public final void emit(String key, String value) throws IOException {
		String fileName;

		fileName = key + ".txt";

		File keyFile = new File(writeDir.getPath() + "/" + fileName);
		FileWriter fileStream = null;

		if(keyFile.exists()) {
			try {
				fileStream = new FileWriter(keyFile.getPath(), true);
				fileStream.append("\n");
				fileStream.append(value);
				fileStream.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		} else {
			keyFile = new File(writeDir, fileName);
			keyFile.createNewFile();

			fileStream = new FileWriter(keyFile.getPath(), true);
			fileStream.append(value);
			fileStream.close();
		}
	}