edu.umass.cs.gnsclient.console.CommandLineInterface.java Source code

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Here is the source code for edu.umass.cs.gnsclient.console.CommandLineInterface.java

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/*
 *
 *  Copyright (c) 2015 University of Massachusetts
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you
 *  may not use this file except in compliance with the License. You
 *  may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 *  implied. See the License for the specific language governing
 *  permissions and limitations under the License.
 *
 *  Initial developer(s): Westy, Emmanuel Cecchet
 *
 */
package edu.umass.cs.gnsclient.console;

import edu.umass.cs.gnsclient.client.GNSClientConfig;
import edu.umass.cs.gnsclient.client.util.KeyPairUtils;
import java.io.IOException;
import java.io.PrintWriter;

import jline.ConsoleReader;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

/**
 * This class defines a CommandLineInterface
 *
 * @author <a href="mailto:cecchet@cs.umass.edu">Emmanuel Cecchet</a>
 * @version 1.0
 */
public class CommandLineInterface {

    /**
     * Starts the GNS command line interface (CLI) console
     *
     * @param args optional argument is -silent for no console output
     * @throws Exception
     */
    public static void main(String[] args) throws Exception {
        try {
            CommandLine parser = initializeOptions(args);
            if (parser.hasOption("help")) {
                printUsage();
                //System.out.println("-host and -port are required!");
                System.exit(1);
            }
            boolean silent = parser.hasOption("silent");
            boolean noDefaults = parser.hasOption("noDefaults");
            ConsoleReader consoleReader = new ConsoleReader(System.in, new PrintWriter(System.out, true));
            ConsoleModule module = new ConsoleModule(consoleReader);
            if (noDefaults) {
                module.setUseGnsDefaults(false);
                KeyPairUtils.removeDefaultGns();
            }
            module.setSilent(silent);
            if (!silent) {
                module.printString("GNS Client Version: " + GNSClientConfig.readBuildVersion() + "\n");
            }
            module.handlePrompt();
            System.exit(0);
        } catch (IOException e) {
            e.printStackTrace();
            System.exit(-1);
        }
    }

    // command line arguments
    // COMMAND LINE STUFF
    private static final HelpFormatter FORMATTER = new HelpFormatter();
    private static Options commandLineOptions;

    private static CommandLine initializeOptions(String[] args) throws ParseException {
        Option help = new Option("help", "Prints Usage");
        Option silent = new Option("silent", "Disables output");
        Option noDefaults = new Option("noDefaults", "Don't use server and guid defaults");

        commandLineOptions = new Options();
        commandLineOptions.addOption(help);
        commandLineOptions.addOption(silent);
        commandLineOptions.addOption(noDefaults);

        CommandLineParser parser = new GnuParser();
        return parser.parse(commandLineOptions, args, false);
    }

    private static void printUsage() {
        FORMATTER.printHelp("java -jar <JAR> <options>", commandLineOptions);
    }

}