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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.base.Verify;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
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;
import com.google.devtools.build.lib.packages.Target;
import java.util.List;
import javax.annotation.Nullable;
/**
* A helper class for building {@link ConfiguredTarget} instances, in particular for non-rule ones.
* For {@link 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 BuildConfiguration configuration;
/**
* This list 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 List<ConfiguredTarget> directPrerequisites;
private final NestedSet<PackageSpecification> visibility;
/**
* The constructor is intentionally package private.
*
* <p>directPrerequisites is expected to be ordered.
*/
TargetContext(AnalysisEnvironment env, Target target, BuildConfiguration configuration,
Iterable<ConfiguredTarget> directPrerequisites,
NestedSet<PackageSpecification> visibility) {
this.env = env;
this.target = target;
this.configuration = configuration;
this.directPrerequisites = ImmutableList.<ConfiguredTarget>copyOf(directPrerequisites);
this.visibility = visibility;
}
public AnalysisEnvironment getAnalysisEnvironment() {
return env;
}
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 BuildConfiguration getConfiguration() {
return configuration;
}
public NestedSet<PackageSpecification> getVisibility() {
return visibility;
}
/**
* Returns the prerequisite with the given label and configuration. Throws a RuntimeException if
* no such prerequisite exists.
*/
TransitiveInfoCollection findDirectPrerequisite(Label label, BuildConfiguration config) {
return Verify.verifyNotNull(maybeFindDirectPrerequisite(label, config),
"Could not find prerequisite %s in the expected configuration", label);
}
/**
* Returns the prerequisite with the given label and configuration, or null if no such
* prerequisite exists.
*/
TransitiveInfoCollection maybeFindDirectPrerequisite(Label label, BuildConfiguration config) {
for (ConfiguredTarget prerequisite : directPrerequisites) {
if (prerequisite.getLabel().equals(label)
&& (Objects.equal(prerequisite.getConfiguration(), config))) {
return prerequisite;
}
}
return null;
}
}
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