| // 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.proto; |
| |
| import static com.google.devtools.build.lib.collect.nestedset.Order.STABLE_ORDER; |
| |
| import com.google.devtools.build.lib.actions.Artifact; |
| import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException; |
| import com.google.devtools.build.lib.analysis.ConfiguredTarget; |
| import com.google.devtools.build.lib.analysis.FilesToRunProvider; |
| import com.google.devtools.build.lib.analysis.RuleConfiguredTargetBuilder; |
| import com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory; |
| import com.google.devtools.build.lib.analysis.RuleContext; |
| import com.google.devtools.build.lib.analysis.Runfiles; |
| import com.google.devtools.build.lib.analysis.RunfilesProvider; |
| import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder; |
| import com.google.devtools.build.lib.packages.Type; |
| |
| /** Implements {code proto_lang_toolchain}. */ |
| public class ProtoLangToolchain implements RuleConfiguredTargetFactory { |
| @Override |
| public ConfiguredTarget create(RuleContext ruleContext) |
| throws InterruptedException, RuleErrorException, ActionConflictException { |
| NestedSetBuilder<ProtoSource> providedProtoSources = NestedSetBuilder.stableOrder(); |
| for (ProtoInfo protoInfo : |
| ruleContext.getPrerequisites("blacklisted_protos", ProtoInfo.PROVIDER)) { |
| providedProtoSources.addTransitive(protoInfo.getTransitiveSources()); |
| } |
| |
| return new RuleConfiguredTargetBuilder(ruleContext) |
| .addProvider( |
| ProtoLangToolchainProvider.create( |
| ruleContext.attributes().get("command_line", Type.STRING), |
| ruleContext.getPrerequisite("plugin", FilesToRunProvider.class), |
| ruleContext.getPrerequisite("runtime"), |
| // We intentionally flatten the NestedSet here. |
| // |
| // `providedProtoSources` are read during analysis, so flattening the set here once |
| // avoid flattening it in every `<lang>_proto_aspect` applied to `proto_library` |
| // targets. While this has the potential to use more memory than using a NestedSet, |
| // there are only a few `proto_lang_toolchain` targets in every build, so the impact |
| // on memory consumption should be neglectable. |
| providedProtoSources.build().toList())) |
| .setFilesToBuild(NestedSetBuilder.<Artifact>emptySet(STABLE_ORDER)) |
| .addProvider(RunfilesProvider.simple(Runfiles.EMPTY)) |
| .build(); |
| } |
| } |