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// Copyright 2015 Google Inc. 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.cmdline.Label;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.cmdline.PackageIdentifier.RepositoryName;
import com.google.devtools.build.lib.cmdline.ResolvedTargets;
import com.google.devtools.build.lib.cmdline.TargetParsingException;
import com.google.devtools.build.lib.cmdline.TargetPatternResolver;
import com.google.devtools.build.lib.events.Event;
import com.google.devtools.build.lib.events.EventHandler;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.NoSuchThingException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.pkgcache.FilteringPolicies;
import com.google.devtools.build.lib.pkgcache.FilteringPolicy;
import com.google.devtools.build.lib.pkgcache.PathPackageLocator;
import com.google.devtools.build.lib.pkgcache.RecursivePackageProvider;
import com.google.devtools.build.lib.pkgcache.TargetPatternResolverUtil;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.lib.vfs.PathFragment;
import com.google.devtools.build.lib.vfs.RootedPath;
/**
* A {@link TargetPatternResolver} backed by a {@link RecursivePackageProvider}.
*/
public class RecursivePackageProviderBackedTargetPatternResolver
implements TargetPatternResolver<Target> {
private final RecursivePackageProvider recursivePackageProvider;
private final EventHandler eventHandler;
private final FilteringPolicy policy;
private final PathPackageLocator pkgPath;
public RecursivePackageProviderBackedTargetPatternResolver(
RecursivePackageProvider recursivePackageProvider,
EventHandler eventHandler,
FilteringPolicy policy,
PathPackageLocator pkgPath) {
this.recursivePackageProvider = recursivePackageProvider;
this.eventHandler = eventHandler;
this.policy = policy;
this.pkgPath = pkgPath;
}
@Override
public void warn(String msg) {
eventHandler.handle(Event.warn(msg));
}
/**
* Gets a {@link Package} from the {@link RecursivePackageProvider}. May return a {@link Package}
* that has errors.
*/
private Package getPackage(PackageIdentifier pkgIdentifier)
throws NoSuchPackageException, InterruptedException {
return recursivePackageProvider.getPackage(eventHandler, pkgIdentifier);
}
@Override
public Target getTargetOrNull(Label label) throws InterruptedException {
try {
if (!isPackage(label.getPackageIdentifier())) {
return null;
}
return recursivePackageProvider.getTarget(eventHandler, label);
} catch (NoSuchThingException e) {
return null;
}
}
@Override
public ResolvedTargets<Target> getExplicitTarget(Label label)
throws TargetParsingException, InterruptedException {
try {
Target target = recursivePackageProvider.getTarget(eventHandler, label);
return policy.shouldRetain(target, true)
? ResolvedTargets.of(target)
: ResolvedTargets.<Target>empty();
} catch (NoSuchThingException e) {
throw new TargetParsingException(e.getMessage(), e);
}
}
@Override
public ResolvedTargets<Target> getTargetsInPackage(
String originalPattern, PackageIdentifier packageIdentifier, boolean rulesOnly)
throws TargetParsingException, InterruptedException {
FilteringPolicy actualPolicy = rulesOnly
? FilteringPolicies.and(FilteringPolicies.RULES_ONLY, policy)
: policy;
return getTargetsInPackage(originalPattern, packageIdentifier, actualPolicy);
}
private ResolvedTargets<Target> getTargetsInPackage(String originalPattern,
PackageIdentifier packageIdentifier, FilteringPolicy policy)
throws TargetParsingException, InterruptedException {
try {
Package pkg = getPackage(packageIdentifier);
return TargetPatternResolverUtil.resolvePackageTargets(pkg, policy);
} catch (NoSuchThingException e) {
String message = TargetPatternResolverUtil.getParsingErrorMessage(
e.getMessage(), originalPattern);
throw new TargetParsingException(message, e);
}
}
@Override
public boolean isPackage(PackageIdentifier packageIdentifier) {
return recursivePackageProvider.isPackage(eventHandler, packageIdentifier);
}
@Override
public String getTargetKind(Target target) {
return target.getTargetKind();
}
@Override
public ResolvedTargets<Target> findTargetsBeneathDirectory(RepositoryName repository,
String originalPattern, String directory, boolean rulesOnly,
ImmutableSet<String> excludedSubdirectories)
throws TargetParsingException, InterruptedException {
FilteringPolicy actualPolicy = rulesOnly
? FilteringPolicies.and(FilteringPolicies.RULES_ONLY, policy)
: policy;
ImmutableSet<PathFragment> excludedPathFragments =
TargetPatternResolverUtil.getPathFragments(excludedSubdirectories);
PathFragment pathFragment = TargetPatternResolverUtil.getPathFragment(directory);
ResolvedTargets.Builder<Target> targetBuilder = ResolvedTargets.builder();
// TODO(bazel-team): This is where we need to depend on the RepositoryValue of a remote
// repository in order figure out its root and thus support recursive package search in them.
for (Path root : pkgPath.getPathEntries()) {
RootedPath rootedPath = RootedPath.toRootedPath(root, pathFragment);
Iterable<PathFragment> packagesUnderDirectory =
recursivePackageProvider.getPackagesUnderDirectory(
repository, rootedPath, excludedPathFragments);
for (PathFragment pkg : packagesUnderDirectory) {
targetBuilder.merge(getTargetsInPackage(originalPattern,
PackageIdentifier.createInDefaultRepo(pkg),
FilteringPolicies.NO_FILTER));
}
}
// Perform the no-targets-found check before applying the filtering policy so we only return the
// error if the input directory's subtree really contains no targets.
if (targetBuilder.isEmpty()) {
throw new TargetParsingException("no targets found beneath '" + pathFragment + "'");
}
ResolvedTargets<Target> prefilteredTargets = targetBuilder.build();
ResolvedTargets.Builder<Target> filteredBuilder = ResolvedTargets.builder();
if (prefilteredTargets.hasError()) {
filteredBuilder.setError();
}
for (Target target : prefilteredTargets.getTargets()) {
if (actualPolicy.shouldRetain(target, false)) {
filteredBuilder.add(target);
}
}
return filteredBuilder.build();
}
}
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