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16 package org.apache.commons.jxpath.ri.model.dom;
17
18 import java.util.ArrayList  ;
19 import java.util.List ;
20
21 import org.apache.commons.jxpath.ri.QName;
22 import org.apache.commons.jxpath.ri.model.NodeIterator;
23 import org.apache.commons.jxpath.ri.model.NodePointer;
24 import org.w3c.dom.Attr ;
25 import org.w3c.dom.Element ;
26 import org.w3c.dom.NamedNodeMap ;
27 import org.w3c.dom.Node ;
28
29
35 public class DOMAttributeIterator implements NodeIterator {
36 private NodePointer parent;
37 private QName name;
38 private List attributes;
39 private int position = 0;
40
41 public DOMAttributeIterator(NodePointer parent, QName name) {
42 this.parent = parent;
43 this.name = name;
44 attributes = new ArrayList ();
45 Node node = (Node ) parent.getNode();
46 if (node.getNodeType() == Node.ELEMENT_NODE) {
47 String lname = name.getName();
48 if (!lname.equals("*")) {
49 Attr attr = getAttribute((Element ) node, name);
50 if (attr != null) {
51 attributes.add(attr);
52 }
53 }
54 else {
55 NamedNodeMap map = node.getAttributes();
56 int count = map.getLength();
57 for (int i = 0; i < count; i++) {
58 Attr attr = (Attr ) map.item(i);
59 if (testAttr(attr, name)) {
60 attributes.add(attr);
61 }
62 }
63 }
64 }
65 }
66
67 private boolean testAttr(Attr attr, QName testName) {
68 String nodePrefix = DOMNodePointer.getPrefix(attr);
69 String nodeLocalName = DOMNodePointer.getLocalName(attr);
70
71 if (nodePrefix != null && nodePrefix.equals("xmlns")) {
72 return false;
73 }
74
75 if (nodePrefix == null && nodeLocalName.equals("xmlns")) {
76 return false;
77 }
78
79 String testLocalName = name.getName();
80 if (testLocalName.equals("*") || testLocalName.equals(nodeLocalName)) {
81 String testPrefix = testName.getPrefix();
82
83 if (equalStrings(testPrefix, nodePrefix)) {
84 return true;
85 }
86
87 String testNS = null;
88 if (testPrefix != null) {
89 testNS = parent.getNamespaceURI(testPrefix);
90 }
91
92 String nodeNS = null;
93 if (nodePrefix != null) {
94 nodeNS = parent.getNamespaceURI(nodePrefix);
95 }
96 return equalStrings(testNS, nodeNS);
97 }
98 return false;
99 }
100
101 private static boolean equalStrings(String s1, String s2) {
102 if (s1 == null && s2 != null) {
103 return false;
104 }
105 if (s1 != null && !s1.equals(s2)) {
106 return false;
107 }
108 return true;
109 }
110
111 private Attr getAttribute(Element element, QName name) {
112 String testPrefix = name.getPrefix();
113 String testNS = null;
114
115 if (testPrefix != null) {
116 testNS = parent.getNamespaceURI(testPrefix);
117 }
118
119 if (testNS != null) {
120 Attr attr = element.getAttributeNodeNS(testNS, name.getName());
121 if (attr != null) {
122 return attr;
123 }
124
125 NamedNodeMap nnm = element.getAttributes();
129 for (int i = 0; i < nnm.getLength(); i++) {
130 attr = (Attr ) nnm.item(i);
131 if (testAttr(attr, name)) {
132 return attr;
133 }
134 }
135 return null;
136 }
137 else {
138 return element.getAttributeNode(name.getName());
139 }
140 }
141
142 public NodePointer getNodePointer() {
143 if (position == 0) {
144 if (!setPosition(1)) {
145 return null;
146 }
147 position = 0;
148 }
149 int index = position - 1;
150 if (index < 0) {
151 index = 0;
152 }
153 return new DOMAttributePointer(parent, (Attr ) attributes.get(index));
154 }
155
156 public int getPosition() {
157 return position;
158 }
159
160 public boolean setPosition(int position) {
161 this.position = position;
162 return position >= 1 && position <= attributes.size();
163 }
164 } |
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