[JXPath] Write my own sumBigDecimal()-function

[Geerling, Andreas]

I am trying to write a function sumBigDecimal() similar to the sum() function. 
First I tried to create a ExtensionFunction, but i have the problem to iterate the 
values.

Only with Java, i would do it like this:

public static BigDecimal sumBigDecimal(JXPathContext context,String xpath) {
        Object obj = null;
        BigDecimal sum = new BigDecimal("0");
        Iterator iter = context.iterate(xpath);
        while (iter.hasNext()) {
                obj = iter.next();
                if (obj instanceof BigDecimal) {
                        sum = sum.add((BigDecimal) obj);
                }
        } return sum;
}

But I would like to use it "within" JXPath as a Function. 
Examples:

BigDecimal myBetrag = (BigDecimal) context.getValue(
        "myf:sumBigDecimal(positionen[freieAttribute/warengruppe='AA']/vbetrag)");

String artikelbezeichnung = (String) context.getValue(
     "positionen[sumBigDecimal(vbetrag) > $minBetrag]/bezeichnung)");

Can someone help me?

Andreas Geerling


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