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// Copyright 2016 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.objc;
import static com.google.devtools.build.lib.packages.BuildType.LABEL_LIST;
import com.google.devtools.build.lib.analysis.ConfiguredAspect;
import com.google.devtools.build.lib.analysis.ConfiguredAspectFactory;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.PrerequisiteArtifacts;
import com.google.devtools.build.lib.analysis.RuleConfiguredTarget.Mode;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.packages.AspectDefinition;
import com.google.devtools.build.lib.packages.AspectParameters;
import com.google.devtools.build.lib.packages.NativeAspectClass;
import com.google.devtools.build.lib.rules.proto.ProtoSourcesProvider;
/**
* Aspect that gathers the proto dependencies of the attached rule target, and propagates the proto
* values of its dependencies through the ObjcProtoProvider.
*/
public class ObjcProtoAspect extends NativeAspectClass implements ConfiguredAspectFactory {
public static final String NAME = "ObjcProtoAspect";
@Override
public AspectDefinition getDefinition(AspectParameters aspectParameters) {
return new AspectDefinition.Builder(NAME)
.attributeAspect("deps", this)
.requiresConfigurationFragments(ObjcConfiguration.class)
.build();
}
@Override
public ConfiguredAspect create(
ConfiguredTarget base, RuleContext ruleContext, AspectParameters parameters)
throws InterruptedException {
ConfiguredAspect.Builder aspectBuilder = new ConfiguredAspect.Builder(NAME, ruleContext);
ObjcConfiguration objcConfiguration = ruleContext.getFragment(ObjcConfiguration.class);
if (!objcConfiguration.experimentalAutoTopLevelUnionObjCProtos()) {
// Only process the aspect if the experimental flag is set.
return aspectBuilder.build();
}
ObjcProtoProvider.Builder aspectObjcProtoProvider = new ObjcProtoProvider.Builder();
Iterable<ObjcProtoProvider> depObjcProtoProviders =
ruleContext.getPrerequisites("deps", Mode.TARGET, ObjcProtoProvider.class);
aspectObjcProtoProvider.addTransitive(depObjcProtoProviders);
// If the rule has the portable_proto_filters, it must be an objc_proto_library configured
// to use the third party protobuf library, in contrast with the PB2 internal library. Only
// the third party library is enabled to propagate the protos with this aspect.
if (ruleContext
.attributes()
.has(ObjcProtoLibraryRule.PORTABLE_PROTO_FILTERS_ATTR, LABEL_LIST)) {
aspectObjcProtoProvider.addPortableProtoFilters(
PrerequisiteArtifacts.nestedSet(
ruleContext, ObjcProtoLibraryRule.PORTABLE_PROTO_FILTERS_ATTR, Mode.HOST));
// Gather up all the dependency protos depended by this target.
Iterable<ProtoSourcesProvider> protoProviders =
ruleContext.getPrerequisites("deps", Mode.TARGET, ProtoSourcesProvider.class);
for (ProtoSourcesProvider protoProvider : protoProviders) {
aspectObjcProtoProvider.addProtoSources(protoProvider.getTransitiveProtoSources());
}
}
// Only add the provider if it has any values, otherwise skip it.
if (!aspectObjcProtoProvider.isEmpty()) {
aspectBuilder.addProvider(ObjcProtoProvider.class, aspectObjcProtoProvider.build());
}
return aspectBuilder.build();
}
}
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