/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * particular file as subject to the "Classpath" exception as provided

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 */

package com.sun.tools.extcheck;

import java.io.*;

/**

 * Main program of extcheck

 */

public final class Main {

    public static final String INSUFFICIENT = "Insufficient number of arguments";

    public static final String MISSING = "Missing <jar file> argument";

    public static final String DOES_NOT_EXIST = "Jarfile does not exist: ";

    public static final String EXTRA = "Extra command line argument: ";

    /**

     * Terminates with one of the following codes

     *  1 A newer (or same version) jar file is already installed

     *  0 No newer jar file was found

     *  -1 An internal error occurred

     */

    public static void main(String args[]) {

        try {

            realMain(args);

        } catch (Exception ex) {

            System.err.println(ex.getMessage());

            System.exit(-1);

        }

    }

    public static void realMain(String[] args) throws Exception {

        if (args.length < 1) {

            usage(INSUFFICIENT);

        }

        int argIndex = 0;

        boolean verboseFlag = false;

        if (args[argIndex].equals("-verbose")) {

            verboseFlag = true;

            argIndex++;

            if (argIndex >= args.length) {

                usage(MISSING);

            }

        }

        String jarName = args[argIndex];

        argIndex++;

        File jarFile = new File(jarName);

        if (!jarFile.exists()){

            usage(DOES_NOT_EXIST + jarName);

        }

        if (argIndex < args.length) {

            usage(EXTRA + args[argIndex]);

        }

        ExtCheck jt = ExtCheck.create(jarFile,verboseFlag);

        boolean result = jt.checkInstalledAgainstTarget();

        if (result) {

            System.exit(0);

        } else {

            System.exit(1);

        }

    }

    private static void usage(String msg) throws Exception {

        throw new Exception(msg + "\nUsage: extcheck [-verbose] <jar file>");

    }

}