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Java > Open Source Codes > org > apache > xpath > functions > FuncCount


1 /*
2  * Copyright 1999-2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 /*
17  * $Id: FuncCount.java,v 1.10 2004/02/17 04:34:00 minchau Exp $
18  */
19 package org.apache.xpath.functions;
20
21 import org.apache.xml.dtm.DTMIterator;
22 import org.apache.xpath.XPathContext;
23 import org.apache.xpath.objects.XNumber;
24 import org.apache.xpath.objects.XObject;
25
26 /**
27  * Execute the Count() function.
28  * @xsl.usage advanced
29  */
30 public class FuncCount extends FunctionOneArg
31 {
32
33   /**
34    * Execute the function. The function must return
35    * a valid object.
36    * @param xctxt The current execution context.
37    * @return A valid XObject.
38    *
39    * @throws javax.xml.transform.TransformerException
40    */
41   public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException JavaDoc
42   {
43
44 // DTMIterator nl = m_arg0.asIterator(xctxt, xctxt.getCurrentNode());
45
46 // // We should probably make a function on the iterator for this,
47 // // as a given implementation could optimize.
48 // int i = 0;
49 //
50 // while (DTM.NULL != nl.nextNode())
51 // {
52 // i++;
53 // }
54 // nl.detach();
55 DTMIterator nl = m_arg0.asIterator(xctxt, xctxt.getCurrentNode());
56     int i = nl.getLength();
57     nl.detach();
58
59     return new XNumber((double) i);
60   }
61 }
62
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