Example usage for java.util Collections singletonList

Introduction

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

Prototype

public static <T> List<T> singletonList(T o)

Source Link

Document

Returns an immutable list containing only the specified object.

Usage

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
 */// ww  w  . j ava  2 s  .c  om
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:XMLResourceBundleControl.java

public List<String> getFormats(String baseName) {
    return Collections.singletonList(XML);
}

From source file:Main.java

/**
 * Returns a collection with fast contains() implementation. The collection
 * is intended to be reusable. A single use will not be efficient as it
 * allocates memory for the new collection.
 * //  ww w. ja v a  2 s . c o  m
 * Most efficient with primitive objects (String, Integer...)
 */
@SuppressWarnings("unchecked")
public static <T> Collection<T> fastSearchCollection(List<T> list) {
    final int size = list.size();
    if (size == 0)
        return Collections.EMPTY_LIST;

    if (size == 1)
        Collections.singletonList(list.get(0));

    // optimization for short list, avoid hash
    if (size <= 8) {
        if (list instanceof ArrayList)
            // ArrayList similar to Arrays for short lists, save some
            // memory.
            return (ArrayList<T>) list;

        // not ArrayList, play safe with final array type list
        T[] s = (T[]) list.toArray();
        return Arrays.asList(s);
    }
    // big lists, use hash (constant time)
    return new HashSet<T>(list);
}

From source file:XMLResourceBundleControl.java

public List<String> getFormats(String baseName) {
        return Collections.singletonList(XML);
    }

From source file:com.cognifide.cq.cqsm.core.scripts.ScriptFilters.java

public static Predicate filterByExecutionMode(final ExecutionMode mode) {
    return filterByExecutionMode(Collections.singletonList(mode));
}

From source file:com.hp.autonomy.aci.content.fieldtext.MATCHALL.java

public MATCHALL(final String field, final String value, final String... values) {
    this(Collections.singletonList(field), value, values);
}

From source file:com.hp.autonomy.aci.content.fieldtext.NOTMATCH.java

public NOTMATCH(final String field, final String value, final String... values) {
    this(Collections.singletonList(field), value, values);
}

From source file:Lists.java

public static <T> List<T> add(List<T> list, int index, T toAdd) {
    switch (list.size()) {
    case 0://from www . ja  v a  2s  .c  o m
        // Empty -> Singleton
        if (index != 0) {
            throw newIndexOutOfBounds(list, index);
        }
        return Collections.singletonList(toAdd);
    case 1: {
        // Singleton -> ArrayList
        List<T> result = new ArrayList<T>(2);
        switch (index) {
        case 0:
            result.add(toAdd);
            result.add(list.get(0));
            return result;
        case 1:
            result.add(list.get(0));
            result.add(toAdd);
            return result;
        default:
            throw newIndexOutOfBounds(list, index);
        }
    }
    default:
        // ArrayList
        list.add(index, toAdd);
        return list;
    }
}

From source file:com.royclarkson.springagram.RestUtils.java

public static HttpEntity<Void> getRequestEntity() {
    if (requestEntity == null) {
        HttpHeaders requestHeaders = new HttpHeaders();
        requestHeaders.setAccept(Collections.singletonList(new MediaType("application", "hal+json")));
        requestEntity = new HttpEntity<Void>(requestHeaders);
    }/*from   w  ww.  jav  a 2  s  . c  o m*/
    return requestEntity;
}

From source file:com.orange.cepheus.broker.Util.java

static public RegisterContext createRegistrationContext(String entityId, String entityType,
        boolean entityIsPattern, String providingApp, String attr) throws Exception {
    RegisterContext registerContext = new RegisterContext();
    registerContext.setDuration("PT1M");

    ContextRegistration contextRegistration = new ContextRegistration();
    contextRegistration/*from   w  w w .j  av a2s  . co m*/
            .setEntityIdList(Collections.singletonList(new EntityId(entityId, entityType, entityIsPattern)));
    contextRegistration.setContextRegistrationAttributeList(
            Collections.singletonList(new ContextRegistrationAttribute(attr, false)));
    contextRegistration.setProvidingApplication(new URI(providingApp));
    registerContext.setContextRegistrationList(Collections.singletonList(contextRegistration));

    return registerContext;
}