Headline

A reuseable abstraction for traversal

Illustration

Consider the following Language:Java code from Contribution:xpathAPI which invokes an Language:XPath processor to retrieve all salary nodes so that they can be totaled:

public class Total {

    public static double total(Document doc) 
        throws Exception {

        // The aggregation variable 
        double total = 0;

        // Get the matching elements
        NodeList nodelist = XPathAPI.selectNodeList(doc, "//salary");

        // Process the elements in the nodelist
        for (int i=0; i<nodelist.getLength(); i++) {
            // Get element
            Element elem = (Element)nodelist.item(i);
            total += Double.parseDouble(elem.getTextContent());
        }
        return total;
    }
}

Specifically, the XPath API is invoked like this:

        NodeList nodelist = XPathAPI.selectNodeList(doc, "//salary");

The descendants axis of XPath (see "//") is leveraged here. This axis can be viewed as the provision of a traversal scheme.

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