1 /* ====================================================================
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 2000 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution,
20 * if any, must include the following acknowledgment:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowledgment may appear in the software itself,
24 * if and wherever such third-party acknowledgments normally appear.
25 *
26 * 4. The names "Apache" and "Apache Software Foundation" must
27 * not be used to endorse or promote products derived from this
28 * software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache",
32 * nor may "Apache" appear in their name, without prior written
33 * permission of the Apache Software Foundation.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>;.
53 *
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
57 */
58
59 package net.sourceforge.jane.jjtree;
60
61 import net.sourceforge.jane.util.ExtendedEnumeration;
62
63 import org.apache.commons.collections.Predicate;
64
65 /***
66 * A enumeration object that enumerates over the child of a particular node.
67 */
68 public class NodeEnumeration extends ExtendedEnumeration
69 {
70 private int index;
71 private Node parent;
72
73 /***
74 * Create a new <code>NodeEnumeration</code>.
75 */
76 public NodeEnumeration(Node aParent, final Class aMatch)
77 {
78 super(new Predicate() {
79 public boolean evaluate(Object obj) {
80 return aMatch.equals(obj.getClass());
81 }
82 });
83 index = 0;
84 parent = aParent;
85 }
86
87 /***
88 * Returns <code>true</code> if there are more nodes.
89 */
90 public boolean hasMoreNodes()
91 {
92 return hasMoreElements();
93 }
94
95 /***
96 * Returns the next node.
97 */
98 public Node nextNode()
99 {
100 return (Node) nextElement();
101 }
102
103 /***
104 * Reset this enumeration to the beginning.
105 */
106 public void reset()
107 {
108 index = 0;
109 }
110
111 /***
112 * Returns <code>true</code> if there are not more elements in the
113 * current series.
114 */
115 protected boolean doCheckSize()
116 {
117 return index < parent.jjtGetNumChildren();
118 }
119
120 /***
121 * Returns the current element.
122 */
123 protected Object getCurrent()
124 {
125 return parent.jjtGetChild(index);
126 }
127
128 /***
129 * Go to the next element.
130 */
131 protected void doNext()
132 {
133 index++;
134 }
135
136 }
137
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