Mega Code Archive
Treat an Iterator as an Iterable
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import java.io.Serializable;
import java.util.AbstractMap;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Set;
/**
* @since 4.37
* @author Jaroslav Tulach
*/
public class Utils {
/**
* Treat an {@link Iterator} as an {@link Iterable} so it can be used in an enhanced for-loop.
* Bear in mind that the iterator is "consumed" by the loop and so should be used only once.
* Generally it is best to put the code which obtains the iterator inside the loop header.
* <div class="nonnormative">
* Example of correct usage:
* <pre>
* String text = ...;
* for (String token : NbCollections.iterable(new {@link java.util.Scanner}(text))) {
* // ...
* }
* </pre>
* </div>
* @param iterator an iterator
* @return an iterable wrapper which will traverse the iterator once
* @throws NullPointerException if the iterator is null
* @see <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6312085">Java bug #6312085</a>
* @see <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6360734">Java bug #6360734</a>
* @see <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4988624">Java bug #4988624</a>
* @since org.openide.util 7.5
*/
public static <E> Iterable<E> iterable(final Iterator<E> iterator) {
if (iterator == null) {
throw new NullPointerException();
}
return new Iterable<E>() {
public Iterator<E> iterator() {
return iterator;
}
};
}
}
]]>