src/org/apache/xalan/templates/FuncCurrentGroup.java

/*
 * The Apache Software License, Version 1.1
 *
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xalan" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation and was
 * originally based on software copyright (c) 1999, Lotus
 * Development Corporation., http://www.lotus.com.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */
package org.apache.xalan.templates;

import java.util.Vector;

import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xpath.functions.Function;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XObject;
import org.apache.xpath.objects.XNodeSet;
import org.apache.xpath.objects.XSequenceImpl;
import org.apache.xpath.objects.XSequence;
import org.apache.xpath.VariableComposeState;
import org.apache.xpath.XPath;
import org.apache.xpath.Expression;
import org.apache.xpath.functions.WrongNumberArgsException;
import org.apache.xalan.res.XSLMessages;
import org.apache.xalan.res.XSLTErrorResources;

import org.w3c.dom.Node;

import javax.xml.transform.TransformerException;
import javax.xml.transform.ErrorListener;
import org.apache.xml.utils.SAXSourceLocator;

/**
 * <meta name="usage" content="advanced"/>
 * Execute the FormatNumber() function.
 */
public class FuncCurrentGroup extends Function
{

  /**
   * Execute the function.  The function must return
   * a valid object.
   * @param xctxt The current execution context.
   * @return A valid XObject.
   *
   * @throws javax.xml.transform.TransformerException
   */
  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
  {

    // A bit of an ugly hack to get our context.
    //ElemTemplateElement templElem =
    //  (ElemTemplateElement) xctxt.getNamespaceContext();
    
   // if (templElem.getXSLToken() != Constants.ELEMNAME_FOREACHGROUP)
   //  return new XNodeSet(null, null);
   // else 
    //{
    try{      
      return (XSequenceImpl)xctxt.getCurrentGroup().clone();
    }
    catch (CloneNotSupportedException e)
    {
      return XSequence.EMPTY;
    }
    //}
     
    
  }

  /**
   * Warn the user of a problem.
   *
   * @param xctxt The XPath runtime state.
   * @param msg Warning message code
   * @param args Arguments to be used in warning message
   * @throws XSLProcessorException thrown if the active ProblemListener and XPathContext decide
   * the error condition is severe enough to halt processing.
   *
   * @throws javax.xml.transform.TransformerException
   */
  public void warn(XPathContext xctxt, int msg, Object args[])
          throws javax.xml.transform.TransformerException
  {

    String formattedMsg = XSLMessages.createWarning(msg, args);
    ErrorListener errHandler = xctxt.getErrorListener();

    errHandler.warning(new TransformerException(formattedMsg,
                                             (SAXSourceLocator)xctxt.getSAXLocator()));
  }
  
  /**
   * This function is used to fixup variables from QNames to stack frame 
   * indexes at stylesheet build time.
   * @param vars List of QNames that correspond to variables.  This list 
   * should be searched backwards for the first qualified name that 
   * corresponds to the variable reference qname.  The position of the 
   * QName in the vector from the start of the vector will be its position 
   * in the stack frame (but variables above the globalsTop value will need 
   * to be offset to the current stack frame).
   */
  public void fixupVariables(VariableComposeState vcs)
  {
    
  }

  /**
   * Overide the superclass method to allow one or two arguments. 
   *
   *
   * @param argNum Number of arguments passed in
   *
   * @throws WrongNumberArgsException
   */
  public void checkNumberArgs(int argNum) throws WrongNumberArgsException
  {
    if (argNum > 0) 
      throw new WrongNumberArgsException(XSLMessages.createMessage(XSLTErrorResources.ER_TWO_OR_THREE, null)); //"2 or 3");
  }
}