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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2012-2015 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* http://glassfish.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
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* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
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;
}
}