/*

 * Copyright (c) 1999, 2015, 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * 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 sun.misc;

import java.io.PrintStream;

public class Version {

    private static final String launcher_name =

        "@@LAUNCHER_NAME@@";

    private static final String java_version =

        "@@VERSION_SHORT@@";

    private static final String java_runtime_name =

        "@@RUNTIME_NAME@@";

    private static final String java_runtime_version =

        "@@VERSION_STRING@@";

    static {

        init();

    }

    public static void init() {

        System.setProperty("java.version", java_version);

        System.setProperty("java.runtime.version", java_runtime_version);

        System.setProperty("java.runtime.name", java_runtime_name);

    }

    private static boolean versionsInitialized = false;

    private static int jvm_major_version = 0;

    private static int jvm_minor_version = 0;

    private static int jvm_security_version = 0;

    private static int jvm_patch_version = 0;

    private static int jvm_build_number = 0;

    private static int jdk_major_version = 0;

    private static int jdk_minor_version = 0;

    private static int jdk_security_version = 0;

    private static int jdk_patch_version = 0;

    private static int jdk_build_number = 0;

    /**

     * In case you were wondering this method is called by java -version.

     * Sad that it prints to stderr; would be nicer if default printed on

     * stdout.

     */

    public static void print() {

        print(System.err);

    }

    /**

     * This is the same as print except that it adds an extra line-feed

     * at the end, typically used by the -showversion in the launcher

     */

    public static void println() {

        print(System.err);

        System.err.println();

    }

    /**

     * Give a stream, it will print version info on it.

     */

    public static void print(PrintStream ps) {

        boolean isHeadless = false;

        /* Report that we're running headless if the property is true */

        String headless = System.getProperty("java.awt.headless");

        if ( (headless != null) && (headless.equalsIgnoreCase("true")) ) {

            isHeadless = true;

        }

        /* First line: platform version. */

        ps.println(launcher_name + " version \"" + java_version + "\"");

        /* Second line: runtime version (ie, libraries). */

        if (java_runtime_name.indexOf("Embedded") != -1 && isHeadless) {

            // embedded builds report headless state

            ps.print(", headless");

        }

        ps.println(')');

        /* Third line: JVM information. */

        String java_vm_name    = System.getProperty("java.vm.name");

        String java_vm_version = System.getProperty("java.vm.version");

        String java_vm_info    = System.getProperty("java.vm.info");

                   java_vm_info + ")");

    }

    /**

     * Returns the major version of the running JVM.

     * @return the major version of the running JVM

     * @since 1.6

     */

    public static synchronized int jvmMajorVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_major_version;

    }

    /**

     * Returns the minor version of the running JVM.

     * @return the minor version of the running JVM

     * @since 1.6

     */

    public static synchronized int jvmMinorVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_minor_version;

    }

    /**

     * Returns the security version of the running JVM.

     * @return the security version of the running JVM

     * @since 9

     */

    public static synchronized int jvmSecurityVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_security_version;

    }

    /**

     * Returns the patch release version of the running JVM.

     * @return the patch release version of the running JVM

     * @since 9

     */

    public static synchronized int jvmPatchVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_patch_version;

    }

    /**

     * Returns the build number of the running JVM.

     * @return the build number of the running JVM

     * @since 1.6

     */

    public static synchronized int jvmBuildNumber() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_build_number;

    }

    /**

     * Returns the major version of the running JDK.

     * @return the major version of the running JDK

     * @since 1.6

     */

    public static synchronized int jdkMajorVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jdk_major_version;

    }

    /**

     * Returns the minor version of the running JDK.

     * @return the minor version of the running JDK

     * @since 1.6

     */

    public static synchronized int jdkMinorVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jdk_minor_version;

    }

    /**

     * Returns the security version of the running JDK.

     * @return the security version of the running JDK

     * @since 9

     */

    public static synchronized int jdkSecurityVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jdk_security_version;

    }

    /**

     * Returns the patch release version of the running JDK.

     * @return the patch release version of the running JDK

     * @since 9

     */

    public static synchronized int jdkPatchVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jdk_patch_version;

    }

    /**

     * Returns the build number of the running JDK.

     * @return the build number of the running JDK

     * @since 1.6

     */

    public static synchronized int jdkBuildNumber() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jdk_build_number;

    }

    private static synchronized void initVersions() {

        if (versionsInitialized) {

            return;

        }

        if (!getJvmVersionInfo()) {

            throw new InternalError("Unable to obtain JVM version info");

        }

        getJdkVersionInfo();

        versionsInitialized = true;

    }

    // Gets the JVM version info if available and sets the jvm_*_version fields

    // and its capabilities.

    private static native boolean getJvmVersionInfo();

    private static native void getJdkVersionInfo();

}

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