1 /*
   2  * Copyright (c) 2005, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 class ArgIterator {
  26     String[] args;
  27     int i;
  28     ArgIterator(String[] args) {
  29         this.args = args;
  30         this.i = 0;
  31     }
  32     String get() { return args[i]; }
  33     boolean hasMore() { return args != null && i  < args.length; }
  34     boolean next() { return ++i < args.length; }
  35 }
  36 
  37 abstract class ArgHandler {
  38     public abstract void handle(ArgIterator it);
  39 
  40 }
  41 
  42 class ArgRule {
  43     String arg;
  44     ArgHandler handler;
  45     ArgRule(String arg, ArgHandler handler) {
  46         this.arg = arg;
  47         this.handler = handler;
  48     }
  49 
  50     boolean process(ArgIterator it) {
  51         if (match(it.get(), arg)) {
  52             handler.handle(it);
  53             return true;
  54         }
  55         return false;
  56     }
  57     boolean match(String rule_pattern, String arg) {
  58         return arg.equals(rule_pattern);
  59     }
  60 }
  61 
  62 class ArgsParser {
  63     ArgsParser(String[] args,
  64                ArgRule[] rules,
  65                ArgHandler defaulter) {
  66         ArgIterator ai = new ArgIterator(args);
  67         while (ai.hasMore()) {
  68             boolean processed = false;
  69             for (int i=0; i<rules.length; i++) {
  70                 processed |= rules[i].process(ai);
  71                 if (processed) {
  72                     break;
  73                 }
  74             }
  75             if (!processed) {
  76                 if (defaulter != null) {
  77                     defaulter.handle(ai);
  78                 } else {
  79                     System.err.println("ERROR: unparsed \""+ai.get()+"\"");
  80                     ai.next();
  81                 }
  82             }
  83         }
  84     }
  85 }