.spliterator(), false).map(Extended::asJson)
                .collect(JsonNodeFactory.instance::arrayNode, ArrayNode::add, ArrayNode::addAll));
    }//from   w ww  .j  av a 2  s . co  m
    if (!Iterables.isEmpty(links)) {
        node.set("links", StreamSupport.stream(links.spliterator(), false).map(Extended::asJson)
                .collect(JsonNodeFactory.instance::arrayNode, ArrayNode::add, ArrayNode::addAll));
    }
    return new Item(node);
}

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From source file:mtsar.api.csv.AnswerCSV.java

public static Iterator<Answer> parse(Stage stage, CSVParser csv) {
    final Set<String> header = csv.getHeaderMap().keySet();
    checkArgument(!Sets.intersection(header, Sets.newHashSet(HEADER)).isEmpty(), "Unknown CSV header: %s",
            String.join(",", header));

    return StreamSupport.stream(csv.spliterator(), false).map(row -> {
        final String id = row.isSet("id") ? row.get("id") : null;
        final String[] tags = row.isSet("tags") && !StringUtils.isEmpty(row.get("tags"))
                ? row.get("tags").split("\\|")
                : new String[0];
        final String type = row.isSet("type") ? row.get("type") : null;
        final String workerId = row.get("worker_id");
        final String taskId = row.get("task_id");
        final String[] answers = row.isSet("answers") && !StringUtils.isEmpty(row.get("answers"))
                ? row.get("answers").split("\\|")
                : new String[0];
        final String datetime = row.isSet("datetime") ? row.get("datetime") : null;

        return new Answer.Builder().setId(StringUtils.isEmpty(id) ? null : Integer.valueOf(id))
                .setStage(stage.getId()).addAllTags(Arrays.asList(tags))
                .setDateTime(new Timestamp(StringUtils.isEmpty(datetime) ? System.currentTimeMillis()
                        : Long.parseLong(datetime) * 1000L))
                .setType(StringUtils.defaultIfEmpty(type, AnswerDAO.ANSWER_TYPE_DEFAULT))
                .setWorkerId(Integer.valueOf(workerId)).setTaskId(Integer.valueOf(taskId))
                .addAllAnswers(Arrays.asList(answers)).build();
    }).iterator();/*ww  w  . j  a  va 2s .c o m*/
}

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