java/droidstubs.go

// Copyright 2021 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package java

import (
	"fmt"
	"path/filepath"
	"regexp"
	"strings"

	"github.com/google/blueprint/proptools"

	"android/soong/android"
	"android/soong/java/config"
	"android/soong/remoteexec"
)

// The values allowed for Droidstubs' Api_levels_sdk_type
var allowedApiLevelSdkTypes = []string{"public", "system", "module-lib", "system-server"}

type StubsType int

const (
	Everything StubsType = iota
	Runtime
	Exportable
	Unavailable
)

func (s StubsType) String() string {
	switch s {
	case Everything:
		return "everything"
	case Runtime:
		return "runtime"
	case Exportable:
		return "exportable"
	default:
		return ""
	}
}

func init() {
	RegisterStubsBuildComponents(android.InitRegistrationContext)
}

func RegisterStubsBuildComponents(ctx android.RegistrationContext) {
	ctx.RegisterModuleType("stubs_defaults", StubsDefaultsFactory)

	ctx.RegisterModuleType("droidstubs", DroidstubsFactory)
	ctx.RegisterModuleType("droidstubs_host", DroidstubsHostFactory)

	ctx.RegisterModuleType("prebuilt_stubs_sources", PrebuiltStubsSourcesFactory)
}

// Droidstubs
type Droidstubs struct {
	Javadoc
	embeddableInModuleAndImport

	properties              DroidstubsProperties
	apiFile                 android.Path
	removedApiFile          android.Path
	nullabilityWarningsFile android.WritablePath

	checkCurrentApiTimestamp      android.WritablePath
	updateCurrentApiTimestamp     android.WritablePath
	checkLastReleasedApiTimestamp android.WritablePath
	apiLintTimestamp              android.WritablePath
	apiLintReport                 android.WritablePath

	checkNullabilityWarningsTimestamp android.WritablePath

	annotationsZip android.WritablePath
	apiVersionsXml android.WritablePath

	metadataZip android.WritablePath
	metadataDir android.WritablePath

	exportableApiFile                 android.WritablePath
	exportableRemovedApiFile          android.WritablePath
	exportableNullabilityWarningsFile android.WritablePath
	exportableAnnotationsZip          android.WritablePath
	exportableApiVersionsXml          android.WritablePath
	exportableMetadataZip             android.WritablePath
	exportableMetadataDir             android.WritablePath
}

type DroidstubsProperties struct {
	// The generated public API filename by Metalava, defaults to <module>_api.txt
	Api_filename *string

	// the generated removed API filename by Metalava, defaults to <module>_removed.txt
	Removed_api_filename *string

	Check_api struct {
		Last_released ApiToCheck

		Current ApiToCheck

		Api_lint struct {
			Enabled *bool

			// If set, performs api_lint on any new APIs not found in the given signature file
			New_since *string `android:"path"`

			// If not blank, path to the baseline txt file for approved API lint violations.
			Baseline_file *string `android:"path"`
		}
	}

	// user can specify the version of previous released API file in order to do compatibility check.
	Previous_api *string `android:"path"`

	// is set to true, Metalava will allow framework SDK to contain annotations.
	Annotations_enabled *bool

	// a list of top-level directories containing files to merge qualifier annotations (i.e. those intended to be included in the stubs written) from.
	Merge_annotations_dirs []string

	// a list of top-level directories containing Java stub files to merge show/hide annotations from.
	Merge_inclusion_annotations_dirs []string

	// a file containing a list of classes to do nullability validation for.
	Validate_nullability_from_list *string

	// a file containing expected warnings produced by validation of nullability annotations.
	Check_nullability_warnings *string

	// if set to true, allow Metalava to generate doc_stubs source files. Defaults to false.
	Create_doc_stubs *bool

	// if set to true, cause Metalava to output Javadoc comments in the stubs source files. Defaults to false.
	// Has no effect if create_doc_stubs: true.
	Output_javadoc_comments *bool

	// if set to false then do not write out stubs. Defaults to true.
	//
	// TODO(b/146727827): Remove capability when we do not need to generate stubs and API separately.
	Generate_stubs *bool

	// if set to true, provides a hint to the build system that this rule uses a lot of memory,
	// which can be used for scheduling purposes
	High_mem *bool

	// if set to true, Metalava will allow framework SDK to contain API levels annotations.
	Api_levels_annotations_enabled *bool

	// Apply the api levels database created by this module rather than generating one in this droidstubs.
	Api_levels_module *string

	// the dirs which Metalava extracts API levels annotations from.
	Api_levels_annotations_dirs []string

	// the sdk kind which Metalava extracts API levels annotations from. Supports 'public', 'system', 'module-lib' and 'system-server'; defaults to public.
	Api_levels_sdk_type *string

	// the filename which Metalava extracts API levels annotations from. Defaults to android.jar.
	Api_levels_jar_filename *string

	// if set to true, collect the values used by the Dev tools and
	// write them in files packaged with the SDK. Defaults to false.
	Write_sdk_values *bool

	// path or filegroup to file defining extension an SDK name <-> numerical ID mapping and
	// what APIs exist in which SDKs; passed to metalava via --sdk-extensions-info
	Extensions_info_file *string `android:"path"`

	// API surface of this module. If set, the module contributes to an API surface.
	// For the full list of available API surfaces, refer to soong/android/sdk_version.go
	Api_surface *string

	// a list of aconfig_declarations module names that the stubs generated in this module
	// depend on.
	Aconfig_declarations []string
}

// Used by xsd_config
type ApiFilePath interface {
	ApiFilePath() android.Path
}

type ApiStubsSrcProvider interface {
	StubsSrcJar() android.Path
}

type ExportableApiStubsSrcProvider interface {
	ExportableStubsSrcJar() android.Path
}

// Provider of information about API stubs, used by java_sdk_library.
type ApiStubsProvider interface {
	AnnotationsZip() android.Path
	ApiFilePath
	RemovedApiFilePath() android.Path

	ApiStubsSrcProvider
}

type ExportableApiStubsProvider interface {
	ExportableAnnotationsZip() android.Path
	ExportableApiFilePath() android.Path
	ExportableRemovedApiFilePath() android.Path

	ExportableApiStubsSrcProvider
}

type currentApiTimestampProvider interface {
	CurrentApiTimestamp() android.Path
}

type annotationFlagsParams struct {
	migratingNullability    bool
	validatingNullability   bool
	nullabilityWarningsFile android.WritablePath
	annotationsZip          android.WritablePath
}
type stubsCommandParams struct {
	srcJarDir               android.ModuleOutPath
	stubsDir                android.OptionalPath
	stubsSrcJar             android.WritablePath
	metadataZip             android.WritablePath
	metadataDir             android.WritablePath
	apiVersionsXml          android.WritablePath
	nullabilityWarningsFile android.WritablePath
	annotationsZip          android.WritablePath
	stubConfig              stubsCommandConfigParams
}
type stubsCommandConfigParams struct {
	stubsType             StubsType
	javaVersion           javaVersion
	deps                  deps
	checkApi              bool
	generateStubs         bool
	doApiLint             bool
	doCheckReleased       bool
	writeSdkValues        bool
	migratingNullability  bool
	validatingNullability bool
}

// droidstubs passes sources files through Metalava to generate stub .java files that only contain the API to be
// documented, filtering out hidden classes and methods.  The resulting .java files are intended to be passed to
// a droiddoc module to generate documentation.
func DroidstubsFactory() android.Module {
	module := &Droidstubs{}

	module.AddProperties(&module.properties,
		&module.Javadoc.properties)
	module.initModuleAndImport(module)

	InitDroiddocModule(module, android.HostAndDeviceSupported)

	module.SetDefaultableHook(func(ctx android.DefaultableHookContext) {
		module.createApiContribution(ctx)
	})
	return module
}

// droidstubs_host passes sources files through Metalava to generate stub .java files that only contain the API
// to be documented, filtering out hidden classes and methods.  The resulting .java files are intended to be
// passed to a droiddoc_host module to generate documentation.  Use a droidstubs_host instead of a droidstubs
// module when symbols needed by the source files are provided by java_library_host modules.
func DroidstubsHostFactory() android.Module {
	module := &Droidstubs{}

	module.AddProperties(&module.properties,
		&module.Javadoc.properties)

	InitDroiddocModule(module, android.HostSupported)
	return module
}

func getStubsTypeAndTag(tag string) (StubsType, string, error) {
	if len(tag) == 0 {
		return Everything, "", nil
	}
	if tag[0] != '.' {
		return Unavailable, "", fmt.Errorf("tag must begin with \".\"")
	}

	stubsType := Everything
	// Check if the tag has a stubs type prefix (e.g. ".exportable")
	for st := Everything; st <= Exportable; st++ {
		if strings.HasPrefix(tag, "."+st.String()) {
			stubsType = st
		}
	}

	return stubsType, strings.TrimPrefix(tag, "."+stubsType.String()), nil
}

// Droidstubs' tag supports specifying with the stubs type.
// While supporting the pre-existing tags, it also supports tags with
// the stubs type prefix. Some examples are shown below:
// {.annotations.zip} - pre-existing behavior. Returns the path to the
// annotation zip.
// {.exportable} - Returns the path to the exportable stubs src jar.
// {.exportable.annotations.zip} - Returns the path to the exportable
// annotations zip file.
// {.runtime.api_versions.xml} - Runtime stubs does not generate api versions
// xml file. For unsupported combinations, the default everything output file
// is returned.
func (d *Droidstubs) OutputFiles(tag string) (android.Paths, error) {
	stubsType, prefixRemovedTag, err := getStubsTypeAndTag(tag)
	if err != nil {
		return nil, err
	}
	switch prefixRemovedTag {
	case "":
		return d.StubsSrcJarWithStubsType(stubsType)
	case ".docs.zip":
		return d.DocZipWithStubsType(stubsType)
	case ".api.txt", android.DefaultDistTag:
		// This is the default dist path for dist properties that have no tag property.
		return d.ApiFilePathWithStubsType(stubsType)
	case ".removed-api.txt":
		return d.RemovedApiFilePathWithStubsType(stubsType)
	case ".annotations.zip":
		return d.AnnotationsZipWithStubsType(stubsType)
	case ".api_versions.xml":
		return d.ApiVersionsXmlFilePathWithStubsType(stubsType)
	default:
		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
	}
}

func (d *Droidstubs) AnnotationsZip() android.Path {
	return d.annotationsZip
}

func (d *Droidstubs) ExportableAnnotationsZip() android.Path {
	return d.exportableAnnotationsZip
}

func (d *Droidstubs) AnnotationsZipWithStubsType(stubsType StubsType) (android.Paths, error) {
	switch stubsType {
	case Everything:
		return android.Paths{d.AnnotationsZip()}, nil
	case Exportable:
		return android.Paths{d.ExportableAnnotationsZip()}, nil
	default:
		return nil, fmt.Errorf("annotations zip not supported for the stub type %s", stubsType.String())
	}
}

func (d *Droidstubs) ApiFilePath() android.Path {
	return d.apiFile
}

func (d *Droidstubs) ExportableApiFilePath() android.Path {
	return d.exportableApiFile
}

func (d *Droidstubs) ApiFilePathWithStubsType(stubsType StubsType) (android.Paths, error) {
	switch stubsType {
	case Everything:
		return android.Paths{d.ApiFilePath()}, nil
	case Exportable:
		return android.Paths{d.ExportableApiFilePath()}, nil
	default:
		return nil, fmt.Errorf("api file path not supported for the stub type %s", stubsType.String())
	}
}

func (d *Droidstubs) ApiVersionsXmlFilePathWithStubsType(stubsType StubsType) (android.Paths, error) {
	switch stubsType {
	case Everything:
		return android.Paths{d.apiVersionsXml}, nil
	default:
		return nil, fmt.Errorf("api versions xml file path not supported for the stub type %s", stubsType.String())
	}
}

func (d *Droidstubs) DocZipWithStubsType(stubsType StubsType) (android.Paths, error) {
	switch stubsType {
	case Everything:
		return android.Paths{d.docZip}, nil
	default:
		return nil, fmt.Errorf("docs zip not supported for the stub type %s", stubsType.String())
	}
}

func (d *Droidstubs) RemovedApiFilePath() android.Path {
	return d.removedApiFile
}

func (d *Droidstubs) ExportableRemovedApiFilePath() android.Path {
	return d.exportableRemovedApiFile
}

func (d *Droidstubs) RemovedApiFilePathWithStubsType(stubsType StubsType) (android.Paths, error) {
	switch stubsType {
	case Everything:
		return android.Paths{d.RemovedApiFilePath()}, nil
	case Exportable:
		return android.Paths{d.ExportableRemovedApiFilePath()}, nil
	default:
		return nil, fmt.Errorf("removed api file path not supported for the stub type %s", stubsType.String())
	}
}

func (d *Droidstubs) StubsSrcJar() android.Path {
	return d.stubsSrcJar
}

func (d *Droidstubs) ExportableStubsSrcJar() android.Path {
	return d.exportableStubsSrcJar
}

func (d *Droidstubs) StubsSrcJarWithStubsType(stubsType StubsType) (android.Paths, error) {
	switch stubsType {
	case Everything:
		return android.Paths{d.StubsSrcJar()}, nil
	case Exportable:
		return android.Paths{d.ExportableStubsSrcJar()}, nil
	default:
		return nil, fmt.Errorf("stubs srcjar not supported for the stub type %s", stubsType.String())
	}
}

func (d *Droidstubs) CurrentApiTimestamp() android.Path {
	return d.checkCurrentApiTimestamp
}

var metalavaMergeAnnotationsDirTag = dependencyTag{name: "metalava-merge-annotations-dir"}
var metalavaMergeInclusionAnnotationsDirTag = dependencyTag{name: "metalava-merge-inclusion-annotations-dir"}
var metalavaAPILevelsAnnotationsDirTag = dependencyTag{name: "metalava-api-levels-annotations-dir"}
var metalavaAPILevelsModuleTag = dependencyTag{name: "metalava-api-levels-module-tag"}
var metalavaCurrentApiTimestampTag = dependencyTag{name: "metalava-current-api-timestamp-tag"}

func (d *Droidstubs) DepsMutator(ctx android.BottomUpMutatorContext) {
	d.Javadoc.addDeps(ctx)

	if len(d.properties.Merge_annotations_dirs) != 0 {
		for _, mergeAnnotationsDir := range d.properties.Merge_annotations_dirs {
			ctx.AddDependency(ctx.Module(), metalavaMergeAnnotationsDirTag, mergeAnnotationsDir)
		}
	}

	if len(d.properties.Merge_inclusion_annotations_dirs) != 0 {
		for _, mergeInclusionAnnotationsDir := range d.properties.Merge_inclusion_annotations_dirs {
			ctx.AddDependency(ctx.Module(), metalavaMergeInclusionAnnotationsDirTag, mergeInclusionAnnotationsDir)
		}
	}

	if len(d.properties.Api_levels_annotations_dirs) != 0 {
		for _, apiLevelsAnnotationsDir := range d.properties.Api_levels_annotations_dirs {
			ctx.AddDependency(ctx.Module(), metalavaAPILevelsAnnotationsDirTag, apiLevelsAnnotationsDir)
		}
	}

	if len(d.properties.Aconfig_declarations) != 0 {
		for _, aconfigDeclarationModuleName := range d.properties.Aconfig_declarations {
			ctx.AddDependency(ctx.Module(), aconfigDeclarationTag, aconfigDeclarationModuleName)
		}
	}

	if d.properties.Api_levels_module != nil {
		ctx.AddDependency(ctx.Module(), metalavaAPILevelsModuleTag, proptools.String(d.properties.Api_levels_module))
	}
}

func (d *Droidstubs) sdkValuesFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, metadataDir android.WritablePath) {
	cmd.FlagWithArg("--sdk-values ", metadataDir.String())
}

func (d *Droidstubs) stubsFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, stubsDir android.OptionalPath, stubsType StubsType, checkApi bool) {
	if checkApi || String(d.properties.Api_filename) != "" {
		filename := proptools.StringDefault(d.properties.Api_filename, ctx.ModuleName()+"_api.txt")
		uncheckedApiFile := android.PathForModuleOut(ctx, stubsType.String(), filename)
		cmd.FlagWithOutput("--api ", uncheckedApiFile)

		if stubsType == Everything {
			d.apiFile = uncheckedApiFile
		} else if stubsType == Exportable {
			d.exportableApiFile = uncheckedApiFile
		}
	} else if sourceApiFile := proptools.String(d.properties.Check_api.Current.Api_file); sourceApiFile != "" {
		// If check api is disabled then make the source file available for export.
		d.apiFile = android.PathForModuleSrc(ctx, sourceApiFile)
	}

	if checkApi || String(d.properties.Removed_api_filename) != "" {
		filename := proptools.StringDefault(d.properties.Removed_api_filename, ctx.ModuleName()+"_removed.txt")
		uncheckedRemovedFile := android.PathForModuleOut(ctx, stubsType.String(), filename)
		cmd.FlagWithOutput("--removed-api ", uncheckedRemovedFile)

		if stubsType == Everything {
			d.removedApiFile = uncheckedRemovedFile
		} else if stubsType == Exportable {
			d.exportableRemovedApiFile = uncheckedRemovedFile
		}
	} else if sourceRemovedApiFile := proptools.String(d.properties.Check_api.Current.Removed_api_file); sourceRemovedApiFile != "" {
		// If check api is disabled then make the source removed api file available for export.
		d.removedApiFile = android.PathForModuleSrc(ctx, sourceRemovedApiFile)
	}

	if stubsDir.Valid() {
		if Bool(d.properties.Create_doc_stubs) {
			cmd.FlagWithArg("--doc-stubs ", stubsDir.String())
		} else {
			cmd.FlagWithArg("--stubs ", stubsDir.String())
			if !Bool(d.properties.Output_javadoc_comments) {
				cmd.Flag("--exclude-documentation-from-stubs")
			}
		}
	}
}

func (d *Droidstubs) annotationsFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, params annotationFlagsParams) {
	if Bool(d.properties.Annotations_enabled) {
		cmd.Flag(config.MetalavaAnnotationsFlags)

		if params.migratingNullability {
			previousApi := android.PathForModuleSrc(ctx, String(d.properties.Previous_api))
			cmd.FlagWithInput("--migrate-nullness ", previousApi)
		}

		if s := String(d.properties.Validate_nullability_from_list); s != "" {
			cmd.FlagWithInput("--validate-nullability-from-list ", android.PathForModuleSrc(ctx, s))
		}

		if params.validatingNullability {
			cmd.FlagWithOutput("--nullability-warnings-txt ", params.nullabilityWarningsFile)
		}

		cmd.FlagWithOutput("--extract-annotations ", params.annotationsZip)

		if len(d.properties.Merge_annotations_dirs) != 0 {
			d.mergeAnnoDirFlags(ctx, cmd)
		}

		cmd.Flag(config.MetalavaAnnotationsWarningsFlags)
	}
}

func (d *Droidstubs) mergeAnnoDirFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand) {
	ctx.VisitDirectDepsWithTag(metalavaMergeAnnotationsDirTag, func(m android.Module) {
		if t, ok := m.(*ExportedDroiddocDir); ok {
			cmd.FlagWithArg("--merge-qualifier-annotations ", t.dir.String()).Implicits(t.deps)
		} else {
			ctx.PropertyErrorf("merge_annotations_dirs",
				"module %q is not a metalava merge-annotations dir", ctx.OtherModuleName(m))
		}
	})
}

func (d *Droidstubs) inclusionAnnotationsFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand) {
	ctx.VisitDirectDepsWithTag(metalavaMergeInclusionAnnotationsDirTag, func(m android.Module) {
		if t, ok := m.(*ExportedDroiddocDir); ok {
			cmd.FlagWithArg("--merge-inclusion-annotations ", t.dir.String()).Implicits(t.deps)
		} else {
			ctx.PropertyErrorf("merge_inclusion_annotations_dirs",
				"module %q is not a metalava merge-annotations dir", ctx.OtherModuleName(m))
		}
	})
}

func (d *Droidstubs) apiLevelsAnnotationsFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, stubsType StubsType, apiVersionsXml android.WritablePath) {
	var apiVersions android.Path
	if proptools.Bool(d.properties.Api_levels_annotations_enabled) {
		d.apiLevelsGenerationFlags(ctx, cmd, stubsType, apiVersionsXml)
		apiVersions = d.apiVersionsXml
	} else {
		ctx.VisitDirectDepsWithTag(metalavaAPILevelsModuleTag, func(m android.Module) {
			if s, ok := m.(*Droidstubs); ok {
				apiVersions = s.apiVersionsXml
			} else {
				ctx.PropertyErrorf("api_levels_module",
					"module %q is not a droidstubs module", ctx.OtherModuleName(m))
			}
		})
	}
	if apiVersions != nil {
		cmd.FlagWithArg("--current-version ", ctx.Config().PlatformSdkVersion().String())
		cmd.FlagWithArg("--current-codename ", ctx.Config().PlatformSdkCodename())
		cmd.FlagWithInput("--apply-api-levels ", apiVersions)
	}
}

func (d *Droidstubs) apiLevelsGenerationFlags(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, stubsType StubsType, apiVersionsXml android.WritablePath) {
	if len(d.properties.Api_levels_annotations_dirs) == 0 {
		ctx.PropertyErrorf("api_levels_annotations_dirs",
			"has to be non-empty if api levels annotations was enabled!")
	}

	cmd.FlagWithOutput("--generate-api-levels ", apiVersionsXml)

	filename := proptools.StringDefault(d.properties.Api_levels_jar_filename, "android.jar")

	var dirs []string
	var extensions_dir string
	ctx.VisitDirectDepsWithTag(metalavaAPILevelsAnnotationsDirTag, func(m android.Module) {
		if t, ok := m.(*ExportedDroiddocDir); ok {
			extRegex := regexp.MustCompile(t.dir.String() + `/extensions/[0-9]+/public/.*\.jar`)

			// Grab the first extensions_dir and we find while scanning ExportedDroiddocDir.deps;
			// ideally this should be read from prebuiltApis.properties.Extensions_*
			for _, dep := range t.deps {
				if extRegex.MatchString(dep.String()) && d.properties.Extensions_info_file != nil {
					if extensions_dir == "" {
						extensions_dir = t.dir.String() + "/extensions"
					}
					cmd.Implicit(dep)
				}
				if dep.Base() == filename {
					cmd.Implicit(dep)
				}
				if filename != "android.jar" && dep.Base() == "android.jar" {
					// Metalava implicitly searches these patterns:
					//  prebuilts/tools/common/api-versions/android-%/android.jar
					//  prebuilts/sdk/%/public/android.jar
					// Add android.jar files from the api_levels_annotations_dirs directories to try
					// to satisfy these patterns.  If Metalava can't find a match for an API level
					// between 1 and 28 in at least one pattern it will fail.
					cmd.Implicit(dep)
				}
			}

			dirs = append(dirs, t.dir.String())
		} else {
			ctx.PropertyErrorf("api_levels_annotations_dirs",
				"module %q is not a metalava api-levels-annotations dir", ctx.OtherModuleName(m))
		}
	})

	// Add all relevant --android-jar-pattern patterns for Metalava.
	// When parsing a stub jar for a specific version, Metalava picks the first pattern that defines
	// an actual file present on disk (in the order the patterns were passed). For system APIs for
	// privileged apps that are only defined since API level 21 (Lollipop), fallback to public stubs
	// for older releases. Similarly, module-lib falls back to system API.
	var sdkDirs []string
	switch proptools.StringDefault(d.properties.Api_levels_sdk_type, "public") {
	case "system-server":
		sdkDirs = []string{"system-server", "module-lib", "system", "public"}
	case "module-lib":
		sdkDirs = []string{"module-lib", "system", "public"}
	case "system":
		sdkDirs = []string{"system", "public"}
	case "public":
		sdkDirs = []string{"public"}
	default:
		ctx.PropertyErrorf("api_levels_sdk_type", "needs to be one of %v", allowedApiLevelSdkTypes)
		return
	}

	for _, sdkDir := range sdkDirs {
		for _, dir := range dirs {
			cmd.FlagWithArg("--android-jar-pattern ", fmt.Sprintf("%s/%%/%s/%s", dir, sdkDir, filename))
		}
	}

	if d.properties.Extensions_info_file != nil {
		if extensions_dir == "" {
			ctx.ModuleErrorf("extensions_info_file set, but no SDK extension dirs found")
		}
		info_file := android.PathForModuleSrc(ctx, *d.properties.Extensions_info_file)
		cmd.Implicit(info_file)
		cmd.FlagWithArg("--sdk-extensions-root ", extensions_dir)
		cmd.FlagWithArg("--sdk-extensions-info ", info_file.String())
	}
}

func metalavaUseRbe(ctx android.ModuleContext) bool {
	return ctx.Config().UseRBE() && ctx.Config().IsEnvTrue("RBE_METALAVA")
}

func metalavaCmd(ctx android.ModuleContext, rule *android.RuleBuilder, javaVersion javaVersion, srcs android.Paths,
	srcJarList android.Path, bootclasspath, classpath classpath, homeDir android.WritablePath) *android.RuleBuilderCommand {
	rule.Command().Text("rm -rf").Flag(homeDir.String())
	rule.Command().Text("mkdir -p").Flag(homeDir.String())

	cmd := rule.Command()
	cmd.FlagWithArg("ANDROID_PREFS_ROOT=", homeDir.String())

	if metalavaUseRbe(ctx) {
		rule.Remoteable(android.RemoteRuleSupports{RBE: true})
		execStrategy := ctx.Config().GetenvWithDefault("RBE_METALAVA_EXEC_STRATEGY", remoteexec.LocalExecStrategy)
		compare := ctx.Config().IsEnvTrue("RBE_METALAVA_COMPARE")
		remoteUpdateCache := !ctx.Config().IsEnvFalse("RBE_METALAVA_REMOTE_UPDATE_CACHE")
		labels := map[string]string{"type": "tool", "name": "metalava"}
		// TODO: metalava pool rejects these jobs
		pool := ctx.Config().GetenvWithDefault("RBE_METALAVA_POOL", "java16")
		rule.Rewrapper(&remoteexec.REParams{
			Labels:              labels,
			ExecStrategy:        execStrategy,
			ToolchainInputs:     []string{config.JavaCmd(ctx).String()},
			Platform:            map[string]string{remoteexec.PoolKey: pool},
			Compare:             compare,
			NumLocalRuns:        1,
			NumRemoteRuns:       1,
			NoRemoteUpdateCache: !remoteUpdateCache,
		})
	}

	cmd.BuiltTool("metalava").ImplicitTool(ctx.Config().HostJavaToolPath(ctx, "metalava.jar")).
		Flag(config.JavacVmFlags).
		Flag(config.MetalavaAddOpens).
		FlagWithArg("--java-source ", javaVersion.String()).
		FlagWithRspFileInputList("@", android.PathForModuleOut(ctx, "metalava.rsp"), srcs).
		FlagWithInput("@", srcJarList)

	// Metalava does not differentiate between bootclasspath and classpath and has not done so for
	// years, so it is unlikely to change any time soon.
	combinedPaths := append(([]android.Path)(nil), bootclasspath.Paths()...)
	combinedPaths = append(combinedPaths, classpath.Paths()...)
	if len(combinedPaths) > 0 {
		cmd.FlagWithInputList("--classpath ", combinedPaths, ":")
	}

	cmd.Flag(config.MetalavaFlags)
	if ctx.DeviceConfig().HideFlaggedApis() {
		cmd.Flag(config.MetalavaHideFlaggedApis)
	}

	return cmd
}

// Pass flagged apis related flags to metalava. When aconfig_declarations property is not
// defined for a module, simply revert all flagged apis annotations. If aconfig_declarations
// property is defined, apply transformations and only revert the flagged apis that are not
// enabled via release configurations and are not specified in aconfig_declarations
func (d *Droidstubs) generateRevertAnnotationArgs(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, stubsType StubsType, aconfigFlagsPaths android.Paths) {

	if len(aconfigFlagsPaths) == 0 {
		cmd.Flag("--revert-annotation android.annotation.FlaggedApi")
		return
	}

	releasedFlaggedApisFile := android.PathForModuleOut(ctx, fmt.Sprintf("released-flagged-apis-%s.txt", stubsType.String()))
	revertAnnotationsFile := android.PathForModuleOut(ctx, fmt.Sprintf("revert-annotations-%s.txt", stubsType.String()))

	var filterArgs string
	switch stubsType {
	// No flagged apis specific flags need to be passed to metalava when generating
	// everything stubs
	case Everything:
		return

	case Runtime:
		filterArgs = "--filter='state:ENABLED+permission:READ_ONLY' --filter='permission:READ_WRITE'"

	case Exportable:
		filterArgs = "--filter='state:ENABLED+permission:READ_ONLY'"

	}

	ctx.Build(pctx, android.BuildParams{
		Rule:        gatherReleasedFlaggedApisRule,
		Inputs:      aconfigFlagsPaths,
		Output:      releasedFlaggedApisFile,
		Description: fmt.Sprintf("%s gather aconfig flags", stubsType),
		Args: map[string]string{
			"flags_path":  android.JoinPathsWithPrefix(aconfigFlagsPaths, "--cache "),
			"filter_args": filterArgs,
		},
	})

	ctx.Build(pctx, android.BuildParams{
		Rule:        generateMetalavaRevertAnnotationsRule,
		Input:       releasedFlaggedApisFile,
		Output:      revertAnnotationsFile,
		Description: fmt.Sprintf("%s revert annotations", stubsType),
	})

	cmd.FlagWithInput("@", revertAnnotationsFile)
}

func (d *Droidstubs) commonMetalavaStubCmd(ctx android.ModuleContext, rule *android.RuleBuilder,
	params stubsCommandParams) *android.RuleBuilderCommand {
	if BoolDefault(d.properties.High_mem, false) {
		// This metalava run uses lots of memory, restrict the number of metalava jobs that can run in parallel.
		rule.HighMem()
	}

	if params.stubConfig.generateStubs {
		rule.Command().Text("rm -rf").Text(params.stubsDir.String())
		rule.Command().Text("mkdir -p").Text(params.stubsDir.String())
	}

	srcJarList := zipSyncCmd(ctx, rule, params.srcJarDir, d.Javadoc.srcJars)

	homeDir := android.PathForModuleOut(ctx, params.stubConfig.stubsType.String(), "home")
	cmd := metalavaCmd(ctx, rule, params.stubConfig.javaVersion, d.Javadoc.srcFiles, srcJarList,
		params.stubConfig.deps.bootClasspath, params.stubConfig.deps.classpath, homeDir)
	cmd.Implicits(d.Javadoc.implicits)

	d.stubsFlags(ctx, cmd, params.stubsDir, params.stubConfig.stubsType, params.stubConfig.checkApi)

	if params.stubConfig.writeSdkValues {
		d.sdkValuesFlags(ctx, cmd, params.metadataDir)
	}

	annotationParams := annotationFlagsParams{
		migratingNullability:    params.stubConfig.migratingNullability,
		validatingNullability:   params.stubConfig.validatingNullability,
		nullabilityWarningsFile: params.nullabilityWarningsFile,
		annotationsZip:          params.annotationsZip,
	}

	d.annotationsFlags(ctx, cmd, annotationParams)
	d.inclusionAnnotationsFlags(ctx, cmd)
	d.apiLevelsAnnotationsFlags(ctx, cmd, params.stubConfig.stubsType, params.apiVersionsXml)

	d.expandArgs(ctx, cmd)

	for _, o := range d.Javadoc.properties.Out {
		cmd.ImplicitOutput(android.PathForModuleGen(ctx, o))
	}

	return cmd
}

// Sandbox rule for generating the everything stubs and other artifacts
func (d *Droidstubs) everythingStubCmd(ctx android.ModuleContext, params stubsCommandConfigParams) {
	srcJarDir := android.PathForModuleOut(ctx, Everything.String(), "srcjars")
	rule := android.NewRuleBuilder(pctx, ctx)
	rule.Sbox(android.PathForModuleOut(ctx, Everything.String()),
		android.PathForModuleOut(ctx, "metalava.sbox.textproto")).
		SandboxInputs()

	var stubsDir android.OptionalPath
	if params.generateStubs {
		stubsDir = android.OptionalPathForPath(android.PathForModuleOut(ctx, Everything.String(), "stubsDir"))
		d.Javadoc.stubsSrcJar = android.PathForModuleOut(ctx, Everything.String(), ctx.ModuleName()+"-"+"stubs.srcjar")
	}

	if params.writeSdkValues {
		d.metadataDir = android.PathForModuleOut(ctx, Everything.String(), "metadata")
		d.metadataZip = android.PathForModuleOut(ctx, Everything.String(), ctx.ModuleName()+"-metadata.zip")
	}

	if Bool(d.properties.Annotations_enabled) {
		if params.validatingNullability {
			d.nullabilityWarningsFile = android.PathForModuleOut(ctx, Everything.String(), ctx.ModuleName()+"_nullability_warnings.txt")
		}
		d.annotationsZip = android.PathForModuleOut(ctx, Everything.String(), ctx.ModuleName()+"_annotations.zip")
	}
	if Bool(d.properties.Api_levels_annotations_enabled) {
		d.apiVersionsXml = android.PathForModuleOut(ctx, Everything.String(), "api-versions.xml")
	}

	commonCmdParams := stubsCommandParams{
		srcJarDir:               srcJarDir,
		stubsDir:                stubsDir,
		stubsSrcJar:             d.Javadoc.stubsSrcJar,
		metadataDir:             d.metadataDir,
		apiVersionsXml:          d.apiVersionsXml,
		nullabilityWarningsFile: d.nullabilityWarningsFile,
		annotationsZip:          d.annotationsZip,
		stubConfig:              params,
	}

	cmd := d.commonMetalavaStubCmd(ctx, rule, commonCmdParams)

	d.everythingOptionalCmd(ctx, cmd, params.doApiLint, params.doCheckReleased)

	if params.generateStubs {
		rule.Command().
			BuiltTool("soong_zip").
			Flag("-write_if_changed").
			Flag("-jar").
			FlagWithOutput("-o ", d.Javadoc.stubsSrcJar).
			FlagWithArg("-C ", stubsDir.String()).
			FlagWithArg("-D ", stubsDir.String())
	}

	if params.writeSdkValues {
		rule.Command().
			BuiltTool("soong_zip").
			Flag("-write_if_changed").
			Flag("-d").
			FlagWithOutput("-o ", d.metadataZip).
			FlagWithArg("-C ", d.metadataDir.String()).
			FlagWithArg("-D ", d.metadataDir.String())
	}

	// TODO: We don't really need two separate API files, but this is a reminiscence of how
	// we used to run metalava separately for API lint and the "last_released" check. Unify them.
	if params.doApiLint {
		rule.Command().Text("touch").Output(d.apiLintTimestamp)
	}
	if params.doCheckReleased {
		rule.Command().Text("touch").Output(d.checkLastReleasedApiTimestamp)
	}

	// TODO(b/183630617): rewrapper doesn't support restat rules
	if !metalavaUseRbe(ctx) {
		rule.Restat()
	}

	zipSyncCleanupCmd(rule, srcJarDir)

	rule.Build("metalava", "metalava merged")
}

// Sandbox rule for generating the everything artifacts that are not run by
// default but only run based on the module configurations
func (d *Droidstubs) everythingOptionalCmd(ctx android.ModuleContext, cmd *android.RuleBuilderCommand, doApiLint bool, doCheckReleased bool) {

	// Add API lint options.
	if doApiLint {
		newSince := android.OptionalPathForModuleSrc(ctx, d.properties.Check_api.Api_lint.New_since)
		if newSince.Valid() {
			cmd.FlagWithInput("--api-lint ", newSince.Path())
		} else {
			cmd.Flag("--api-lint")
		}
		d.apiLintReport = android.PathForModuleOut(ctx, Everything.String(), "api_lint_report.txt")
		cmd.FlagWithOutput("--report-even-if-suppressed ", d.apiLintReport) // TODO:  Change to ":api-lint"

		// TODO(b/154317059): Clean up this allowlist by baselining and/or checking in last-released.
		if d.Name() != "android.car-system-stubs-docs" &&
			d.Name() != "android.car-stubs-docs" {
			cmd.Flag("--lints-as-errors")
			cmd.Flag("--warnings-as-errors") // Most lints are actually warnings.
		}

		baselineFile := android.OptionalPathForModuleSrc(ctx, d.properties.Check_api.Api_lint.Baseline_file)
		updatedBaselineOutput := android.PathForModuleOut(ctx, Everything.String(), "api_lint_baseline.txt")
		d.apiLintTimestamp = android.PathForModuleOut(ctx, Everything.String(), "api_lint.timestamp")

		// Note this string includes a special shell quote $' ... ', which decodes the "\n"s.
		//
		// TODO: metalava also has a slightly different message hardcoded. Should we unify this
		// message and metalava's one?
		msg := `$'` + // Enclose with $' ... '
			`************************************************************\n` +
			`Your API changes are triggering API Lint warnings or errors.\n` +
			`To make these errors go away, fix the code according to the\n` +
			`error and/or warning messages above.\n` +
			`\n` +
			`If it is not possible to do so, there are workarounds:\n` +
			`\n` +
			`1. You can suppress the errors with @SuppressLint("<id>")\n` +
			`   where the <id> is given in brackets in the error message above.\n`

		if baselineFile.Valid() {
			cmd.FlagWithInput("--baseline:api-lint ", baselineFile.Path())
			cmd.FlagWithOutput("--update-baseline:api-lint ", updatedBaselineOutput)

			msg += fmt.Sprintf(``+
				`2. You can update the baseline by executing the following\n`+
				`   command:\n`+
				`       (cd $ANDROID_BUILD_TOP && cp \\\n`+
				`       "%s" \\\n`+
				`       "%s")\n`+
				`   To submit the revised baseline.txt to the main Android\n`+
				`   repository, you will need approval.\n`, updatedBaselineOutput, baselineFile.Path())
		} else {
			msg += fmt.Sprintf(``+
				`2. You can add a baseline file of existing lint failures\n`+
				`   to the build rule of %s.\n`, d.Name())
		}
		// Note the message ends with a ' (single quote), to close the $' ... ' .
		msg += `************************************************************\n'`

		cmd.FlagWithArg("--error-message:api-lint ", msg)
	}

	// Add "check released" options. (Detect incompatible API changes from the last public release)
	if doCheckReleased {
		if len(d.Javadoc.properties.Out) > 0 {
			ctx.PropertyErrorf("out", "out property may not be combined with check_api")
		}

		apiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Last_released.Api_file))
		removedApiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Last_released.Removed_api_file))
		baselineFile := android.OptionalPathForModuleSrc(ctx, d.properties.Check_api.Last_released.Baseline_file)
		updatedBaselineOutput := android.PathForModuleOut(ctx, Everything.String(), "last_released_baseline.txt")

		d.checkLastReleasedApiTimestamp = android.PathForModuleOut(ctx, Everything.String(), "check_last_released_api.timestamp")

		cmd.FlagWithInput("--check-compatibility:api:released ", apiFile)
		cmd.FlagWithInput("--check-compatibility:removed:released ", removedApiFile)

		if baselineFile.Valid() {
			cmd.FlagWithInput("--baseline:compatibility:released ", baselineFile.Path())
			cmd.FlagWithOutput("--update-baseline:compatibility:released ", updatedBaselineOutput)
		}

		// Note this string includes quote ($' ... '), which decodes the "\n"s.
		msg := `$'\n******************************\n` +
			`You have tried to change the API from what has been previously released in\n` +
			`an SDK.  Please fix the errors listed above.\n` +
			`******************************\n'`

		cmd.FlagWithArg("--error-message:compatibility:released ", msg)
	}

	if apiCheckEnabled(ctx, d.properties.Check_api.Current, "current") {
		// Pass the current API file into metalava so it can use it as the basis for determining how to
		// generate the output signature files (both api and removed).
		currentApiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Current.Api_file))
		cmd.FlagWithInput("--use-same-format-as ", currentApiFile)
	}
}

// Sandbox rule for generating exportable stubs and other artifacts
func (d *Droidstubs) exportableStubCmd(ctx android.ModuleContext, params stubsCommandConfigParams) {
	optionalCmdParams := stubsCommandParams{
		stubConfig: params,
	}

	d.Javadoc.exportableStubsSrcJar = android.PathForModuleOut(ctx, params.stubsType.String(), ctx.ModuleName()+"-"+"stubs.srcjar")
	optionalCmdParams.stubsSrcJar = d.Javadoc.exportableStubsSrcJar
	if params.writeSdkValues {
		d.exportableMetadataZip = android.PathForModuleOut(ctx, params.stubsType.String(), ctx.ModuleName()+"-metadata.zip")
		d.exportableMetadataDir = android.PathForModuleOut(ctx, params.stubsType.String(), "metadata")
		optionalCmdParams.metadataZip = d.exportableMetadataZip
		optionalCmdParams.metadataDir = d.exportableMetadataDir
	}

	if Bool(d.properties.Annotations_enabled) {
		if params.validatingNullability {
			d.exportableNullabilityWarningsFile = android.PathForModuleOut(ctx, params.stubsType.String(), ctx.ModuleName()+"_nullability_warnings.txt")
			optionalCmdParams.nullabilityWarningsFile = d.exportableNullabilityWarningsFile
		}
		d.exportableAnnotationsZip = android.PathForModuleOut(ctx, params.stubsType.String(), ctx.ModuleName()+"_annotations.zip")
		optionalCmdParams.annotationsZip = d.exportableAnnotationsZip
	}
	if Bool(d.properties.Api_levels_annotations_enabled) {
		d.exportableApiVersionsXml = android.PathForModuleOut(ctx, params.stubsType.String(), "api-versions.xml")
		optionalCmdParams.apiVersionsXml = d.exportableApiVersionsXml
	}

	if params.checkApi || String(d.properties.Api_filename) != "" {
		filename := proptools.StringDefault(d.properties.Api_filename, ctx.ModuleName()+"_api.txt")
		d.exportableApiFile = android.PathForModuleOut(ctx, params.stubsType.String(), filename)
	}

	if params.checkApi || String(d.properties.Removed_api_filename) != "" {
		filename := proptools.StringDefault(d.properties.Removed_api_filename, ctx.ModuleName()+"_api.txt")
		d.exportableRemovedApiFile = android.PathForModuleOut(ctx, params.stubsType.String(), filename)
	}

	d.optionalStubCmd(ctx, optionalCmdParams)
}

func (d *Droidstubs) optionalStubCmd(ctx android.ModuleContext, params stubsCommandParams) {

	params.srcJarDir = android.PathForModuleOut(ctx, params.stubConfig.stubsType.String(), "srcjars")
	rule := android.NewRuleBuilder(pctx, ctx)
	rule.Sbox(android.PathForModuleOut(ctx, params.stubConfig.stubsType.String()),
		android.PathForModuleOut(ctx, fmt.Sprintf("metalava_%s.sbox.textproto", params.stubConfig.stubsType.String()))).
		SandboxInputs()

	if params.stubConfig.generateStubs {
		params.stubsDir = android.OptionalPathForPath(android.PathForModuleOut(ctx, params.stubConfig.stubsType.String(), "stubsDir"))
	}

	cmd := d.commonMetalavaStubCmd(ctx, rule, params)

	d.generateRevertAnnotationArgs(ctx, cmd, params.stubConfig.stubsType, params.stubConfig.deps.aconfigProtoFiles)

	if params.stubConfig.doApiLint {
		// Pass the lint baseline file as an input to resolve the lint errors.
		// The exportable stubs generation does not update the lint baseline file.
		// Lint baseline file update is handled by the everything stubs
		baselineFile := android.OptionalPathForModuleSrc(ctx, d.properties.Check_api.Api_lint.Baseline_file)
		if baselineFile.Valid() {
			cmd.FlagWithInput("--baseline:api-lint ", baselineFile.Path())
		}
	}

	if params.stubConfig.generateStubs {
		rule.Command().
			BuiltTool("soong_zip").
			Flag("-write_if_changed").
			Flag("-jar").
			FlagWithOutput("-o ", params.stubsSrcJar).
			FlagWithArg("-C ", params.stubsDir.String()).
			FlagWithArg("-D ", params.stubsDir.String())
	}

	if params.stubConfig.writeSdkValues {
		rule.Command().
			BuiltTool("soong_zip").
			Flag("-write_if_changed").
			Flag("-d").
			FlagWithOutput("-o ", params.metadataZip).
			FlagWithArg("-C ", params.metadataDir.String()).
			FlagWithArg("-D ", params.metadataDir.String())
	}

	// TODO(b/183630617): rewrapper doesn't support restat rules
	if !metalavaUseRbe(ctx) {
		rule.Restat()
	}

	zipSyncCleanupCmd(rule, params.srcJarDir)

	rule.Build(fmt.Sprintf("metalava_%s", params.stubConfig.stubsType.String()), "metalava merged")
}

func (d *Droidstubs) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	deps := d.Javadoc.collectDeps(ctx)

	javaVersion := getJavaVersion(ctx, String(d.Javadoc.properties.Java_version), android.SdkContext(d))
	generateStubs := BoolDefault(d.properties.Generate_stubs, true)

	// Add options for the other optional tasks: API-lint and check-released.
	// We generate separate timestamp files for them.
	doApiLint := BoolDefault(d.properties.Check_api.Api_lint.Enabled, false)
	doCheckReleased := apiCheckEnabled(ctx, d.properties.Check_api.Last_released, "last_released")

	writeSdkValues := Bool(d.properties.Write_sdk_values)

	annotationsEnabled := Bool(d.properties.Annotations_enabled)

	migratingNullability := annotationsEnabled && String(d.properties.Previous_api) != ""
	validatingNullability := annotationsEnabled && (strings.Contains(String(d.Javadoc.properties.Args), "--validate-nullability-from-merged-stubs") ||
		String(d.properties.Validate_nullability_from_list) != "")

	checkApi := apiCheckEnabled(ctx, d.properties.Check_api.Current, "current") ||
		apiCheckEnabled(ctx, d.properties.Check_api.Last_released, "last_released")

	stubCmdParams := stubsCommandConfigParams{
		javaVersion:           javaVersion,
		deps:                  deps,
		checkApi:              checkApi,
		generateStubs:         generateStubs,
		doApiLint:             doApiLint,
		doCheckReleased:       doCheckReleased,
		writeSdkValues:        writeSdkValues,
		migratingNullability:  migratingNullability,
		validatingNullability: validatingNullability,
	}
	stubCmdParams.stubsType = Everything
	// Create default (i.e. "everything" stubs) rule for metalava
	d.everythingStubCmd(ctx, stubCmdParams)

	// The module generates "exportable" (and "runtime" eventually) stubs regardless of whether
	// aconfig_declarations property is defined or not. If the property is not defined, the module simply
	// strips all flagged apis to generate the "exportable" stubs
	stubCmdParams.stubsType = Exportable
	d.exportableStubCmd(ctx, stubCmdParams)

	if apiCheckEnabled(ctx, d.properties.Check_api.Current, "current") {

		if len(d.Javadoc.properties.Out) > 0 {
			ctx.PropertyErrorf("out", "out property may not be combined with check_api")
		}

		apiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Current.Api_file))
		removedApiFile := android.PathForModuleSrc(ctx, String(d.properties.Check_api.Current.Removed_api_file))
		baselineFile := android.OptionalPathForModuleSrc(ctx, d.properties.Check_api.Current.Baseline_file)

		if baselineFile.Valid() {
			ctx.PropertyErrorf("baseline_file", "current API check can't have a baseline file. (module %s)", ctx.ModuleName())
		}

		d.checkCurrentApiTimestamp = android.PathForModuleOut(ctx, Everything.String(), "check_current_api.timestamp")

		rule := android.NewRuleBuilder(pctx, ctx)

		// Diff command line.
		// -F matches the closest "opening" line, such as "package android {"
		// and "  public class Intent {".
		diff := `diff -u -F '{ *$'`

		rule.Command().Text("( true")
		rule.Command().
			Text(diff).
			Input(apiFile).Input(d.apiFile)

		rule.Command().
			Text(diff).
			Input(removedApiFile).Input(d.removedApiFile)

		msg := fmt.Sprintf(`\n******************************\n`+
			`You have tried to change the API from what has been previously approved.\n\n`+
			`To make these errors go away, you have two choices:\n`+
			`   1. You can add '@hide' javadoc comments (and remove @SystemApi/@TestApi/etc)\n`+
			`      to the new methods, etc. shown in the above diff.\n\n`+
			`   2. You can update current.txt and/or removed.txt by executing the following command:\n`+
			`         m %s-update-current-api\n\n`+
			`      To submit the revised current.txt to the main Android repository,\n`+
			`      you will need approval.\n`+
			`If your build failed due to stub validation, you can resolve the errors with\n`+
			`either of the two choices above and try re-building the target.\n`+
			`If the mismatch between the stubs and the current.txt is intended,\n`+
			`you can try re-building the target by executing the following command:\n`+
			`m DISABLE_STUB_VALIDATION=true <your build target>\n`+
			`******************************\n`, ctx.ModuleName())

		rule.Command().
			Text("touch").Output(d.checkCurrentApiTimestamp).
			Text(") || (").
			Text("echo").Flag("-e").Flag(`"` + msg + `"`).
			Text("; exit 38").
			Text(")")

		rule.Build("metalavaCurrentApiCheck", "check current API")

		d.updateCurrentApiTimestamp = android.PathForModuleOut(ctx, Everything.String(), "update_current_api.timestamp")

		// update API rule
		rule = android.NewRuleBuilder(pctx, ctx)

		rule.Command().Text("( true")

		rule.Command().
			Text("cp").Flag("-f").
			Input(d.apiFile).Flag(apiFile.String())

		rule.Command().
			Text("cp").Flag("-f").
			Input(d.removedApiFile).Flag(removedApiFile.String())

		msg = "failed to update public API"

		rule.Command().
			Text("touch").Output(d.updateCurrentApiTimestamp).
			Text(") || (").
			Text("echo").Flag("-e").Flag(`"` + msg + `"`).
			Text("; exit 38").
			Text(")")

		rule.Build("metalavaCurrentApiUpdate", "update current API")
	}

	if String(d.properties.Check_nullability_warnings) != "" {
		if d.nullabilityWarningsFile == nil {
			ctx.PropertyErrorf("check_nullability_warnings",
				"Cannot specify check_nullability_warnings unless validating nullability")
		}

		checkNullabilityWarnings := android.PathForModuleSrc(ctx, String(d.properties.Check_nullability_warnings))

		d.checkNullabilityWarningsTimestamp = android.PathForModuleOut(ctx, Everything.String(), "check_nullability_warnings.timestamp")

		msg := fmt.Sprintf(`\n******************************\n`+
			`The warnings encountered during nullability annotation validation did\n`+
			`not match the checked in file of expected warnings. The diffs are shown\n`+
			`above. You have two options:\n`+
			`   1. Resolve the differences by editing the nullability annotations.\n`+
			`   2. Update the file of expected warnings by running:\n`+
			`         cp %s %s\n`+
			`       and submitting the updated file as part of your change.`,
			d.nullabilityWarningsFile, checkNullabilityWarnings)

		rule := android.NewRuleBuilder(pctx, ctx)

		rule.Command().
			Text("(").
			Text("diff").Input(checkNullabilityWarnings).Input(d.nullabilityWarningsFile).
			Text("&&").
			Text("touch").Output(d.checkNullabilityWarningsTimestamp).
			Text(") || (").
			Text("echo").Flag("-e").Flag(`"` + msg + `"`).
			Text("; exit 38").
			Text(")")

		rule.Build("nullabilityWarningsCheck", "nullability warnings check")
	}
}

func (d *Droidstubs) createApiContribution(ctx android.DefaultableHookContext) {
	api_file := d.properties.Check_api.Current.Api_file
	api_surface := d.properties.Api_surface

	props := struct {
		Name        *string
		Api_surface *string
		Api_file    *string
		Visibility  []string
	}{}

	props.Name = proptools.StringPtr(d.Name() + ".api.contribution")
	props.Api_surface = api_surface
	props.Api_file = api_file
	props.Visibility = []string{"//visibility:override", "//visibility:public"}

	ctx.CreateModule(ApiContributionFactory, &props)
}

// TODO (b/262014796): Export the API contributions of CorePlatformApi
// A map to populate the api surface of a droidstub from a substring appearing in its name
// This map assumes that droidstubs (either checked-in or created by java_sdk_library)
// use a strict naming convention
var (
	droidstubsModuleNamingToSdkKind = map[string]android.SdkKind{
		//public is commented out since the core libraries use public in their java_sdk_library names
		"intracore":     android.SdkIntraCore,
		"intra.core":    android.SdkIntraCore,
		"system_server": android.SdkSystemServer,
		"system-server": android.SdkSystemServer,
		"system":        android.SdkSystem,
		"module_lib":    android.SdkModule,
		"module-lib":    android.SdkModule,
		"platform.api":  android.SdkCorePlatform,
		"test":          android.SdkTest,
		"toolchain":     android.SdkToolchain,
	}
)

func StubsDefaultsFactory() android.Module {
	module := &DocDefaults{}

	module.AddProperties(
		&JavadocProperties{},
		&DroidstubsProperties{},
	)

	android.InitDefaultsModule(module)

	return module
}

var _ android.PrebuiltInterface = (*PrebuiltStubsSources)(nil)

type PrebuiltStubsSourcesProperties struct {
	Srcs []string `android:"path"`
}

type PrebuiltStubsSources struct {
	android.ModuleBase
	android.DefaultableModuleBase
	embeddableInModuleAndImport

	prebuilt android.Prebuilt

	properties PrebuiltStubsSourcesProperties

	stubsSrcJar android.Path
}

func (p *PrebuiltStubsSources) OutputFiles(tag string) (android.Paths, error) {
	switch tag {
	// prebuilt droidstubs does not output "exportable" stubs.
	// Output the "everything" stubs srcjar file if the tag is ".exportable".
	case "", ".exportable":
		return android.Paths{p.stubsSrcJar}, nil
	default:
		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
	}
}

func (d *PrebuiltStubsSources) StubsSrcJar() android.Path {
	return d.stubsSrcJar
}

func (p *PrebuiltStubsSources) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	if len(p.properties.Srcs) != 1 {
		ctx.PropertyErrorf("srcs", "must only specify one directory path or srcjar, contains %d paths", len(p.properties.Srcs))
		return
	}

	src := p.properties.Srcs[0]
	if filepath.Ext(src) == ".srcjar" {
		// This is a srcjar. We can use it directly.
		p.stubsSrcJar = android.PathForModuleSrc(ctx, src)
	} else {
		outPath := android.PathForModuleOut(ctx, ctx.ModuleName()+"-"+"stubs.srcjar")

		// This is a directory. Glob the contents just in case the directory does not exist.
		srcGlob := src + "/**/*"
		srcPaths := android.PathsForModuleSrc(ctx, []string{srcGlob})

		// Although PathForModuleSrc can return nil if either the path doesn't exist or
		// the path components are invalid it won't in this case because no components
		// are specified and the module directory must exist in order to get this far.
		srcDir := android.PathForModuleSrc(ctx).(android.SourcePath).Join(ctx, src)

		rule := android.NewRuleBuilder(pctx, ctx)
		rule.Command().
			BuiltTool("soong_zip").
			Flag("-write_if_changed").
			Flag("-jar").
			FlagWithOutput("-o ", outPath).
			FlagWithArg("-C ", srcDir.String()).
			FlagWithRspFileInputList("-r ", outPath.ReplaceExtension(ctx, "rsp"), srcPaths)
		rule.Restat()
		rule.Build("zip src", "Create srcjar from prebuilt source")
		p.stubsSrcJar = outPath
	}
}

func (p *PrebuiltStubsSources) Prebuilt() *android.Prebuilt {
	return &p.prebuilt
}

func (p *PrebuiltStubsSources) Name() string {
	return p.prebuilt.Name(p.ModuleBase.Name())
}

// prebuilt_stubs_sources imports a set of java source files as if they were
// generated by droidstubs.
//
// By default, a prebuilt_stubs_sources has a single variant that expects a
// set of `.java` files generated by droidstubs.
//
// Specifying `host_supported: true` will produce two variants, one for use as a dependency of device modules and one
// for host modules.
//
// Intended only for use by sdk snapshots.
func PrebuiltStubsSourcesFactory() android.Module {
	module := &PrebuiltStubsSources{}

	module.AddProperties(&module.properties)
	module.initModuleAndImport(module)

	android.InitPrebuiltModule(module, &module.properties.Srcs)
	InitDroiddocModule(module, android.HostAndDeviceSupported)
	return module
}