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: FuncNamespace.java,v 1.11 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.XObject;
24: import org.apache.xpath.objects.XString;
25:
26: /**
27: * Execute the Namespace() function.
28: * @xsl.usage advanced
29: */
30: public class FuncNamespace extends FunctionDef1Arg {
31: static final long serialVersionUID = -4695674566722321237L;
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: int context = getArg0AsNode(xctxt);
45:
46: String s;
47: if (context != DTM.NULL) {
48: DTM dtm = xctxt.getDTM(context);
49: int t = dtm.getNodeType(context);
50: if (t == DTM.ELEMENT_NODE) {
51: s = dtm.getNamespaceURI(context);
52: } else if (t == DTM.ATTRIBUTE_NODE) {
53:
54: // This function always returns an empty string for namespace nodes.
55: // We check for those here. Fix inspired by Davanum Srinivas.
56:
57: s = dtm.getNodeName(context);
58: if (s.startsWith("xmlns:") || s.equals("xmlns"))
59: return XString.EMPTYSTRING;
60:
61: s = dtm.getNamespaceURI(context);
62: } else
63: return XString.EMPTYSTRING;
64: } else
65: return XString.EMPTYSTRING;
66:
67: return ((null == s) ? XString.EMPTYSTRING : new XString(s));
68: }
69: }
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