com.google.devtools.build.android.Aapt2ResourceShrinkingAction.java Source code

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Here is the source code for com.google.devtools.build.android.Aapt2ResourceShrinkingAction.java

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// 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 static java.util.stream.Collectors.toSet;

import com.android.builder.core.VariantConfiguration;
import com.google.common.collect.ImmutableList;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import com.google.devtools.build.android.ResourceShrinkerAction.Options;
import com.google.devtools.build.android.aapt2.Aapt2ConfigOptions;
import com.google.devtools.build.android.aapt2.CompiledResources;
import com.google.devtools.build.android.aapt2.ResourceCompiler;
import com.google.devtools.build.android.aapt2.ResourceLinker;
import com.google.devtools.build.android.aapt2.StaticLibrary;
import com.google.devtools.common.options.OptionsParser;
import com.google.devtools.common.options.ShellQuotedParamsFilePreProcessor;
import java.io.Closeable;
import java.io.File;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.util.concurrent.ExecutionException;
import java.util.function.Function;

/**
 * An action to perform resource shrinking using the Gradle resource shrinker.
 *
 * <pre>
 * Example Usage:
 *   java/com/google/build/android/ResourceShrinkerAction
 *       --aapt2 path to sdk/aapt2
 *       --annotationJar path to sdk/annotationJar
 *       --androidJar path to sdk/androidJar
 *       --shrunkJar path to proguard dead code removal jar
 *       --resources path to processed resources zip
 *       --rTxt path to processed resources R.txt
 *       --primaryManifest path to processed resources AndroidManifest.xml
 *       --dependencyManifest path to dependency library manifest (repeated flag)
 *       --shrunkResourceApk path to write shrunk ap_
 *       --shrunkResources path to write shrunk resources zip
 * </pre>
 */
public class Aapt2ResourceShrinkingAction {

    public static void main(String[] args) throws Exception {
        final Profiler profiler = LoggingProfiler.createAndStart("shrink").startTask("flags");
        // Parse arguments.
        OptionsParser optionsParser = OptionsParser.newOptionsParser(Options.class, Aapt2ConfigOptions.class);
        optionsParser.enableParamsFileSupport(new ShellQuotedParamsFilePreProcessor(FileSystems.getDefault()));
        optionsParser.parseAndExitUponError(args);
        Aapt2ConfigOptions aapt2ConfigOptions = optionsParser.getOptions(Aapt2ConfigOptions.class);
        Options options = optionsParser.getOptions(Options.class);
        options.dependencyManifests = Converters.concatLists(options.dependencyManifests,
                options.deprecatedDependencyManifests);
        profiler.recordEndOf("flags").startTask("setup");

        final ListeningExecutorService executorService = ExecutorServiceCloser.createDefaultService();
        try (ScopedTemporaryDirectory scopedTmp = new ScopedTemporaryDirectory("android_resources_tmp");
                Closeable closer = ExecutorServiceCloser.createWith(executorService)) {

            Path workingResourcesDirectory = scopedTmp.subDirectoryOf("resources");
            final ResourceCompiler resourceCompiler = ResourceCompiler.create(executorService,
                    workingResourcesDirectory, aapt2ConfigOptions.aapt2, aapt2ConfigOptions.buildToolsVersion);
            profiler.recordEndOf("setup").startTask("compile");

            final ResourcesZip resourcesZip = ResourcesZip.createFrom(options.resourcesZip,
                    scopedTmp.subDirectoryOf("merged-resources"));
            final CompiledResources compiled = resourcesZip
                    .shrink(options.dependencyManifests.stream().map(Path::toFile)
                            .map(manifestToPackageUsing(executorService)).map(futureToString()).collect(toSet()),
                            options.rTxt, options.shrunkJar, options.primaryManifest, options.proguardMapping,
                            options.log, scopedTmp.subDirectoryOf("shrunk-resources"))
                    .writeArchiveTo(options.shrunkResources, false)
                    .compile(resourceCompiler, workingResourcesDirectory);
            profiler.recordEndOf("compile");

            ResourceLinker.create(aapt2ConfigOptions.aapt2, scopedTmp.subDirectoryOf("linking"))
                    .profileUsing(profiler)
                    .dependencies(ImmutableList.of(StaticLibrary.from(aapt2ConfigOptions.androidJar)))
                    .link(compiled).copyPackageTo(options.shrunkApk).copyRTxtTo(options.rTxtOutput);
            profiler.recordEndOf("shrink");
        }
    }

    static Function<File, ListenableFuture<String>> manifestToPackageUsing(ListeningExecutorService executor) {
        return f -> executor.submit(() -> VariantConfiguration.getManifestPackage(f));
    }

    static Function<ListenableFuture<String>, String> futureToString() {
        return f -> {
            try {
                return f.get();
            } catch (InterruptedException | ExecutionException e) {
                throw new RuntimeException(e);
            }
        };
    }
}