QueryByCriteriaJaxbTest.java 文件源码

/**
 * Search the classes in the PREDICATE_BASE_PACKAGE and build a list of all simple (non-composite) Predicate classes
 * @return a list of simple Predicate classes
 * @throws ClassNotFoundException
 */
private ArrayList<Class<?>> discoverSimplePredicateClasses() throws ClassNotFoundException {
    ArrayList<Class<?>> discoveredPredicateClasses = new ArrayList<Class<?>>();

    // This technique was copped from:
    // http://stackoverflow.com/questions/520328/can-you-find-all-classes-in-a-package-using-reflection

    ClassPathScanningCandidateComponentProvider provider = new ClassPathScanningCandidateComponentProvider(true);
    provider.addIncludeFilter(new AssignableTypeFilter(Predicate.class));

    // scan in org.example.package
    Set<BeanDefinition> components = provider.findCandidateComponents(PREDICATE_BASE_PACKAGE);
    for (BeanDefinition component : components)
    {
        Class cls = Class.forName(component.getBeanClassName());
        if (!cls.isMemberClass()                             // filter out inner class predicates from test packages
            && Predicate.class.isAssignableFrom(cls)         // filter out any non-predicate classes
            && !CompositePredicate.class.isAssignableFrom(cls)) // filter out 'and' and 'or' predicates
        {
            discoveredPredicateClasses.add(cls);
            // use class cls found
            LOG.debug("discovered " + cls.toString());
        }
    }
    return discoveredPredicateClasses;
}