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/Users/lyon/j4p/src/utils/SystemUtils.java
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1 package utils;
2
3 import futils.Futil;
4
5 import java.io.File;
6 import java.util.Enumeration;
7 import java.util.Properties;
8
9 /**
10 * DocJava, Inc. http://www.docjava.com Programmer: dlyon Date: Mar 29,
11 * 2004 Time: 3:33:32 PM
12 */
13 public class SystemUtils {
14
15 public static boolean isWindows() {
16 String osName = getOsName();
17 return osName.startsWith("Windows");
18 }
19
20 public static String getOsName() {
21 Properties prop = System.getProperties();
22 return prop.getProperty("os.name");
23 }
24
25 /**
26 * This works on windows and one the mac.
27 * It has not been tested on all platforms!
28 *
29 * @return location of the rmic compiler.
30 */
31 public static File getRmicPath() {
32 // first try the windows location
33 String sh = getSdkHome();
34 System.out.println("sdkhome="+getSdkHome());
35 String fs = getDirectorySeparator();
36 sh = sh +
37 fs +
38 "bin" +
39 fs + "rmic.exe";
40 File f = new File(sh);
41 if (f.exists()) return f;
42 // ok, that did not work..hmm
43 // lets try the mac location.
44 f = new File(fs + "usr" + fs + "bin" + fs + "rmic");
45 if (f.exists()) return f;
46 // OK, now I am stuck, lets ask the user:
47 f = Futil.getReadFile("please locate rmic");
48 System.out.println(
49 "please add:" + f + "to the getRmicPath in SystemUtils");
50 return f;
51 }
52
53 public static String getSdkHome() {
54 String jh = getJavaHome();
55 File f = new File(jh);
56 return f.getParent();
57 }
58
59 public static String getJavaHome() {
60 Properties prop = System.getProperties();
61 return prop.getProperty("java.home");
62 }
63
64 /**
65 * @return the location of the program that is running. Typically
66 * something like:<br><code> /User/lyon/current/j4p</code>.
67 */
68 public static String getUserDir() {
69 return System.getProperty("user.dir");
70 }
71
72 /**
73 * @return the character(s) used to delimit directories in path names.
74 * For example:<br> /home/lyon/foo, the file separator is "/".
75 */
76 public static String getDirectorySeparator() {
77 return System.getProperty("file.separator");
78 }
79
80 /**
81 * @return return the character use to delimit the paths in a list of
82 * paths.
83 */
84 public static String getPathSeparator() {
85 return System.getProperty("path.separator");
86 }
87
88 public static void printProps() {
89 Properties prop = System.getProperties();
90 prop.list(System.out);
91 }
92
93 public static void main(String[] args) {
94 printProps();
95 System.out.println("------------------------");
96 System.out.println("os.name=" + getOsName());
97 System.out.println("isWindows=" + isWindows());
98 System.out.println("free ram=" + free());
99 System.out.println("userDir=" + getUserDir());
100 System.out.println("userHome="+getUserHome());
101 System.out.println("path sep = " + getPathSeparator());
102 System.out.println("file sep = " + getDirectorySeparator());
103 System.out.println("getSdkHome=" + getSdkHome());
104 System.out.println("getRmicPath=" + getRmicPath());
105 System.out.println("getClassPath=" + SystemUtils.getClassPath());
106
107 }
108
109 /**
110 * @return a string that describes the JVM's free RAM
111 */
112 public static String free() {
113 futils.Exec e = new futils.Exec();
114 return e.getPrintRamString();
115 }
116
117 public static void props() {
118 Properties props = System.getProperties();
119 for (Enumeration e =
120 props.propertyNames(); e.hasMoreElements();) {
121 String key = (String) e.nextElement();
122 Print.println(key + " = " + (String) (props.get(key)));
123 }
124 }
125
126 public static void printProp(String p) {
127 System.out.println(p + ":" + System.getProperty(p));
128 }
129
130 public static String getClassPath() {
131 return System.getProperty("java.class.path");
132 }
133
134 public static void home() {
135 printProp("java.home");
136 }
137
138 public static void userDir() {
139 printProp("user.dir");
140 }
141 /**
142 * Returns the users home directory. For example:
143 * <code>C:\Documents and Settings\dlyon</code>
144 *
145 */
146 public static String getUserHome() {
147 return System.getProperty("user.home");
148 }
149 }
150
151 /*
152 java.runtime.name=Java(TM) 2 Runtime Environment, Stand...
153 sun.boot.library.path=C:\j2sdk1.4.1_02\jre\bin
154 java.vm.version=1.4.1_02-b06
155 java.vm.vendor=Sun Microsystems Inc.
156 java.vendor.url=http://java.sun.com/
157 path.separator=;
158 java.vm.name=Java HotSpot(TM) Client VM
159 file.encoding.pkg=sun.io
160 idea.launcher.port=7556
161 user.country=US
162 sun.os.patch.level=Service Pack 1
163 java.vm.specification.name=Java Virtual Machine Specification
164 user.dir=C:\lyon\j4p
165 java.runtime.version=1.4.1_02-b06
166 java.awt.graphicsenv=sun.awt.Win32GraphicsEnvironment
167 java.endorsed.dirs=C:\j2sdk1.4.1_02\jre\lib\endorsed
168 os.arch=x86
169 java.io.tmpdir=C:\DOCUME~1\dlyon\LOCALS~1\Temp\
170 line.separator=
171
172 java.vm.specification.vendor=Sun Microsystems Inc.
173 user.variant=
174 os.name=Windows XP
175 sun.java2d.fontpath=
176 java.library.path=C:\j2sdk1.4.1_02\bin;.;C:\WINDOWS\Sys...
177 java.specification.name=Java Platform API Specification
178 java.class.version=48.0
179 java.util.prefs.PreferencesFactory=java.util.prefs.WindowsPreferencesFac...
180 os.version=5.1
181 user.home=C:\Documents and Settings\dlyon
182 user.timezone=
183 java.awt.printerjob=sun.awt.windows.WPrinterJob
184 file.encoding=windows-1252
185 java.specification.version=1.4
186 user.name=dlyon
187 java.class.path=C:\j2sdk1.4.1_02\jre\lib\charsets.jar...
188 java.vm.specification.version=1.0
189 sun.arch.data.model=32
190 java.home=C:\j2sdk1.4.1_02\jre
191 java.specification.vendor=Sun Microsystems Inc.
192 user.language=en
193 awt.toolkit=sun.awt.windows.WToolkit
194 java.vm.info=mixed mode
195 java.version=1.4.1_02
196 java.ext.dirs=C:\j2sdk1.4.1_02\jre\lib\ext
197 sun.boot.class.path=C:\j2sdk1.4.1_02\jre\lib\rt.jar;C:\j2...
198 java.vendor=Sun Microsystems Inc.
199 file.separator=\
200 java.vendor.url.bug=http://java.sun.com/cgi-bin/bugreport...
201 idea.launcher.library=C:\IntelliJ-IDEA-4.0\bin\breakgen.dll
202 sun.cpu.endian=little
203 sun.io.unicode.encoding=UnicodeLittle
204 sun.cpu.isalist=pentium i486 i386
205 */
206