/*
    * Copyright 2016-2022 The OSHI Project Contributors
    * SPDX-License-Identifier: MIT
    */
   package oshi.hardware.platform.linux;
   
   import static oshi.util.Memoizer.memoize;
   
   import java.util.function.Supplier;
  
  import oshi.annotation.concurrent.Immutable;
  import oshi.driver.linux.Devicetree;
  import oshi.driver.linux.Dmidecode;
  import oshi.driver.linux.Lshal;
  import oshi.driver.linux.Lshw;
  import oshi.driver.linux.Sysfs;
  import oshi.driver.linux.proc.CpuInfo;
  import oshi.hardware.Baseboard;
  import oshi.hardware.Firmware;
  import oshi.hardware.common.AbstractComputerSystem;
  import oshi.util.Constants;
  
  /**
   * Hardware data obtained from sysfs.
   */
  @Immutable
  final class LinuxComputerSystem extends AbstractComputerSystem {
  
      private final Supplier<String> manufacturer = memoize(LinuxComputerSystem::queryManufacturer);
  
      private final Supplier<String> model = memoize(LinuxComputerSystem::queryModel);
  
      private final Supplier<String> serialNumber = memoize(LinuxComputerSystem::querySerialNumber);
  
      private final Supplier<String> uuid = memoize(LinuxComputerSystem::queryUUID);
  
      @Override
      public String getManufacturer() {
          return manufacturer.get();
      }
  
      @Override
      public String getModel() {
          return model.get();
      }
  
      @Override
      public String getSerialNumber() {
          return serialNumber.get();
      }
  
      @Override
      public String getHardwareUUID() {
          return uuid.get();
      }
  
      @Override
      public Firmware createFirmware() {
          return new LinuxFirmware();
      }
  
      @Override
      public Baseboard createBaseboard() {
          return new LinuxBaseboard();
      }
  
      private static String queryManufacturer() {
          String result = null;
          if ((result = Sysfs.querySystemVendor()) == null && (result = CpuInfo.queryCpuManufacturer()) == null) {
              return Constants.UNKNOWN;
          }
          return result;
      }
  
      private static String queryModel() {
          String result = null;
          if ((result = Sysfs.queryProductModel()) == null && (result = Devicetree.queryModel()) == null
                  && (result = Lshw.queryModel()) == null) {
              return Constants.UNKNOWN;
          }
          return result;
      }
  
      private static String querySerialNumber() {
          String result = null;
          if ((result = Sysfs.queryProductSerial()) == null && (result = Dmidecode.querySerialNumber()) == null
                  && (result = Lshal.querySerialNumber()) == null && (result = Lshw.querySerialNumber()) == null) {
              return Constants.UNKNOWN;
          }
          return result;
      }
  
      private static String queryUUID() {
          String result = null;
          if ((result = Sysfs.queryUUID()) == null && (result = Dmidecode.queryUUID()) == null
                  && (result = Lshal.queryUUID()) == null && (result = Lshw.queryUUID()) == null) {
              return Constants.UNKNOWN;
          }
          return result;
     }
 }