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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.ListMultimap;
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.Attribute;
import com.google.devtools.build.lib.packages.AttributeMap;
import com.google.devtools.build.lib.packages.License;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
/** A {@link ConfiguredTarget} that has licensed targets in its transitive closure. */
@Immutable
@AutoCodec
public final class LicensesProviderImpl implements LicensesProvider {
public static final LicensesProvider EMPTY =
new LicensesProviderImpl(NestedSetBuilder.<TargetLicense>emptySet(Order.LINK_ORDER), null);
private final NestedSet<TargetLicense> transitiveLicenses;
private final TargetLicense outputLicenses;
public LicensesProviderImpl(
NestedSet<TargetLicense> transitiveLicenses, TargetLicense outputLicenses) {
this.transitiveLicenses = transitiveLicenses;
this.outputLicenses = outputLicenses;
}
/**
* 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();
AttributeMap attributes = ruleContext.attributes();
License toolOutputLicense = rule.getToolOutputLicense(attributes);
TargetLicense outputLicenses =
toolOutputLicense == null ? null : new TargetLicense(rule.getLabel(), toolOutputLicense);
if (configuration.isHostConfiguration() && toolOutputLicense != null) {
if (toolOutputLicense != License.NO_LICENSE) {
builder.add(outputLicenses);
}
} else {
if (rule.getLicense() != License.NO_LICENSE) {
builder.add(new TargetLicense(rule.getLabel(), rule.getLicense()));
}
ListMultimap<String, ? extends TransitiveInfoCollection> configuredMap =
ruleContext.getConfiguredTargetMap();
for (String depAttrName : attributes.getAttributeNames()) {
// Only add the transitive licenses for the attributes that do not have the output_licenses.
Attribute attribute = attributes.getAttributeDefinition(depAttrName);
for (TransitiveInfoCollection dep : configuredMap.get(depAttrName)) {
LicensesProvider provider = dep.getProvider(LicensesProvider.class);
if (provider == null) {
continue;
}
if (useOutputLicenses(attribute, configuration) && provider.hasOutputLicenses()) {
builder.add(provider.getOutputLicenses());
} else {
builder.addTransitive(provider.getTransitiveLicenses());
}
}
}
}
return new LicensesProviderImpl(builder.build(), outputLicenses);
}
private static boolean useOutputLicenses(Attribute attribute, BuildConfiguration configuration) {
return configuration.isHostConfiguration() || attribute.useOutputLicenses();
}
@Override
public NestedSet<TargetLicense> getTransitiveLicenses() {
return transitiveLicenses;
}
@Override
public TargetLicense getOutputLicenses() {
return outputLicenses;
}
@Override
public boolean hasOutputLicenses() {
return outputLicenses != null;
}
}
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