01: /*
02: * This file is part of PFIXCORE.
03: *
04: * PFIXCORE is free software; you can redistribute it and/or modify
05: * it under the terms of the GNU Lesser General Public License as published by
06: * the Free Software Foundation; either version 2 of the License, or
07: * (at your option) any later version.
08: *
09: * PFIXCORE is distributed in the hope that it will be useful,
10: * but WITHOUT ANY WARRANTY; without even the implied warranty of
11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12: * GNU Lesser General Public License for more details.
13: *
14: * You should have received a copy of the GNU Lesser General Public License
15: * along with PFIXCORE; if not, write to the Free Software
16: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17: *
18: */
19:
20: package de.schlund.pfixxml.util;
21:
22: import java.util.ArrayList;
23: import java.util.List;
24:
25: import javax.xml.transform.TransformerException;
26: import javax.xml.xpath.XPathConstants;
27: import javax.xml.xpath.XPathException;
28: import javax.xml.xpath.XPathFactory;
29: import javax.xml.xpath.XPathFactoryConfigurationException;
30:
31: import org.w3c.dom.Node;
32: import org.w3c.dom.NodeList;
33:
34: import com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl;
35:
36: /**
37: * @author mleidig@schlund.de
38: */
39: public class XPathDefault implements XPathSupport {
40:
41: XPathFactory xpathFactory = new XPathFactoryImpl();
42:
43: public boolean isModelSupported(Node node) {
44: return true;
45: }
46:
47: public List<Node> select(Node context, String xpath)
48: throws TransformerException {
49: NodeList nodes = selectNodes(context, xpath);
50: List<Node> nodeList = new ArrayList<Node>();
51: for (int i = 0; i < nodes.getLength(); i++) {
52: nodeList.add(nodes.item(i));
53: }
54: return nodeList;
55: }
56:
57: public boolean test(Node context, String test)
58: throws TransformerException {
59: try {
60: javax.xml.xpath.XPath xp = createXPath();
61: Boolean res = (Boolean) xp.evaluate(test, context,
62: XPathConstants.BOOLEAN);
63: return res.booleanValue();
64: } catch (XPathException x) {
65: throw new TransformerException("XPath error", x);
66: }
67: }
68:
69: private NodeList selectNodes(Node context, String xpath)
70: throws TransformerException {
71: try {
72: javax.xml.xpath.XPath xp = createXPath();
73: NodeList res = (NodeList) xp.evaluate(xpath, context,
74: XPathConstants.NODESET);
75: return res;
76: } catch (XPathException x) {
77: throw new TransformerException("XPath error", x);
78: }
79: }
80:
81: private javax.xml.xpath.XPath createXPath()
82: throws XPathFactoryConfigurationException {
83: synchronized (xpathFactory) {
84: return xpathFactory.newXPath();
85: }
86: }
87:
88: }
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