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:com.github.steveash.jg2p.util.Zipper.java

public static <A, B> List<Pair<A, B>> up(Iterable<A> a, Iterable<B> b) {
    ArrayList<Pair<A, B>> result = Lists.newArrayList();
    Iterator<A> iterA = a.iterator();
    Iterator<B> iterB = b.iterator();
    while (iterA.hasNext()) {
        Preconditions.checkArgument(iterB.hasNext(), "B is shorter than A, must be same size");
        A aa = iterA.next();//from   w w  w.j a  va  2  s . c o  m
        B bb = iterB.next();
        result.add(Pair.of(aa, bb));
    }
    Preconditions.checkArgument(!iterB.hasNext(), "A is shorter than B, must be same size");
    return result;
}

From source file:Main.java

/**
 * Pick all elements from the iterable {@literal items} and convert their string representation into a
 * {@literal separator}-separated single string.
 *
 * @param items     The source item collection
 * @param separator   The separator string between items
 * <p/>//from   w w w .java2s  .  c o  m
 * @return A String containing the concatenated string representations of the elements in {@literal items}.
 */
public static String join(final Iterable<?> items, final String separator) {
    final StringBuilder sequence = new StringBuilder();
    final Iterator<?> iter = items.iterator();
    if (iter.hasNext()) {
        final String first = iter.next().toString();
        sequence.append(first);
        while (iter.hasNext()) {
            sequence.append(separator);
            final String next = iter.next().toString();
            sequence.append(next);
        }
    }
    return sequence.toString();
}

From source file:net.daboross.bukkitdev.skywars.gist.GistReport.java

public static String joinText(Iterable<String> iterable) {
    Iterator<String> iterator = iterable.iterator();
    if (!iterator.hasNext()) {
        return "";
    }/*from ww w . ja  v  a2  s.  co  m*/
    StringBuilder builder = new StringBuilder(iterator.next());
    while (iterator.hasNext()) {
        builder.append("\n").append(iterator.next());
    }
    return builder.toString();
}

From source file:Main.java

public static <E> ArrayList<E> newArrayList(Iterable<E> iterable) {
    if (iterable == null) {
        throw new NullPointerException();
    }/*from  w  w  w .j av  a2 s.c  o m*/
    ArrayList<E> list = new ArrayList<E>();
    for (Iterator<E> i = iterable.iterator(); i.hasNext();) {
        list.add(i.next());
    }
    return list;
}

From source file:com.github.steveash.jg2p.util.Zipper.java

public static <A, B> List<Pair<A, B>> replaceRight(List<Pair<A, B>> original, Iterable<B> newRight) {
    ArrayList<Pair<A, B>> result = Lists.newArrayListWithCapacity(original.size());
    Iterator<B> iter = newRight.iterator();
    for (Pair<A, B> pair : original) {
        Preconditions.checkArgument(iter.hasNext(), "newRight is smaller than original");
        result.add(Pair.of(pair.getLeft(), iter.next()));
    }//from  ww  w. j  av  a 2  s.com
    Preconditions.checkArgument(!iter.hasNext(), "newRight is bigger than original");
    return result;
}

From source file:net.dontdrinkandroot.utils.collections.CollectionUtils.java

public static <T> T first(Iterable<T> iterable) {

    return iterable.iterator().next();
}

From source file:Main.java

/**
 * writes the objects in iterable to the returned String, separating them with the given separator.
 * String.valueOf() is used to write each element of the collection.
 * @param iterable/*  w w  w. ja  va  2  s. c o  m*/
 * @param sSeparator if non-empty, is written between each two elements (that is, not before the first one, and not after the last one)
 * @param sPrefix if non-empty, is prepended before each element.
 * @param sSuffix if non-empty, is appended after each element.
 * @return a String containing the String representations of the given Collection's elements.
 * @precondition iterable != null
 * @postcondition result != null
 */
public static String getSeparatedList(Iterable<?> iterable, String sSeparator, String sPrefix, String sSuffix) {
    final StringBuilder sb = new StringBuilder();
    for (Iterator<?> iter = iterable.iterator(); iter.hasNext();) {
        // prefix:
        if (sPrefix != null) {
            sb.append(sPrefix);
        }
        // the element itself:
        sb.append(iter.next());
        // suffix:
        if (sSuffix != null) {
            sb.append(sSuffix);
        }
        // separator:
        if (sSeparator != null && iter.hasNext()) {
            sb.append(sSeparator);
        }
    }
    return sb.toString();
}

From source file:fr.lirmm.graphik.util.MathUtils.java

/**
 * Comput the cartesian product of the specified set with itself.
 * input: { A, B, C }//  w w w  .java2 s  .  co m
 * output : { (A,A), (A,B), (B,B) } 
 * @param set
 * @return
 */
public static <T> Iterable<Pair<T, T>> selfCartesianProduct(Iterable<T> set) {
    Collection<Pair<T, T>> pairs = new LinkedList<Pair<T, T>>();

    Iterator<T> it = set.iterator();
    while (it.hasNext()) {
        T a = it.next();
        for (T b : set) {
            pairs.add(new ImmutablePair<T, T>(a, b));
        }

        if (it.hasNext()) { // FIXfor singleton implementation
            it.remove();
        }
    }
    return pairs;
}

From source file:com.insightml.utils.ui.UiUtils.java

private static String toString(final Iterable<?> list) {
    if (!list.iterator().hasNext()) {
        return "Empty List";
    }/*from   w  w  w  . ja va 2s .  com*/
    final StringBuilder builder = new StringBuilder();
    int maxFirst = 30;
    for (final Object entry : list) {
        if (entry instanceof Triple) {
            maxFirst = Math.max(maxFirst, ((Triple<?, ?, ?>) entry).getFirst().toString().length());
        }
    }
    for (final Object entry : list) {
        if (entry instanceof Triple) {
            builder.append(fill(((Triple<?, ?, ?>) entry).getFirst(), maxFirst + 10));
            builder.append(fill(((Triple<?, ?, ?>) entry).getSecond(), 30));
            builder.append(((Triple<?, ?, ?>) entry).getThird());
        } else {
            builder.append(format(entry));
        }
        builder.append('\n');
    }
    return builder.toString();
}

From source file:Main.java

/**
 * Get the first element of the passed iterable.
 *
 * @param <ELEMENTTYPE>/*w  ww  . j  av a 2 s. c o  m*/
 *        Iterable element type
 * @param aIterable
 *        The iterable. May be <code>null</code>.
 * @return <code>null</code> if the iterable is <code>null</code> or empty,
 *         the first element otherwise.
 */
@Nullable
public static <ELEMENTTYPE> ELEMENTTYPE getFirstElement(@Nullable final Iterable<ELEMENTTYPE> aIterable) {
    if (aIterable == null)
        return null;
    final Iterator<ELEMENTTYPE> it = aIterable.iterator();
    return it.hasNext() ? it.next() : null;
}