01: /*
02: * Copyright 1999-2004 The Apache Software Foundation
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
10: * Unless required by applicable law or agreed to in writing, software
11: * distributed under the License is distributed on an "AS IS" BASIS,
12: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13: * See the License for the specific language governing permissions and
14: * limitations under the License.
15: */
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: }
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