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Utility and library for applying binary patches to file system directories

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package com.alexkasko.delta;

import org.apache.commons.cli.*;

import java.io.File;

import static java.lang.System.out;

/**
 * Delta patch launcher class
 *
 * @author alexkasko
 * Date: 11/19/11
 */
public class PatchLauncher {

    private static final String HELP_OPTION = "help";

    /**
     * app entry point
     */
    public static void main(String[] args) throws Exception {
        Options options = new Options();
        try {
            options.addOption("h", HELP_OPTION, false, "show this page");
            CommandLine cline = new GnuParser().parse(options, args);
            String[] argList = cline.getArgs();
            if (cline.hasOption(HELP_OPTION)) {
                throw new ParseException("Printing help page:");
            } else if(2 == argList.length) {
                new DirDeltaPatcher().patch(new File(argList[0]), new File(argList[1]));
            } else {
                throw new ParseException("Incorrect arguments received!");
            }
        } catch (ParseException e) {
            HelpFormatter formatter = new HelpFormatter();
            out.println(e.getMessage());
            formatter.printHelp("java -jar delta-patch.jar dir patch.zip", options);
        }
    }
}