Class to manage URL category data structure in iOS

I need a class to manage URL classification data structures on iOS (you don't need to do the actual classification, just create the data management, the data will come from files/function calls) You can read the full spec in the detailed requirements. ## Deliverables I need a class to manage URL classification data structures on iOS (you don't need to do the actual classification, just create the data management, the data will come from files/function calls) Stage 1: Defining the categories, there will be an enum in the class with all the possible categories (I will change it later to all my categories), here is a sample list (taken from my C program): typedef enum _CategoriesEnum { ceAbortion=1, ceAds, ceAdult, //Not porn, but still not child save ceViolence, ceNude, ceAstrology, ceBanking, ceAlcoholDrugs } CategoriesEnum Stage 2: Loading data from files, the data structure is directories under the main directory, each directory has a file called domains which contains the domains for that category, when I load the file I will specify the master directory and a list of conversion between the directory name and enum. Directory structure sample: Main dir: --ads ----domains (file) --adult ----domains (file) The lookup will be: ads -> ceAds adult -> ceAdult The data in the structure is a domain name, so for example: [login to view URL], [login to view URL], [login to view URL] The data should be stored in a data container that has a fast search capabilities like a tree or map There can be more then one category for a site. Stage 3: Looking up the data, I need a function that I will provide a URL to it, the function will extract the host from the url, for example: <[login to view URL]>, the function will only search [[login to view URL]][1] The way the function will search the data is by doing searches for all possible host name, for example: [[login to view URL]][1] will also be searched for [login to view URL] if the [[login to view URL]][1] was not found. If the category is found, I will get back the enum of the category or categories. Stage 4: Adding a URL, I will be able to add a URL using a call, for example: AddURL("[login to view URL]",ceBanking) I can also specify: AddURL("[login to view URL]",ceAds) and [login to view URL] will have more then one category. Stage 5: When creating the class, I will be able to decide at creation if I want the class to have locking for thread safe, or not. The thread safety only needs to be for adding/querying the data via the API, at the stage of loading the data, there's no need for safety. Stage 6: Provide a test app that will load the data from file (data will be provided by me), and give me a two text boxes, one to query categories, I will enter a url and it will write the category, the second text box will allow me to add a url and a category.