CombinedIterator Class — netty Architecture

Source Code

transport/src/main/java/io/netty/channel/group/CombinedIterator.java lines 25–72

final class CombinedIterator<E> implements Iterator<E> {

    private final Iterator<E> i1;
    private final Iterator<E> i2;
    private Iterator<E> currentIterator;

    CombinedIterator(Iterator<E> i1, Iterator<E> i2) {
        this.i1 = ObjectUtil.checkNotNull(i1, "i1");
        this.i2 = ObjectUtil.checkNotNull(i2, "i2");
        this.currentIterator = i1;
    }

    @Override
    public boolean hasNext() {
        for (;;) {
            if (currentIterator.hasNext()) {
                return true;
            }

            if (currentIterator == i1) {
                currentIterator = i2;
            } else {
                return false;
            }
        }
    }

    @Override
    public E next() {
        for (;;) {
            try {
                return currentIterator.next();
            } catch (NoSuchElementException e) {
                if (currentIterator == i1) {
                    currentIterator = i2;
                } else {
                    throw e;
                }
            }
        }
    }

    @Override
    public void remove() {
        currentIterator.remove();
    }

}