FuncCount.java revision 9f8118474e9513f7a5b7d2a05e4a0fb15d1a6569 
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: FuncCount.java 468655 2006-10-28 07:12:06Z minchau $
20 */
21package org.apache.xpath.functions;
22
23import org.apache.xml.dtm.DTMIterator;
24import org.apache.xpath.XPathContext;
25import org.apache.xpath.objects.XNumber;
26import org.apache.xpath.objects.XObject;
27
28/**
29 * Execute the Count() function.
30 * @xsl.usage advanced
31 */
32public class FuncCount extends FunctionOneArg
33{
34    static final long serialVersionUID = -7116225100474153751L;
35
36  /**
37   * Execute the function.  The function must return
38   * a valid object.
39   * @param xctxt The current execution context.
40   * @return A valid XObject.
41   *
42   * @throws javax.xml.transform.TransformerException
43   */
44  public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
45  {
46
47//    DTMIterator nl = m_arg0.asIterator(xctxt, xctxt.getCurrentNode());
48
49//    // We should probably make a function on the iterator for this,
50//    // as a given implementation could optimize.
51//    int i = 0;
52//
53//    while (DTM.NULL != nl.nextNode())
54//    {
55//      i++;
56//    }
57//    nl.detach();
58	DTMIterator nl = m_arg0.asIterator(xctxt, xctxt.getCurrentNode());
59	int i = nl.getLength();
60	nl.detach();
61
62    return new XNumber((double) i);
63  }
64}
65