Move icing to be a simple java project

Since icing is only bundled inside of appsearch:appsearch-local-storage
there is no need to use an android project as at the end of the day we
end up only including the jar of icing anyway. Moving to a java project
simplifies is as now we no longer need to add special export
configurations.

We are also moving the dropping of *.proto files to the projects
that bundle the libraries.

This is a step towards making it easier to resolve what artifact
coordinates were actually bundled inside.

Test: ./gradlew appsearch:appsearch-local-storage:publish
      comparing out/androidx/build/support_repo/androidx/appsearch/appsearch-local-storage/1.1.0-alpha04/appsearch-local-storage-1.1.0-alpha04.aar
      before and after the change, libs/repackaged.jar is identical
Bug: 296864329
Change-Id: Ibba769f71ecdb58cb20df0ea0c37364cf579eddf

3 files changed, 22 insertions, 59 deletions

diff --git a/build.gradle b/build.gradle
index dde0637..d0d1a39 100644
--- a/build.gradle
+++ b/build.gradle
@@ -14,57 +14,42 @@
  * limitations under the License.
  */
 
+import androidx.build.SdkHelperKt
+
 plugins {
-    id('AndroidXPlugin')
-    id('com.android.library')
-    id('com.google.protobuf')
+    id("AndroidXPlugin")
+    id("java-library")
+    id("com.google.protobuf")
 }
 
-android {
-    compileOptions {
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
-    }
-    sourceSets {
-        main {
-            java.srcDir 'java/src/'
-            proto.srcDir 'proto/'
-        }
-        // TODO(b/161205849): Re-enable this test once icing nativeLib is no longer being built
-        //  inside appsearch:appsearch.
-        //androidTest.java.srcDir 'java/tests/instrumentation/'
+sourceSets {
+    main {
+        java.srcDir 'java/src/'
+        proto.srcDir 'proto/'
     }
-    namespace "com.google.android.icing"
-}
-
-// This project has no device tests, skip building it
-androidComponents {
-    beforeVariants(selector().withName("debug"), { variantBuilder ->
-        variantBuilder.enableAndroidTest = false
-    })
 }
 
 dependencies {
-    api('androidx.annotation:annotation:1.1.0')
-
-    implementation('com.google.protobuf:protobuf-javalite:3.10.0')
+    compileOnly("androidx.annotation:annotation:1.1.0")
+    compileOnly(SdkHelperKt.getSdkDependency(project))
+    implementation(libs.protobufLite)
+}
 
-    androidTestImplementation(libs.testCore)
-    androidTestImplementation(libs.testRules)
-    androidTestImplementation(libs.truth)
-    androidTestImplementation(libs.kotlinBom)
+afterEvaluate {
+    lint {
+        lintOptions {
+            // protobuf generates unannotated methods
+            disable("UnknownNullness")
+        }
+    }
 }
 
 protobuf {
     protoc {
         artifact = libs.protobufCompiler.get()
     }
-
     generateProtoTasks {
         all().each { task ->
-            project.tasks.named("extractReleaseAnnotations").configure {
-                it.dependsOn(task)
-            }
             task.builtins {
                 java {
                     option 'lite'
@@ -74,30 +59,6 @@ protobuf {
     }
 }
 
-// Create export artifact for all variants (debug/release) for JarJaring
-android.libraryVariants.all { variant ->
-    def variantName = variant.name
-    def suffix = variantName.capitalize()
-    def exportJarTask = tasks.register("exportJar${suffix}", Jar) {
-        archiveBaseName.set("icing-${variantName}")
-
-        // The proto-lite dependency includes .proto files, which are not used by icing. When apps
-        // depend on appsearch as well as proto-lite directly, these files conflict since jarjar
-        // only renames the java classes. Remove them here since they are unused.
-        // Expand the jar and remove any .proto files.
-        from(zipTree(configurations.detachedConfiguration(
-                dependencies.create(libs.protobufLite.get())).getSingleFile())) {
-            exclude("**/*.proto")
-        }
-
-        from files(variant.javaCompileProvider.get().destinationDir)
-        dependsOn variant.javaCompileProvider.get()
-    }
-
-    def exportConfiguration = configurations.register("export${suffix}")
-    artifacts.add(exportConfiguration.name, exportJarTask.flatMap { it.archiveFile })
-}
-
 androidx {
     mavenVersion = LibraryVersions.APPSEARCH
 }
diff --git a/java/src/com/google/android/icing/IcingSearchEngine.java b/java/src/com/google/android/icing/IcingSearchEngine.java
index 47b94a5..79fcdb8 100644
--- a/java/src/com/google/android/icing/IcingSearchEngine.java
+++ b/java/src/com/google/android/icing/IcingSearchEngine.java
@@ -77,6 +77,7 @@ public class IcingSearchEngine implements IcingSearchEngineInterface {
     icingSearchEngineImpl.close();
   }
 
+  @SuppressWarnings("deprecation")
   @Override
   protected void finalize() throws Throwable {
     icingSearchEngineImpl.close();
diff --git a/java/src/com/google/android/icing/IcingSearchEngineImpl.java b/java/src/com/google/android/icing/IcingSearchEngineImpl.java
index 8e79a88..57744c4 100644
--- a/java/src/com/google/android/icing/IcingSearchEngineImpl.java
+++ b/java/src/com/google/android/icing/IcingSearchEngineImpl.java
@@ -71,6 +71,7 @@ public class IcingSearchEngineImpl implements Closeable {
     closed = true;
   }
 
+  @SuppressWarnings("deprecation")
   @Override
   protected void finalize() throws Throwable {
     close();