JDK8/Java8源码在线阅读

/*
 * Copyright (c) 1998, 2008, Oracle and/or its affiliates. All rights reserved.
 * 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
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

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);

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