1/*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the  "License");
7 * you may not use this file except in compliance with the License.
8 * You may obtain a copy of the License at
9 *
10 *     http://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing, software
13 * distributed under the License is distributed on an "AS IS" BASIS,
14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 * See the License for the specific language governing permissions and
16 * limitations under the License.
17 */
18/*
19 * $Id: FuncNormalizeSpace.java 468655 2006-10-28 07:12:06Z minchau $
20 */
21package org.apache.xpath.functions;
22
23import org.apache.xml.dtm.DTM;
24import org.apache.xml.utils.XMLString;
25import org.apache.xpath.XPathContext;
26import org.apache.xpath.objects.XObject;
27import org.apache.xpath.objects.XString;
28import org.xml.sax.ContentHandler;
29
30/**
31 * Execute the normalize-space() function.
32 * @xsl.usage advanced
33 */
34public class FuncNormalizeSpace extends FunctionDef1Arg
35{
36    static final long serialVersionUID = -3377956872032190880L;
37
38  /**
39   * Execute the function.  The function must return
40   * a valid object.
41   * @param xctxt The current execution context.
42   * @return A valid XObject.
43   *
44   * @throws javax.xml.transform.TransformerException
45   */
46  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
47  {
48    XMLString s1 = getArg0AsString(xctxt);
49
50    return (XString)s1.fixWhiteSpace(true, true, false);
51  }
52
53  /**
54   * Execute an expression in the XPath runtime context, and return the
55   * result of the expression.
56   *
57   *
58   * @param xctxt The XPath runtime context.
59   *
60   * @return The result of the expression in the form of a <code>XObject</code>.
61   *
62   * @throws javax.xml.transform.TransformerException if a runtime exception
63   *         occurs.
64   */
65  public void executeCharsToContentHandler(XPathContext xctxt,
66                                              ContentHandler handler)
67    throws javax.xml.transform.TransformerException,
68           org.xml.sax.SAXException
69  {
70    if(Arg0IsNodesetExpr())
71    {
72      int node = getArg0AsNode(xctxt);
73      if(DTM.NULL != node)
74      {
75        DTM dtm = xctxt.getDTM(node);
76        dtm.dispatchCharactersEvents(node, handler, true);
77      }
78    }
79    else
80    {
81      XObject obj = execute(xctxt);
82      obj.dispatchCharactersEvents(handler);
83    }
84  }
85
86}
87