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// Copyright 2015 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.base.Preconditions;
import com.google.common.collect.Maps;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.cmdline.ResolvedTargets;
import com.google.devtools.build.lib.cmdline.TargetParsingException;
import com.google.devtools.build.lib.packages.NoSuchTargetException;
import com.google.devtools.build.lib.packages.Package;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.skyframe.WalkableGraph;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
/**
* This class encapsulates logic behind computing final target set based on separate results from a
* list of target patterns (eg, //foo:all -//bar/... //foo:test).
*/
abstract class TargetPatternsResultBuilder {
private Map<PackageIdentifier, Package> packages = null;
private boolean hasError = false;
/**
* Sets that there was an error, during evaluation.
*/
public void setError() {
hasError = true;
}
/** Returns final set of targets and sets error flag if required. */
public ResolvedTargets<Target> build(WalkableGraph walkableGraph)
throws TargetParsingException, InterruptedException {
precomputePackages(walkableGraph);
ResolvedTargets.Builder<Target> resolvedTargetsBuilder = buildInternal();
if (hasError) {
resolvedTargetsBuilder.setError();
}
return resolvedTargetsBuilder.build();
}
/**
* Transforms {@code ResolvedTargets<Label>} to {@code ResolvedTargets<Target>}. Note that this
* method is using information about packages, so {@link #precomputePackages} has to be called
* before this method.
*/
protected ResolvedTargets.Builder<Target> transformLabelsIntoTargets(
ResolvedTargets<Label> resolvedLabels) {
// precomputePackages has to be called before this method.
ResolvedTargets.Builder<Target> resolvedTargetsBuilder = ResolvedTargets.builder();
Preconditions.checkNotNull(packages);
for (Label label : resolvedLabels.getTargets()) {
resolvedTargetsBuilder.add(getExistingTarget(label));
}
for (Label label : resolvedLabels.getFilteredTargets()) {
resolvedTargetsBuilder.remove(getExistingTarget(label));
}
return resolvedTargetsBuilder;
}
private void precomputePackages(WalkableGraph walkableGraph) throws InterruptedException {
Set<PackageIdentifier> packagesToRequest = getPackagesIdentifiers();
packages = Maps.newHashMapWithExpectedSize(packagesToRequest.size());
for (PackageIdentifier pkgIdentifier : packagesToRequest) {
packages.put(pkgIdentifier, findPackageInGraph(pkgIdentifier, walkableGraph));
}
}
private Target getExistingTarget(Label label) {
Package pkg = Preconditions.checkNotNull(packages.get(label.getPackageIdentifier()), label);
try {
return pkg.getTarget(label.getName());
} catch (NoSuchTargetException e) {
// This exception should not raise, because we are processing it during TargetPatternValues
// evaluation in SkyframeTargetPatternEvaluator#parseTargetPatternKeys and values with errors
// are not added to final result.
throw new IllegalStateException(e);
}
}
private Set<PackageIdentifier> getPackagesIdentifiers() {
Set<PackageIdentifier> packagesIdentifiers = new HashSet<>();
for (Label label : getLabels()) {
packagesIdentifiers.add(label.getPackageIdentifier());
}
return packagesIdentifiers;
}
private static Package findPackageInGraph(
PackageIdentifier pkgIdentifier, WalkableGraph walkableGraph) throws InterruptedException {
return Preconditions.checkNotNull(
((PackageValue) walkableGraph.getValue(PackageValue.key(pkgIdentifier))), pkgIdentifier)
.getPackage();
}
/**
* Adds the result from expansion of positive target pattern (eg, "//foo:all").
*/
abstract void addLabelsOfNegativePattern(ResolvedTargets<Label> labels);
/**
* Adds the result from expansion of negative target pattern (eg, "-//foo:all").
*/
abstract void addLabelsOfPositivePattern(ResolvedTargets<Label> labels);
/**
* Returns {@code ResolvedTargets.Builder<Target>} with final set of targets. Note that this
* method doesn't set error flag in result.
*/
abstract ResolvedTargets.Builder<Target> buildInternal() throws TargetParsingException;
/**
* Returns target labels from all individual results.
*/
protected abstract Iterable<Label> getLabels();
}
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