SystemApi is parameterized

We have decided to reuse the existing annotation @SystemApi for all Java
APIs regardless of whether they are for apps or platform internal
modules. This was because introducing new annotation types every time
when we have to create new API surfaces will only increase the confusion
without giving much benefit.

Instead, to differenciate the different API surfaces of @SystemApi, the
annotation type is parameterized. Specifically, it has to axises.

client: specifies the intended client of the API.

process: specifies the process(es) that the API is available.

The default for client and process are priv-apps and all, respectively,
which corresponds to the today's @SystemApi for privileged apps like
GMS.

Exempt-From-Owner-Approval: cherry-pick from internal

Bug: 140202860
Test: m
Merged-In: I3305b71e22970e80db95f3daf3d7713603c7d68d
(cherry picked from commit 119afc0695cf7632700119bab62a965793c34fd1)
Change-Id: I3305b71e22970e80db95f3daf3d7713603c7d68d

Android.bp

@@ -1123,7 +1123,7 @@ droidstubs {
     arg_files: [
         "core/res/AndroidManifest.xml",
     ],
-    args: metalava_framework_docs_args + " --show-annotation android.annotation.SystemApi ",
+    args: metalava_framework_docs_args + " --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.PRIVILEGED_APPS,process=android.annotation.SystemApi.Process.ALL\\) ",
     write_sdk_values: true,
 }
 
@@ -1434,7 +1434,7 @@ droidstubs {
     merge_annotations_dirs: [
         "metalava-manual",
     ],
-    args: " --show-annotation android.annotation.SystemApi",
+    args: " --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.PRIVILEGED_APPS,process=android.annotation.SystemApi.Process.ALL\\)",
 }
 
 java_library_static {
@@ -1456,7 +1456,7 @@ droidstubs {
     removed_dex_api_filename: "removed-dex.txt",
     args: metalava_framework_docs_args +
         " --show-unannotated " +
-        " --show-annotation android.annotation.SystemApi " +
+        " --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.PRIVILEGED_APPS,process=android.annotation.SystemApi.Process.ALL\\) " +
         " --show-annotation android.annotation.TestApi ",
 }
 
@@ -1475,7 +1475,7 @@ droidstubs {
         " --hide ReferencesHidden " +
         " --hide UnhiddenSystemApi " +
         " --show-unannotated " +
-        " --show-annotation android.annotation.SystemApi " +
+        " --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.PRIVILEGED_APPS,process=android.annotation.SystemApi.Process.ALL\\) " +
         " --show-annotation android.annotation.TestApi ",
 }
 
@@ -1519,7 +1519,7 @@ droidstubs {
     arg_files: [
         "core/res/AndroidManifest.xml",
     ],
-    args: metalava_framework_docs_args + " --show-annotation android.annotation.SystemApi",
+    args: metalava_framework_docs_args + " --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.PRIVILEGED_APPS,process=android.annotation.SystemApi.Process.ALL\\)",
     check_api: {
         current: {
             api_file: "api/system-current.txt",

core/java/android/annotation/SystemApi.java

@@ -41,4 +41,29 @@ import java.lang.annotation.Target;
 @Target({TYPE, FIELD, METHOD, CONSTRUCTOR, ANNOTATION_TYPE, PACKAGE})
 @Retention(RetentionPolicy.RUNTIME)
 public @interface SystemApi {
+    enum Client {
+        /**
+         * Specifies that the intended clients of a SystemApi are privileged apps.
+         * This is the default value for {@link #client}.
+         */
+        PRIVILEGED_APPS,
+    }
+
+    enum Process {
+        /**
+         * Specifies that the SystemAPI is available in every Java processes.
+         * This is the default value for {@link #process}.
+         */
+        ALL,
+    }
+
+    /**
+     * The intended client of this SystemAPI.
+     */
+    Client client() default android.annotation.SystemApi.Client.PRIVILEGED_APPS;
+
+    /**
+     * The process(es) that this SystemAPI is available
+     */
+    Process process() default android.annotation.SystemApi.Process.ALL;
 }

media/Android.bp

@@ -66,7 +66,7 @@ metalava_updatable_media_args = " --error UnhiddenSystemApi " +
     "--hide MissingPermission --hide BroadcastBehavior " +
     "--hide HiddenSuperclass --hide DeprecationMismatch --hide UnavailableSymbol " +
     "--hide SdkConstant --hide HiddenTypeParameter --hide Todo --hide Typo " +
-    "--hide HiddenTypedefConstant --show-annotation android.annotation.SystemApi "
+    "--hide HiddenTypedefConstant --show-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.PRIVILEGED_APPS,process=android.annotation.SystemApi.Process.ALL\\) "
 
 droidstubs {
     name: "updatable-media-stubs",

services/Android.bp

@@ -110,7 +110,7 @@ droidstubs {
     srcs: [":services-sources"],
     installable: false,
     // TODO: remove the --hide options below
-    args: " --show-single-annotation android.annotation.SystemApi" +
+    args: " --show-single-annotation android.annotation.SystemApi\\(client=android.annotation.SystemApi.Client.INTERNAL,process=android.annotation.SystemApi.Process.SYSTEM_SERVER\\)" +
         " --hide-annotation android.annotation.Hide" +
         " --hide-package com.google.android.startop.iorap" +
         " --hide ReferencesHidden" +