Source Code : Treat an Iterator as an Iterable

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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">
   * <p>Example of correct usage:</p>
   * <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;
          }
      };
  }

}

   
    
    
    
    
  

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