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Java > Open Source Codes > org > apache > xpath > functions > FuncGenerateId


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
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 1.10 2004/02/17 04:34:01 minchau 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 {
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) throws javax.xml.transform.TransformerException JavaDoc
42   {
43
44     int which = getArg0AsNode(xctxt);
45
46     if (DTM.NULL != which)
47     {
48       // Note that this is a different value than in previous releases
49 // of Xalan. It's sensitive to the exact encoding of the node
50 // handle anyway, so fighting to maintain backward compatability
51 // really didn't make sense; it may change again as we continue
52 // to experiment with balancing document and node numbers within
53 // that value.
54 return new XString("N" + Integer.toHexString(which).toUpperCase());
55     }
56     else
57       return XString.EMPTYSTRING;
58   }
59 }
60
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