1 package info.glogalcode.parameterLister;
3 import info.glogalcode.parameterLister.modules.TerminalModuleFactory;
4 import java.util.Arrays;
5 import java.util.HashMap;
7 import java.util.ServiceLoader;
8 import java.util.logging.Level;
9 import java.util.logging.Logger;
13 * @author Ing. František Kučera (frantovo.cz)
17 public static final String ENV_BASE = "PARAMETER_LISTER";
18 public static final String ENV_OUTPUT_MODULE_NAME = ENV_BASE + "_OUTPUT";
19 public static final String DEFAULT_MODULE = TerminalModuleFactory.MODULE_NAME;
21 public static final int EXIT_SUCCESS = 0;
22 public static final int EXIT_UNEXPECTED_ERROR = 1;
23 // 2 is reserved: http://www.tldp.org/LDP/abs/html/exitcodes.html#EXITCODESREF
24 public static final int EXIT_MODULE_ERROR = 3;
26 private static final Logger log = Logger.getLogger(CLI.class.getName());
28 public static void main(String[] args) {
31 ServiceLoader<OutputModuleFactory> modulesLoader = ServiceLoader.load(OutputModuleFactory.class);
32 final Map<String, OutputModuleFactory> modules = new HashMap<>();
33 modulesLoader.forEach(f -> modules.put(f.getName(), f));
35 String moduleName = System.getenv(ENV_OUTPUT_MODULE_NAME);
36 OutputModuleFactory moduleFactory = modules.getOrDefault(moduleName, modules.get(DEFAULT_MODULE));
37 OutputModule module = moduleFactory.createModule();
40 module.process(System.out, Arrays.asList(args));
41 } catch (OutputModuleException e) {
42 log.log(Level.SEVERE, "Error while processing output with module " + module.getClass().getName(), e);
43 System.exit(EXIT_MODULE_ERROR);
45 } catch (Exception e) {
46 log.log(Level.SEVERE, "Unexpected exception, probably bug.", e);
47 System.exit(EXIT_UNEXPECTED_ERROR);
50 System.exit(EXIT_SUCCESS);