Build the external/icing project in a self-contained manner.

The jarjar+android lib implementation is based on camera2-pipe.

This CL switches us away from AndroidXPlugin because that plugin
enforces API tracking, visibility restrictions and specific lints which
don't apply to an external project not exposed to 3p developers.

Bug: 160643524
Test: Presubmit
Change-Id: I46ac22bb600954e00b81287ce53bc86fa987c67b

2 files changed, 52 insertions, 45 deletions

diff --git a/java/build.gradle b/java/build.gradle
index 206c74f..4505960 100644
--- a/java/build.gradle
+++ b/java/build.gradle
@@ -14,41 +14,55 @@
  * limitations under the License.
  */
 
+import org.anarres.gradle.plugin.jarjar.JarjarTask
+
+import static androidx.build.SupportConfig.*
+import static androidx.build.dependencies.DependenciesKt.*
+
 buildscript {
-    boolean unbundleBuild = (new File('unbundled-build')).exists()
-    repositories {
-        maven { url '../../../prebuilts/androidx/external' }
-        if (unbundleBuild) {
-            jcenter()
-        }
-    }
     dependencies {
         classpath('gradle.plugin.com.google.protobuf:protobuf-gradle-plugin:0.8.8')
         classpath('org.anarres.jarjar:jarjar-gradle:1.0.1')
     }
 }
 
-apply plugin: 'java-library'
-apply plugin: 'com.google.protobuf'
-apply plugin: 'org.anarres.jarjar'
-apply plugin: 'idea'
+plugins {
+    id('com.android.library')
+    id('com.google.protobuf')
+    id('org.anarres.jarjar')
+}
 
-sourceSets {
-    main {
-        proto {
-            srcDir '../proto'
-            include '**/*.proto'
+android {
+    buildToolsVersion BUILD_TOOLS_VERSION
+    compileSdkVersion COMPILE_SDK_VERSION
+    defaultConfig {
+        minSdkVersion DEFAULT_MIN_SDK_VERSION
+        targetSdkVersion TARGET_SDK_VERSION
+        testInstrumentationRunner INSTRUMENTATION_RUNNER
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    sourceSets {
+        main {
+            java.srcDir 'src/'
+            manifest.srcFile '../AndroidManifest.xml'
+            proto.srcDir '../proto'
         }
+        androidTest.java.srcDir 'tests/instrumentation'
     }
 }
 
-compileJava {
-    sourceCompatibility = JavaVersion.VERSION_1_7
-    targetCompatibility = JavaVersion.VERSION_1_7
-}
-
 dependencies {
+    api('androidx.annotation:annotation:1.1.0')
+
+    implementation project(':icing:nativeLib')
     implementation('com.google.protobuf:protobuf-javalite:3.10.0')
+
+    androidTestImplementation(ANDROIDX_TEST_CORE)
+    androidTestImplementation(ANDROIDX_TEST_RULES)
+    androidTestImplementation(TRUTH)
 }
 
 protobuf {
@@ -67,21 +81,21 @@ protobuf {
     }
 }
 
-jarjar.repackage('jarjarTask') {
-    destinationName "icing-java-jarjar.jar"
-    from 'com.google.protobuf:protobuf-javalite:3.10.0'
-    from files(sourceSets.main.output.classesDirs)
-    dependsOn sourceSets.main.output
-    classRename 'com.google.protobuf.**', 'com.google.android.icing.protobuf.@1'
-}
-
-configurations {
-    jarjarConf
-}
+// Create jarjar artifact for all variants (debug/release)
+android.libraryVariants.all { variant ->
+    def variantName = variant.name
+    def suffix = variantName.capitalize()
+    def jarjarTask = tasks.create("jarjar${suffix}", JarjarTask) {
+        destinationName "icing-java-${variantName}-jarjar.jar"
+        from 'com.google.protobuf:protobuf-javalite:3.10.0'
+        from files(variant.javaCompileProvider.get().destinationDir)
+        dependsOn variant.javaCompileProvider.get()
+        classRename 'com.google.protobuf.**', 'com.google.android.icing.protobuf.@1'
+    }
 
-artifacts {
-    jarjarConf(jarjarTask.destinationPath) {
-        name 'icing-java-jarjar'
+    def jarjarConf = configurations.register("jarjar${suffix}")
+    artifacts.add("${jarjarConf.name}", jarjarTask.destinationPath) {
+        name "icing-java-${variantName}-jarjar"
         type 'jar'
         builtBy jarjarTask
     }
diff --git a/java/src/com/google/android/icing/IcingSearchEngine.java b/java/src/com/google/android/icing/IcingSearchEngine.java
index b221592..9e63b9f 100644
--- a/java/src/com/google/android/icing/IcingSearchEngine.java
+++ b/java/src/com/google/android/icing/IcingSearchEngine.java
@@ -16,8 +16,6 @@ package com.google.android.icing;
 
 import android.util.Log;
 import androidx.annotation.NonNull;
-import androidx.annotation.RestrictTo;
-
 import com.google.android.icing.proto.DeleteByNamespaceResultProto;
 import com.google.android.icing.proto.DeleteBySchemaTypeResultProto;
 import com.google.android.icing.proto.DeleteResultProto;
@@ -39,14 +37,9 @@ import com.google.android.icing.proto.SearchResultProto;
 import com.google.android.icing.proto.SearchSpecProto;
 import com.google.android.icing.proto.SetSchemaResultProto;
 import com.google.android.icing.proto.StatusProto;
-import com.google.android.icing.protobuf.InvalidProtocolBufferException;
-
-/**
- * Java wrapper to access native APIs in external/icing/icing/icing-search-engine.h
- *
- * @hide
- */
-@RestrictTo(RestrictTo.Scope.LIBRARY_GROUP)
+import com.google.protobuf.InvalidProtocolBufferException;
+
+/** Java wrapper to access native APIs in external/icing/icing/icing-search-engine.h */
 public final class IcingSearchEngine {
 
   private static final String TAG = "IcingSearchEngine";