package picard.util;

import com.google.common.base.Optional;

import java.util.Iterator;

/**

* @author mccowan

*/

public class Iterators {

public static <E> AtomicIterator<E> atomicIteratorOf(final Iterable<E> backingIterable) {

return atomicIteratorOf(backingIterable.iterator());

}

public static <E> AtomicIterator<E> atomicIteratorOf(final Iterator<E> backingIterator) {

final Object monitor = new Object();

return new AtomicIterator<E>() {

@Override

public Optional<E> next() {

synchronized (monitor) {

return backingIterator.hasNext() ? Optional.fromNullable(backingIterator.next()) : Optional.<E>absent();

}

}

};

}

}