1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the  "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18/*
19 * $Id: ProcessorExsltFuncResult.java 468640 2006-10-28 06:53:53Z minchau $
20 */
21package org.apache.xalan.processor;
22
23import org.apache.xalan.templates.ElemExsltFuncResult;
24import org.apache.xalan.templates.ElemExsltFunction;
25import org.apache.xalan.templates.ElemParam;
26import org.apache.xalan.templates.ElemTemplateElement;
27import org.apache.xalan.templates.ElemVariable;
28
29import org.xml.sax.Attributes;
30import org.xml.sax.SAXException;
31
32/**
33 * This class processes parse events for an exslt func:result element.
34 * @xsl.usage internal
35 */
36public class ProcessorExsltFuncResult extends ProcessorTemplateElem
37{
38    static final long serialVersionUID = 6451230911473482423L;
39
40  /**
41   * Verify that the func:result element does not appear within a variable,
42   * parameter, or another func:result, and that it belongs to a func:function
43   * element.
44   */
45  public void startElement(
46          StylesheetHandler handler, String uri, String localName, String rawName, Attributes attributes)
47            throws SAXException
48  {
49    String msg = "";
50
51    super.startElement(handler, uri, localName, rawName, attributes);
52    ElemTemplateElement ancestor = handler.getElemTemplateElement().getParentElem();
53    while (ancestor != null && !(ancestor instanceof ElemExsltFunction))
54    {
55      if (ancestor instanceof ElemVariable
56          || ancestor instanceof ElemParam
57          || ancestor instanceof ElemExsltFuncResult)
58      {
59        msg = "func:result cannot appear within a variable, parameter, or another func:result.";
60        handler.error(msg, new SAXException(msg));
61      }
62      ancestor = ancestor.getParentElem();
63    }
64    if (ancestor == null)
65    {
66      msg = "func:result must appear in a func:function element";
67      handler.error(msg, new SAXException(msg));
68    }
69  }
70}
71