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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.analysis.config.BuildConfiguration;
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.concurrent.ThreadSafety.Immutable;
import com.google.devtools.build.lib.packages.License;
import com.google.devtools.build.lib.packages.Rule;
/**
* A {@link ConfiguredTarget} that has licensed targets in its transitive closure.
*/
@Immutable
public final class LicensesProviderImpl implements LicensesProvider {
public static final LicensesProvider EMPTY =
new LicensesProviderImpl(NestedSetBuilder.<TargetLicense>emptySet(Order.LINK_ORDER));
private final NestedSet<TargetLicense> transitiveLicenses;
public LicensesProviderImpl(NestedSet<TargetLicense> transitiveLicenses) {
this.transitiveLicenses = transitiveLicenses;
}
/**
* Create the appropriate {@link LicensesProvider} for a rule based on its {@code RuleContext}
*/
public static LicensesProvider of(RuleContext ruleContext) {
if (!ruleContext.getConfiguration().checkLicenses()) {
return EMPTY;
}
NestedSetBuilder<TargetLicense> builder = NestedSetBuilder.linkOrder();
BuildConfiguration configuration = ruleContext.getConfiguration();
Rule rule = ruleContext.getRule();
License toolOutputLicense = rule.getToolOutputLicense(ruleContext.attributes());
if (configuration.isHostConfiguration() && toolOutputLicense != null) {
if (toolOutputLicense != License.NO_LICENSE) {
builder.add(new TargetLicense(rule.getLabel(), toolOutputLicense));
}
} else {
if (rule.getLicense() != License.NO_LICENSE) {
builder.add(new TargetLicense(rule.getLabel(), rule.getLicense()));
}
for (TransitiveInfoCollection dep : ruleContext.getConfiguredTargetMap().values()) {
LicensesProvider provider = dep.getProvider(LicensesProvider.class);
if (provider != null) {
builder.addTransitive(provider.getTransitiveLicenses());
}
}
}
return new LicensesProviderImpl(builder.build());
}
@Override
public NestedSet<TargetLicense> getTransitiveLicenses() {
return transitiveLicenses;
}
}
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