Помогите разобраться

public static StringWriter getAllDataFromInputStream(InputStream is) throws IOException {
    	StringWriter sw = new StringWriter();
    	BufferedReader br = new BufferedReader(new InputStreamReader(is));
    	String line = "";
    	String someLine;
    	while((someLine=br.readLine()) != null) {
    		line+=someLine;
    	}
    	sw.write(line);
        return sw;
    }