Example usage for java.util Collection stream

Introduction

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

Prototype

default Stream<E> stream()

Source Link

Document

Returns a sequential Stream with this collection as its source.

Usage

From source file:edu.emory.bmi.datacafe.core.DataCafeUtil.java

/**
 * Construct a string from a collection//  w  w w .  ja v  a2 s  .c o  m
 *
 * @param collection the collection
 * @return the collection as a comma separated line
 */
public static String constructQueryFromCollection(Collection collection) {
    // This line of code is genius (despite looking ugly).
    // Future maintainer: Be careful if you are trying to refactor it.
    return (String) collection.stream().map(i -> append_string_(i.toString())).collect(Collectors.joining(","));
}

From source file:edu.emory.bmi.datacafe.core.DataCafeUtil.java

/**
 * Construct a string from a collection//from ww w. j a v a2  s  .  c  o  m
 *
 * @param collection the collection
 * @return the collection as a comma separated line
 */
public static String constructStringFromCollection(Collection collection) {
    // This line of code is genius (despite looking ugly).
    // Future maintainer: Be careful if you are trying to refactor it.
    return (String) collection.stream().map(i -> doublequote(doubleTheDoubleQuote(i.toString())))
            .collect(Collectors.joining(","));
}

From source file:com.thinkbiganalytics.jobrepo.query.model.transform.JobModelTransform.java

public static List<ExecutedJob> executedJobs(Collection<? extends BatchJobExecution> jobs) {
    if (jobs != null && !jobs.isEmpty()) {
        return jobs.stream().map(jobExecution -> executedJob(jobExecution)).collect(Collectors.toList());
    } else {/*from  www.  ja va  2 s . co  m*/
        return Collections.emptyList();
    }
}

From source file:com.thinkbiganalytics.jobrepo.query.model.transform.JobModelTransform.java

public static List<ExecutedJob> executedJobsSimple(Collection<? extends BatchJobExecution> jobs) {
    if (jobs != null && !jobs.isEmpty()) {
        return jobs.stream().map(jobExecution -> executedJobSimple(jobExecution)).collect(Collectors.toList());
    } else {/*ww w .j  a v a  2 s  .com*/
        return Collections.emptyList();
    }
}

From source file:Main.java

/**
 * Selects the list of collection elements that satisfy the given filter.
 * If the filter is <code>null</code>, all the collection elements are returned.
 *
 * @param collection The collection to be filtered
 * @param filter     The filter to be applied
 * @param <T>        The type of collection elements
 * @return A list of elements satisfying the filter
 *//*from w w  w .j  a  va  2 s  . c  o m*/
public static <T> List<T> where(Collection<T> collection, Predicate<T> filter) {
    List<T> result = null;
    if (collection != null) {
        if (filter != null) {
            result = where(collection.stream(), filter);
        } else {
            result = (collection instanceof List ? (List<T>) collection : new ArrayList<>(collection));
        }
    }
    return result;
}

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

public static void write(Collection<Task> tasks, OutputStream output) throws IOException {
    try (final Writer writer = new OutputStreamWriter(output, StandardCharsets.UTF_8)) {
        final Iterable<String[]> iterable = () -> tasks.stream().sorted(ORDER)
                .map(task -> new String[] { Integer.toString(task.getId()), // id
                        task.getStage(), // stage
                        Long.toString(task.getDateTime().toInstant().getEpochSecond()), // datetime
                        String.join("|", task.getTags()), // tags
                        task.getType(), // type
                        task.getDescription(), // description
                        String.join("|", task.getAnswers()), // answers
                }).iterator();//  www  .j av a2s. c o  m

        FORMAT.withHeader(HEADER).print(writer).printRecords(iterable);
    }
}

From source file:com.spotify.heroic.filter.OrFilter.java

static SortedSet<Filter> flatten(final Collection<Filter> filters) {
    final SortedSet<Filter> result = new TreeSet<>();

    filters.stream().flatMap(f -> f.optimize().visit(new Visitor<Stream<Filter>>() {
        @Override//w  w  w . j av a  2  s  . co  m
        public Stream<Filter> visitOr(final OrFilter or) {
            return or.terms().stream().map(Filter::optimize);
        }

        @Override
        public Stream<Filter> visitNot(final NotFilter not) {
            // check for De Morgan's
            return not.getFilter().visit(new Filter.Visitor<Stream<Filter>>() {
                @Override
                public Stream<Filter> visitAnd(final AndFilter and) {
                    return and.terms().stream().map(f -> NotFilter.of(f).optimize());
                }

                @Override
                public Stream<Filter> defaultAction(final Filter filter) {
                    return Stream.of(not.optimize());
                }
            });
        }

        @Override
        public Stream<Filter> defaultAction(final Filter filter) {
            return Stream.of(filter);
        }
    })).forEach(result::add);

    return result;
}

From source file:com.thinkbiganalytics.jobrepo.query.model.transform.JobModelTransform.java

public static List<ExecutedStep> executedSteps(Collection<? extends BatchStepExecution> steps) {
    if (steps != null && !steps.isEmpty()) {
        return steps.stream().map(stepExecution -> executedStep(stepExecution)).collect(Collectors.toList());
    } else {/* ww w  .  jav  a 2  s.c o  m*/
        return Collections.emptyList();
    }
}

From source file:de.tudarmstadt.ukp.dkpro.argumentation.io.annotations.SpanAnnotationMatrices.java

public static <T extends SpanTextLabel> Sparse3DObjectMatrix<String, T> createMatrix(
        final Collection<T> spanAnnotationVector) {
    final Sparse3DObjectMatrix<String, T> result = new Sparse3DObjectMatrix<>(
            new Int2ObjectOpenHashMap<>(spanAnnotationVector.size() + 1));
    putAnnotations(result, spanAnnotationVector.stream());
    return result;

}

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

public static void write(Collection<Answer> answers, OutputStream output) throws IOException {
    try (final Writer writer = new OutputStreamWriter(output, StandardCharsets.UTF_8)) {
        final Iterable<String[]> iterable = () -> answers.stream().sorted(ORDER)
                .map(answer -> new String[] { Integer.toString(answer.getId()), // id
                        answer.getStage(), // stage
                        Long.toString(answer.getDateTime().toInstant().getEpochSecond()), // datetime
                        String.join("|", answer.getTags()), // tags
                        answer.getType(), // type
                        Integer.toString(answer.getTaskId()), // task_id
                        Integer.toString(answer.getWorkerId()), // worker_id
                        String.join("|", answer.getAnswers()) // answers
                }).iterator();// w  ww  . j ava2  s .c  o m

        FORMAT.withHeader(HEADER).print(writer).printRecords(iterable);
    }
}