/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: FuncSum.java 468655 2006-10-28 07:12:06Z minchau $
*/
package org.apache.xpath.functions;
import org.apache.xml.dtm.DTM;
import org.apache.xml.dtm.DTMIterator;
import org.apache.xml.utils.XMLString;
import org.apache.xpath.XPathContext;
import org.apache.xpath.objects.XNumber;
import org.apache.xpath.objects.XObject;
/**
* Execute the Sum() function.
* @xsl.usage advanced
*/
public class FuncSum extends FunctionOneArg
{
static final long serialVersionUID = -2719049259574677519L;
/**
* Execute the function. The function must return
* a valid object.
* @param xctxt The current execution context.
* @return A valid XObject.
*
* @throws javax.xml.transform.TransformerException
*/
public XObject execute(XPathContext xctxt) throws javax.xml.transform.TransformerException
{
DTMIterator nodes = m_arg0.asIterator(xctxt, xctxt.getCurrentNode());
double sum = 0.0;
int pos;
while (DTM.NULL != (pos = nodes.nextNode()))
{
DTM dtm = nodes.getDTM(pos);
XMLString s = dtm.getStringValue(pos);
if (null != s)
sum += s.toDouble();
}
nodes.detach();
return new XNumber(sum);
}
}