org.glassfish.jersey.internal.util.JdkVersion Maven / Gradle / Ivy
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package org.glassfish.jersey.internal.util;
/**
* JDK Version related utilities. Ported from Grizzly project.
*
* @author Ryan Lubke (ryan.lubke at oracle.com)
* @author Alexey Stashok (oleksiy.stashok at oracle.com)
* @since 2.3
*/
public class JdkVersion implements Comparable {
private static final boolean IS_UNSAFE_SUPPORTED;
static {
boolean unsafeSupported;
try {
// Look for sun.misc.Unsafe.
unsafeSupported = Class.forName("sun.misc.Unsafe") != null;
// Check environment availability.
// Google App Engine (see https://developers.google.com/appengine/docs/java/#Java_The_environment).
unsafeSupported &= System.getProperty("com.google.appengine.runtime.environment") == null;
} catch (final Throwable t) {
// Make Unsafe not supported if either:
// - sun.misc.Unsafe not found.
// - we're not granted to read the property (* is not enough).
unsafeSupported = false;
}
IS_UNSAFE_SUPPORTED = unsafeSupported;
}
private static final JdkVersion UNKNOWN_VERSION = new JdkVersion(-1, -1, -1, -1);
private static final JdkVersion JDK_VERSION = parseVersion(System.getProperty("java.version"));
private final int major;
private final int minor;
private final int maintenance;
private final int update;
// ------------------------------------------------------------ Constructors
private JdkVersion(final int major, final int minor, final int maintenance, final int update) {
this.major = major;
this.minor = minor;
this.maintenance = maintenance;
this.update = update;
}
// ---------------------------------------------------------- Public Methods
public static JdkVersion parseVersion(String versionString) {
try {
final int dashIdx = versionString.indexOf('-');
if (dashIdx != -1) {
versionString = versionString.substring(0, dashIdx);
}
final String[] parts = versionString.split("\\.|_");
if (parts.length == 3) {
return new JdkVersion(Integer.parseInt(parts[0]),
Integer.parseInt(parts[1]),
Integer.parseInt(parts[2]),
0);
} else {
return new JdkVersion(Integer.parseInt(parts[0]),
Integer.parseInt(parts[1]),
Integer.parseInt(parts[2]),
Integer.parseInt(parts[3]));
}
} catch (final Exception e) {
return UNKNOWN_VERSION;
}
}
public static JdkVersion getJdkVersion() {
return JDK_VERSION;
}
@SuppressWarnings("UnusedDeclaration")
public int getMajor() {
return major;
}
@SuppressWarnings("UnusedDeclaration")
public int getMinor() {
return minor;
}
@SuppressWarnings("UnusedDeclaration")
public int getMaintenance() {
return maintenance;
}
@SuppressWarnings("UnusedDeclaration")
public int getUpdate() {
return update;
}
/**
* Returns true if {@code sun.misc.Unsafe} is present in the
* current JDK version, or false otherwise.
*
* @since 2.3.6
*/
public boolean isUnsafeSupported() {
return IS_UNSAFE_SUPPORTED;
}
@Override
public String toString() {
return "JdkVersion" + "{major=" + major + ", minor=" + minor + ", maintenance=" + maintenance
+ ", update=" + update + '}';
}
// ------------------------------------------------- Methods from Comparable
public int compareTo(final String versionString) {
return compareTo(JdkVersion.parseVersion(versionString));
}
@Override
public int compareTo(final JdkVersion otherVersion) {
if (major < otherVersion.major) {
return -1;
}
if (major > otherVersion.major) {
return 1;
}
if (minor < otherVersion.minor) {
return -1;
}
if (minor > otherVersion.minor) {
return 1;
}
if (maintenance < otherVersion.maintenance) {
return -1;
}
if (maintenance > otherVersion.maintenance) {
return 1;
}
if (update < otherVersion.update) {
return -1;
}
if (update > otherVersion.update) {
return 1;
}
return 0;
}
}