| /* |
| * Copyright 2006 Sun Microsystems, Inc. All Rights Reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Sun designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Sun in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| */ |
| |
| package com.sun.xml.internal.bind.v2.util; |
| |
| import java.util.Iterator; |
| import java.util.Map; |
| import java.util.NoSuchElementException; |
| |
| /** |
| * {@link Iterator} that walks over a map of maps. |
| * |
| * @author Kohsuke Kawaguchi |
| * @since 2.0 |
| */ |
| public final class FlattenIterator<T> implements Iterator<T> { |
| |
| private final Iterator<? extends Map<?,? extends T>> parent; |
| private Iterator<? extends T> child = null; |
| private T next; |
| |
| public FlattenIterator( Iterable<? extends Map<?,? extends T>> core ) { |
| this.parent = core.iterator(); |
| } |
| |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean hasNext() { |
| getNext(); |
| return next!=null; |
| } |
| |
| public T next() { |
| T r = next; |
| next = null; |
| if(r==null) |
| throw new NoSuchElementException(); |
| return r; |
| } |
| |
| private void getNext() { |
| if(next!=null) return; |
| |
| if(child!=null && child.hasNext()) { |
| next = child.next(); |
| return; |
| } |
| // child is empty |
| if(parent.hasNext()) { |
| child = parent.next().values().iterator(); |
| getNext(); |
| } |
| // else |
| // no more object |
| } |
| } |