Example usage for java.util Collection size

Introduction

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

Prototype

int size();

Source Link

Document

Returns the number of elements in this collection.

Usage

From source file:com.enonic.cms.core.content.contenttype.ContentTypeKey.java

public static int[] convertToIntArray(Collection<ContentTypeKey> keys) {
    int[] array = new int[keys.size()];
    int index = 0;
    for (ContentTypeKey key : keys) {
        array[index++] = key.toInt();//from  w  w w .j av a 2s .  c  om
    }
    return array;
}

From source file:Main.java

/**
 * Returns the size of a collection, or zero if the collection is null.
 * //from w w w  .ja v  a 2s . c  o  m
 * @param collection
 *            The collection to inspect, may be null.
 * @return The size of the collection, zero if the collection is null.
 */
public static int safeSize(final Collection<?> collection) {
    if (collection == null) {
        return 0;
    }
    return collection.size();
}

From source file:com.talis.entity.TestUtils.java

public static void assertQuadCollectionsEqual(Collection<Quad> first, Collection<Quad> second) {
    assertEquals(first.size(), second.size());
    assertTrue(first.containsAll(second));
}

From source file:Main.java

/**
 * Converts a collection to a primitive array of a given type.
 *
 * @param type       type of array to create
 * @param collection collection to convert, must contain items that extend T
 * @param <T>        type of array to create
 * @return primitive array of type T/*  w  w  w.ja va2  s  .  c  o m*/
 */
public static <T> T[] toArray(Class<T> type, Collection<? extends T> collection) {
    T[] array = (T[]) Array.newInstance(type, collection.size());
    int i = 0;
    for (T item : collection) {
        array[i++] = item;
    }

    return array;
}

From source file:de.zib.gndms.stuff.misc.LanguageAlgebra.java

/**
 * Get the largest prefix shared by a set of words.
 *
 * @param words The set of words to get the largest prefix from.
 * @return The greatest common prefix.//from w w  w  . jav a  2 s.com
 */
public static String getGreatestCommonPrefix(Collection<String> words) {
    if (null == words || 0 == words.size()) {
        throw new IllegalArgumentException(
                "Cannot build the greatest common prefix out of an empty set of words!");
    }

    String commonprefix = words.iterator().next();

    for (String w : words) {
        commonprefix = getCommonPrefix(commonprefix, w);
    }

    return commonprefix;
}

From source file:Main.java

/**
 * Determine the size of a specified collection.
 * /*from  ww  w.ja va2  s .  c om*/
 * @param collection - collection to determine the size of
 * @return size of the collection
 */
@SuppressWarnings("unchecked")
public static int size(Collection collection) {
    if (collection == null) {
        return 0;
    } else {
        return collection.size();
    }
}

From source file:Main.java

public static <T> int compareAsList(@Nonnull Comparator<? super T> elementComparator,
        @Nonnull Collection<? extends T> list1, @Nonnull Collection<? extends T> list2) {
    int res = Ints.compare(list1.size(), list2.size());
    if (res != 0)
        return res;
    Iterator<? extends T> elements2 = list2.iterator();
    for (T element1 : list1) {
        res = elementComparator.compare(element1, elements2.next());
        if (res != 0)
            return res;
    }//from   www.j  a v a2s  .c  om
    return 0;
}

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.
 *//*from   w ww  .  ja v  a2  s  .  c  o 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:com.enonic.cms.core.log.LogEntryKey.java

public static List<LogEntryKey> convertToList(Collection<String> collection) {
    if (collection == null || collection.size() == 0) {
        return null;
    }// www.  j  a v  a  2s  .c o m

    List<LogEntryKey> list = new ArrayList<LogEntryKey>(collection.size());
    for (String value : collection) {
        list.add(new LogEntryKey(value));

    }
    return list;
}

From source file:com.qwazr.utils.ArrayUtils.java

public static long[] toPrimitiveLong(Collection<Long> collection) {
    long[] array = new long[collection.size()];
    int i = 0;//from ww  w  . j  a  v a 2 s . com
    for (long val : collection)
        array[i++] = val;
    return array;
}