Passing Parameters in Command Context

public class AvgStockVolPerMonthMapper extends Mapper<LongWritable, Text, TextPair, LongPair> {

	private static NYSEParser parser = new NYSEParser();
	private static TextPair mapOutputKey = new TextPair();
	private static LongPair mapOutputValue = new LongPair();

	private static Set<String> stockTickers = new HashSet<String>();

	protected void setup(Context context) throws IOException, InterruptedException {
		String stockTicker = context.getConfiguration().get("filter.by.stock");
		if (stockTicker != null) {
			String[] tickers = stockTicker.split(",");

			for (String ticker : tickers) {
				stockTickers.add(ticker);
			}
		}
	}

	public void map(LongWritable lineOffset, Text record, Context context) throws IOException, InterruptedException {
		parser.parse(record.toString());

		if (stockTickers.isEmpty() || (!stockTickers.isEmpty() && stockTickers.contains(parser.getStockTicker()))) {
			
			if(parser.getStockTicker().equals("AAN")|| parser.getStockTicker().equals("AEB")|| parser.getStockTicker().equals("TCB")|| parser.getStockTicker().equals("XAA"))
			{
				mapOutputKey.setFirst(new Text(parser.getTradeMonth()));
				mapOutputKey.setSecond(new Text(parser.getStockTicker()));
	
				mapOutputValue.setFirst(new LongWritable(parser.getVolume()));
				mapOutputValue.setSecond(new LongWritable(1));
				
				context.write(mapOutputKey, mapOutputValue);
			}			
		}
	}

}