// Copyright 2017 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.rules.platform;
import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.FileProvider;
import com.google.devtools.build.lib.analysis.FilesToRunProvider;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.analysis.RunfilesProvider;
import com.google.devtools.build.lib.analysis.TransitiveInfoCollection;
import com.google.devtools.build.lib.analysis.platform.ConstraintSettingInfo;
import com.google.devtools.build.lib.analysis.platform.ConstraintValueInfo;
import com.google.devtools.build.lib.rules.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.util.Preconditions;
/** Defines a potential value of a constraint. */
public class ConstraintValue implements RuleConfiguredTargetFactory {
@Override
public ConfiguredTarget create(RuleContext ruleContext)
throws InterruptedException, RuleErrorException {
ConstraintSettingInfo constraint =
ConstraintSetting.constraintSetting(
ruleContext.getPrerequisite(
ConstraintValueRule.CONSTRAINT_SETTING_ATTR, Mode.DONT_CHECK));
return new RuleConfiguredTargetBuilder(ruleContext)
.addProvider(RunfilesProvider.class, RunfilesProvider.EMPTY)
.addProvider(FileProvider.class, FileProvider.EMPTY)
.addProvider(FilesToRunProvider.class, FilesToRunProvider.EMPTY)
.addNativeDeclaredProvider(ConstraintValueInfo.create(constraint, ruleContext.getLabel()))
.build();
}
/** Retrieves and casts the provider from the given target. */
public static ConstraintValueInfo constraintValue(TransitiveInfoCollection target) {
Object provider = target.get(ConstraintValueInfo.SKYLARK_IDENTIFIER);
if (provider == null) {
return null;
}
Preconditions.checkState(provider instanceof ConstraintValueInfo);
return (ConstraintValueInfo) provider;
}
/** Retrieves and casts the providers from the given targets. */
public static Iterable<ConstraintValueInfo> constraintValues(
Iterable<? extends TransitiveInfoCollection> targets) {
return Iterables.transform(
targets,
new Function<TransitiveInfoCollection, ConstraintValueInfo>() {
@Override
public ConstraintValueInfo apply(TransitiveInfoCollection target) {
return constraintValue(target);
}
});
}
}