/** @since servlet-api-3.0 */
@Override
public FilterRegistration.Dynamic addFilter(String filterName, Filter filter) {
if (isStarted()) throw new IllegalStateException();
if (filterName == null || "".equals(filterName.trim()))
throw new IllegalStateException("Missing filter name");
if (!_enabled) throw new UnsupportedOperationException();
final ServletHandler handler = ServletContextHandler.this.getServletHandler();
FilterHolder holder = handler.getFilter(filterName);
if (holder == null) {
// new filter
holder = handler.newFilterHolder(Source.JAVAX_API);
holder.setName(filterName);
holder.setFilter(filter);
handler.addFilter(holder);
return holder.getRegistration();
}
if (holder.getClassName() == null && holder.getHeldClass() == null) {
// preliminary filter registration completion
holder.setFilter(filter);
return holder.getRegistration();
} else return null; // existing filter
}
@Override
public FilterRegistration getFilterRegistration(String filterName) {
if (!_enabled) throw new UnsupportedOperationException();
final FilterHolder holder =
ServletContextHandler.this.getServletHandler().getFilter(filterName);
return (holder == null) ? null : holder.getRegistration();
}
@Override
public Map<String, ? extends FilterRegistration> getFilterRegistrations() {
if (!_enabled) throw new UnsupportedOperationException();
HashMap<String, FilterRegistration> registrations = new HashMap<String, FilterRegistration>();
ServletHandler handler = ServletContextHandler.this.getServletHandler();
FilterHolder[] holders = handler.getFilters();
if (holders != null) {
for (FilterHolder holder : holders)
registrations.put(holder.getName(), holder.getRegistration());
}
return registrations;
}