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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.model.NodeIterator;
22 import org.apache.commons.jxpath.ri.model.NodePointer;
23 import org.w3c.dom.Attr;
24 import org.w3c.dom.Document;
25 import org.w3c.dom.NamedNodeMap;
26 import org.w3c.dom.Node;
27
28 /***
29 * An iterator of namespaces of a DOM Node.
30 *
31 * @author Dmitri Plotnikov
32 * @version $Revision: 1.9 $ $Date: 2004/04/01 02:55:32 $
33 */
34 public class DOMNamespaceIterator implements NodeIterator {
35 private NodePointer parent;
36 private List attributes;
37 private int position = 0;
38
39 public DOMNamespaceIterator(NodePointer parent) {
40 this.parent = parent;
41 attributes = new ArrayList();
42 collectNamespaces(attributes, (Node) parent.getNode());
43 }
44
45 private void collectNamespaces(List attributes, Node node) {
46 Node parent = node.getParentNode();
47 if (parent != null) {
48 collectNamespaces(attributes, parent);
49 }
50 if (node.getNodeType() == Node.DOCUMENT_NODE) {
51 node = ((Document) node).getDocumentElement();
52 }
53 if (node.getNodeType() == Node.ELEMENT_NODE) {
54 NamedNodeMap map = node.getAttributes();
55 int count = map.getLength();
56 for (int i = 0; i < count; i++) {
57 Attr attr = (Attr) map.item(i);
58 String prefix = DOMNodePointer.getPrefix(attr);
59 String name = DOMNodePointer.getLocalName(attr);
60 if ((prefix != null && prefix.equals("xmlns"))
61 || (prefix == null && name.equals("xmlns"))) {
62 attributes.add(attr);
63 }
64 }
65 }
66 }
67
68 public NodePointer getNodePointer() {
69 if (position == 0) {
70 if (!setPosition(1)) {
71 return null;
72 }
73 position = 0;
74 }
75 int index = position - 1;
76 if (index < 0) {
77 index = 0;
78 }
79 String prefix = "";
80 Attr attr = (Attr) attributes.get(index);
81 String name = attr.getPrefix();
82 if (name != null && name.equals("xmlns")) {
83 prefix = DOMNodePointer.getLocalName(attr);
84 }
85 return new NamespacePointer(parent, prefix, attr.getValue());
86 }
87
88 public int getPosition() {
89 return position;
90 }
91
92 public boolean setPosition(int position) {
93 this.position = position;
94 return position >= 1 && position <= attributes.size();
95 }
96 }