/*

 * Copyright (c) 2002, 2003, 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 sun.tools.javap;

import java.util.*;

import java.io.*;

/**

 * Entry point for javap, class file disassembler.

 *

 * @author  Sucheta Dambalkar (Adopted code from old javap)

 */

public class Main{

    private Vector classList = new Vector();

    private PrintWriter out;

    JavapEnvironment env = new JavapEnvironment();

    private static boolean errorOccurred = false;

    private static final String progname = "javap";

    public Main(PrintWriter out){

        this.out = out;

    }

    public static void main(String argv[]) {

        entry(argv);

        if (errorOccurred) {

            System.exit(1);

        }

    }

    /**

     * Entry point for tool if you don't want System.exit() called.

     */

    public static void entry(String argv[]) {

        PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));

        try {

            Main jpmain = new Main(out);

            jpmain.perform(argv);

        } finally {

            out.close();

        }

    }

    /**

     * Process the arguments and perform the desired action

     */

    private void perform(String argv[]) {

        if (parseArguments(argv)) {

            displayResults();

        }

    }

    private void error(String msg) {

        errorOccurred = true;

        System.err.println(msg);

        System.err.flush();

    }

    /**

     * Print usage information

     */

    private void usage() {

        java.io.PrintStream out = System.out;

        out.println("Usage: " + progname + " <options> <classes>...");

        out.println();

        out.println("where options include:");

        out.println("   -c                        Disassemble the code");

        out.println("   -classpath <pathlist>     Specify where to find user class files");

        out.println("   -extdirs <dirs>           Override location of installed extensions");

        out.println("   -help                     Print this usage message");

        out.println("   -J<flag>                  Pass <flag> directly to the runtime system");

        out.println("   -l                        Print line number and local variable tables");

        out.println("   -public                   Show only public classes and members");

        out.println("   -protected                Show protected/public classes and members");

        out.println("   -package                  Show package/protected/public classes");

        out.println("                             and members (default)");

        out.println("   -private                  Show all classes and members");

        out.println("   -s                        Print internal type signatures");

        out.println("   -bootclasspath <pathlist> Override location of class files loaded");

        out.println("                             by the bootstrap class loader");

        out.println("   -verbose                  Print stack size, number of locals and args for methods");

        out.println("                             If verifying, print reasons for failure");

        out.println();

    }

    /**

     * Parse the command line arguments.

     * Set flags, construct the class list and create environment.

     */

    private boolean parseArguments(String argv[]) {

        for (int i = 0 ; i < argv.length ; i++) {

            String arg = argv[i];

            if (arg.startsWith("-")) {

                if (arg.equals("-l")) {

                    env.showLineAndLocal = true;

                } else if (arg.equals("-private") || arg.equals("-p")) {

                    env.showAccess = env.PRIVATE;

                } else if (arg.equals("-package")) {

                    env.showAccess = env.PACKAGE;

                } else if (arg.equals("-protected")) {

                    env.showAccess = env.PROTECTED;

                } else if (arg.equals("-public")) {

                    env.showAccess = env.PUBLIC;

                } else if (arg.equals("-c")) {

                    env.showDisassembled = true;

                } else if (arg.equals("-s")) {

                    env.showInternalSigs = true;

                } else if (arg.equals("-verbose"))  {

                    env.showVerbose = true;

                } else if (arg.equals("-v")) {

                    env.showVerbose = true;

                } else if (arg.equals("-h")) {

                    error("-h is no longer available - use the 'javah' program");

                    return false;

                } else if (arg.equals("-verify")) {

                    error("-verify is no longer available - use 'java -verify'");

                    return false;

                } else if (arg.equals("-verify-verbose")) {

                    error("-verify is no longer available - use 'java -verify'");

                    return false;

                } else if (arg.equals("-help")) {

                    usage();

                    return false;

                } else if (arg.equals("-classpath")) {

                    if ((i + 1) < argv.length) {

                        env.classPathString = argv[++i];

                    } else {

                        error("-classpath requires argument");

                        usage();

                        return false;

                    }

                } else if (arg.equals("-bootclasspath")) {

                    if ((i + 1) < argv.length) {

                        env.bootClassPathString = argv[++i];

                    } else {

                        error("-bootclasspath requires argument");

                        usage();

                        return false;

                    }

                } else if (arg.equals("-extdirs")) {

                    if ((i + 1) < argv.length) {

                        env.extDirsString = argv[++i];

                    } else {

                        error("-extdirs requires argument");

                        usage();

                        return false;

                    }

                } else if (arg.equals("-all")) {

                    env.showallAttr = true;

                } else {

                    error("invalid flag: " + arg);

                    usage();

                    return false;

                }

            } else {

                classList.addElement(arg);

                env.nothingToDo = false;

            }

        }

        if (env.nothingToDo) {

            System.out.println("No classes were specified on the command line.  Try -help.");

            errorOccurred = true;

            return false;

        }

        return true;

    }

    /**

     * Display results

     */

    private void displayResults() {

        for (int i = 0; i < classList.size() ; i++ ) {

            String Name = (String)classList.elementAt(i);

            InputStream classin = env.getFileInputStream(Name);

            try {

                JavapPrinter printer = new JavapPrinter(classin, out, env);

                printer.print();                // actual do display

            } catch (IllegalArgumentException exc) {

                error(exc.getMessage());

            }

        }

    }

}