NameNodeListImpl


1   /*
2    * The Apache Software License, Version 1.1
3    *
4    *
5    * Copyright (c) 1999,2000 The Apache Software Foundation.  All rights 
6    * reserved.
7    *
8    * Redistribution and use in source and binary forms, with or without
9    * modification, are permitted provided that the following conditions
10   * are met:
11   *
12   * 1. Redistributions of source code must retain the above copyright
13   *    notice, this list of conditions and the following disclaimer. 
14   *
15   * 2. Redistributions in binary form must reproduce the above copyright
16   *    notice, this list of conditions and the following disclaimer in
17   *    the documentation and/or other materials provided with the
18   *    distribution.
19   *
20   * 3. The end-user documentation included with the redistribution,
21   *    if any, must include the following acknowledgment:  
22   *       "This product includes software developed by the
23   *        Apache Software Foundation (http://www.apache.org/)."
24   *    Alternately, this acknowledgment may appear in the software itself,
25   *    if and wherever such third-party acknowledgments normally appear.
26   *
27   * 4. The names "Xerces" and "Apache Software Foundation" must
28   *    not be used to endorse or promote products derived from this
29   *    software without prior written permission. For written 
30   *    permission, please contact apache@apache.org.
31   *
32   * 5. Products derived from this software may not be called "Apache",
33   *    nor may "Apache" appear in their name, without prior written
34   *    permission of the Apache Software Foundation.
35   *
36   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
37   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
40   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46   * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47   * SUCH DAMAGE.
48   * ====================================================================
49   *
50   * This software consists of voluntary contributions made by many
51   * individuals on behalf of the Apache Software Foundation and was
52   * originally based on software copyright (c) 1999, International
53   * Business Machines, Inc., http://www.apache.org.  For more
54   * information on the Apache Software Foundation, please see
55   * <http://www.apache.org/>.
56   */
57  /*
58   * The Apache Software License, Version 1.1
59   *
60   *
61   * Copyright (c) 1999 The Apache Software Foundation.  All rights 
62   * reserved.
63   *
64   * Redistribution and use in source and binary forms, with or without
65   * modification, are permitted provided that the following conditions
66   * are met:
67   *
68   * 1. Redistributions of source code must retain the above copyright
69   *    notice, this list of conditions and the following disclaimer. 
70   *
71   * 2. Redistributions in binary form must reproduce the above copyright
72   *    notice, this list of conditions and the following disclaimer in
73   *    the documentation and/or other materials provided with the
74   *    distribution.
75   *
76   * 3. The end-user documentation included with the redistribution,
77   *    if any, must include the following acknowledgment:  
78   *       "This product includes software developed by the
79   *        Apache Software Foundation (http://www.apache.org/)."
80   *    Alternately, this acknowledgment may appear in the software itself,
81   *    if and wherever such third-party acknowledgments normally appear.
82   *
83   * 4. The names "Xerces" and "Apache Software Foundation" must
84   *    not be used to endorse or promote products derived from this
85   *    software without prior written permission. For written 
86   *    permission, please contact apache@apache.org.
87   *
88   * 5. Products derived from this software may not be called "Apache",
89   *    nor may "Apache" appear in their name, without prior written
90   *    permission of the Apache Software Foundation.
91   *
92   * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
93   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
94   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
95   * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
96   * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
98   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
99   * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
100  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
101  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
102  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
103  * SUCH DAMAGE.
104  * ====================================================================
105  *
106  * This software consists of voluntary contributions made by many
107  * individuals on behalf of the Apache Software Foundation and was
108  * originally based on software copyright (c) 1999, International
109  * Business Machines, Inc., http://www.apache.org.  For more
110  * information on the Apache Software Foundation, please see
111  * <http://www.apache.org/>.
112  */
113 
114 package org.enhydra.apache.html.dom;
115 
116 import org.enhydra.apache.xerces.dom.DeepNodeListImpl;
117 import org.enhydra.apache.xerces.dom.ElementImpl;
118 import org.enhydra.apache.xerces.dom.NodeImpl;
119 import org.w3c.dom.Node  ;
120 import org.w3c.dom.NodeList  ;
121 
122 /**
123  * This class implements the DOM's NodeList behavior for
124  * HTMLDocuemnt.getElementsByName().
125  *
126  * @version
127  * @since  PR-DOM-Level-1-19980818.
128  * @see DeepNodeListImpl
129  */
130 public class NameNodeListImpl 
131     extends DeepNodeListImpl
132     implements NodeList   {
133     
134     
135     /** Constructor. */
136     public NameNodeListImpl(NodeImpl rootNode, String   tagName) {
137     super( rootNode, tagName );
138     }  
139     
140 
141     /** 
142      * Iterative tree-walker. When you have a Parent link, there's often no
143      * need to resort to recursion. NOTE THAT only Element nodes are matched
144      * since we're specifically supporting getElementsByTagName().
145      */
146     protected Node   nextMatchingElementAfter(Node   current) {
147         
148         Node   next;
149         while (current != null) {
150             // Look down to first child.
151             if (current.hasChildNodes()) {
152                 current = (current.getFirstChild());
153             }
154             
155             // Look right to sibling (but not from root!)
156             else if (current != rootNode && null != (next = current.getNextSibling())) {
157                 current = next;
158             }
159             
160             // Look up and right (but not past root!)
161             else {
162                 next = null;
163                 for (; current != rootNode; // Stop when we return to starting point
164                      current = current.getParentNode()) {
165                     
166                     next = current.getNextSibling();
167                     if (next != null)
168                         break;
169                 }
170                 current = next;
171             }
172             
173             // Have we found an Element with the right tagName?
174             // ("*" matches anything.)
175             if (current != rootNode && current != null
176                 && current.getNodeType() ==  Node.ELEMENT_NODE  ) {
177                 String   name = ((ElementImpl) current).getAttribute( "name" );
178                 if ( name.equals("*") || name.equals(tagName))
179                     return current;
180             }
181             
182             // Otherwise continue walking the tree
183         }
184         
185         // Fell out of tree-walk; no more instances found
186         return null;
187         
188     } // nextMatchingElementAfter(int):Node
189     
190 } // class NameNodeListImpl
191
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