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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * this work for additional information regarding copyright ownership.
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package com.sun.org.apache.xpath.internal.functions;

import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xml.internal.dtm.DTMIterator;
import com.sun.org.apache.xml.internal.utils.XMLString;
import com.sun.org.apache.xpath.internal.XPathContext;
import com.sun.org.apache.xpath.internal.objects.XNumber;
import com.sun.org.apache.xpath.internal.objects.XObject;

Execute the Sum() function.
@xsl.usage
advanced/**
 * 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.
Params:
xctxt – The current execution context.
Throws:
TransformerException – 
Returns:
A valid XObject./**
   * 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);
  }
}