/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */


package org.graalvm.compiler.serviceprovider;

import jdk.vm.ci.services.Services;

/**
 * Interface to query which JDK version Graal is running on.
 */
public final class JavaVersionUtil {

    private static int getJavaSpecificationVersion() {
        String value = Services.getSavedProperties().get("java.specification.version");
        if (value.startsWith("1.")) {
            value = value.substring(2);
        }
        return Integer.parseInt(value);
    }

    /**
     * The integer value corresponding to the value of the {@code java.specification.version} system
     * property after any leading {@code "1."} has been stripped.
     */
    public static final int JAVA_SPECIFICATION_VERSION = getJavaSpecificationVersion();

    /**
     * Determines if the Java runtime is version 8 or earlier.
     */
    public static final boolean Java8OrEarlier = JAVA_SPECIFICATION_VERSION <= 8;

    /**
     * Determines if the Java runtime is version 11 or earlier.
     */
    public static final boolean Java11OrEarlier = JAVA_SPECIFICATION_VERSION <= 11;

    private JavaVersionUtil() {
    }
}