Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
PrecedingSiblingAxisIterator |
|
| 2.6;2.6 |
1 | /* | |
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/util/PrecedingSiblingAxisIterator.java,v 1.16 2006/11/13 22:10:09 elharo Exp $ | |
3 | * $Revision: 1.16 $ | |
4 | * $Date: 2006/11/13 22:10:09 $ | |
5 | * | |
6 | * ==================================================================== | |
7 | * | |
8 | * Copyright 2000-2002 bob mcwhirter & James Strachan. | |
9 | * All rights reserved. | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions are | |
13 | * met: | |
14 | * | |
15 | * * Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * | |
18 | * * Redistributions in binary form must reproduce the above copyright | |
19 | * notice, this list of conditions and the following disclaimer in the | |
20 | * documentation and/or other materials provided with the distribution. | |
21 | * | |
22 | * * Neither the name of the Jaxen Project nor the names of its | |
23 | * contributors may be used to endorse or promote products derived | |
24 | * from this software without specific prior written permission. | |
25 | * | |
26 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
27 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | |
28 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A | |
29 | * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER | |
30 | * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
31 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
32 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
33 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
34 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
35 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
36 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
37 | * | |
38 | * ==================================================================== | |
39 | * This software consists of voluntary contributions made by many | |
40 | * individuals on behalf of the Jaxen Project and was originally | |
41 | * created by bob mcwhirter <bob@werken.com> and | |
42 | * James Strachan <jstrachan@apache.org>. For more information on the | |
43 | * Jaxen Project, please see <http://www.jaxen.org/>. | |
44 | * | |
45 | * $Id: PrecedingSiblingAxisIterator.java,v 1.16 2006/11/13 22:10:09 elharo Exp $ | |
46 | */ | |
47 | ||
48 | ||
49 | ||
50 | package org.jaxen.util; | |
51 | ||
52 | import java.util.Iterator; | |
53 | import java.util.LinkedList; | |
54 | import java.util.NoSuchElementException; | |
55 | ||
56 | import org.jaxen.JaxenConstants; | |
57 | import org.jaxen.Navigator; | |
58 | import org.jaxen.UnsupportedAxisException; | |
59 | ||
60 | /** | |
61 | * | |
62 | * Represents the XPath <code>preceding-sibling</code> axis. | |
63 | * The "<code>preceding-sibling</code> axis contains all the | |
64 | * preceding siblings of the context node; if the context node is an | |
65 | * attribute node or namespace node, the <code>preceding-sibling</code> | |
66 | * axis is empty." | |
67 | * | |
68 | * @version 1.2b12 | |
69 | * | |
70 | */ | |
71 | public class PrecedingSiblingAxisIterator implements Iterator | |
72 | { | |
73 | private Object contextNode; | |
74 | private Navigator navigator; | |
75 | ||
76 | private Iterator siblingIter; | |
77 | private Object nextObj; | |
78 | ||
79 | /** | |
80 | * Create a new <code>preceding-sibling</code> axis iterator. | |
81 | * | |
82 | * @param contextNode the node to start from | |
83 | * @param navigator the object model specific navigator | |
84 | */ | |
85 | public PrecedingSiblingAxisIterator(Object contextNode, | |
86 | Navigator navigator) throws UnsupportedAxisException | |
87 | 536 | { |
88 | 536 | this.contextNode = contextNode; |
89 | 536 | this.navigator = navigator; |
90 | ||
91 | 536 | init(); |
92 | 536 | if ( siblingIter.hasNext() ) |
93 | { | |
94 | 152 | this.nextObj = siblingIter.next(); |
95 | } | |
96 | 536 | } |
97 | ||
98 | private void init() throws UnsupportedAxisException | |
99 | { | |
100 | ||
101 | 536 | Object parent = this.navigator.getParentNode( this.contextNode ); |
102 | ||
103 | 536 | if ( parent != null ) |
104 | { | |
105 | 376 | Iterator childIter = this.navigator.getChildAxisIterator( parent ); |
106 | 376 | LinkedList siblings = new LinkedList(); |
107 | ||
108 | 860 | while ( childIter.hasNext() ) |
109 | { | |
110 | 860 | Object eachChild = childIter.next(); |
111 | 860 | if ( eachChild.equals(this.contextNode) ) |
112 | { | |
113 | 376 | break; |
114 | } | |
115 | 484 | siblings.addFirst( eachChild ); |
116 | 484 | } |
117 | ||
118 | 376 | this.siblingIter = siblings.iterator(); |
119 | ||
120 | 376 | } |
121 | else { | |
122 | 160 | this.siblingIter = JaxenConstants.EMPTY_ITERATOR; |
123 | } | |
124 | ||
125 | 536 | } |
126 | ||
127 | /** | |
128 | * Returns true if there are any preceding siblings remaining; false otherwise. | |
129 | * | |
130 | * @return true if any preceding siblings remain; false otherwise | |
131 | * | |
132 | * @see java.util.Iterator#hasNext() | |
133 | */ | |
134 | public boolean hasNext() | |
135 | { | |
136 | 1538 | return ( this.nextObj != null ); |
137 | } | |
138 | ||
139 | /** | |
140 | * Returns the next preceding sibling. | |
141 | * | |
142 | * @return the next preceding sibling | |
143 | * | |
144 | * @throws NoSuchElementException if no preceding siblings remain | |
145 | * | |
146 | * @see java.util.Iterator#next() | |
147 | */ | |
148 | public Object next() throws NoSuchElementException | |
149 | { | |
150 | 486 | if ( ! hasNext() ) |
151 | { | |
152 | 2 | throw new NoSuchElementException(); |
153 | } | |
154 | ||
155 | 484 | Object obj = this.nextObj; |
156 | 484 | if ( siblingIter.hasNext() ) |
157 | { | |
158 | 332 | this.nextObj = siblingIter.next(); |
159 | 332 | } |
160 | else { | |
161 | 152 | this.nextObj = null; |
162 | } | |
163 | 484 | return obj; |
164 | } | |
165 | ||
166 | /** | |
167 | * This operation is not supported. | |
168 | * | |
169 | * @throws UnsupportedOperationException | |
170 | */ | |
171 | public void remove() throws UnsupportedOperationException | |
172 | { | |
173 | 2 | throw new UnsupportedOperationException(); |
174 | } | |
175 | ||
176 | } |