Utils.java Source code

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Here is the source code for Utils.java

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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common
 * Development and Distribution License("CDDL") (collectively, the
 * "License"). You may not use this file except in compliance with the
 * License. You can obtain a copy of the License at
 * http://www.netbeans.org/cddl-gplv2.html
 * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
 * specific language governing permissions and limitations under the
 * License.  When distributing the software, include this License Header
 * Notice in each file and include the License file at
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 * particular file as subject to the "Classpath" exception as provided
 * by Sun in the GPL Version 2 section of the License file that
 * accompanied this code. If applicable, add the following below the
 * License Header, with the fields enclosed by brackets [] replaced by
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 * "Portions Copyrighted [year] [name of copyright owner]"
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 * Contributor(s):
 *
 * The Original Software is NetBeans. The Initial Developer of the Original
 * Software is Sun Microsystems, Inc. Portions Copyright 1997-2006 Sun
 * Microsystems, Inc. All Rights Reserved.
 *
 * If you wish your version of this file to be governed by only the CDDL
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 * "[Contributor] elects to include this software in this distribution
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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;
            }
        };
    }

}