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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.resources;
import com.android.builder.core.VariantConfiguration;
import com.android.builder.dependency.SymbolFileProvider;
import com.android.resources.ResourceType;
import com.google.common.collect.HashMultimap;
import com.google.common.collect.Multimap;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.ListeningExecutorService;
import java.io.File;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.Collection;
import java.util.EnumMap;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.TreeMap;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.logging.Logger;
import javax.annotation.Nullable;
/** Encapsulates the logic for loading and writing resource symbols. */
public class ResourceSymbols {
private static final Logger logger = Logger.getLogger(ResourceSymbols.class.getCanonicalName());
/** Task to load and parse R.txt symbols */
private static final class SymbolLoadingTask implements Callable<ResourceSymbols> {
private final Path rTxtSymbols;
SymbolLoadingTask(Path symbolFile) {
this.rTxtSymbols = symbolFile;
}
@Override
public ResourceSymbols call() throws Exception {
List<String> lines = Files.readAllLines(rTxtSymbols, StandardCharsets.UTF_8);
Map<ResourceType, Map<String, FieldInitializer>> initializers =
new EnumMap<>(ResourceType.class);
for (int lineIndex = 1; lineIndex <= lines.size(); lineIndex++) {
String line = null;
try {
line = lines.get(lineIndex - 1);
// format is "<type> <class> <name> <value>"
// don't want to split on space as value could contain spaces.
int pos = line.indexOf(' ');
String type = line.substring(0, pos);
int pos2 = line.indexOf(' ', pos + 1);
String className = line.substring(pos + 1, pos2);
int pos3 = line.indexOf(' ', pos2 + 1);
String name = line.substring(pos2 + 1, pos3);
String value = line.substring(pos3 + 1);
final ResourceType resourceType = ResourceType.getEnum(className);
final Map<String, FieldInitializer> fields;
if (initializers.containsKey(resourceType)) {
fields = initializers.get(resourceType);
} else {
fields = new TreeMap<>();
initializers.put(resourceType, fields);
}
if ("int".equals(type)) {
fields.put(name, IntFieldInitializer.of(value));
} else {
fields.put(name, IntArrayFieldInitializer.of(value));
}
} catch (IndexOutOfBoundsException e) {
String s =
String.format(
"File format error reading %s\tline %d: '%s'",
rTxtSymbols.toString(), lineIndex, line);
logger.severe(s);
throw new IOException(s, e);
}
}
return ResourceSymbols.from(FieldInitializers.copyOf(initializers));
}
}
private static final class PackageParsingTask implements Callable<String> {
private final File manifest;
PackageParsingTask(File manifest) {
this.manifest = manifest;
}
@Override
public String call() throws Exception {
return VariantConfiguration.getManifestPackage(manifest);
}
}
/**
* Loads the SymbolTables from a list of SymbolFileProviders.
*
* @param dependencies The full set of library symbols to load.
* @param executor The executor use during loading.
* @param packageToExclude A string package to elide if it exists in the providers.
* @return A list of loading {@link ResourceSymbols} instances.
* @throws ExecutionException
* @throws InterruptedException when there is an error loading the symbols.
*/
public static Multimap<String, ListenableFuture<ResourceSymbols>> loadFrom(
Iterable<? extends SymbolFileProvider> dependencies,
ListeningExecutorService executor,
@Nullable String packageToExclude)
throws InterruptedException, ExecutionException {
Map<SymbolFileProvider, ListenableFuture<String>> providerToPackage = new HashMap<>();
for (SymbolFileProvider dependency : dependencies) {
providerToPackage.put(
dependency, executor.submit(new PackageParsingTask(dependency.getManifest())));
}
Multimap<String, ListenableFuture<ResourceSymbols>> packageToTable = HashMultimap.create();
for (Map.Entry<SymbolFileProvider, ListenableFuture<String>> entry :
providerToPackage.entrySet()) {
File symbolFile = entry.getKey().getSymbolFile();
if (!Objects.equals(entry.getValue().get(), packageToExclude)) {
packageToTable.put(entry.getValue().get(), load(symbolFile.toPath(), executor));
}
}
return packageToTable;
}
public static ResourceSymbols from(FieldInitializers fieldInitializers) {
return new ResourceSymbols(fieldInitializers);
}
public static ResourceSymbols merge(Collection<ResourceSymbols> symbolTables) {
List<FieldInitializers> fieldInitializers = new ArrayList<>(symbolTables.size());
for (ResourceSymbols symbolTableProvider : symbolTables) {
fieldInitializers.add(symbolTableProvider.asInitializers());
}
return from(FieldInitializers.mergedFrom(fieldInitializers));
}
/** Read the symbols from the provided symbol file. */
public static ListenableFuture<ResourceSymbols> load(
Path primaryRTxt, ListeningExecutorService executorService) {
return executorService.submit(new SymbolLoadingTask(primaryRTxt));
}
private final FieldInitializers values;
private ResourceSymbols(FieldInitializers fieldInitializers) {
this.values = fieldInitializers;
}
/**
* Writes the java sources for a given package.
*
* @param sourceOut The directory to write the java package structures and sources to.
* @param packageName The name of the package to write.
* @param packageSymbols The symbols defined in the given package.
* @param finalFields
* @throws IOException when encountering an error during writing.
*/
public void writeSourcesTo(
Path sourceOut,
String packageName,
Collection<ResourceSymbols> packageSymbols,
boolean finalFields)
throws IOException {
RSourceGenerator.with(sourceOut, asInitializers(), finalFields)
.write(packageName, merge(packageSymbols).asInitializers());
}
public FieldInitializers asInitializers() {
return values;
}
public void writeClassesTo(
Multimap<String, ResourceSymbols> libMap,
String appPackageName,
Path classesOut,
boolean finalFields)
throws IOException {
RClassGenerator classWriter = RClassGenerator.with(classesOut, values, finalFields);
for (String packageName : libMap.keySet()) {
classWriter.write(packageName, ResourceSymbols.merge(libMap.get(packageName)).values);
}
if (appPackageName != null) {
// Unlike the R.java generation, we also write the app's R.class file so that the class
// jar file can be complete (aapt doesn't generate it for us).
classWriter.write(appPackageName);
}
}
}
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