01: /*
02: * Copyright 1999-2004 The Apache Software Foundation.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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 1.11 2004/08/17 19:25:36 jycli 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: static final long serialVersionUID = -7116225100474153751L;
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)
42: throws javax.xml.transform.TransformerException {
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
56: .getCurrentNode());
57: int i = nl.getLength();
58: nl.detach();
59:
60: return new XNumber((double) i);
61: }
62: }
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