code: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements. See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership. The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the  "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  /*
   * $Id$
   */
  package org.apache.xalan.processor;
  
  import org.apache.xalan.templates.ElemExsltFuncResult;
  import org.apache.xalan.templates.ElemExsltFunction;
  import org.apache.xalan.templates.ElemParam;
  import org.apache.xalan.templates.ElemTemplateElement;
  import org.apache.xalan.templates.ElemVariable;
  
  import org.xml.sax.Attributes;
  import org.xml.sax.SAXException;
  
  /**
   * This class processes parse events for an exslt func:result element.
   * @xsl.usage internal
   */
  public class ProcessorExsltFuncResult extends ProcessorTemplateElem
  {
      static final long serialVersionUID = 6451230911473482423L;
    
    /**
     * Verify that the func:result element does not appear within a variable,
     * parameter, or another func:result, and that it belongs to a func:function 
     * element.
     */
    public void startElement(
            StylesheetHandler handler, String uri, String localName, String rawName, Attributes attributes)
              throws SAXException
    {
      String msg = "";
  
      super.startElement(handler, uri, localName, rawName, attributes);
      ElemTemplateElement ancestor = handler.getElemTemplateElement().getParentElem();
      while (ancestor != null && !(ancestor instanceof ElemExsltFunction))
      {
        if (ancestor instanceof ElemVariable 
            || ancestor instanceof ElemParam
            || ancestor instanceof ElemExsltFuncResult)
        {
          msg = "func:result cannot appear within a variable, parameter, or another func:result.";
          handler.error(msg, new SAXException(msg));
        }
        ancestor = ancestor.getParentElem();
      }
      if (ancestor == null)
      {
        msg = "func:result must appear in a func:function element";
        handler.error(msg, new SAXException(msg));
      }
    }
  }
  