Build hilt_android and its annotation processors

Add Android.bp rules for hilt_android and its many annotation
processors.  Hilt uses 7 separate annotation processors.  To reduce
compilation and runtime cost, compile them all together into
a single library, and embed it into a single java_plugin module.
The rest of the java_plugin modules provide the name of a processor
class, but contain no classes themselves.

Bug: 173800389
Test: mma
Change-Id: I0f255f7749e49f5ef1d49f354a93103df124efb9

3 files changed, 158 insertions, 2 deletions

diff --git a/Android.bp b/Android.bp
index 6612f8cc7..0a095bb4e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -83,6 +83,13 @@ java_plugin {
     visibility: ["//visibility:public"],
     processor_class: "dagger.internal.codegen.ComponentProcessor",
     generates_api: true,
+    static_libs: ["dagger2-compiler-lib"],
+    // shade guava to avoid conflicts with guava embedded in Error Prone.
+    jarjar_rules: "jarjar-rules.txt",
+}
+
+java_library_host {
+    name: "dagger2-compiler-lib",
     use_tools_jar: true,
 
     srcs: [
@@ -114,8 +121,6 @@ java_plugin {
         "kotlinx_metadata_jvm",
     ],
 
-    // shade guava to avoid conflicts with guava embedded in Error Prone.
-    jarjar_rules: "jarjar-rules.txt",
 
     libs: [
         "auto_factory_annotations",
@@ -150,3 +155,152 @@ java_library {
     sdk_version: "core_current",
     srcs: ["android-annotation-stubs/src/**/*.java"],
 }
+
+// build core hilt library
+
+java_library {
+    name: "hilt_core",
+    srcs: [
+        "java/dagger/hilt/*.java",
+        "java/dagger/hilt/codegen/*.java",
+        "java/dagger/hilt/components/*.java",
+        "java/dagger/hilt/internal/*.java",
+        "java/dagger/hilt/internal/aliasof/*.java",
+        "java/dagger/hilt/internal/definecomponent/*.java",
+        "java/dagger/hilt/internal/generatesrootinput/*.java",
+        "java/dagger/hilt/migration/*.java",
+        "java/dagger/hilt/processor/internal/aggregateddeps/AggregatedDeps.java",
+    ],
+    static_libs: [
+        "jsr305",
+        "jsr330",
+        "dagger2",
+    ],
+    sdk_version: "core_current",
+}
+
+// Build the android hilt library.  Depending on this will enable the Hilt annotation processors.
+
+android_library {
+    name: "hilt_android",
+    visibility: ["//visibility:public"],
+
+    srcs: [
+        "java/dagger/hilt/android/*.java",
+        "java/dagger/hilt/android/components/*.java",
+        "java/dagger/hilt/android/migration/*.java",
+        "java/dagger/hilt/android/qualifiers/*.java",
+        "java/dagger/hilt/android/scopes/*.java",
+        "java/dagger/hilt/android/internal/*.java",
+        "java/dagger/hilt/android/internal/builders/*.java",
+        "java/dagger/hilt/android/internal/lifecycle/*.java",
+        "java/dagger/hilt/android/internal/managers/*.java",
+        "java/dagger/hilt/android/internal/migration/*.java",
+        "java/dagger/hilt/android/internal/modules/*.java",
+    ],
+    manifest: "java/dagger/hilt/android/AndroidManifest.xml",
+    static_libs: [
+        "androidx.annotation_annotation",
+        "androidx.fragment_fragment",
+        "jsr305",
+        "jsr330",
+        "dagger2",
+        "hilt_core",
+    ],
+    sdk_version: "current",
+    min_sdk_version: "14",
+
+    exported_plugins: [
+        "dagger2-compiler",
+        "hilt_android_entry_point_processor",
+        "hilt_aggregated_deps_processor",
+        "hilt_alias_of_processor",
+        "hilt_define_component_processor",
+        "hilt_generates_root_input_processor",
+        "hilt_originating_element_processor",
+        "hilt_root_processor",
+    ],
+}
+
+// Hilt has many annotation processors.  To reduce compilation and runtime cost, they are all compiled
+// into hilt_android_processors.  A java_plugin can only expose a single processor class, so each has
+// to be defined separately.  Since they are not visible outside this package and will always be
+// exported together, only the first actually contains the annotation processor classes.
+
+java_plugin {
+    name: "hilt_android_entry_point_processor",
+    generates_api: true,
+    processor_class: "dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessor",
+    static_libs: ["hilt_android_processors"],
+}
+
+java_plugin {
+    name: "hilt_aggregated_deps_processor",
+    generates_api: true,
+    processor_class: "dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessor",
+}
+
+java_plugin {
+    name: "hilt_alias_of_processor",
+    generates_api: true,
+    processor_class: "dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessor",
+}
+
+java_plugin {
+    name: "hilt_define_component_processor",
+    generates_api: true,
+    processor_class: "dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessor",
+}
+
+java_plugin {
+    name: "hilt_generates_root_input_processor",
+    generates_api: true,
+    processor_class: "dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessor",
+}
+
+java_plugin {
+    name: "hilt_originating_element_processor",
+    generates_api: true,
+    processor_class: "dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessor",
+}
+
+java_plugin {
+    name: "hilt_root_processor",
+    generates_api: true,
+    processor_class: "dagger.hilt.android.processor.internal.androidentrypoint.AndroidEntryPointProcessor",
+}
+
+java_library_host {
+    name: "hilt_android_processors",
+    use_tools_jar: true,
+    srcs: [
+        "java/dagger/hilt/android/processor/**/*.java",
+        "java/dagger/hilt/codegen/*.java",
+        "java/dagger/hilt/processor/internal/**/*.java",
+    ],
+    exclude_srcs: [
+        "java/dagger/hilt/android/processor/internal/bindvalue/*.java",
+    ],
+    plugins: [
+        "auto_service_plugin",
+        "auto_value_plugin",
+        "auto_value_memoized_extension_plugin",
+    ],
+    static_libs: [
+        "auto_common",
+        "auto_service_annotations",
+        "auto_value_annotations",
+        "auto_value_memoized_extension_annotations",
+        "guava",
+        "jsr305",
+        "dagger2-compiler-lib",
+        "dagger2",
+        "javapoet",
+        "jsr330",
+        "kotlin-stdlib",
+        "kotlinx_metadata_jvm",
+        "dagger2-android-annotation-stubs",
+    ],
+    // shade guava to avoid conflicts with guava embedded in Error Prone.
+    jarjar_rules: "jarjar-rules.txt",
+}
diff --git a/android-annotation-stubs/gen_annotations.sh b/android-annotation-stubs/gen_annotations.sh
index ff3ed4b4f..d4a029029 100755
--- a/android-annotation-stubs/gen_annotations.sh
+++ b/android-annotation-stubs/gen_annotations.sh
@@ -59,6 +59,7 @@ cat > ${f} <<EOF
 
 package net.ltgt.gradle.incap;
 public enum IncrementalAnnotationProcessorType {
+  AGGREGATING,
   DYNAMIC,
   ISOLATING
 }
diff --git a/android-annotation-stubs/src/net/ltgt/gradle/incap/IncrementalAnnotationProcessorType.java b/android-annotation-stubs/src/net/ltgt/gradle/incap/IncrementalAnnotationProcessorType.java
index 1d7fc30ad..ef86328ae 100644
--- a/android-annotation-stubs/src/net/ltgt/gradle/incap/IncrementalAnnotationProcessorType.java
+++ b/android-annotation-stubs/src/net/ltgt/gradle/incap/IncrementalAnnotationProcessorType.java
@@ -16,6 +16,7 @@
 
 package net.ltgt.gradle.incap;
 public enum IncrementalAnnotationProcessorType {
+  AGGREGATING,
   DYNAMIC,
   ISOLATING
 }