/*

  * 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());

             }

         }

     }

 }