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// Copyright 2014 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.lib.skyframe;
import com.google.common.collect.ImmutableSet;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.cmdline.RepositoryName;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.RootedPath;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.util.Map;
import javax.annotation.Nullable;
/**
* RecursivePkgFunction builds up the set of packages underneath a given directory
* transitively.
*
* <p>Example: foo/BUILD, foo/sub/x, foo/subpkg/BUILD would yield transitive packages "foo" and
* "foo/subpkg".
*/
public class RecursivePkgFunction implements SkyFunction {
private final BlazeDirectories directories;
public RecursivePkgFunction(BlazeDirectories directories) {
this.directories = directories;
}
/** N.B.: May silently throw {@link NoSuchPackageException} in nokeep_going mode! */
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws InterruptedException {
return new MyTraversalFunction().visitDirectory((RecursivePkgKey) skyKey.argument(), env);
}
private class MyTraversalFunction
extends RecursiveDirectoryTraversalFunction<MyPackageDirectoryConsumer, RecursivePkgValue> {
private MyTraversalFunction() {
super(directories);
}
@Override
protected MyPackageDirectoryConsumer getInitialConsumer() {
return new MyPackageDirectoryConsumer();
}
@Override
protected SkyKey getSkyKeyForSubdirectory(RepositoryName repository, RootedPath subdirectory,
ImmutableSet<PathFragment> excludedSubdirectoriesBeneathSubdirectory) {
return RecursivePkgValue.key(
repository, subdirectory, excludedSubdirectoriesBeneathSubdirectory);
}
@Override
protected RecursivePkgValue aggregateWithSubdirectorySkyValues(
MyPackageDirectoryConsumer consumer, Map<SkyKey, SkyValue> subdirectorySkyValues) {
// Aggregate the transitive subpackages.
for (SkyValue childValue : subdirectorySkyValues.values()) {
consumer.addTransitivePackages(((RecursivePkgValue) childValue).getPackages());
}
return consumer.createRecursivePkgValue();
}
}
private static class MyPackageDirectoryConsumer
implements RecursiveDirectoryTraversalFunction.PackageDirectoryConsumer {
private final NestedSetBuilder<String> packages = new NestedSetBuilder<>(Order.STABLE_ORDER);
@Override
public void notePackage(PathFragment pkgPath) {
packages.add(pkgPath.getPathString());
}
@Override
public void notePackageError(String noSuchPackageExceptionErrorMessage) {
// Nothing to do because the RecursiveDirectoryTraversalFunction has already emitted an error
// event.
}
void addTransitivePackages(NestedSet<String> transitivePackages) {
packages.addTransitive(transitivePackages);
}
RecursivePkgValue createRecursivePkgValue() {
return RecursivePkgValue.create(packages);
}
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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