UnrealEngineUWP/Engine/Source/Programs/AutomationTool/AutomationUtils/Platform.cs

// Copyright Epic Games, Inc. All Rights Reserved.

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Reflection;
using UnrealBuildTool;
using EpicGames.Core;

namespace AutomationTool
{
	public interface ITurnkeyContext
	{
		string RetrieveFileSource(string Name, string InType = "Misc", string InPlatform = null, string SubType = null);
		string RetrieveFileSource(object HintObject);
		string GetVariable(string VariableName);
		int RunExternalCommand(string Command, string Params, bool bRequiresPrivilegeElevation, bool bUnattended, bool bCreateWindow);
		void Log(string Message);
		void ReportError(string Message);
		void PauseForUser(string Message); 
	}

	//public interface InputOutput
	//{
	//	string RetrieveByTags(string[] RequiredTags, string[] PreferredTags, Dictionary<string, string> ExtraVariables = null);
	//}

	public class DeviceInfo
	{
		public DeviceInfo(UnrealTargetPlatform Platform)
		{
			this.Platform = Platform;
		}

		public DeviceInfo(UnrealTargetPlatform Platform, string Name, string Id, string SoftwareVersion, string Type, bool bIsDefault, bool bCanConnect)
		{
			this.Platform = Platform;
			this.Name = Name;
			this.Id = Id;
			this.SoftwareVersion = SoftwareVersion;
			this.Type = Type;
			this.bIsDefault = bIsDefault;
			this.bCanConnect = bCanConnect;
		}

		public UnrealTargetPlatform Platform;
		public string Name;
		public string Id;
		public string SoftwareVersion;
		public string Type;
		public bool bIsDefault = false;
		// is the device able to be connected to (this is more about able to flash SDK or run, not about matching SDK version)
		// if false, any of the above fields are suspect, especually SoftwareVersion
		public bool bCanConnect = true;
	}

	/// <summary>
	/// Holds information for targeting specific platform (platform type + cook flavor)
	/// </summary>
	public struct TargetPlatformDescriptor
	{
		public UnrealTargetPlatform Type;
		public string CookFlavor;

		public TargetPlatformDescriptor(UnrealTargetPlatform InType)
		{
			Type = InType;
			CookFlavor = "";
		}
		public TargetPlatformDescriptor(UnrealTargetPlatform InType, string InCookFlavor)
		{
			Type = InType;
			CookFlavor = InCookFlavor;
		}

		public override string ToString()
		{
			return Type.ToString();
		}
	}

	/// <summary>
	/// Platform abstraction layer.
	/// </summary>
	public class Platform : CommandUtils
	{
		private static Dictionary<TargetPlatformDescriptor, Platform> AllPlatforms = new Dictionary<TargetPlatformDescriptor, Platform>();
		internal static void InitializePlatforms(Assembly[] AssembliesWithPlatforms = null)
		{
			LogVerbose("Creating platforms.");

			// Create all available platforms.
			foreach (var ScriptAssembly in (AssembliesWithPlatforms != null ? AssembliesWithPlatforms : AppDomain.CurrentDomain.GetAssemblies()))
			{
				CreatePlatformsFromAssembly(ScriptAssembly);
			}
			// Create dummy platforms for platforms we don't support
			foreach (UnrealTargetPlatform PlatformType in UnrealTargetPlatform.GetValidPlatforms())
			{
				var TargetDesc = new TargetPlatformDescriptor(PlatformType);
				Platform ExistingInstance;
				if (AllPlatforms.TryGetValue(TargetDesc, out ExistingInstance) == false)
				{
					LogVerbose("Creating placeholder platform for target: {0}", TargetDesc.Type);
					AllPlatforms.Add(TargetDesc, new Platform(TargetDesc.Type));
				}
			}
		}

		private static void CreatePlatformsFromAssembly(Assembly ScriptAssembly)
		{
			LogVerbose("Looking for platforms in {0}", ScriptAssembly.Location);
			Type[] AllTypes = null;
			try
			{
				AllTypes = ScriptAssembly.GetTypes();
			}
			catch (Exception Ex)
			{
				LogError("Failed to get assembly types for {0}", ScriptAssembly.Location);
				if (Ex is ReflectionTypeLoadException)
				{
					var TypeLoadException = (ReflectionTypeLoadException)Ex;
					if (!IsNullOrEmpty(TypeLoadException.LoaderExceptions))
					{
						LogError("Loader Exceptions:");
						foreach (var LoaderException in TypeLoadException.LoaderExceptions)
						{
							LogError(LogUtils.FormatException(LoaderException));
						}
					}
					else
					{
						LogError("No Loader Exceptions available.");
					}
				}
				// Re-throw, this is still a critical error!
				throw Ex;
			}
			foreach (var PotentialPlatformType in AllTypes)
			{
				if (PotentialPlatformType != typeof(Platform) && typeof(Platform).IsAssignableFrom(PotentialPlatformType) && !PotentialPlatformType.IsAbstract)
				{
					LogVerbose("Creating platform {0} from {1}.", PotentialPlatformType.Name, ScriptAssembly.Location);
					var PlatformInstance = Activator.CreateInstance(PotentialPlatformType) as Platform;
					var PlatformDesc = PlatformInstance.GetTargetPlatformDescriptor();

					Platform ExistingInstance;
					if (!AllPlatforms.TryGetValue(PlatformDesc, out ExistingInstance))
					{
						AllPlatforms.Add(PlatformDesc, PlatformInstance);
					}
					else
					{
						if (ExistingInstance.GetType() != PlatformInstance.GetType())
						{
							LogWarning("Platform {0} already exists", PotentialPlatformType.Name);
						}
					}
				}
			}
		}

		protected UnrealTargetPlatform TargetPlatformType;
		protected UnrealTargetPlatform TargetIniPlatformType;

		public Platform(UnrealTargetPlatform PlatformType)
		{
			TargetPlatformType = PlatformType;
			TargetIniPlatformType = PlatformType;

			Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);
		}

		/// <summary>
		/// Allow the platform to alter the ProjectParams
		/// </summary>
		/// <param name="ProjParams"></param>
		public virtual void PlatformSetupParams(ref ProjectParams ProjParams)
		{

		}

		public virtual TargetPlatformDescriptor GetTargetPlatformDescriptor()
		{
			return new TargetPlatformDescriptor(TargetPlatformType, "");
		}


		#region Turnkey

		public virtual DeviceInfo[] GetDevices()
		{
			return null;
		}

		public virtual bool InstallSDK(BuildCommand BuildCommand, ITurnkeyContext TurnkeyContext, DeviceInfo Device, bool bUnattended)
		{
			string Command, Params;

			bool bRequiresPrivilegeElevation = false;
			bool bCreateWindow = false;
			if (Device != null && GetDeviceUpdateSoftwareCommand(out Command, out Params, ref bRequiresPrivilegeElevation, ref bCreateWindow, TurnkeyContext, Device))
			{
				int ExitCode = TurnkeyContext.RunExternalCommand(Command, Params, bRequiresPrivilegeElevation, bUnattended, bCreateWindow);
				return OnSDKInstallComplete(ExitCode, TurnkeyContext, Device);
			}
			else if (Device == null && GetSDKInstallCommand(out Command, out Params, ref bRequiresPrivilegeElevation, ref bCreateWindow, TurnkeyContext))
			{
				int ExitCode = TurnkeyContext.RunExternalCommand(Command, Params, bRequiresPrivilegeElevation, bUnattended, bCreateWindow);
				return OnSDKInstallComplete(ExitCode, TurnkeyContext, null);
			}

			return false;
		}

		/// <summary>
		/// Return a list of versions that will be used to create "fake" FileSource objects which are used
		/// for install Sdks where no file downloads are needed
		/// </summary>
		/// <returns></returns>
		public virtual string[] GetCodeSpecifiedSdkVersions()
		{
			return new string[] { };
		}

		public virtual bool GetSDKInstallCommand(out string Command, out string Params, ref bool bRequiresPrivilegeElevation, ref bool bCreateWindow, ITurnkeyContext TurnkeyContext)
		{
			Command = null;
			Params = null;
			return false;
		}

		public virtual bool GetDeviceUpdateSoftwareCommand(out string Command, out string Params, ref bool bRequiresPrivilegeElevation, ref bool bCreateWindow, ITurnkeyContext TurnkeyContext, DeviceInfo Device = null)
		{
			Command = null;
			Params = null;
			return false;
		}

		/// <summary>
		/// Let's the platform handle the result of 
		/// </summary>
		/// <param name="ExitCode"></param>
		/// <param name="Device"></param>
		/// <returns>True if the installation was a success (defaults to ExitCode == 0)</returns>
		public virtual bool OnSDKInstallComplete(int ExitCode, ITurnkeyContext TurnkeyContext, DeviceInfo Device)
		{
			return ExitCode == 0;
		}

		public virtual string GetSDKCreationHelp()
		{
			return null;
		}

		public virtual bool UpdateHostPrerequisites(BuildCommand Command, ITurnkeyContext TurnkeyContext, bool bVerifyOnly)
		{
			return true;
		}

		public virtual bool UpdateDevicePrerequisites(DeviceInfo Device, BuildCommand Command, ITurnkeyContext TurnkeyContext, bool bVerifyOnly)
		{
			return true;
		}

		#endregion

		/// <summary>
		/// Package files for the current platform.
		/// </summary>
		/// <param name="ProjectPath"></param>
		/// <param name="ProjectExeFilename"></param>
		public virtual void Package(ProjectParams Params, DeploymentContext SC, int WorkingCL)
		{
			throw new AutomationException("{0} does not yet implement Packaging.", PlatformType);
		}

		/// <summary>
		/// Does the reverse of the output from the package process
		/// </summary>
		/// <param name="SourcePath"></param>
		/// <param name="DestinationPath"></param>
		public virtual void ExtractPackage(ProjectParams Params, string SourcePath, string DestinationPath)
		{
			throw new AutomationException("{0} does not yet implement ExtractPackage.", PlatformType);
		}

		/// <summary>
		/// Allow platform to do platform specific work on archived project before it's deployed.
		/// </summary>
		/// <param name="Params"></param>
		/// <param name="SC"></param>
		public virtual void ProcessArchivedProject(ProjectParams Params, DeploymentContext SC)
		{
		}

		/// <summary>
		/// Get all connected device names for this platform
		/// </summary>
		/// <param name="Params"></param>
		/// <param name="SC"></param>
		public virtual void GetConnectedDevices(ProjectParams Params, out List<string> Devices)
		{
			Devices = null;
			LogWarning("{0} does not implement GetConnectedDevices", PlatformType);
		}

		/// <summary>
		/// Allow platform specific work prior to touching the staging directory
		/// </summary>
		/// <param name="Params"></param>
		/// <param name="SC"></param>
		public virtual void PreStage(ProjectParams Params, DeploymentContext SC)
		{
			// do nothing on most platforms
		}


		/// <summary>
		/// Deploy the application on the current platform
		/// </summary>
		/// <param name="Params"></param>
		/// <param name="SC"></param>
		public virtual void Deploy(ProjectParams Params, DeploymentContext SC)
		{
			LogWarning("{0} does not implement Deploy...", PlatformType);
		}

		/// <summary>
		/// Run the client application on the platform
		/// </summary>
		/// <param name="ClientRunFlags"></param>
		/// <param name="ClientApp"></param>
		/// <param name="ClientCmdLine"></param>
		public virtual IProcessResult RunClient(ERunOptions ClientRunFlags, string ClientApp, string ClientCmdLine, ProjectParams Params)
		{
			PushDir(Path.GetDirectoryName(ClientApp));
			// Always start client process and don't wait for exit.
			IProcessResult ClientProcess = Run(ClientApp, ClientCmdLine, null, ClientRunFlags | ERunOptions.NoWaitForExit);
			PopDir();

			return ClientProcess;
		}

		/// <summary>
		/// Downloads file from target device to local pc
		/// </summary>
		/// <param name="RemoteFilePath"></param>
		/// <param name="LocalFile"></param>
		/// <param name="Params"></param>
		public virtual void GetTargetFile(string RemoteFilePath, string LocalFile, ProjectParams Params)
		{
			throw new NotImplementedException();
		}

		/// <summary>
		/// Allow platform specific clean-up or detection after client has run
		/// </summary>
		/// <param name="ClientRunFlags"></param>
		public virtual void PostRunClient(IProcessResult Result, ProjectParams Params)
		{
			// do nothing in the default case
		}

		/// <summary>
		/// Get the platform-specific name for the executable (with out the file extension)
		/// </summary>
		/// <param name="InExecutableName"></param>
		/// <returns></returns>
		public virtual string GetPlatformExecutableName(string InExecutableName)
		{
			return InExecutableName;
		}

		public virtual List<FileReference> GetExecutableNames(DeploymentContext SC)
		{
			List<FileReference> ExecutableNames = new List<FileReference>();
			foreach (StageTarget Target in SC.StageTargets)
			{
				foreach (BuildProduct Product in Target.Receipt.BuildProducts)
				{
					if (Product.Type == BuildProductType.Executable)
					{
						FileReference BuildProductFile = Product.Path;
						if (BuildProductFile.IsUnderDirectory(SC.ProjectRoot))
						{
							ExecutableNames.Add(FileReference.Combine(SC.RuntimeProjectRootDir, BuildProductFile.MakeRelativeTo(SC.ProjectRoot)));
						}
						else
						{
							ExecutableNames.Add(FileReference.Combine(SC.RuntimeRootDir, BuildProductFile.MakeRelativeTo(RootDirectory)));
						}
					}
				}
			}
			return ExecutableNames;
		}

		/// <summary>
		/// Get the files to deploy, specific to this platform, typically binaries
		/// </summary>
		/// <param name="SC">Deployment Context</param>
		public virtual void GetFilesToDeployOrStage(ProjectParams Params, DeploymentContext SC)
		{
			throw new AutomationException("{0} does not yet implement GetFilesToDeployOrStage.", PlatformType);
		}

		/// <summary>
		/// Called after CopyUsingStagingManifest.  Does anything platform specific that requires a final list of staged files.
		/// e.g.  PlayGo emulation control file generation for PS4.
		/// </summary>
		/// <param name="Params"></param>
		/// <param name="SC"></param>
		public virtual void PostStagingFileCopy(ProjectParams Params, DeploymentContext SC)
		{
		}

		/// <summary>
		/// Get the files to deploy, specific to this platform, typically binaries
		/// </summary>
		/// <param name="SC">Deployment Context</param>
		public virtual void GetFilesToArchive(ProjectParams Params, DeploymentContext SC)
		{
			SC.ArchiveFiles(SC.StageDirectory.FullName);
		}

		/// <summary>
		/// Gets cook platform name for this platform.
		/// </summary>
		/// <param name="bDedicatedServer">True if cooking for dedicated server</param>
		/// <param name="bIsClientOnly">True if cooking for client only</param>
		/// <returns>Cook platform string.</returns>
		public virtual string GetCookPlatform(bool bDedicatedServer, bool bIsClientOnly)
		{
			throw new AutomationException("{0} does not yet implement GetCookPlatform.", PlatformType);
		}

		/// <summary>
		/// Gets extra cook commandline arguments for this platform.
		/// </summary>
		/// <param name="Params"> ProjectParams </param>
		/// <returns>Cook platform string.</returns>
		public virtual string GetCookExtraCommandLine(ProjectParams Params)
		{
			return "";
		}

		/// <summary>
		/// Gets extra maps needed on this platform.
		/// </summary>
		/// <returns>extra maps</returns>
		public virtual List<string> GetCookExtraMaps()
		{
			return new List<string>();
		}

		/// <summary>
		/// Get a release pak file path, if we are currently building a patch then get the previous release pak file path, if we are creating a new release this will be the output path
		/// </summary>
		/// <param name="SC"></param>
		/// <param name="Params"></param>
		/// <param name="PakName"></param>
		/// <returns></returns>
		public virtual string GetReleasePakFilePath(DeploymentContext SC, ProjectParams Params, string PakName)
		{
			if (Params.IsGeneratingPatch)
			{
				return CombinePaths(Params.GetBasedOnReleaseVersionPath(SC, Params.Client), PakName);
			}
			else
			{
				return CombinePaths(Params.GetCreateReleaseVersionPath(SC, Params.Client), PakName);
			}
		}

		/// <summary>
		/// Gets editor cook platform name for this platform. Cooking the editor is not useful, but this is used to fill the derived data cache
		/// </summary>
		/// <returns>Cook platform string.</returns>
		public virtual string GetEditorCookPlatform()
		{
			return GetCookPlatform(false, false);
		}

		/// <summary>
		/// return true if we need to change the case of filenames outside of pak files
		/// </summary>
		/// <param name="FileType" The staged file type to check (UFS vs SsytemNonUFS, etc)
		/// <returns>true if files should be lower-cased during staging, for the given filetype</returns>
		public virtual bool DeployLowerCaseFilenames(StagedFileType FileType)
		{
			return false;
		}

		/// <summary>
		/// return true if we need to change the case of a particular file
		/// </summary>
		/// <param name="FileType" The staged file type to check (UFS vs SsytemNonUFS, etc)
		/// <returns>true if files should be lower-cased during staging, for the given filetype</returns>
		public virtual bool DeployLowerCaseFile(FileReference File, StagedFileType FileType)
		{
			return DeployLowerCaseFilenames(FileType);
		}


		/// <summary>
		/// Converts local path to target platform path.
		/// </summary>
		/// <param name="LocalPath">Local path.</param>
		/// <param name="LocalRoot">Local root.</param>
		/// <returns>Local path converted to device format path.</returns>
		public virtual string LocalPathToTargetPath(string LocalPath, string LocalRoot)
		{
			return LocalPath;
		}

		/// <summary>
		/// Update the build agenda for this platform
		/// </summary>
		/// <param name="Agenda">Agenda to update</param>
		/// <param name="ExtraBuildProducts">Any additional files that will be created</param>
		public virtual void MakeAgenda(UE4Build.BuildAgenda Agenda, List<string> ExtraBuildProducts)
		{
		}

		/// <summary>
		/// Returns a list of the compiler produced debug file extensions
		/// </summary>
		/// <returns>a list of the compiler produced debug file extensions</returns>
		public virtual List<string> GetDebugFileExtensions()
		{
			return new List<string>();
		}

		/// <summary>
		/// UnrealTargetPlatform type for this platform.
		/// </summary>
		public UnrealTargetPlatform PlatformType
		{
			get { return TargetPlatformType; }
		}

		/// <summary>
		/// UnrealTargetPlatform type for this platform.
		/// </summary>
		public UnrealTargetPlatform IniPlatformType
		{
			get { return TargetIniPlatformType; }
		}

		/// <summary>
		/// True if this platform is supported.
		/// </summary>
		public virtual bool IsSupported
		{
			get { return false; }
		}

		/// <summary>
		/// True if this platform requires UFE for deploying
		/// </summary>
		public virtual bool DeployViaUFE
		{
			get { return false; }
		}

		/// <summary>
		/// True if this platform requires UFE for launching
		/// </summary>
		public virtual bool LaunchViaUFE
		{
			get { return false; }
		}

		/// <summary>
		/// Gets extra launch commandline arguments for this platform.
		/// </summary>
		/// <param name="Params"> ProjectParams </param>
		/// <returns>Launch platform string.</returns>
		public virtual string GetLaunchExtraCommandLine(ProjectParams Params)
		{
			return "";
		}

		/// <summary>
		/// True if this platform can write to the abslog path that's on the host desktop.
		/// </summary>
		public virtual bool UseAbsLog
		{
			get { return BuildHostPlatform.Current.Platform == PlatformType; }
		}

		/// <summary>
		/// Remaps the given content directory to its final location
		/// </summary>
		public virtual StagedFileReference Remap(StagedFileReference Dest)
		{
			return Dest;
		}

		/// <summary>
		/// Tri-state - The intent is to override command line parameters for pak if needed per platform.
		/// </summary>
		///
		public enum PakType { Always, Never, DontCare };

		public virtual PakType RequiresPak(ProjectParams Params)
		{
			return PakType.DontCare;
		}

		/// <summary>
		/// Returns platform specific command line options for UnrealPak
		/// </summary>
		public virtual string GetPlatformPakCommandLine(ProjectParams Params, DeploymentContext SC)
		{
			return "";
		}

		/// <summary>
		/// Returns platform specific command line options for the IoStore cmdlet
		/// </summary>
		public virtual string GetPlatformIoStoreCommandLine(ProjectParams Params, DeploymentContext SC)
		{
			return "";
		}

		/// <summary>
		/// True if this platform is supported.
		/// </summary>
		public virtual bool SupportsMultiDeviceDeploy
		{
			get { return false; }
		}

		/// <summary>
		/// Returns true if the platform wants patches to generate a small .pak file containing the difference
		/// of current data against a shipped pak file.
		/// </summary>
		/// <returns></returns>
		public virtual bool GetPlatformPatchesWithDiffPak(ProjectParams Params, DeploymentContext SC)
		{
			return true;
		}

		/// <summary>
		///  Returns whether the platform requires a package to deploy to a device
		/// </summary>
		public virtual bool RequiresPackageToDeploy
		{
			get { return false; }
		}

		public virtual HashSet<StagedFileReference> GetFilesForCRCCheck()
		{
			string CmdLine = "UE4CommandLine.txt";
			// using SystemNonUFS because that is how it's staged in CreateStagingManifest
			if (DeployLowerCaseFilenames(StagedFileType.SystemNonUFS))
			{
				CmdLine = CmdLine.ToLowerInvariant();
			}
			return new HashSet<StagedFileReference>() { new StagedFileReference(CmdLine) };
		}

		public virtual void StripSymbols(FileReference SourceFile, FileReference TargetFile)
		{
			if (SourceFile == TargetFile)
			{
				CommandUtils.LogWarning("StripSymbols() has not been implemented for {0}", PlatformType.ToString());
			}
			else
			{
				CommandUtils.LogWarning("StripSymbols() has not been implemented for {0}; copying files", PlatformType.ToString());
				File.Copy(SourceFile.FullName, TargetFile.FullName, true);
			}
		}

		public virtual bool PublishSymbols(DirectoryReference SymbolStoreDirectory, List<FileReference> Files, string Product, string BuildVersion = null)
		{
			CommandUtils.LogWarning("PublishSymbols() has not been implemented for {0}", PlatformType.ToString());
			return false;
		}

		/// <summary>
		/// When overridden, returns the directory structure of the platform's symbol server.
		/// Each element is a semi-colon separated string of possible directory names.
		/// The * wildcard is allowed in any entry. {0} will be substituted for a custom filter string.
		/// </summary>
		public virtual string[] SymbolServerDirectoryStructure
		{
			get { return null; }
		}

		/// <summary>
		/// When overridden to return true, allows the AgeStoreTask to delete individual files in a single symbol folder,
		/// rather than requiring all files in a symbol folder to be out of date before deleting the entire directory.
		/// </summary>
		public virtual bool SymbolServerDeleteIndividualFiles
		{
			get { return false; }
		}

		/// <summary>
		/// If true, indicates the platform's symbol server directory must be locked for
		/// exclusive access before any operation is performed on it. Platforms may override
		/// this to disable if their tools support concurrent access to the symbol server directory.
		/// </summary>
		public virtual bool SymbolServerRequiresLock
		{
			get { return true; }
		}

		public virtual void PreBuildAgenda(UE4Build Build, UE4Build.BuildAgenda Agenda, ProjectParams Params)
		{

		}

		/// <summary>
		/// General purpose command to run generic string commands inside the platform interfeace
		/// </summary>
		/// <param name="Command"></param>
		public virtual int RunCommand(string Command)
		{
			return 0;
		}

		/// <summary>
		/// Determines whether we should stage a UE4CommandLine.txt for this platform
		/// </summary>
		public virtual bool ShouldStageCommandLine(ProjectParams Params, DeploymentContext SC)
		{
			return true;
		}

		/// <summary>
		/// Only relevant for the mac and PC at the moment. Example calling the Mac platform with PS4 as an arg will return false. Can't compile or cook for the PS4 on the mac.
		/// </summary>
		public virtual bool CanHostPlatform(UnrealTargetPlatform Platform)
		{
			return false;
		}

		/// <summary>
		/// Allows some platforms to not be compiled, for instance when BuildCookRun -build is performed
		/// </summary>
		/// <returns><c>true</c> if this instance can be compiled; otherwise, <c>false</c>.</returns>
		public virtual bool CanBeCompiled()
		{
			return true;
		}

		public virtual bool RetrieveDeployedManifests(ProjectParams Params, DeploymentContext SC, string DeviceName, out List<string> UFSManifests, out List<string> NonUFSManifests)
		{
			UFSManifests = null;
			NonUFSManifests = null;
			return false;
		}

		public virtual bool SignExecutables(DeploymentContext SC, ProjectParams Params)
		{
			return true;
		}

		public virtual UnrealTargetPlatform[] GetStagePlatforms()
		{
			return new UnrealTargetPlatform[] { PlatformType };
		}

		public virtual DirectoryReference GetProjectRootForStage(DirectoryReference RuntimeRoot, StagedDirectoryReference RelativeProjectRootForStage)
		{
			return DirectoryReference.Combine(RuntimeRoot, RelativeProjectRootForStage.Name);
		}

		// let the platform set the exe extension if it chooses (otherwise, use
		// the switch statement in GetExeExtension below)
		protected virtual string GetPlatformExeExtension()
		{
			return null;
		}

		public static string GetExeExtension(UnrealTargetPlatform Target)
		{
			Platform Plat = GetPlatform(Target);
			string PlatformExeExtension = Plat.GetPlatformExeExtension();
			if (!string.IsNullOrEmpty(PlatformExeExtension))
			{
				return PlatformExeExtension;
			}

			if (Target == UnrealTargetPlatform.Win64 || Target == UnrealTargetPlatform.HoloLens)
			{
				return ".exe";
			}
			if (Target == UnrealTargetPlatform.PS4)
			{
				return ".self";
			}
			if (Target == UnrealTargetPlatform.IOS)
			{
				return ".stub";
			}
			if (Target == UnrealTargetPlatform.Linux || Target == UnrealTargetPlatform.LinuxAArch64)
			{
				return "";
			}
			if (Target == UnrealTargetPlatform.Mac)
			{
				return ".app";
			}

			return String.Empty;
		}

		public static Dictionary<TargetPlatformDescriptor, Platform> Platforms
		{
			get { return AllPlatforms; }
		}

		public static Platform GetPlatform(UnrealTargetPlatform PlatformType)
		{
			TargetPlatformDescriptor Desc = new TargetPlatformDescriptor(PlatformType);
			return AllPlatforms[Desc];
		}

		public static Platform GetPlatform(UnrealTargetPlatform PlatformType, string CookFlavor)
		{
			TargetPlatformDescriptor Desc = new TargetPlatformDescriptor(PlatformType, CookFlavor);
			return AllPlatforms[Desc];
		}

		public static bool IsValidTargetPlatform(TargetPlatformDescriptor PlatformDesc)
		{
			return AllPlatforms.ContainsKey(PlatformDesc);
		}

		public static List<TargetPlatformDescriptor> GetValidTargetPlatforms(UnrealTargetPlatform PlatformType, List<string> CookFlavors)
		{
			List<TargetPlatformDescriptor> ValidPlatforms = new List<TargetPlatformDescriptor>();
			if (!CommandUtils.IsNullOrEmpty(CookFlavors))
			{
				foreach (string CookFlavor in CookFlavors)
				{
					TargetPlatformDescriptor TargetDesc = new TargetPlatformDescriptor(PlatformType, CookFlavor);
					if (IsValidTargetPlatform(TargetDesc))
					{
						ValidPlatforms.Add(TargetDesc);
					}
				}
			}

			// In case there are no flavors specified or this platform type does not care/support flavors add it as generic platform
			if (ValidPlatforms.Count == 0)
			{
				TargetPlatformDescriptor TargetDesc = new TargetPlatformDescriptor(PlatformType);
				if (IsValidTargetPlatform(TargetDesc))
				{
					ValidPlatforms.Add(TargetDesc);
				}
			}

			return ValidPlatforms;
		}
	}
}