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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 static java.nio.charset.StandardCharsets.UTF_8;
import com.android.SdkConstants;
import com.android.resources.ResourceType;
import com.google.common.collect.Iterables;
import java.io.BufferedWriter;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Map;
/** Writes out an R.java source. */
public class RSourceGenerator {
public static RSourceGenerator with(
Path outputBasePath, FieldInitializers initializers, boolean finalFields) {
return new RSourceGenerator(outputBasePath, initializers, finalFields);
}
private final Path outputBasePath;
private final FieldInitializers values;
private final boolean finalFields;
private RSourceGenerator(
Path outputBasePath, FieldInitializers initializers, boolean finalFields) {
this.outputBasePath = outputBasePath;
this.values = initializers;
this.finalFields = finalFields;
}
/** Writes the java source with the writer values to the specified package and derived dir. */
public void write(String packageName) throws IOException {
writeSource(packageName, values);
}
/**
* Writes the java source with the passed subset of the writer values.
*
* @param packageName The package and the dir to write the R java source to under the output path.
* @param symbolsToWrite A map of ResourceType to resource name that will be written. If the map
* specifies a resource that does not exist in the writer values, it will be ignored.
*/
public void write(String packageName, FieldInitializers symbolsToWrite) throws IOException {
writeSource(packageName, values.filter(symbolsToWrite));
}
private void writeSource(
String packageName,
Iterable<Map.Entry<ResourceType, Map<String, FieldInitializer>>> initializersToWrite)
throws IOException {
String packageDir = packageName.replace('.', '/');
Path packagePath = outputBasePath.resolve(packageDir);
Path rJavaPath = packagePath.resolve(SdkConstants.FN_RESOURCE_CLASS);
Files.createDirectories(rJavaPath.getParent());
if (Iterables.isEmpty(initializersToWrite)) {
return;
}
try (BufferedWriter writer = Files.newBufferedWriter(rJavaPath, UTF_8)) {
writer.write("/* AUTO-GENERATED FILE. DO NOT MODIFY.\n");
writer.write(" *\n");
writer.write(" * This class was automatically generated by the\n");
writer.write(" * bazel tool from the resource data it found. It\n");
writer.write(" * should not be modified by hand.\n");
writer.write(" */\n");
writer.write(String.format("package %s;\n", packageName));
writer.write("public final class R {\n");
for (Map.Entry<ResourceType, Map<String, FieldInitializer>> entry : initializersToWrite) {
writer.write(
String.format(" public static final class %s {\n", entry.getKey().getName()));
for (Map.Entry<String, FieldInitializer> fieldEntry : entry.getValue().entrySet()) {
fieldEntry.getValue().writeInitSource(fieldEntry.getKey(), writer, finalFields);
}
writer.write(" }\n");
}
writer.write("}");
}
}
}
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