Create LibraryRClassGeneratorAction for generating R classes outside of the
AndroidResourceMergingAction.

--
PiperOrigin-RevId: 144726723
MOS_MIGRATED_REVID=144726723

src/tools/android/java/com/google/devtools/build/android/BUILD

diff --git a/src/tools/android/java/com/google/devtools/build/android/BUILD b/src/tools/android/java/com/google/devtools/build/android/BUILD
index 18b8b07..a132eea 100644
--- a/src/tools/android/java/com/google/devtools/build/android/BUILD
+++ b/src/tools/android/java/com/google/devtools/build/android/BUILD
@@ -74,6 +74,14 @@
 )
 
 java_binary(
+    name = "LibraryRClassGeneratorAction",
+    main_class = "com.google.devtools.build.android.LibraryRClassGeneratorAction",
+    runtime_deps = [
+        ":android_builder_lib",
+    ],
+)
+
+java_binary(
     name = "ResourceShrinkerAction",
     main_class = "com.google.devtools.build.android.ResourceShinkerAction",
     runtime_deps = [

src/tools/android/java/com/google/devtools/build/android/BUILD.tools

diff --git a/src/tools/android/java/com/google/devtools/build/android/BUILD.tools b/src/tools/android/java/com/google/devtools/build/android/BUILD.tools
index 444bf4f..ab09887 100644
--- a/src/tools/android/java/com/google/devtools/build/android/BUILD.tools
+++ b/src/tools/android/java/com/google/devtools/build/android/BUILD.tools
@@ -62,6 +62,14 @@
 )
 
 java_binary(
+    name = "LibraryRClassGeneratorAction",
+    main_class = "com.google.devtools.build.android.LibraryRClassGeneratorAction",
+    runtime_deps = [
+        ":classes",
+    ],
+)
+
+java_binary(
     name = "ResourceShrinkerAction",
     main_class = "com.google.devtools.build.android.ResourceShrinkerAction",
     runtime_deps = [

src/tools/android/java/com/google/devtools/build/android/LibraryRClassGeneratorAction.java

diff --git a/src/tools/android/java/com/google/devtools/build/android/LibraryRClassGeneratorAction.java b/src/tools/android/java/com/google/devtools/build/android/LibraryRClassGeneratorAction.java
new file mode 100644
index 0000000..941c98c
--- /dev/null
+++ b/src/tools/android/java/com/google/devtools/build/android/LibraryRClassGeneratorAction.java
@@ -0,0 +1,116 @@
+// Copyright 2017 The Bazel Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.google.devtools.build.android;
+
+import com.android.ide.common.res2.MergingException;
+import com.android.utils.StdLogger;
+import com.google.common.base.Stopwatch;
+import com.google.common.base.Strings;
+import com.google.devtools.build.android.AndroidResourceProcessor.AaptConfigOptions;
+import com.google.devtools.build.android.Converters.PathConverter;
+import com.google.devtools.build.android.Converters.PathListConverter;
+import com.google.devtools.common.options.Option;
+import com.google.devtools.common.options.OptionsBase;
+import com.google.devtools.common.options.OptionsParser;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * Generates the R class for an android_library with made up field initializers for the ids. The
+ * real ids will be assigned when the android_binary is built.
+ *
+ * <p>Collects the R class fields from the parsed resource, and then writes out the resource class
+ * files to a jar.
+ */
+public class LibraryRClassGeneratorAction {
+
+  private static final Logger logger =
+      Logger.getLogger(LibraryRClassGeneratorAction.class.getName());
+
+  private static final StdLogger stdLogger = new StdLogger(StdLogger.Level.WARNING);
+
+  /** Flag specifications for this action. */
+  public static final class Options extends OptionsBase {
+    @Option(
+      name = "classJarOutput",
+      defaultValue = "null",
+      converter = PathConverter.class,
+      category = "output",
+      help = "Path for the generated java class jar."
+    )
+    public Path classJarOutput;
+
+    @Option(
+      name = "packageForR",
+      defaultValue = "null",
+      category = "config",
+      help = "Custom java package to generate the R symbols files."
+    )
+    public String packageForR;
+
+    @Option(
+      name = "symbols",
+      defaultValue = "",
+      converter = PathListConverter.class,
+      category = "config",
+      help = "Parsed symbol binaries to write as R classes."
+    )
+    public List<Path> symbols;
+  }
+
+  public static void main(String[] args) throws Exception {
+    final Stopwatch timer = Stopwatch.createStarted();
+    OptionsParser optionsParser =
+        OptionsParser.newOptionsParser(Options.class, AaptConfigOptions.class);
+    optionsParser.parseAndExitUponError(args);
+    AaptConfigOptions aaptConfigOptions = optionsParser.getOptions(AaptConfigOptions.class);
+    Options options = optionsParser.getOptions(Options.class);
+    logger.fine(
+        String.format("Option parsing finished at %sms", timer.elapsed(TimeUnit.MILLISECONDS)));
+    try (ScopedTemporaryDirectory scopedTmp =
+        new ScopedTemporaryDirectory("android_resource_generated")) {
+      AndroidResourceClassWriter resourceClassWriter =
+          AndroidResourceClassWriter.createWith(
+              aaptConfigOptions.androidJar,
+              scopedTmp.getPath(),
+              Strings.nullToEmpty(options.packageForR));
+      resourceClassWriter.setIncludeClassFile(true);
+      resourceClassWriter.setIncludeJavaFile(false);
+      final AndroidResourceProcessor resourceProcessor = new AndroidResourceProcessor(stdLogger);
+      logger.fine(String.format("Setup finished at %sms", timer.elapsed(TimeUnit.MILLISECONDS)));
+
+      final ParsedAndroidData data =
+          resourceProcessor.deserializeSymbolsToData(options.symbols);
+      logger.fine(
+          String.format("Deserialization finished at %sms", timer.elapsed(TimeUnit.MILLISECONDS)));
+
+      data.writeResourcesTo(resourceClassWriter);
+      resourceClassWriter.flush();
+      logger.fine(
+          String.format("R writing finished at %sms", timer.elapsed(TimeUnit.MILLISECONDS)));
+
+      resourceProcessor.createClassJar(scopedTmp.getPath(), options.classJarOutput);
+      logger.fine(
+          String.format(
+              "Creating class jar finished at %sms", timer.elapsed(TimeUnit.MILLISECONDS)));
+    } catch (IOException | MergingException | DeserializationException e) {
+      logger.log(Level.SEVERE, "Errors during R generation.", e);
+      throw e;
+    }
+  }
+}