1/*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5/*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements.  See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License.  You may obtain a copy of the License at
12 *
13 *      http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22package com.sun.org.apache.xpath.internal.functions;
23
24import com.sun.org.apache.xml.internal.dtm.DTM;
25import com.sun.org.apache.xpath.internal.XPathContext;
26import com.sun.org.apache.xpath.internal.objects.XObject;
27import com.sun.org.apache.xpath.internal.objects.XString;
28
29/**
30 * Execute the GenerateId() function.
31 * @xsl.usage advanced
32 */
33public class FuncGenerateId extends FunctionDef1Arg
34{
35    static final long serialVersionUID = 973544842091724273L;
36
37  /**
38   * Execute the function.  The function must return
39   * a valid object.
40   * @param xctxt The current execution context.
41   * @return A valid XObject.
42   *
43   * @throws javax.xml.transform.TransformerException
44   */
45  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
46  {
47
48    int which = getArg0AsNode(xctxt);
49
50    if (DTM.NULL != which)
51    {
52      // Note that this is a different value than in previous releases
53      // of Xalan. It's sensitive to the exact encoding of the node
54      // handle anyway, so fighting to maintain backward compatability
55      // really didn't make sense; it may change again as we continue
56      // to experiment with balancing document and node numbers within
57      // that value.
58      return new XString("N" + Integer.toHexString(which).toUpperCase());
59    }
60    else
61      return XString.EMPTYSTRING;
62  }
63}
64