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A themeable Look and Feel for java swing.
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/*
 * MIT License
 *
 * Copyright (c) 2019 Jannis Weis
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.github.weisj.darklaf.util;


import org.jetbrains.annotations.Contract;

/**
 * @author Konstantin Bulenkov
 */
public class SystemInfo {
    public static final String X86 = "32";
    public static final String X64 = "64";
    public static final String OS_NAME = System.getProperty("os.name");
    public static final String OS_VERSION = System.getProperty("os.version").toLowerCase();
    public static final String JAVA_VERSION = System.getProperty("java.version");
    public static final String JAVA_RUNTIME_VERSION = System.getProperty("java.runtime.version");
    public static final boolean isWindows;
    public static final boolean isOS2;
    public static final boolean isMac;
    public static final boolean isLinux;
    public static final boolean isUnix;
    public static final boolean isFileSystemCaseSensitive;
    public static final boolean isAppleJvm;
    public static final boolean isOracleJvm;
    public static final boolean isSunJvm;
    public static final String jreArchitecture = System.getProperty("sun.arch.data.model");
    public static final boolean isX86;
    public static final boolean isX64;
    public static final boolean isUndefined;
    protected static final String _OS_NAME;

    static {
        _OS_NAME = OS_NAME.toLowerCase();
        isWindows = _OS_NAME.startsWith("windows");
        isOS2 = _OS_NAME.startsWith("os/2") || _OS_NAME.startsWith("os2");
        isMac = _OS_NAME.startsWith("mac");
        isLinux = _OS_NAME.startsWith("linux");
        isUnix = !isWindows && !isOS2;
        isFileSystemCaseSensitive = isUnix && !isMac;
        isAppleJvm = isAppleJvm();
        isOracleJvm = isOracleJvm();
        isSunJvm = isSunJvm();
        isX64 = X64.equals(jreArchitecture);
        isX86 = X86.equals(jreArchitecture);
        isUndefined = !isX86 & !isX64;
    }

    @Contract(pure = true)
    public SystemInfo() {
    }

    public static boolean isOsVersionAtLeast(final String version) {
        return compareVersionNumbers(OS_VERSION, version) >= 0;
    }

    public static int compareVersionNumbers(final String v1, final String v2) {
        if (v1 == null && v2 == null) {
            return 0;
        } else if (v1 == null) {
            return -1;
        } else if (v2 == null) {
            return 1;
        } else {
            String[] part1 = v1.split("[.\\_-]");
            String[] part2 = v2.split("[._\\-]");

            int idx;
            for (idx = 0; idx < part1.length && idx < part2.length; ++idx) {
                String p1 = part1[idx];
                String p2 = part2[idx];
                int cmp;
                if (p1.matches("\\d+") && p2.matches("\\d+")) {
                    cmp = (Integer.valueOf(p1)).compareTo(Integer.valueOf(p2));
                } else {
                    cmp = part1[idx].compareTo(part2[idx]);
                }

                if (cmp != 0) {
                    return cmp;
                }
            }

            if (part1.length == part2.length) {
                return 0;
            } else {
                return part1.length > idx ? 1 : -1;
            }
        }
    }

    public static boolean isJavaVersionAtLeast(final String v) {
        return StringUtil.compareVersionNumbers(JAVA_RUNTIME_VERSION, v) >= 0;
    }

    private static boolean isOracleJvm() {
        String vendor = getJavaVmVendor();
        return vendor != null && StringUtil.containsIgnoreCase(vendor, "Oracle");
    }

    public static String getJavaVmVendor() {
        return System.getProperty("java.vm.vendor");
    }

    private static boolean isSunJvm() {
        String vendor = getJavaVmVendor();
        return vendor != null && StringUtil.containsIgnoreCase(vendor, "Sun") && StringUtil.containsIgnoreCase(vendor, "Microsystems");
    }

    private static boolean isAppleJvm() {
        String vendor = getJavaVmVendor();
        return vendor != null && StringUtil.containsIgnoreCase(vendor, "Apple");
    }
}