/*
    * Copyright 2024 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.util.platform.linux;
   
   import java.io.File;
   
   import oshi.annotation.concurrent.ThreadSafe;
  import oshi.util.GlobalConfig;
  
  /**
   * Provides constants for paths in the {@code /sys} filesystem on Linux.
   * <p>
   * If the user desires to configure a custom {@code /sys} path, it must be declared in the OSHI configuration file or
   * updated in the {@link GlobalConfig} class prior to initializing this class.
   */
  @ThreadSafe
  public final class SysPath {
  
      /**
       * The /sys filesystem location.
       */
      public static final String SYS = querySysConfig() + "/";
  
      public static final String CPU = SYS + "devices/system/cpu/";
      public static final String DMI_ID = SYS + "devices/virtual/dmi/id/";
      public static final String NET = SYS + "class/net/";
      public static final String MODEL = SYS + "firmware/devicetree/base/model";
      public static final String POWER_SUPPLY = SYS + "class/power_supply";
      public static final String HWMON = SYS + "class/hwmon/";
      public static final String THERMAL = SYS + "class/thermal/thermal_zone";
  
      private SysPath() {
      }
  
      private static String querySysConfig() {
          String sysPath = GlobalConfig.get(GlobalConfig.OSHI_UTIL_SYS_PATH, "/sys");
          // Ensure prefix begins with path separator, but doesn't end with one
          sysPath = '/' + sysPath.replaceAll("/$|^/", "");
          if (!new File(sysPath).exists()) {
              throw new GlobalConfig.PropertyException(GlobalConfig.OSHI_UTIL_SYS_PATH, "The path does not exist");
          }
          return sysPath;
      }
  }