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:com.example.user.UserEndpoint.java

public static void main(String[] args) {
    final ObjectMapper objectMapper = new ObjectMapper().registerModule(new Jackson2HalModule())
            .disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES)
            .setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
    final MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter(objectMapper);
    converter.setSupportedMediaTypes(Collections.singletonList(MediaTypes.HAL_JSON));
    final RestTemplate restTemplate = new RestTemplate(Collections.singletonList(converter));
    final ResponseEntity<PagedResources<Resource<UserEntity>>> entity = restTemplate.exchange(
            "http://localhost:5000/db-app/users", HttpMethod.GET, null,
            new ParameterizedTypeReference<PagedResources<Resource<UserEntity>>>() {
            });/*from   w  w w .j a v a 2s.co  m*/
    System.out.println(entity.getStatusCode());
    final PagedResources<Resource<UserEntity>> body = entity.getBody();
    System.out.println(body);
    final Collection<Resource<UserEntity>> contents = body.getContent();
    final List<UserEntity> userEntities = contents.stream().map(Resource::getContent).collect(toList());
}

From source file:Main.java

public static String saveIntegerListToXml(Collection<Integer> list) {
    return list.stream().map(String::valueOf).collect(Collectors.joining(" "));
}

From source file:Main.java

public static <T> Stream<T> stream(Collection<T> collection) {
    return collection.stream();
}

From source file:Main.java

/**
 * Returns true if any element of {@code items} is null.
 * @throws NullPointerException if {@code items} itself is null.
 *//*from ww  w.  j a  v a 2  s  .  c  o  m*/
public static boolean isAnyNull(Collection<?> items) {
    return items.stream().anyMatch(Objects::isNull);
}

From source file:Main.java

static List<File> exists(Collection<File> files) {
    return files.stream().filter(File::exists).collect(Collectors.toList());
}

From source file:Main.java

public static void anyMatch(Collection<String> strings, Predicate<String> string) {
    strings.stream().anyMatch(string);
}

From source file:Main.java

public static <T> T find(Collection<T> collection, Predicate<T> predicate) {
    return collection.stream().filter(predicate).findFirst().orElse(null);
}

From source file:Main.java

/**
 * Applies the given consumer to each item in the given collection after filtering
 * out null items./*w w w  .j  a v  a  2 s .c  o m*/
 * 
 * @param collection the collection.
 * @param consumer the consumer.
 */
public static <E> void nullSafeForEach(Collection<E> collection, Consumer<E> consumer) {
    collection.stream().filter(Objects::nonNull).forEach(consumer);
}

From source file:Main.java

public static <T> List<T> filter(Collection<T> toFilter, Predicate<T> predicate) {
    return toFilter.stream().filter(predicate).collect(Collectors.toList());
}

From source file:Main.java

/**
 * Joins the items of the specified collection using a delimited.
 *
 * @param list List of items to join, cannot be null
 * @param delimiter Delimiter used to join the items, cannot be null
 *//*from w  ww .  ja v a  2  s . c om*/
public static <T> String join(Collection<T> list, String delimiter) {
    return list.stream().map(Object::toString).collect(Collectors.joining(delimiter));
}