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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.analysis;
import com.google.common.base.Objects;
import com.google.common.collect.Iterables;
import com.google.common.collect.ListMultimap;
import com.google.common.collect.Multimaps;
import com.google.devtools.build.lib.actions.ActionKeyContext;
import com.google.devtools.build.lib.analysis.config.BuildConfigurationValue;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.packages.PackageSpecification.PackageGroupContents;
import com.google.devtools.build.lib.packages.Target;
import com.google.devtools.build.lib.skyframe.BuildConfigurationKey;
import com.google.devtools.build.lib.skyframe.ConfiguredTargetAndData;
import java.util.List;
import java.util.Optional;
import java.util.Set;
import javax.annotation.Nullable;
/**
* A helper class for building {@link ConfiguredTarget} instances, in particular for non-rule ones.
* For {@link com.google.devtools.build.lib.analysis.configuredtargets.RuleConfiguredTarget}
* instances, use {@link RuleContext} instead, which is a subclass of this class.
*
* <p>The class is intended to be sub-classed by RuleContext, in order to share the code. However,
* it's not intended for sub-classing beyond that, and the constructor is intentionally package
* private to enforce that.
*/
public class TargetContext {
private final AnalysisEnvironment env;
private final Target target;
private final BuildConfigurationValue configuration;
/**
* This only contains prerequisites that are not declared in rule attributes, with the exception
* of visibility (i.e., visibility is represented here, even though it is a rule attribute in case
* of a rule). Rule attributes are handled by the {@link RuleContext} subclass.
*/
private final ListMultimap<Label, ConfiguredTargetAndData> directPrerequisites;
private final NestedSet<PackageGroupContents> visibility;
/**
* The constructor is intentionally package private.
*
* <p>directPrerequisites is expected to be ordered.
*/
TargetContext(
AnalysisEnvironment env,
Target target,
BuildConfigurationValue configuration,
Set<ConfiguredTargetAndData> directPrerequisites,
NestedSet<PackageGroupContents> visibility) {
this.env = env;
this.target = target;
this.configuration = configuration;
this.directPrerequisites =
Multimaps.index(directPrerequisites, prereq -> prereq.getTarget().getLabel());
this.visibility = visibility;
}
public AnalysisEnvironment getAnalysisEnvironment() {
return env;
}
public ActionKeyContext getActionKeyContext() {
return env.getActionKeyContext();
}
public Target getTarget() {
return target;
}
public Label getLabel() {
return target.getLabel();
}
/**
* Returns the configuration for this target. This may return null if the target is supposed to be
* configuration-independent (like an input file, or a visibility rule). However, this is
* guaranteed to be non-null for rules and for output files.
*/
@Nullable
public BuildConfigurationValue getConfiguration() {
return configuration;
}
public BuildConfigurationKey getConfigurationKey() {
return configuration.getKey();
}
public NestedSet<PackageGroupContents> getVisibility() {
return visibility;
}
/**
* Returns the prerequisite with the given label and configuration, or null if no such
* prerequisite exists. If configuration is absent, return the first prerequisite with the given
* label.
*/
@Nullable
public TransitiveInfoCollection findDirectPrerequisite(
Label label, Optional<BuildConfigurationValue> config) {
if (directPrerequisites.containsKey(label)) {
List<ConfiguredTargetAndData> prerequisites = directPrerequisites.get(label);
// If the config is present, find the prereq with that configuration. Otherwise, return the
// first.
if (!config.isPresent()) {
if (prerequisites.isEmpty()) {
return null;
}
return Iterables.getFirst(prerequisites, null).getConfiguredTarget();
}
for (ConfiguredTargetAndData prerequisite : prerequisites) {
if (Objects.equal(prerequisite.getConfiguration(), config.get())) {
return prerequisite.getConfiguredTarget();
}
}
}
return null;
}
}