Example usage for java.lang Iterable iterator

Introduction

In this page you can find the example usage for java.lang Iterable iterator.

Prototype

Iterator<T> iterator();

Source Link

Document

Returns an iterator over elements of type T .

Usage

From source file:Main.java

/**
 * Returns true if the given iterable is null or empty.
 *
 * @param   iterable/*from  ww  w  .  j  a v  a  2  s.  c om*/
 *      The iterable to determine if it is null or empty.
 * @return
 *      True if the given iterable is null or empty.
 */
public static boolean isEmpty(final Iterable<?> iterable) {
    if (iterable == null) {
        // It is null, so it is empty.
        return true;
    } else if (iterable instanceof Collection) {
        return ((Collection<?>) iterable).isEmpty();
    } else {
        return !iterable.iterator().hasNext();
    }
}

From source file:edu.byu.nlp.util.Iterables2.java

public static <E> Iterable<Enumeration<E>> enumerate(final Iterable<E> iterable) {
    return new Iterable<Enumeration<E>>() {

        @Override//from   w  ww  .j a  v  a  2s.  co  m
        public Iterator<Enumeration<E>> iterator() {
            return Iterators2.enumerate(iterable.iterator());
        }

    };
}

From source file:Main.java

/**
 * Returns the <code>index</code>-th value in the <code>iterable</code>'s {@link Iterator}, throwing
 * <code>IndexOutOfBoundsException</code> if there is no such element.
 * <p>// w w w  .jav  a 2 s .  c  om
 * If the {@link Iterable} is a {@link List}, then it will use {@link List#get(int)}.
 *
 * @param iterable  the {@link Iterable} to get a value from
 * @param index  the index to get
 * @param <T> the type of object in the {@link Iterable}.
 * @return the object at the specified index
 * @throws IndexOutOfBoundsException if the index is invalid
 */
public static <T> T get(final Iterable<T> iterable, final int index) {
    checkIndexBounds(index);
    if (iterable instanceof List<?>) {
        return ((List<T>) iterable).get(index);
    }
    return get(iterable.iterator(), index);
}

From source file:Main.java

/**
 * Returns the last element of the collection.
 * //  w  w  w  . jav  a2  s .  co  m
 * @param <T>
 *            the element type
 * @param iterable
 *            the collection
 * @return the last element or null if the list is empty
 */
public static <T> T last(Iterable<T> iterable) {
    if (iterable instanceof Deque<?>)
        return ((Deque<T>) iterable).getLast();
    if (iterable instanceof List<?>) {
        List<T> list = (List<T>) iterable;
        return list.isEmpty() ? null : list.get(list.size() - 1);
    }
    Iterator<T> iterator = iterable.iterator();
    T last = null;
    while (iterator.hasNext())
        last = iterator.next();
    return last;
}

From source file:com.github.rvesse.airline.utils.AirlineUtils.java

public static <T> List<T> unmodifiableListCopy(Iterable<T> iterable) {
    if (iterable == null)
        return Collections.emptyList();
    return ListUtils.unmodifiableList(IteratorUtils.toList(iterable.iterator()));
}

From source file:Main.java

/**
 * Returns an iterator over the values referenced by the elements of {@code
 * iterable}.// w  w  w.  j  a va  2  s  .c o  m
 *
 * @param trim true to remove reference objects from the iterable after
 *     their referenced values have been cleared.
 */
public static <T> Iterable<T> dereferenceIterable(final Iterable<? extends Reference<T>> iterable,
        final boolean trim) {
    return new Iterable<T>() {
        public Iterator<T> iterator() {
            return new Iterator<T>() {
                private final Iterator<? extends Reference<T>> delegate = iterable.iterator();
                private boolean removeIsOkay;
                private T next;

                private void computeNext() {
                    removeIsOkay = false;
                    while (next == null && delegate.hasNext()) {
                        next = delegate.next().get();
                        if (trim && next == null) {
                            delegate.remove();
                        }
                    }
                }

                @Override
                public boolean hasNext() {
                    computeNext();
                    return next != null;
                }

                @Override
                public T next() {
                    if (!hasNext()) {
                        throw new IllegalStateException();
                    }
                    T result = next;
                    removeIsOkay = true;
                    next = null;
                    return result;
                }

                public void remove() {
                    if (!removeIsOkay) {
                        throw new IllegalStateException();
                    }
                    delegate.remove();
                }
            };
        }
    };
}

From source file:com.networknt.light.server.DbService.java

public static long getCount(String className, Map<String, Object> criteria) {
    long count = 0;
    StringBuilder sql = new StringBuilder("SELECT COUNT(*) as count FROM ").append(className);
    String whereClause = DbService.getWhereClause(criteria);
    if (whereClause != null && whereClause.length() > 0) {
        sql.append(whereClause);//from   w  w w  .  j av a 2  s . c o m
    }
    logger.debug("sql={}", sql);
    OrientGraph graph = ServiceLocator.getInstance().getGraph();
    try {
        Iterable<Vertex> it = graph.command(new OCommandSQL(sql.toString())).execute();
        if (it != null) {
            Vertex v = it.iterator().next();
            count = v.getProperty("count");
        }
    } catch (Exception e) {
        logger.error("Exception:", e);
        throw e;
    } finally {
        graph.shutdown();
    }
    return count;
}

From source file:forge.deck.CardPool.java

public static CardPool fromCardList(final Iterable<String> lines) {
    CardPool pool = new CardPool();

    if (lines == null) {
        return pool;
    }/*ww w .  ja  v a2s . c  o m*/

    final Iterator<String> lineIterator = lines.iterator();
    while (lineIterator.hasNext()) {
        final String line = lineIterator.next();
        if (line.startsWith(";") || line.startsWith("#")) {
            continue;
        } // that is a comment or not-yet-supported card

        final Matcher m = p.matcher(line.trim());
        m.matches();
        final String sCnt = m.group(2);
        final String cardName = m.group(3);
        if (StringUtils.isBlank(cardName)) {
            continue;
        }

        final int count = sCnt == null ? 1 : Integer.parseInt(sCnt);
        pool.add(cardName, count);
    }
    return pool;
}

From source file:com.thoughtworks.studios.journey.utils.IterableUtils.java

public static <FROM, TO> Iterable<TO> flatMap(final Function<FROM, Iterable<TO>> function,
        Iterable<FROM> from) {
    Iterator<TO> iterator = Iterables.flatMap(new Function<FROM, Iterator<TO>>() {
        @Override//ww w  .  j  a  v a2  s .c  o  m
        public Iterator<TO> apply(FROM o) {
            return function.apply(o).iterator();
        }
    }, from.iterator());
    return toIterable(iterator);
}

From source file:com.github.rvesse.airline.utils.AirlineUtils.java

public static <T> Set<T> unmodifiableSetCopy(Iterable<T> iterable) {
    if (iterable == null)
        return Collections.emptySet();
    LinkedHashSet<T> set = new LinkedHashSet<T>();
    Iterator<T> iter = iterable.iterator();
    while (iter.hasNext()) {
        set.add(iter.next());/*from w  ww  .  j a  v a 2  s.  c  o  m*/
    }
    return Collections.unmodifiableSet(set);
}