Java example source code file (Main.java)

This example Java source code file (Main.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

context, filereader, filewriter, ioexception, main, parse, printwriter, reader, rootnode, string

The Main.java Java example source code

/*
 * Copyright (c) 1998, 2013, 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 build.tools.jdwpgen;

import java.io.*;

class Main {

    static String specSource;
    static boolean genDebug = true;

    static void usage() {
        System.err.println();
        System.err.println(
            "java Main <spec_input> ...");
        System.err.println();
        System.err.println("Options:");
        System.err.println("-doc <doc_output>");
        System.err.println("-jdi <java_output>");
        System.err.println("-include <include_file_output>");
    }

    public static void main(String args[]) throws IOException {
        Reader reader = null;
        PrintWriter doc = null;
        PrintWriter jdi = null;
        PrintWriter include = null;

        // Parse arguments
        for (int i = 0 ; i < args.length ; ++i) {
            String arg = args[i];
            if (arg.startsWith("-")) {
                String fn = args[++i];
                if (arg.equals("-doc")) {
                    doc = new PrintWriter(new FileWriter(fn));
                } else if (arg.equals("-jdi")) {
                    jdi = new PrintWriter(new FileWriter(fn));
                } else if (arg.equals("-include")) {
                    include = new PrintWriter(new FileWriter(fn));
                } else {
                    System.err.println("Invalid option: " + arg);
                    usage();
                    return;
                }
            } else {
                specSource = arg;
                reader = new FileReader(specSource);
            }
        }
        if (reader == null) {
            System.err.println("<spec_input> must be specified");
            usage();
            return;
        }

        Parse parse = new Parse(reader);
        RootNode root = parse.items();
        root.parentAndExtractComments();
        root.prune();
        root.constrain(new Context());
        if (doc != null) {
            root.document(doc);
            doc.close();
        }
        if (jdi != null) {
            root.genJava(jdi, 0);
            jdi.close();
        }
        if (include != null) {
            root.genCInclude(include);
            include.close();
        }
    }
}