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:org.ow2.proactive.workflow_catalog.rest.dto.Variable.java

public static List<Variable> to(
        Collection<? extends org.ow2.proactive.workflow_catalog.rest.entity.Variable> from) {
    return from.stream().map(entity -> new Variable(entity.getKey(), entity.getValue()))
            .collect(Collectors.toList());
}

From source file:io.github.jianzhichun.springboot.starters.swagger2.config.AutoSwagger2Configuration.java

static <T, R> List<R> map2list(Collection<T> collection, Function<? super T, ? extends R> mapper) {
    return collection.stream().map(mapper).collect(Collectors.toList());

}

From source file:com.github.horrorho.inflatabledonkey.cloud.clients.AssetTokenClient.java

public static List<Asset> assetsFromAssetsList(HttpClient httpClient, CloudKitty kitty, ProtectionZone zone,
        Collection<Assets> assetsList) throws IOException {

    List<String> fileList = assetsList.stream().map(Assets::nonEmptyFiles).flatMap(Collection::stream)
            .collect(Collectors.toList());
    return assets(httpClient, kitty, zone, fileList);

}

From source file:Main.java

public static <T, K, V, M extends Map<K, V>> M toMap(Collection<T> entities, Function<T, K> keyMapper,
        Function<T, V> valueMapper, Supplier<M> supplier) {
    return entities.stream().collect(Collectors.toMap(keyMapper, valueMapper, (a, b) -> b, supplier));
}

From source file:Main.java

/**
 * This method is a shortcut for {@code c.stream()} if c is not {@code null}. If c is {@code null},
 * this method will return an empty stream.
 *
 * @param c   Collection to create a Stream from. If {@code null}, an empty stream will be returned.
 * @param <T> Type of elements in collection.
 * @return Stream created from collection {@code c}.
 *///from  w w  w. ja  va 2 s  . c  o m
public static <T> Stream<T> $(Collection<T> c) {
    if (c == null) {
        return Stream.empty();
    }
    // else
    return c.stream();
}

From source file:ch.ivyteam.ivy.maven.util.ClasspathJar.java

private static List<String> getClassPathUris(Collection<File> classpathEntries) {
    return classpathEntries.stream().map(file -> file.toURI().toASCIIString()).collect(Collectors.toList());
}

From source file:com.github.horrorho.inflatabledonkey.cloud.clients.AssetTokenClient.java

public static List<Asset> assets(HttpClient httpClient, CloudKitty kitty, ProtectionZone zone,
        Collection<String> fileList) throws IOException {

    List<String> nonEmptyFileList = fileList.stream().filter(Assets::isNonEmpty).collect(Collectors.toList());
    logger.debug("-- assets() - non-empty file list size: {}", nonEmptyFileList.size());

    if (nonEmptyFileList.isEmpty()) {
        return new ArrayList<>();
    }// w  w  w  . j a v  a 2  s.  com

    List<CloudKit.RecordRetrieveResponse> responses = kitty.recordRetrieveRequest(httpClient, "_defaultZone",
            nonEmptyFileList);

    return responses.stream().filter(CloudKit.RecordRetrieveResponse::hasRecord)
            .map(CloudKit.RecordRetrieveResponse::getRecord).map(r -> asset(r, zone))
            .filter(Optional::isPresent).map(Optional::get).collect(Collectors.toList());
}

From source file:Main.java

public static <T> boolean hasCycle(Collection<T> vertices, Function<T, Collection<T>> neighborExtractor) {
    Map<T, Collection<T>> parents = vertices.stream().collect(toMap(identity(), v -> new ArrayList<T>()));
    vertices.forEach(//from  ww w .  jav  a 2 s .c o  m
            v -> nullSafeCollection(neighborExtractor.apply(v)).forEach(child -> parents.get(child).add(v)));

    Set<T> roots = vertices.stream().filter(v -> parents.get(v).isEmpty()).collect(Collectors.toSet());

    while (!roots.isEmpty()) {
        T root = roots.iterator().next();
        roots.remove(root);
        parents.remove(root);

        nullSafeCollection(neighborExtractor.apply(root)).forEach(child -> {
            parents.get(child).remove(root);
            if (parents.get(child).isEmpty()) {
                roots.add(child);
            }
        });

    }

    return !parents.isEmpty();
}

From source file:io.yields.math.concepts.operator.Smoothness.java

public static List<Tuple> normalize(Collection<Tuple> tuples) {
    DoubleSummaryStatistics statsForX = tuples.stream()
            .collect(Collectors.summarizingDouble(tuple -> tuple.getX()));
    DoubleSummaryStatistics statsForY = tuples.stream()
            .collect(Collectors.summarizingDouble(tuple -> tuple.getY()));
    double minX = statsForX.getMin();
    double maxX = statsForX.getMax();
    double minY = statsForY.getMin();
    double maxY = statsForY.getMax();
    return tuples.stream().map(tuple -> {
        double x = (tuple.getX() - minX) / (maxX - minX);
        double y = (tuple.getY() - minY) / (maxY - minY);
        return new Tuple(x, y);
    }).collect(Collectors.toList());
}

From source file:com.thoughtworks.go.config.CaseInsensitiveString.java

public static List<String> toStringList(Collection<CaseInsensitiveString> strings) {
    return toStringList(strings.stream());
}