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.xpath.functions;
  
  import org.apache.xml.dtm.DTM;
  import org.apache.xml.utils.XMLString;
  import org.apache.xpath.XPathContext;
  import org.apache.xpath.objects.XObject;
  import org.apache.xpath.objects.XString;
  import org.xml.sax.ContentHandler;
  
  /**
   * Execute the normalize-space() function.
   * @xsl.usage advanced
   */
  public class FuncNormalizeSpace extends FunctionDef1Arg
  {
      static final long serialVersionUID = -3377956872032190880L;
  
    /**
     * 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
    {
      XMLString s1 = getArg0AsString(xctxt);
  
      return (XString)s1.fixWhiteSpace(true, true, false);
    }
    
    /**
     * Execute an expression in the XPath runtime context, and return the 
     * result of the expression.
     *
     *
     * @param xctxt The XPath runtime context.
     *
     * @return The result of the expression in the form of a <code>XObject</code>.
     *
     * @throws javax.xml.transform.TransformerException if a runtime exception 
     *         occurs.
     */
    public void executeCharsToContentHandler(XPathContext xctxt, 
                                                ContentHandler handler)
      throws javax.xml.transform.TransformerException,
             org.xml.sax.SAXException
    {
      if(Arg0IsNodesetExpr())
      {
        int node = getArg0AsNode(xctxt);
        if(DTM.NULL != node)
        {
          DTM dtm = xctxt.getDTM(node);
          dtm.dispatchCharactersEvents(node, handler, true);
        }
      }
      else
      {
        XObject obj = execute(xctxt);
        obj.dispatchCharactersEvents(handler);
      }
    }
  
  }
  