com.facebook.buck.android.exopackage.DexExoHelper.java Source code

Introduction

Here is the source code for com.facebook.buck.android.exopackage.DexExoHelper.java

Source

/*
 * Copyright 2017-present Facebook, Inc.
 *
 * 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.facebook.buck.android.exopackage;

import com.facebook.buck.core.sourcepath.resolver.SourcePathResolver;
import com.facebook.buck.io.filesystem.ProjectFilesystem;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableMultimap;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Map;

public class DexExoHelper {
    @VisibleForTesting
    public static final Path SECONDARY_DEX_DIR = Paths.get("secondary-dex");
    private final SourcePathResolver pathResolver;
    private final ProjectFilesystem projectFilesystem;
    private final ExopackageInfo.DexInfo dexInfo;

    DexExoHelper(SourcePathResolver pathResolver, ProjectFilesystem projectFilesystem,
            ExopackageInfo.DexInfo dexInfo) {
        this.pathResolver = pathResolver;
        this.projectFilesystem = projectFilesystem;
        this.dexInfo = dexInfo;
    }

    public ImmutableMap<Path, Path> getFilesToInstall() throws IOException {
        return ExopackageUtil.applyFilenameFormat(getRequiredDexFiles(), SECONDARY_DEX_DIR, "secondary-%s.dex.jar");
    }

    public ImmutableMap<Path, String> getMetadataToInstall() throws IOException {
        return ImmutableMap.of(SECONDARY_DEX_DIR.resolve("metadata.txt"), getSecondaryDexMetadataContents());
    }

    private String getSecondaryDexMetadataContents() throws IOException {
        // This is a bit gross.  It was a late addition.  Ideally, we could eliminate this, but
        // it wouldn't be terrible if we don't.  We store the dexed jars on the device
        // with the full SHA-1 hashes in their names.  This is the format that the loader uses
        // internally, so ideally we would just load them in place.  However, the code currently
        // expects to be able to copy the jars from a directory that matches the name in the
        // metadata file, like "secondary-1.dex.jar".  We don't want to give up putting the
        // hashes in the file names (because we use that to skip re-uploads), so just hack
        // the metadata file to have hash-like names.
        return com.google.common.io.Files
                .toString(pathResolver.getAbsolutePath(dexInfo.getMetadata()).toFile(), Charsets.UTF_8)
                .replaceAll("secondary-(\\d+)\\.dex\\.jar (\\p{XDigit}{40}) ", "secondary-$2.dex.jar $2 ");
    }

    private ImmutableMap<String, Path> getRequiredDexFiles() throws IOException {
        ImmutableMultimap<String, Path> multimap = ExopackageInstaller.parseExopackageInfoMetadata(
                pathResolver.getAbsolutePath(dexInfo.getMetadata()),
                pathResolver.getAbsolutePath(dexInfo.getDirectory()), projectFilesystem);
        // Convert multimap to a map, because every key should have only one value.
        ImmutableMap.Builder<String, Path> builder = ImmutableMap.builder();
        for (Map.Entry<String, Path> entry : multimap.entries()) {
            builder.put(entry);
        }
        return builder.build();
    }
}