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.templates;
  
  import javax.xml.transform.TransformerException;
  
  import org.apache.xalan.transformer.TransformerImpl;
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.objects.XObject;
  
  /**
   * Handles the EXSLT result element within an EXSLT function element.
   */
  public class ElemExsltFuncResult extends ElemVariable
  {
      static final long serialVersionUID = -3478311949388304563L;
      /*
       * To keep the binary compatibility put those three private global 
       * variables back, although they are never used in this verison
       */
      // A flag indicating whether the return result is set
      private boolean m_isResultSet = false;
    
      // The return result
      private XObject m_result = null;
    
      // The frame size of the current caller
      private int m_callerFrameSize = 0;
   
    /**
     * Generate the EXSLT function return value, and assign it to the variable
     * index slot assigned for it in ElemExsltFunction compose().
     * 
     */
    public void execute(TransformerImpl transformer) throws TransformerException
    {    
      XPathContext context = transformer.getXPathContext();
  
      if (transformer.getDebug())
        transformer.getTraceManager().fireTraceEvent(this);
      
      // Verify that result has not already been set by another result
      // element. Recursion is allowed: intermediate results are cleared 
      // in the owner ElemExsltFunction execute().
      if (transformer.currentFuncResultSeen()) {
          throw new TransformerException("An EXSLT function cannot set more than one result!");
      }
  
      int sourceNode = context.getCurrentNode();
  
      // Set the return value;
      XObject var = getValue(transformer, sourceNode);
      transformer.popCurrentFuncResult();
      transformer.pushCurrentFuncResult(var);
  
      if (transformer.getDebug())
        transformer.getTraceManager().fireTraceEndEvent(this);    
    }
  
    /**
     * Get an integer representation of the element type.
     *
     * @return An integer representation of the element, defined in the
     *     Constants class.
     * @see org.apache.xalan.templates.Constants
     */
    public int getXSLToken()
    {
      return Constants.EXSLT_ELEMNAME_FUNCRESULT;
    }
    
    /**
     * Return the node name, defined in the
     *     Constants class.
     * @see org.apache.xalan.templates.Constants
     * @return The node name
     * 
     */
     public String getNodeName()
    {
      return Constants.EXSLT_ELEMNAME_FUNCRESULT_STRING;
    }
  }
  