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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.collect.ImmutableCollection;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.config.ConfigMatchingProvider;
import com.google.devtools.build.lib.analysis.config.RunUnder;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.ClassObjectConstructor;
import com.google.devtools.build.lib.packages.OutputFile;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.SkylarkClassObject;
import com.google.devtools.build.lib.util.Preconditions;
import javax.annotation.Nullable;
/**
* A {@link ConfiguredTarget} that is produced by a rule.
*
* <p>Created by {@link RuleConfiguredTargetBuilder}. There is an instance of this class for every
* analyzed rule. For more information about how analysis works, see {@link
* com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory}.
*/
public final class RuleConfiguredTarget extends AbstractConfiguredTarget {
/**
* The configuration transition for an attribute through which a prerequisite
* is requested.
*/
public enum Mode {
TARGET,
HOST,
DATA,
SPLIT,
DONT_CHECK
}
private final TransitiveInfoProviderMap providers;
private final ImmutableMap<Label, ConfigMatchingProvider> configConditions;
RuleConfiguredTarget(
RuleContext ruleContext,
TransitiveInfoProviderMap providers,
SkylarkProviders skylarkProviders1) {
super(ruleContext);
// We don't use ImmutableMap.Builder here to allow augmenting the initial list of 'default'
// providers by passing them in.
TransitiveInfoProviderMap.Builder providerBuilder = providers.toBuilder();
Preconditions.checkState(providerBuilder.contains(RunfilesProvider.class));
Preconditions.checkState(providerBuilder.contains(FileProvider.class));
Preconditions.checkState(providerBuilder.contains(FilesToRunProvider.class));
// Initialize every SkylarkApiProvider
skylarkProviders1.init(this);
providerBuilder.add(skylarkProviders1);
this.providers = providerBuilder.build();
this.configConditions = ruleContext.getConfigConditions();
// If this rule is the run_under target, then check that we have an executable; note that
// run_under is only set in the target configuration, and the target must also be analyzed for
// the target configuration.
RunUnder runUnder = getConfiguration().getRunUnder();
if (runUnder != null && getLabel().equals(runUnder.getLabel())) {
if (getProvider(FilesToRunProvider.class).getExecutable() == null) {
ruleContext.ruleError("run_under target " + runUnder.getLabel() + " is not executable");
}
}
// Make sure that all declared output files are also created as artifacts. The
// CachingAnalysisEnvironment makes sure that they all have generating actions.
if (!ruleContext.hasErrors()) {
for (OutputFile out : ruleContext.getRule().getOutputFiles()) {
ruleContext.createOutputArtifact(out);
}
}
}
/**
* The configuration conditions that trigger this rule's configurable attributes.
*/
ImmutableMap<Label, ConfigMatchingProvider> getConfigConditions() {
return configConditions;
}
@Nullable
@Override
public <P extends TransitiveInfoProvider> P getProvider(Class<P> providerClass) {
// TODO(bazel-team): Should aspects be allowed to override providers on the configured target
// class?
return providers.getProvider(providerClass);
}
/**
* Returns a value provided by this target. Only meant to use from Skylark.
*/
@Override
public Object get(String providerKey) {
return getProvider(SkylarkProviders.class).getValue(providerKey);
}
/**
* Returns a declared provider provided by this target. Only meant to use from Skylark.
*/
@Override
public SkylarkClassObject get(ClassObjectConstructor.Key providerKey) {
return getProvider(SkylarkProviders.class).getDeclaredProvider(providerKey);
}
@Override
public final Rule getTarget() {
return (Rule) super.getTarget();
}
@Override
public String errorMessage(String name) {
return String.format("target (rule class of '%s') doesn't have provider '%s'.",
getTarget().getRuleClass(), name);
}
@Override
public ImmutableCollection<String> getKeys() {
return ImmutableList.<String>builder().addAll(super.getKeys())
.addAll(getProvider(SkylarkProviders.class).getKeys()).build();
}
}
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