blob: db21b81fcd1e0c63433da0e78635f7f4b90b81be [file] [log] [blame]
// 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.lib.skyframe;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.actions.PackageRoots;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.vfs.Root;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
/**
* A {@link PackageRoots} backed by a map of package identifiers to paths. A symlink forest must be
* planted for execution.
*/
public class MapAsPackageRoots implements PackageRoots {
private final ImmutableMap<PackageIdentifier, Root> packageRootsMap;
MapAsPackageRoots(ImmutableMap<PackageIdentifier, Root> packageRootsMap) {
this.packageRootsMap = packageRootsMap;
}
@Override
public Optional<ImmutableMap<PackageIdentifier, Root>> getPackageRootsMap() {
return Optional.of(packageRootsMap);
}
@Override
public PackageRootLookup getPackageRootLookup() {
Map<Root, Root> deduper = new HashMap<>();
Map<PackageIdentifier, Root> realPackageRoots = new HashMap<>();
for (Map.Entry<PackageIdentifier, Root> entry : packageRootsMap.entrySet()) {
Root newRoot = entry.getValue();
Root oldRoot = deduper.putIfAbsent(newRoot, newRoot);
realPackageRoots.put(entry.getKey(), oldRoot == null ? newRoot : oldRoot);
}
if (deduper.size() == 1) {
// This will return a root more often than in the multi-root case, which only returns a root
// for an exact match, but there are no negative consequences to being *more* informed about
// a file's potential root.
Root onlyRoot = Iterables.getOnlyElement(deduper.keySet());
return k -> onlyRoot;
}
return realPackageRoots::get;
}
}