in src/main/java/org/apache/commons/beanutils2/PropertyUtilsBean.java [645:695]
public PropertyDescriptor getPropertyDescriptor(Object bean, String name) throws IllegalAccessException, InvocationTargetException, NoSuchMethodException {
Objects.requireNonNull(bean, "bean");
Objects.requireNonNull(name, "name");
// Resolve nested references
while (resolver.hasNested(name)) {
final String next = resolver.next(name);
final Object nestedBean = getProperty(bean, next);
if (nestedBean == null) {
throw new NestedNullException("Null property value for '" + next + "' on bean class '" + bean.getClass() + "'");
}
bean = nestedBean;
name = resolver.remove(name);
}
// Remove any subscript from the final name value
name = resolver.getProperty(name);
// Look up and return this property from our cache
// creating and adding it to the cache if not found.
if (name == null) {
return null;
}
final BeanIntrospectionData data = getIntrospectionData(bean.getClass());
PropertyDescriptor result = data.getDescriptor(name);
if (result != null) {
return result;
}
Map mappedDescriptors = getMappedPropertyDescriptors(bean);
if (mappedDescriptors == null) {
mappedDescriptors = new ConcurrentHashMap<Class<?>, Map>();
mappedDescriptorsCache.put(bean.getClass(), mappedDescriptors);
}
result = (PropertyDescriptor) mappedDescriptors.get(name);
if (result == null) {
// not found, try to create it
try {
result = new MappedPropertyDescriptor(name, bean.getClass());
} catch (final IntrospectionException ie) {
/*
* Swallow IntrospectionException TODO: Why?
*/
}
if (result != null) {
mappedDescriptors.put(name, result);
}
}
return result;
}