KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > org > aspectj > debugger > base > Checker


1 /* -*- Mode: JDE; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2  *
3  * This file is part of the debugger and core tools for the AspectJ(tm)
4  * programming language; see http://aspectj.org
5  *
6  * The contents of this file are subject to the Mozilla Public License
7  * Version 1.1 (the "License"); you may not use this file except in
8  * compliance with the License. You may obtain a copy of the License at
9  * either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/.
10  *
11  * Software distributed under the License is distributed on an "AS IS" basis,
12  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13  * for the specific language governing rights and limitations under the
14  * License.
15  *
16  * The Original Code is AspectJ.
17  *
18  * The Initial Developer of the Original Code is Xerox Corporation. Portions
19  * created by Xerox Corporation are Copyright (C) 1999-2002 Xerox Corporation.
20  * All Rights Reserved.
21  */
22
23 package org.aspectj.debugger.base;
24
25 import java.util.*;
26
27 /**
28  * Checker.java
29  *
30  *
31  * Created: Wed Sep 27 16:47:49 2000
32  *
33  * @author <a HREF="mailto:palm@parc.xerox.com"Jeffrey Palm</a>
34  */
35
36 public class Checker {
37
38     private Debugger debugger;
39
40     public Checker(Debugger debugger) {
41         this.debugger = debugger;
42     }
43
44     public boolean check() {
45         return
46             checkJavaVersion() &
47             checkRuntimeEnvironment() ;
48     }
49
50     protected boolean checkJavaVersion() {
51         return
52                checkClass("com.sun.jdi.VirtualMachine",
53                          "tools.jar required to run ajdb")
54             && checkClass("com.sun.jdi.event.LocatableEvent",
55                           "tools.jar required to run ajdb")
56             && checkClass("com.sun.jdi.VMDisconnectedException",
57                           "JDK 1.3 or later tools.jar required to run ajdb")
58             ;
59     }
60
61     protected boolean checkClass(String JavaDoc className, String JavaDoc msg) {
62         try {
63             Class JavaDoc c = Class.forName(className);
64         } catch (ClassNotFoundException JavaDoc cnfe) {
65             debugger.fatal(msg);
66             return false;
67         }
68         return true;
69     }
70
71     protected boolean checkRuntimeEnvironment() {
72         return true;
73     }
74 }
75
Popular Tags