Example usage for java.util Collections emptyList

Introduction

In this page you can find the example usage for java.util Collections emptyList.

Prototype

@SuppressWarnings("unchecked")
public static final <T> List<T> emptyList()

Source Link

Document

Returns an empty list (immutable).

Usage

From source file:org.grails.datastore.mapping.redis.query.RedisQueryUtils.java

public static List<Long> transformRedisResults(ConversionService conversionService,
        Collection<String> results) {
    List<Long> returnResults;
    if (!results.isEmpty()) {
        List<Long> foreignKeys = new ArrayList<Long>();
        for (String result : results) {
            foreignKeys.add(conversionService.convert(result, Long.class));
        }//from   w ww . j a va2 s. com
        returnResults = foreignKeys;
    } else {
        returnResults = Collections.emptyList();
    }
    return returnResults;
}

From source file:Main.java

public static List<Element> elements(Element element, String tagName) {
    if (element == null || !element.hasChildNodes()) {
        return Collections.emptyList();
    }//  w  w  w  .  ja  v a  2  s.c  o m

    List<Element> elements = new ArrayList<Element>();
    for (Node child = element.getFirstChild(); child != null; child = child.getNextSibling()) {
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            Element childElement = (Element) child;
            String childTagName = childElement.getLocalName();

            if (tagName.equals(childTagName))
                elements.add(childElement);
        }
    }
    return elements;
}

From source file:Main.java

public static List<Attr> attributes(Element element) {
    NamedNodeMap attributeMap = element.getAttributes();
    if ((attributeMap == null) || (attributeMap.getLength() == 0)) {
        return Collections.emptyList();
    }//from  w  w  w.  j ava  2 s.  c  o m

    List<Attr> attributes = new ArrayList<Attr>();
    for (int i = 0; i < attributeMap.getLength(); i++) {
        attributes.add((Attr) attributeMap.item(i));
    }

    return attributes;
}

From source file:ru.mystamps.web.support.spring.security.SecurityContextUtils.java

/**
 * @author Sergey Chechenev/*from   w w  w  . j  a  v a  2s  .  co m*/
 */
public static boolean hasAuthority(GrantedAuthority authority) {
    return Optional.ofNullable(SecurityContextHolder.getContext().getAuthentication())
            .map(Authentication::getAuthorities).orElse(Collections.emptyList()).contains(authority);
}

From source file:Main.java

public static List<Element> elementsQName(Element element, Set<QName> allowedTagNames) {
    if (element == null || !element.hasChildNodes()) {
        return Collections.emptyList();
    }//from   w w  w  .  jav a  2s .  co  m

    List<Element> elements = new ArrayList<Element>();
    for (Node child = element.getFirstChild(); child != null; child = child.getNextSibling()) {
        if (child.getNodeType() == Node.ELEMENT_NODE) {
            Element childElement = (Element) child;
            QName childQName = new QName(childElement.getNamespaceURI(), childElement.getLocalName());
            if (allowedTagNames.contains(childQName)) {
                elements.add(childElement);
            }
        }
    }
    return elements;
}

From source file:alfio.model.result.Result.java

public static <T> Result<T> success(T data) {
    return new Result<>(ResultStatus.OK, data, Collections.emptyList());
}

From source file:com.spotify.styx.YamlScheduleDefinition.java

@JsonCreator
public static YamlScheduleDefinition create(
        @JsonProperty("schedules") @Nullable List<WorkflowConfiguration> workflowConfigurations) {
    if (workflowConfigurations == null) {
        workflowConfigurations = Collections.emptyList();
    }/*from w  w  w  .j  av a2  s  . c  o m*/
    return new AutoValue_YamlScheduleDefinition(workflowConfigurations);
}

From source file:com.cloudera.oryx.ml.param.RandomSearch.java

/**
 * @param ranges ranges of hyperparameters to try, one per hyperparameters
 * @param howMany how many combinations of hyperparameters to return
 * @return combinations of concrete hyperparameter values
 *//*from w  w w.j  a  va2s.c o  m*/
static List<List<?>> chooseHyperParameterCombos(Collection<? extends HyperParamValues<?>> ranges, int howMany) {
    Preconditions.checkArgument(howMany > 0);

    int numParams = ranges.size();
    if (numParams == 0) {
        return Collections.singletonList(Collections.emptyList());
    }

    RandomDataGenerator rdg = new RandomDataGenerator(RandomManager.getRandom());
    List<List<?>> allCombinations = new ArrayList<>(howMany);
    for (int i = 0; i < howMany; i++) {
        List<Object> combination = new ArrayList<>(numParams);
        for (HyperParamValues<?> range : ranges) {
            combination.add(range.getRandomValue(rdg));
        }
        allCombinations.add(combination);
    }

    return allCombinations;
}

From source file:Main.java

public static <E> Collection<List<E>> selectExactly(List<E> original, int nb) {
    if (nb < 0) {
        throw new IllegalArgumentException();
    }//  w w w . j  av  a 2  s  .com
    if (nb == 0) {
        return Collections.emptyList();
    }
    if (nb == 1) {
        final List<List<E>> result = new ArrayList<List<E>>();
        for (E element : original) {
            result.add(Collections.singletonList(element));
        }
        return result;

    }
    if (nb > original.size()) {
        return Collections.emptyList();
    }
    if (nb == original.size()) {
        return Collections.singletonList(original);
    }
    final List<List<E>> result = new ArrayList<List<E>>();

    for (List<E> subList : selectExactly(original.subList(1, original.size()), nb - 1)) {
        final List<E> newList = new ArrayList<E>();
        newList.add(original.get(0));
        newList.addAll(subList);
        result.add(Collections.unmodifiableList(newList));
    }
    result.addAll(selectExactly(original.subList(1, original.size()), nb));

    return Collections.unmodifiableList(result);
}

From source file:Main.java

public static List<String> stringToList(@Nullable String arrayString) {
    if (TextUtils.isEmpty(arrayString)) {
        return Collections.emptyList();
    }/*from ww  w.  jav  a2 s.c  om*/
    final String[] splitted = arrayString.trim().split(" ");
    final ArrayList<String> list = new ArrayList<>(Arrays.asList(splitted));
    Collections.sort(list);
    return list;
}