01: /**********************************************************************************
02: * $URL: https://source.sakaiproject.org/svn/archive/tags/sakai_2-4-1/import-impl/src/java/org/sakaiproject/importer/impl/XPathHelper.java $
03: * $Id: XPathHelper.java 17726 2006-11-01 15:39:28Z lance@indiana.edu $
04: ***********************************************************************************
05: *
06: * Copyright (c) 2006 The Sakai Foundation.
07: *
08: * Licensed under the Educational Community License, Version 1.0 (the "License");
09: * you may not use this file except in compliance with the License.
10: * You may obtain a copy of the License at
11: *
12: * http://www.opensource.org/licenses/ecl1.php
13: *
14: * Unless required by applicable law or agreed to in writing, software
15: * distributed under the License is distributed on an "AS IS" BASIS,
16: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17: * See the License for the specific language governing permissions and
18: * limitations under the License.
19: *
20: **********************************************************************************/package org.sakaiproject.importer.impl;
21:
22: import java.util.ArrayList;
23: import java.util.List;
24:
25: import org.jaxen.JaxenException;
26: import org.jaxen.XPath;
27: import org.jaxen.dom.DOMXPath;
28: import org.w3c.dom.Node;
29:
30: public class XPathHelper {
31:
32: public static List selectNodes(String expression, Object doc) {
33: if (doc == null)
34: return new ArrayList();
35: List nodes = null;
36: try {
37: XPath xpath = new DOMXPath(expression);
38: nodes = xpath.selectNodes(doc);
39: } catch (JaxenException e) {
40: return null;
41: }
42: return nodes;
43: }
44:
45: public static Node selectNode(String expression, Object doc) {
46: if (doc == null)
47: return null;
48: Object node = null;
49: try {
50: XPath xpath = new DOMXPath(expression);
51: node = xpath.selectSingleNode(doc);
52: } catch (JaxenException e) {
53: return null;
54: }
55: return (Node) node;
56: }
57:
58: public static String getNodeValue(String expression, Node node) {
59: if (node == null)
60: return "";
61: String value = null;
62: try {
63: XPath xpath = new DOMXPath(expression);
64: value = xpath.stringValueOf(node);
65: } catch (JaxenException e) {
66: return null;
67: }
68: return value;
69: }
70:
71: }
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