Use Topic object when communicating with amazon SNS api through mule

I'm using Anypoint Studio to experiment with connectors. At this point, i'm trying to make a simple flow that lists topics available at the amazon SNS endpoint and searches if a certain topic is available. So far, i'm able to get a response from the API with the list of topics, which i then transform to json using Object to JSON transformer, but i want to iterate through the list to search for a certain topic(using java or whatever filter). The topic entity already exists in the amazon API in Anypoint Studio but i can't find out how to map it to the response returned by the API. Any hint would be appreciated.