1 /*
   2  * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 
  25 package org.graalvm.compiler.serviceprovider;
  26 
  27 import jdk.vm.ci.services.Services;
  28 
  29 /**
  30  * Interface to query which JDK version Graal is running on.
  31  */
  32 public final class JavaVersionUtil {
  33 
  34     private static int getJavaSpecificationVersion() {
  35         String value = Services.getSavedProperties().get("java.specification.version");
  36         if (value.startsWith("1.")) {
  37             value = value.substring(2);
  38         }
  39         return Integer.parseInt(value);
  40     }
  41 
  42     /**
  43      * The integer value corresponding to the value of the {@code java.specification.version} system
  44      * property after any leading {@code "1."} has been stripped.
  45      */
  46     public static final int JAVA_SPECIFICATION_VERSION = getJavaSpecificationVersion();
  47 
  48     /**
  49      * Determines if the Java runtime is version 8 or earlier.
  50      */
  51     public static final boolean Java8OrEarlier = JAVA_SPECIFICATION_VERSION <= 8;
  52 
  53     /**
  54      * Determines if the Java runtime is version 11 or earlier.
  55      */
  56     public static final boolean Java11OrEarlier = JAVA_SPECIFICATION_VERSION <= 11;
  57 
  58     private JavaVersionUtil() {
  59     }
  60 }