1 /*
   2  * Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.internal.cmd;
  27 
  28 import java.util.Arrays;
  29 import java.util.Deque;
  30 import java.util.LinkedList;
  31 
  32 /**
  33  * Launcher class for JFR tools
  34  *
  35  */
  36 public final class Execute {
  37 
  38     public static void main(String... args) {
  39         Deque<String> argList = new LinkedList<>(Arrays.asList(args));
  40         if (argList.isEmpty()) {
  41             System.out.println();
  42             Command.displayHelp();
  43             return;
  44         }
  45         String command = argList.remove();
  46         for (Command c : Command.getCommands()) {
  47             if (c.getName().equals(command)) {
  48                 try {
  49                     c.execute(argList);
  50                 } catch (IllegalArgumentException iae) {
  51                     return; // already handled by command
  52                 } catch (Throwable e) {
  53                     System.out.println();
  54                     System.out.println(e.getMessage());
  55                     System.out.println();
  56                 }
  57                 return;
  58             }
  59         }
  60         System.out.println();
  61         System.out.println("Unknown command " + command + ".");
  62         System.out.println();
  63         Command.displayHelp();
  64     }
  65 }