01: /*
02: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
03: *
04: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
05: *
06: * The contents of this file are subject to the terms of either the GNU
07: * General Public License Version 2 only ("GPL") or the Common Development
08: * and Distribution License("CDDL") (collectively, the "License"). You
09: * may not use this file except in compliance with the License. You can obtain
10: * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
11: * or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
12: * language governing permissions and limitations under the License.
13: *
14: * When distributing the software, include this License Header Notice in each
15: * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
16: * Sun designates this particular file as subject to the "Classpath" exception
17: * as provided by Sun in the GPL Version 2 section of the License file that
18: * accompanied this code. If applicable, add the following below the License
19: * Header, with the fields enclosed by brackets [] replaced by your own
20: * identifying information: "Portions Copyrighted [year]
21: * [name of copyright owner]"
22: *
23: * Contributor(s):
24: *
25: * If you wish your version of this file to be governed by only the CDDL or
26: * only the GPL Version 2, indicate your decision by adding "[Contributor]
27: * elects to include this software in this distribution under the [CDDL or GPL
28: * Version 2] license." If you don't indicate a single choice of license, a
29: * recipient has the option to distribute your version of this file under
30: * either the CDDL, the GPL Version 2 or to extend the choice of license to
31: * its licensees as provided above. However, if you add GPL Version 2 code
32: * and therefore, elected the GPL Version 2 license, then the option applies
33: * only if the new code is made subject to such option by the copyright
34: * holder.
35: */
36:
37: package com.sun.xml.bind.v2.util;
38:
39: import java.util.Iterator;
40: import java.util.Map;
41: import java.util.NoSuchElementException;
42:
43: /**
44: * {@link Iterator} that walks over a map of maps.
45: *
46: * @author Kohsuke Kawaguchi
47: * @since 2.0
48: */
49: public final class FlattenIterator<T> implements Iterator<T> {
50:
51: private final Iterator<? extends Map<?, ? extends T>> parent;
52: private Iterator<? extends T> child = null;
53: private T next;
54:
55: public FlattenIterator(Iterable<? extends Map<?, ? extends T>> core) {
56: this .parent = core.iterator();
57: }
58:
59: public void remove() {
60: throw new UnsupportedOperationException();
61: }
62:
63: public boolean hasNext() {
64: getNext();
65: return next != null;
66: }
67:
68: public T next() {
69: T r = next;
70: next = null;
71: if (r == null)
72: throw new NoSuchElementException();
73: return r;
74: }
75:
76: private void getNext() {
77: if (next != null)
78: return;
79:
80: if (child != null && child.hasNext()) {
81: next = child.next();
82: return;
83: }
84: // child is empty
85: if (parent.hasNext()) {
86: child = parent.next().values().iterator();
87: getNext();
88: }
89: // else
90: // no more object
91: }
92: }
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