com.sun.enterprise.util.JDK Maven / Gradle / Ivy
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
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/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package com.sun.enterprise.util;
/**
* A simple class that fills a hole in the JDK. It parses out the version numbers
* of the JDK we are running.
* Example:
* 1.6.0_u14 == major = 1 minor = 6, subminor = 0, update = 14
*
* @author bnevins
*/
public final class JDK {
private JDK() {
// no instances allowed!
}
/**
* See if the current JDK is legal for running GlassFish
* @return true if the JDK is >= 1.6.0
*/
public static boolean ok() {
return major == 1 && minor >= 6;
}
public static int getMajor() {
return major;
}
public static int getMinor() {
return minor;
}
public static int getSubMinor() {
return subminor;
}
public static int getUpdate() {
return update;
}
/**
* No instances are allowed so it is pointless to override toString
* @return Parsed version numbers
*/
public static String toStringStatic() {
return "major: " + JDK.getMajor() +
"\nminor: " + JDK.getMinor() +
"\nsubminor: " + JDK.getSubMinor() +
"\nupdate: " + JDK.getUpdate() +
"\nOK ==>" + JDK.ok();
}
static {
initialize();
}
// DO NOT initialize these variables. You'll be sorry if you do!
private static int major;
private static int minor;
private static int subminor;
private static int update;
// silently fall back to ridiculous defaults if something is crazily wrong...
private static void initialize() {
major = 1;
minor = subminor = update = 0;
try {
String jv = System.getProperty("java.version");
if(!StringUtils.ok(jv))
return; // not likely!!
String[] ss = jv.split("\\.");
if(ss == null || ss.length < 3 || !ss[0].equals("1"))
return;
major = Integer.parseInt(ss[0]);
minor = Integer.parseInt(ss[1]);
ss = ss[2].split("_");
if(ss == null || ss.length < 1)
return;
subminor = Integer.parseInt(ss[0]);
if(ss.length > 1)
update = Integer.parseInt(ss[1]);
}
catch(Exception e) {
// ignore -- use defaults
}
}
}