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: FuncGenerateId.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 GenerateId() function.
28: * @xsl.usage advanced
29: */
30: public class FuncGenerateId extends FunctionDef1Arg {
31: static final long serialVersionUID = 973544842091724273L;
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 which = getArg0AsNode(xctxt);
45:
46: if (DTM.NULL != which) {
47: // Note that this is a different value than in previous releases
48: // of Xalan. It's sensitive to the exact encoding of the node
49: // handle anyway, so fighting to maintain backward compatability
50: // really didn't make sense; it may change again as we continue
51: // to experiment with balancing document and node numbers within
52: // that value.
53: return new XString("N"
54: + Integer.toHexString(which).toUpperCase());
55: } else
56: return XString.EMPTYSTRING;
57: }
58: }
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