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: FuncSum.java,v 1.11 2004/08/17 19:25:37 jycli Exp $
18: */
19: package org.apache.xpath.functions;
20:
21: import org.apache.xml.dtm.DTM;
22: import org.apache.xml.dtm.DTMIterator;
23: import org.apache.xml.utils.XMLString;
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 Sum() function.
30: * @xsl.usage advanced
31: */
32: public class FuncSum extends FunctionOneArg {
33: static final long serialVersionUID = -2719049259574677519L;
34:
35: /**
36: * Execute the function. The function must return
37: * a valid object.
38: * @param xctxt The current execution context.
39: * @return A valid XObject.
40: *
41: * @throws javax.xml.transform.TransformerException
42: */
43: public XObject execute(XPathContext xctxt)
44: throws javax.xml.transform.TransformerException {
45:
46: DTMIterator nodes = m_arg0.asIterator(xctxt, xctxt
47: .getCurrentNode());
48: double sum = 0.0;
49: int pos;
50:
51: while (DTM.NULL != (pos = nodes.nextNode())) {
52: DTM dtm = nodes.getDTM(pos);
53: XMLString s = dtm.getStringValue(pos);
54:
55: if (null != s)
56: sum += s.toDouble();
57: }
58: nodes.detach();
59:
60: return new XNumber(sum);
61: }
62: }
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