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Java > Open Source Codes > org > exolab > jms > net > jvm > JVM


1 /**
2  * Redistribution and use of this software and associated documentation
3  * ("Software"), with or without modification, are permitted provided
4  * that the following conditions are met:
5  *
6  * 1. Redistributions of source code must retain copyright
7  * statements and notices. Redistributions must also contain a
8  * copy of this document.
9  *
10  * 2. Redistributions in binary form must reproduce the
11  * above copyright notice, this list of conditions and the
12  * following disclaimer in the documentation and/or other
13  * materials provided with the distribution.
14  *
15  * 3. The name "Exolab" must not be used to endorse or promote
16  * products derived from this Software without prior written
17  * permission of Exoffice Technologies. For written permission,
18  * please contact info@exolab.org.
19  *
20  * 4. Products derived from this Software may not be called "Exolab"
21  * nor may "Exolab" appear in their names without prior written
22  * permission of Exoffice Technologies. Exolab is a registered
23  * trademark of Exoffice Technologies.
24  *
25  * 5. Due credit should be given to the Exolab Project
26  * (http://www.exolab.org/).
27  *
28  * THIS SOFTWARE IS PROVIDED BY EXOFFICE TECHNOLOGIES AND CONTRIBUTORS
29  * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
30  * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
31  * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
32  * EXOFFICE TECHNOLOGIES OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
33  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
34  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
35  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
37  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
38  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
39  * OF THE POSSIBILITY OF SUCH DAMAGE.
40  *
41  * Copyright 2004 (C) Exoffice Technologies Inc. All Rights Reserved.
42  *
43  * $Id: JVM.java,v 1.1 2004/11/26 01:51:10 tanderson Exp $
44  */
45 package org.exolab.jms.net.jvm;
46
47 import java.util.Enumeration JavaDoc;
48 import java.util.Properties JavaDoc;
49
50
51 /**
52  * Helper for starting a new JVM.
53  *
54  * @version $Revision: 1.1 $ $Date: 2004/11/26 01:51:10 $
55  * @author <a HREF="mailto:tma@netspace.net.au">Tim Anderson</a>
56  */
57 public class JVM extends Executor {
58
59     /**
60      * Construct a new <code>JVM</code>, specifying the classpath
61      * Output will be directed to System.out and System.err
62      *
63      * @param mainClass the fully qualified name of the main class
64      * @param classpath the classpath. If <code>null</code>, uses the
65      * value of the <code>"java.class.path"</code> system property
66      * @param sysProps system properties to pass to the JVM.
67      * May be <code>null</code>
68      * @param args the command line arguments. May be <code>null</code>
69      */
70     public JVM(String JavaDoc mainClass, String JavaDoc classpath, Properties JavaDoc sysProps,
71                String JavaDoc args) {
72         super(getCommand(mainClass, classpath, sysProps, args));
73     }
74
75     /**
76      * Generates the command line for the JVM
77      *
78      * @param mainClass the fully qualified name of the main class
79      * @param classpath the classpath. If <code>null</code>, uses the
80      * value of the <code>"java.class.path"</code> system property
81      * @param sysProps system properties to pass to the JVM.
82      * @param args the command line arguments. May be <code>null</code>
83      */
84     private static String JavaDoc getCommand(String JavaDoc mainClass, String JavaDoc classpath,
85                                      Properties JavaDoc sysProps, String JavaDoc args) {
86         if (classpath == null) {
87             classpath = System.getProperty("java.class.path");
88         }
89         StringBuffer JavaDoc command = new StringBuffer JavaDoc("java -cp ");
90         command.append(classpath);
91         command.append(" ");
92         if (sysProps != null) {
93             Enumeration JavaDoc names = sysProps.propertyNames();
94             while (names.hasMoreElements()) {
95                 String JavaDoc name = (String JavaDoc) names.nextElement();
96                 String JavaDoc value = sysProps.getProperty(name);
97                 command.append("-D");
98                 command.append(name);
99                 command.append("=");
100                 command.append(value);
101                 command.append(" ");
102             }
103         }
104         command.append(mainClass);
105         if (args != null) {
106             command.append(" ");
107             command.append(args);
108         }
109         return command.toString();
110     }
111 }
112
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