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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.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.configuredtargets.InputFileConfiguredTarget;
import com.google.devtools.build.lib.analysis.configuredtargets.PackageGroupConfiguredTarget;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.collect.nestedset.Order;
import com.google.devtools.build.lib.packages.RequiredProviders;
import com.google.devtools.build.lib.skyframe.BuildConfigurationValue;
import com.google.devtools.build.lib.skylarkbuildapi.TransitiveInfoCollectionApi;
import com.google.devtools.build.lib.syntax.SkylarkIndexable;
import com.google.devtools.build.lib.syntax.SkylarkNestedSet;
import javax.annotation.Nullable;
/**
* Multiple {@link TransitiveInfoProvider}s bundled together.
*
* <p>Represents the information made available by a {@link ConfiguredTarget} to other ones that
* depend on it. For more information about the analysis phase, see {@link
* com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory}.
*
* <p>Implementations of build rules should <b>not</b> hold on to references to the {@link
* TransitiveInfoCollection}s representing their direct prerequisites in order to reduce their
* memory footprint (otherwise, the referenced object could refer one of its direct dependencies in
* turn, thereby making the size of the objects reachable from a single instance unbounded).
*
* @see com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory
* @see TransitiveInfoProvider
*/
public interface TransitiveInfoCollection
extends SkylarkIndexable, SkylarkProviderCollection, TransitiveInfoCollectionApi {
@Override
default SkylarkNestedSet outputGroup(String group) {
OutputGroupInfo provider = OutputGroupInfo.get(this);
NestedSet<Artifact> result = provider != null
? provider.getOutputGroup(group)
: NestedSetBuilder.<Artifact>emptySet(Order.STABLE_ORDER);
return SkylarkNestedSet.of(Artifact.class, result);
}
/**
* Returns the transitive information provider requested, or null if the provider is not found.
* The provider has to be a TransitiveInfoProvider Java class.
*/
@Nullable <P extends TransitiveInfoProvider> P getProvider(Class<P> provider);
/**
* Returns the label associated with this prerequisite.
*/
Label getLabel();
/**
* Returns the {@link BuildConfigurationValue.Key} naming the {@link BuildConfiguration} for which
* this transitive info collection is defined. Configuration is defined for all configured targets
* with exception of {@link InputFileConfiguredTarget} and {@link PackageGroupConfiguredTarget}
* for which it is always <b>null</b>.
*/
@Nullable
BuildConfigurationValue.Key getConfigurationKey();
/**
* Checks whether this {@link TransitiveInfoCollection} satisfies given {@link RequiredProviders}.
*/
default boolean satisfies(RequiredProviders providers) {
return providers.isSatisfiedBy(
aClass -> getProvider(aClass.asSubclass(TransitiveInfoProvider.class)) != null,
id -> this.get(id) != null);
}
/**
* Returns providers that this {@link TransitiveInfoCollection} misses from a given {@link
* RequiredProviders}.
*
* <p>If none are missing, returns {@link RequiredProviders} that accept any set of providers.
*/
default RequiredProviders missingProviders(RequiredProviders providers) {
return providers.getMissing(
aClass -> getProvider(aClass.asSubclass(TransitiveInfoProvider.class)) != null,
id -> this.get(id) != null);
}
}
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