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1 /*
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2 * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 class ArgIterator {
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26 String[] args;
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27 int i;
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28 ArgIterator(String[] args) {
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29 this.args = args;
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30 this.i = 0;
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31 }
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32 String get() { return args[i]; }
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33 boolean hasMore() { return args != null && i < args.length; }
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34 boolean next() { return ++i < args.length; }
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35 }
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36
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37 abstract class ArgHandler {
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38 public abstract void handle(ArgIterator it);
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39
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40 }
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41
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42 class ArgRule {
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43 String arg;
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44 ArgHandler handler;
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45 ArgRule(String arg, ArgHandler handler) {
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46 this.arg = arg;
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47 this.handler = handler;
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48 }
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49
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50 boolean process(ArgIterator it) {
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51 if (match(it.get(), arg)) {
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52 handler.handle(it);
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53 return true;
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54 }
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55 return false;
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56 }
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57 boolean match(String rule_pattern, String arg) {
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58 return arg.equals(rule_pattern);
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59 }
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60 }
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61
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62 class ArgsParser {
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63 ArgsParser(String[] args,
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64 ArgRule[] rules,
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65 ArgHandler defaulter) {
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66 ArgIterator ai = new ArgIterator(args);
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67 while (ai.hasMore()) {
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68 boolean processed = false;
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69 for (int i=0; i<rules.length; i++) {
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70 processed |= rules[i].process(ai);
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71 if (processed) {
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72 break;
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73 }
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74 }
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75 if (!processed) {
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76 if (defaulter != null) {
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77 defaulter.handle(ai);
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78 } else {
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79 System.err.println("ERROR: unparsed \""+ai.get()+"\"");
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80 ai.next();
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81 }
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82 }
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83 }
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84 }
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85 }
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