@Override
protected CompositeConnector updateHandlerAttributes(CompositeConnector handler, Map<String, String> attributes) {
String strategyFilter = createStrategyFilterString(attributes.get("compositeStrategy"));
Filter filter = FilterUtils.makeFilter(CompositeConnectorStrategy.class, strategyFilter);
CompositeConnectorStrategy strategy =
utilsService.getOsgiServiceProxy(filter, CompositeConnectorStrategy.class);
handler.setQueryString(attributes.get("queryString"));
handler.setCompositeHandler(strategy);
return handler;
}