1 /*
   2  * Copyright (c) 2009, 2010, 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 org.openjdk.jigsaw.cli;
  27 
  28 import java.io.*;
  29 import java.nio.file.*;
  30 import java.util.*;
  31 import org.openjdk.internal.joptsimple.OptionSet;
  32 
  33 
  34 /* package */ abstract class Command<C> {
  35 
  36     static class Exception
  37         extends java.lang.Exception
  38     {
  39 
  40         private static final long serialVersionUID = 74132770414881L;
  41 
  42         public Exception(String fmt, Object ... args) {
  43             super(String.format(fmt, args));
  44         }
  45 
  46         private static String summarize(String what, IOException x) {
  47             String msg = null;
  48             if (x instanceof FileSystemException) {
  49                 FileSystemException y = (FileSystemException)x;
  50                 // ## There should be a better way to do this!
  51                 msg = (y.getClass().getName()
  52                        .replace("Exception", "")
  53                        .replace("java.nio.file.", "")
  54                        .replaceAll("(\\p{Lower})(\\p{Upper})",
  55                                    "$1 $2"));
  56                 msg = msg.charAt(0) + msg.substring(1).toLowerCase();
  57                 if (what == null)
  58                     what = y.getFile();
  59             } else {
  60                 msg = x.getMessage();
  61             }
  62             if (what != null)
  63                 return String.format("%s: %s", what, msg);
  64             return String.format("I/O error: %s", x.getMessage());
  65         }
  66 
  67         public Exception(IOException x) {
  68             super(summarize(null, x));
  69             initCause(x);
  70         }
  71 
  72         public Exception(String what, IOException x) {
  73             super(summarize(what, x));
  74             initCause(x);
  75         }
  76 
  77         public Exception(java.lang.Exception x) {
  78             super(x);
  79         }
  80 
  81     }
  82 
  83     protected boolean verbose;
  84     protected boolean force;
  85     protected boolean dry;

  86     protected String command;
  87     protected LinkedList<String> args;
  88     protected OptionSet opts;
  89 
  90     final void run(C context, OptionSet opts) throws Command.Exception {
  91         verbose = opts.has("verbose");
  92         force = opts.has("force");
  93         dry = opts.has("dry-run");
  94         args = new LinkedList<String>(opts.nonOptionArguments());

  95         command = args.remove();
  96         this.opts = opts;
  97         go(context);
  98     }
  99 
 100     protected abstract void go(C context) throws Command.Exception;
 101 
 102     protected boolean hasArg() {
 103         return !args.isEmpty();
 104     }
 105 
 106     protected String takeArg()
 107         throws Command.Exception
 108     {
 109         if (args.isEmpty())
 110             throw new Command.Exception("%s: Insufficient arguments", command);
 111         return args.remove();
 112     }
 113 
 114     protected void finishArgs()
 115         throws Command.Exception
 116     {
 117         if (!args.isEmpty()) {
 118             StringBuilder sb = new StringBuilder();
 119             for (String a : args)
 120                 sb.append(" ").append(a);
 121             throw new Command.Exception("%s: Extraneous arguments:%s",
 122                                         command, sb.toString());
 123         }
 124     }
 125 
 126     protected void noDry()
 127         throws Command.Exception
 128     {
 129         if (dry)
 130             throw new Command.Exception("%s: Option -n (--dry-run)"
 131                                         + " not supported",
 132                                         command);
 133     }
 134 
 135 }
--- EOF ---