/*

 * 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 =

    private static final String java_version =

    private static final String java_runtime_name =

    private static final String java_runtime_version =

    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_update_version = 0;

    private static int jvm_build_number = 0;

    private static String jvm_special_version = null;

    private static int jdk_major_version = 0;

    private static int jdk_minor_version = 0;

    private static int jdk_update_version = 0;

    private static int jdk_build_number = 0;

    private static String jdk_special_version = null;

    /**

     * 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). */

        ps.print(java_runtime_name + " (build " + java_runtime_version);

        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");

        ps.println(java_vm_name + " (build " + java_vm_version + ", " +

                   java_vm_info + ")");

    }

    /**

     * Returns the major version of the running JVM if it's 1.6 or newer

     * or any RE VM build. It will return 0 if it's an internal 1.5 or

     * 1.4.x build.

     *

     * @since 1.6

     */

    public static synchronized int jvmMajorVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_major_version;

    }

    /**

     * Returns the minor version of the running JVM if it's 1.6 or newer

     * or any RE VM build. It will return 0 if it's an internal 1.5 or

     * 1.4.x build.

     * @since 1.6

     */

    public static synchronized int jvmMinorVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_minor_version;

    }

    /**

     * or any RE VM build. It will return 0 if it's an internal 1.5 or

     * 1.4.x build.

     * @since 1.6

     */

        if (!versionsInitialized) {

            initVersions();

        }

    }

    /**

     * Returns the update release version of the running JVM if it's

     * a RE build. It will return 0 if it's an internal build.

     * @since 1.6

     */

    public static synchronized int jvmUpdateVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_update_version;

    }

    public static synchronized String jvmSpecialVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        if (jvm_special_version == null) {

            jvm_special_version = getJvmSpecialVersion();

        }

        return jvm_special_version;

    }

    public static native String getJvmSpecialVersion();

    /**

     * Returns the build number of the running JVM if it's a RE build

     * It will return 0 if it's an internal build.

     * @since 1.6

     */

    public static synchronized int jvmBuildNumber() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jvm_build_number;

    }

    /**

     * Returns 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.

     * @since 1.6

     */

    public static synchronized int jdkMinorVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jdk_minor_version;

    }

    /**

     * @since 1.6

     */

        if (!versionsInitialized) {

            initVersions();

        }

    }

    /**

     * Returns the update release version of the running JDK if it's

     * a RE build. It will return 0 if it's an internal build.

     * @since 1.6

     */

    public static synchronized int jdkUpdateVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jdk_update_version;

    }

    public static synchronized String jdkSpecialVersion() {

        if (!versionsInitialized) {

            initVersions();

        }

        if (jdk_special_version == null) {

            jdk_special_version = getJdkSpecialVersion();

        }

        return jdk_special_version;

    }

    public static native String getJdkSpecialVersion();

    /**

     * Returns the build number of the running JDK if it's a RE build

     * It will return 0 if it's an internal build.

     * @since 1.6

     */

    public static synchronized int jdkBuildNumber() {

        if (!versionsInitialized) {

            initVersions();

        }

        return jdk_build_number;

    }

    // true if JVM exports the version info including the capabilities

    private static boolean jvmVersionInfoAvailable;

    private static synchronized void initVersions() {

        if (versionsInitialized) {

            return;

        }

        jvmVersionInfoAvailable = getJvmVersionInfo();

        if (!jvmVersionInfoAvailable) {

            // parse java.vm.version for older JVM before the

            // new JVM_GetVersionInfo is added.

            // valid format of the version string is:

            // n.n.n[_uu[c]][-<identifer>]-bxx

            CharSequence cs = System.getProperty("java.vm.version");

            if (cs.length() >= 5 &&

                Character.isDigit(cs.charAt(0)) && cs.charAt(1) == '.' &&

                Character.isDigit(cs.charAt(2)) && cs.charAt(3) == '.' &&

                Character.isDigit(cs.charAt(4))) {

                jvm_major_version = Character.digit(cs.charAt(0), 10);

                jvm_minor_version = Character.digit(cs.charAt(2), 10);

                cs = cs.subSequence(5, cs.length());

                if (cs.charAt(0) == '_' && cs.length() >= 3 &&

                    Character.isDigit(cs.charAt(1)) &&

                    Character.isDigit(cs.charAt(2))) {

                    int nextChar = 3;

                    try {

                        String uu = cs.subSequence(1, 3).toString();

                        jvm_update_version = Integer.valueOf(uu).intValue();

                        if (cs.length() >= 4) {

                            char c = cs.charAt(3);

                            if (c >= 'a' && c <= 'z') {

                                jvm_special_version = Character.toString(c);

                                nextChar++;

                            }

                        }

                    } catch (NumberFormatException e) {

                        // not conforming to the naming convention

                        return;

                    }

                    cs = cs.subSequence(nextChar, cs.length());

                }

                if (cs.charAt(0) == '-') {

                    // skip the first character

                    // valid format: <identifier>-bxx or bxx

                    // non-product VM will have -debug|-release appended

                    cs = cs.subSequence(1, cs.length());

                    String[] res = cs.toString().split("-");

                    for (String s : res) {

                        if (s.charAt(0) == 'b' && s.length() == 3 &&

                            Character.isDigit(s.charAt(1)) &&

                            Character.isDigit(s.charAt(2))) {

                            jvm_build_number =

                                Integer.valueOf(s.substring(1, 3)).intValue();

                            break;

                        }

                    }

                }

            }

        }

        getJdkVersionInfo();

        versionsInitialized = true;

    }

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

    // and its capabilities.

    //

    // Return false if not available which implies an old VM (Tiger or before).

    private static native boolean getJvmVersionInfo();

    private static native void getJdkVersionInfo();

}

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