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  */
21 package org.apache.xpath.functions;
22 
23 import org.apache.xml.dtm.DTMIterator;
24 import org.apache.xpath.XPathContext;
25 import org.apache.xpath.objects.XNumber;
26 import org.apache.xpath.objects.XObject;
27 
28 /**
29  * Execute the Count() function.
30  * @xsl.usage advanced
31  */
32 public 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    */
execute(XPathContext xctxt)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