Headline

XML processing with Java's JDOM API

Characteristics

See Contribution:dom for a general motivation for exercising in-memory XML processing. The present implementation simply exercises yet another DOM-like API.

Illustration

The data model is implemented as xml files (sampleCompany.xml) that conform to a schema (Company.xsd).

Feature:Parsing is implemented by loading a Technology:JDOM Document object:

    public static Document parseCompany(String file) throws IOException, JDOMException {
        return new SAXBuilder().build(new File(file));
    }

Feature:Total and Feature:Cut are implemented using methods of Technology:JDOM's Document class:

    public static double total(Document doc) {

        // Aggregate salaries
        double total = 0;

        // Iterate over all salary elements
        Iterator<?> iterator = doc.getDescendants(new ElementFilter("salary"));
        while (iterator.hasNext()) {
            Element elem = (Element)iterator.next();
            Double salary = Double.valueOf(elem.getText());
            total += salary;
        }

        return total;
    }
    public static void cut(Document doc) {

        // Iterate over all salary elements
        Iterator<?> iterator = doc.getDescendants(new ElementFilter("salary"));

        // Snapshot these elements before modification
        List<Element> elems = new LinkedList<Element>();
        while (iterator.hasNext())
            elems.add((Element)iterator.next());

        // Iterate over salary elements and cut salaries
        for (Element elem : elems) {
            Double salary = Double.valueOf(elem.getText());
            elem.setText(Double.toString(salary/2));
        }
    }

Test cases are implemented for all Namespace:Features.

Relationships

Architecture

The contribution follows a standardized structure:

  • inputs contains input files for tests
  • src/main/java contains the following packages:
  • src/test/java contains the following packages:

Usage

This contribution uses Technology:Gradle for building. Technology:Eclipse is supported.

See https://github.com/101companies/101simplejava/blob/master/README.md

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