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: /*
17: * $Id: FuncLang.java,v 1.9 2004/08/17 19:25:36 jycli Exp $
18: */
19: package org.apache.xpath.functions;
20:
21: import org.apache.xml.dtm.DTM;
22: import org.apache.xpath.XPathContext;
23: import org.apache.xpath.objects.XBoolean;
24: import org.apache.xpath.objects.XObject;
25:
26: /**
27: * Execute the Lang() function.
28: * @xsl.usage advanced
29: */
30: public class FuncLang extends FunctionOneArg {
31: static final long serialVersionUID = -7868705139354872185L;
32:
33: /**
34: * Execute the function. The function must return
35: * a valid object.
36: * @param xctxt The current execution context.
37: * @return A valid XObject.
38: *
39: * @throws javax.xml.transform.TransformerException
40: */
41: public XObject execute(XPathContext xctxt)
42: throws javax.xml.transform.TransformerException {
43:
44: String lang = m_arg0.execute(xctxt).str();
45: int parent = xctxt.getCurrentNode();
46: boolean isLang = false;
47: DTM dtm = xctxt.getDTM(parent);
48:
49: while (DTM.NULL != parent) {
50: if (DTM.ELEMENT_NODE == dtm.getNodeType(parent)) {
51: int langAttr = dtm.getAttributeNode(parent,
52: "http://www.w3.org/XML/1998/namespace", "lang");
53:
54: if (DTM.NULL != langAttr) {
55: String langVal = dtm.getNodeValue(langAttr);
56: // %OPT%
57: if (langVal.toLowerCase().startsWith(
58: lang.toLowerCase())) {
59: int valLen = lang.length();
60:
61: if ((langVal.length() == valLen)
62: || (langVal.charAt(valLen) == '-')) {
63: isLang = true;
64: }
65: }
66:
67: break;
68: }
69: }
70:
71: parent = dtm.getParent(parent);
72: }
73:
74: return isLang ? XBoolean.S_TRUE : XBoolean.S_FALSE;
75: }
76: }
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