import pymongo

class MongoManager:
    __instance = None

    @staticmethod
    def getInstance():
        if MongoManager.__instance == None:
            MongoManager()
        return MongoManager.__instance

    def __init__(self):
        if MongoManager.__instance != None:
            raise Exception("This class is a singleton!")
        else:
            MongoManager.__instance = pymongo.MongoClient('127.0.0.1', 27017)
            db = MongoManager.__instance.AIC
            coll = db.metadata
            coll.create_index("filename",unique=True)
            coll.create_index([("loc", pymongo.GEO2D)])