001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements. See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership. The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the  "License");
007     * you may not use this file except in compliance with the License.
008     * You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    /*
019     * $Id: FuncNormalizeSpace.java 468655 2006-10-28 07:12:06Z minchau $
020     */
021    package org.apache.xpath.functions;
022    
023    import org.apache.xml.dtm.DTM;
024    import org.apache.xml.utils.XMLString;
025    import org.apache.xpath.XPathContext;
026    import org.apache.xpath.objects.XObject;
027    import org.apache.xpath.objects.XString;
028    import org.xml.sax.ContentHandler;
029    
030    /**
031     * Execute the normalize-space() function.
032     * @xsl.usage advanced
033     */
034    public class FuncNormalizeSpace extends FunctionDef1Arg
035    {
036        static final long serialVersionUID = -3377956872032190880L;
037    
038      /**
039       * Execute the function.  The function must return
040       * a valid object.
041       * @param xctxt The current execution context.
042       * @return A valid XObject.
043       *
044       * @throws javax.xml.transform.TransformerException
045       */
046      public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
047      {
048        XMLString s1 = getArg0AsString(xctxt);
049    
050        return (XString)s1.fixWhiteSpace(true, true, false);
051      }
052      
053      /**
054       * Execute an expression in the XPath runtime context, and return the 
055       * result of the expression.
056       *
057       *
058       * @param xctxt The XPath runtime context.
059       *
060       * @return The result of the expression in the form of a <code>XObject</code>.
061       *
062       * @throws javax.xml.transform.TransformerException if a runtime exception 
063       *         occurs.
064       */
065      public void executeCharsToContentHandler(XPathContext xctxt, 
066                                                  ContentHandler handler)
067        throws javax.xml.transform.TransformerException,
068               org.xml.sax.SAXException
069      {
070        if(Arg0IsNodesetExpr())
071        {
072          int node = getArg0AsNode(xctxt);
073          if(DTM.NULL != node)
074          {
075            DTM dtm = xctxt.getDTM(node);
076            dtm.dispatchCharactersEvents(node, handler, true);
077          }
078        }
079        else
080        {
081          XObject obj = execute(xctxt);
082          obj.dispatchCharactersEvents(handler);
083        }
084      }
085    
086    }