List planets = new ArrayList();
InputStream input = getClass().getResourceAsStream("./planets.xml");
URL rules = getClass().getResource("./planet-digester-rules.xml");
Digester digester = DigesterLoader.createDigester(rules);
digester.push(planets);
digester.parse( input );
System.out.println("Number of planets: " + planets.size());
System.out.println( "Planet Name where radius > 5000");
JXPathContext context = JXPathContext.newContext( planets );
Iterator iterator = context.iterate(".[@radius > 5000]/name");
while( iterator.hasNext() ) {
Object o = (Object) iterator.next();
System.out.println( "Object: " + o);
}
System.out.println( "Planet Name where a moon is named Deimos");
iterator = context.iterate("./moons[. = 'Deimos']/../name");
while( iterator.hasNext() ) {
String name = (String) iterator.next();
System.out.println( "Planet Namet: " + name);
}
System.out.println( "Planet where Helium percentage greater than 2");
iterator = context.iterate("./atmosphere/components/He[.>2]/../../..");
while( iterator.hasNext() ) {
Planet p = (Planet) iterator.next();
System.out.println( "Planet: " + p.getName());
}
System.out.println( "All of the Moon Names");
iterator = context.iterate("./moons");
while( iterator.hasNext() ) {
String moon = (String) iterator.next();
context.getVariables().declareVariable("moonName", moon);
String planet = (String) context.getValue("./moons[. = $moonName]/../name");
System.out.println( "Moon: " + moon + ", \t\t\tPlanet: " + planet);
}
