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;
48 import java.util.Properties;
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 mainClass, String classpath, Properties sysProps,
71 String 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 getCommand(String mainClass, String classpath,
85 Properties sysProps, String args) {
86 if (classpath == null) {
87 classpath = System.getProperty("java.class.path");
88 }
89 StringBuffer command = new StringBuffer("java -cp ");
90 command.append(classpath);
91 command.append(" ");
92 if (sysProps != null) {
93 Enumeration names = sysProps.propertyNames();
94 while (names.hasMoreElements()) {
95 String name = (String) names.nextElement();
96 String 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 }