Process n2k from n2kMapping.json

gistfile1.txt

//java, the main part of my processor.

/*
	 *  {
    "timestamp": "2013-10-08-15:47:28.264",
    "prio": "2",
    "src": "2",
    "dst": "255",
    "pgn": "129025",
    "description": "Position, Rapid Update",
    "fields": {
        "Latitude": "60.1445540",
        "Longitude": "24.7921348"
    }
}
*/
	 
	//@Override
	public Json  handle(String n2kmsg) {
		//get the pgn value
		String pgn = JsonPath.read(n2kmsg,"$.pgn");
		logger.debug("processing n2k pgn "+pgn );
		if(mappings.has(pgn)){
			//process it, mappings is n2kMapping.json as a json object
			Json mapping = mappings.at(pgn);
			if( mapping==null)return null;	
			
			//make a dummy signalk object
			SignalKModel temp =  SignalKModelFactory.getCleanInstance();
			//mapping contains an array
			for(Json map : mapping.asJsonList()){
				//TODO: precompile the mappings for performance, precompile the msg to json Document
				//TODO: changes to n2k formatted output mean we will get back string, int,long,float, double here
				String var = JsonPath.read(n2kmsg, map.at(FILTER).asString()+"."+map.at(SOURCE).asString());
				Object obj = resolve(var);
				String node = map.at(NODE).asString();
				if(node!=null && var!=null){
					//put in signalk tree
					temp.putWith(self+node, obj);
					
				}
			}
			logger.debug("N2KProcessor output  "+temp );
			return (Json) temp;
		}
		return null;
		
	}
	private Object resolve(String var) {
		if(var==null) return null;
		try {
			return numberFormat.parse(var);
		} catch (ParseException e) {
			return var;
		}
		
	}