Example usage for java.util Collection isEmpty

Introduction

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

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this collection contains no elements.

Usage

From source file:cross.io.PropertyFileGenerator.java

/**
 * Creates a property object for the given class, containing those fields,
 * which are annotated by {/* w  w  w.j  a  v a2s. com*/
 *
 * @return 
 * @Configurable}.
 * @param c
 */
public static PropertiesConfiguration createProperties(Class<?> c) {
    Collection<String> keys = AnnotationInspector.getRequiredConfigKeys(c);
    if (!keys.isEmpty()) {
        PropertiesConfiguration pc = new PropertiesConfiguration();
        for (String key : keys) {
            pc.addProperty(key, AnnotationInspector.getDefaultValueFor(c, key));
        }
        return pc;
    } else {
        LoggerFactory.getLogger(PropertyFileGenerator.class)
                .info("Could not find annotated configuration keys for class {}!", c.getName());
    }
    return new PropertiesConfiguration();
}

From source file:com.cloudera.oryx.common.math.VectorMath.java

/**
 * @param M tall, skinny matrix/* www  .  jav a  2  s  .c  o m*/
 * @return MT * M as a dense matrix
 */
public static RealMatrix transposeTimesSelf(Collection<float[]> M) {
    if (M == null || M.isEmpty()) {
        return null;
    }
    int features = 0;
    RealMatrix result = null;
    for (float[] vector : M) {
        if (result == null) {
            features = vector.length;
            result = new Array2DRowRealMatrix(features, features);
        }
        for (int row = 0; row < features; row++) {
            float rowValue = vector[row];
            for (int col = 0; col < features; col++) {
                result.addToEntry(row, col, rowValue * vector[col]);
            }
        }
    }
    return result;
}

From source file:Main.java

/**
 * Checks if the given collection is instancied and not empty
 *
 * @param <T>//from   w  w w.j  a  v  a2  s  .  c  o m
 * @param collection
 * @return
 */
public static <T> boolean isNotEmpty(final Collection<T> collection) {
    return collection != null && !collection.isEmpty();
}

From source file:Main.java

/**
 * Creates a map with the elements of the collection as values using the
 * specified keyMethod to obtain the key from the elements.
 *//* w  w  w  .  ja  v a 2  s. co m*/
@SuppressWarnings("unchecked")
public static <K, T> Map<K, T> createMap(Collection<T> collection, String keyMethod) {
    Map<K, T> map = new HashMap<>(collection.size());

    if (collection.isEmpty()) {
        return map;
    }

    Class<?> elementClass = collection.iterator().next().getClass();

    Method getKeyMethod;

    try {
        getKeyMethod = elementClass.getMethod(keyMethod, new Class[0]);
    } catch (Exception e) {
        throw new RuntimeException("Failed to get key method", e);
    }

    for (T element : collection) {
        K key;
        try {
            key = (K) getKeyMethod.invoke(element, (Object[]) null);
        } catch (Exception e) {
            throw new RuntimeException("Failed to get key", e);
        }

        map.put(key, element);
    }

    return map;
}

From source file:adalid.commons.util.ColUtils.java

public static <T extends Comparable<? super T>> Collection<T> sort(Collection<T> collection) {
    if (collection instanceof List && !collection.isEmpty()) {
        List<T> list = (List<T>) collection;
        Collections.sort(list);//from   w  w w. j a  va  2 s .c om
    }
    return collection;
}

From source file:de.kbs.acavis.integration.mas.odata.EntityHelper.java

public static String idLongInList(String property, Collection<Long> ids) {
    // Avoid errors caused by empty filter-statements using a valid but false expression
    if (ids.isEmpty())
        return "1 eq 0";

    return property + " eq " + StringUtils.join(ids, " or " + property + " eq ");
}

From source file:com.jkoolcloud.tnt4j.streams.sample.custom.SampleIntegration.java

/**
 * Configure streams and parsers, and run each stream in its own thread.
 *
 * @param cfgFileName/*from w w  w . j  av a2s.c o m*/
 *            configuration file name
 */
public static void loadConfigAndRun(String cfgFileName) {
    try {
        StreamsConfigLoader cfg = StringUtils.isEmpty(cfgFileName) ? new StreamsConfigLoader()
                : new StreamsConfigLoader(cfgFileName);
        Collection<TNTInputStream<?, ?>> streams = cfg.getStreams();
        if (streams == null || streams.isEmpty()) {
            throw new IllegalStateException("No Activity Streams found in configuration"); // NON-NLS
        }

        ThreadGroup streamThreads = new ThreadGroup("Streams"); // NON-NLS
        StreamThread ft;
        for (TNTInputStream<?, ?> stream : streams) {
            ft = new StreamThread(streamThreads, stream,
                    String.format("%s:%s", stream.getClass().getSimpleName(), stream.getName())); // NON-NLS
            ft.start();
        }
    } catch (Exception e) {
        LOGGER.log(OpLevel.ERROR, String.valueOf(e.getLocalizedMessage()), e);
    }
}

From source file:de.kbs.acavis.integration.mas.odata.EntityHelper.java

public static String idInList(String property, Collection<Integer> ids) {
    // Avoid errors caused by empty filter-statements using a valid but false expression
    if (ids.isEmpty())
        return "1 eq 0";

    return property + " eq " + StringUtils.join(ids, " or " + property + " eq ");
}

From source file:grakn.core.util.GraqlTestUtil.java

public static <T> void assertCollectionsNonTriviallyEqual(Collection<T> c1, Collection<T> c2) {
    assertFalse("Trivial equality!", c1.isEmpty() && c2.isEmpty());
    assertCollectionsEqual(c1, c2);/*from w  ww  . j av  a 2  s .  c  o  m*/
}

From source file:grakn.core.util.GraqlTestUtil.java

public static <T> void assertCollectionsNonTriviallyEqual(String msg, Collection<T> c1, Collection<T> c2) {
    assertFalse("Trivial equality!", c1.isEmpty() && c2.isEmpty());
    assertCollectionsEqual(msg, c1, c2);
}