java_sdk_library: Allow api dir to be specified

For modules that provide API surfaces in addition to the standard
current, test and system it is useful to be able to specify the
directory containing the api's .txt files to make it easy to create
multiple API surfaces from within the same Android.bp file. e.g. This
is useful for conscrypt, icu and libcore to manage their intra core
and core platform APIs.

Bug: 145998881
Test: m checkbuild
Change-Id: I753631d9b6993fbf30019fef5c052a9429e519de

2 files changed, 15 insertions, 5 deletions

diff --git a/java/sdk_library.go b/java/sdk_library.go
index 3fc18036f..c68a3d1c3 100644
--- a/java/sdk_library.go
+++ b/java/sdk_library.go
@@ -106,6 +106,10 @@ type sdkLibraryProperties struct {
 	// list of package names that must be hidden from the API
 	Hidden_api_packages []string
 
+	// the relative path to the directory containing the api specification files.
+	// Defaults to "api".
+	Api_dir *string
+
 	// local files that are used within user customized droiddoc options.
 	Droiddoc_option_files []string
 
@@ -585,8 +589,9 @@ func (module *SdkLibrary) createStubsSources(mctx android.LoadHookContext, apiSc
 		currentApiFileName = "test-" + currentApiFileName
 		removedApiFileName = "test-" + removedApiFileName
 	}
-	currentApiFileName = path.Join("api", currentApiFileName)
-	removedApiFileName = path.Join("api", removedApiFileName)
+	apiDir := module.getApiDir()
+	currentApiFileName = path.Join(apiDir, currentApiFileName)
+	removedApiFileName = path.Join(apiDir, removedApiFileName)
 	// TODO(jiyong): remove these three props
 	props.Api_tag_name = proptools.StringPtr(module.apiTagName(apiScope))
 	props.Api_filename = proptools.StringPtr(currentApiFileName)
@@ -701,6 +706,10 @@ func javaSdkLibraries(config android.Config) *[]string {
 	}).(*[]string)
 }
 
+func (module *SdkLibrary) getApiDir() string {
+	return proptools.StringDefault(module.sdkLibraryProperties.Api_dir, "api")
+}
+
 // For a java_sdk_library module, create internal modules for stubs, docs,
 // runtime libs and xml file. If requested, the stubs and docs are created twice
 // once for public API level and once for system API level
@@ -725,9 +734,10 @@ func (module *SdkLibrary) CreateInternalModules(mctx android.LoadHookContext) {
 
 	missing_current_api := false
 
+	apiDir := module.getApiDir()
 	for _, scope := range scopes {
 		for _, api := range []string{"current.txt", "removed.txt"} {
-			path := path.Join(mctx.ModuleDir(), "api", scope+api)
+			path := path.Join(mctx.ModuleDir(), apiDir, scope+api)
 			p := android.ExistentPathForSource(mctx, path)
 			if !p.Valid() {
 				mctx.ModuleErrorf("Current api file %#v doesn't exist", path)
@@ -747,7 +757,7 @@ func (module *SdkLibrary) CreateInternalModules(mctx android.LoadHookContext) {
 		mctx.ModuleErrorf("One or more current api files are missing. "+
 			"You can update them by:\n"+
 			"%s %q %s && m update-api",
-			script, mctx.ModuleDir(), strings.Join(scopes, " "))
+			script, filepath.Join(mctx.ModuleDir(), apiDir), strings.Join(scopes, " "))
 		return
 	}
 
diff --git a/scripts/gen-java-current-api-files.sh b/scripts/gen-java-current-api-files.sh
index 902fc2f50..547387a46 100755
--- a/scripts/gen-java-current-api-files.sh
+++ b/scripts/gen-java-current-api-files.sh
@@ -19,7 +19,7 @@ if [[ -z "$1" ]]; then
   exit 1
 fi
 
-api_dir=$1/api
+api_dir=$1
 shift
 
 mkdir -p "$api_dir"