JApiCmp.java

package japicmp;

import io.airlift.airline.ParseException;
import io.airlift.airline.SingleCommand;
import japicmp.cli.JApiCli;
import japicmp.exception.JApiCmpException;

import java.util.logging.Level;
import java.util.logging.Logger;

public class JApiCmp {
	private static final Logger LOGGER = Logger.getLogger(JApiCmp.class.getName());
	static final String USE_HELP_OR_H_FOR_MORE_INFORMATION = "See '--help' or '-h' for more information.";
	private static final String CAUGHT_EXCEPTION = "Caught exception: ";

	private JApiCmp() {
		throw new IllegalAccessError("Illegal access.");
	}

	public static void main(String[] args) {
		SingleCommand<JApiCli.Compare> singleCommand = SingleCommand.singleCommand(JApiCli.Compare.class);
		try {
			JApiCli.Compare cmd = singleCommand.parse(args);
			if (!cmd.helpOption.showHelpIfRequested()) {
				cmd.run();
			}
		} catch (ParseException e) {
			LOGGER.log(Level.FINE, CAUGHT_EXCEPTION + e.getLocalizedMessage(), e);
			System.err.println("E: " + e.getMessage());
			System.out.println(USE_HELP_OR_H_FOR_MORE_INFORMATION);
			System.exit(128);
		} catch (JApiCmpException e) {
			LOGGER.log(Level.FINE, CAUGHT_EXCEPTION + e.getLocalizedMessage(), e);
			if (e.getReason() != JApiCmpException.Reason.NormalTermination) {
				System.err.println("E: " + e.getMessage());
				System.out.println(USE_HELP_OR_H_FOR_MORE_INFORMATION);
				System.exit(1);
			}
		} catch (Exception e) {
			LOGGER.log(Level.FINE, CAUGHT_EXCEPTION + e.getLocalizedMessage(), e);
			System.err.println(String.format("Execution of %s failed: %s", JApiCmp.class.getSimpleName(), e.getMessage()));
			e.printStackTrace();
			System.exit(1);
		}
	}
}