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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 com.google.common.base.Preconditions;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.analysis.TransitiveInfoProvider;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
/**
* A provider that provides all protos and portable proto filters information in the transitive
* closure of its dependencies that are needed for generating and compiling only one version of
* proto files.
*/
public class ObjcProtoProvider implements TransitiveInfoProvider {
private final NestedSet<Artifact> protoSources;
private final NestedSet<Artifact> portableProtoFilters;
private ObjcProtoProvider(
NestedSet<Artifact> protoSources, NestedSet<Artifact> portableProtoFilters) {
this.protoSources = Preconditions.checkNotNull(protoSources);
this.portableProtoFilters = Preconditions.checkNotNull(portableProtoFilters);
}
/**
* Returns the set of all the protos that the dependencies of this provider has seen.
*/
public NestedSet<Artifact> getProtoSources() {
return protoSources;
}
/**
* Returns the set of all the associated filters to the collected protos.
*/
public NestedSet<Artifact> getPortableProtoFilters() {
return portableProtoFilters;
}
/**
* A builder for this context with an API that is optimized for collecting information from
* several transitive dependencies.
*/
public static final class Builder {
private final NestedSetBuilder<Artifact> protoSources = NestedSetBuilder.naiveLinkOrder();
private final NestedSetBuilder<Artifact> portableProtoFilters = NestedSetBuilder.linkOrder();
/**
* Adds all the protos to the set of dependencies.
*/
public Builder addProtoSources(NestedSet<Artifact> protoSources) {
this.protoSources.addTransitive(protoSources);
return this;
}
/**
* Adds all the proto filters to the set of dependencies.
*/
public Builder addPortableProtoFilters(NestedSet<Artifact> protoFilters) {
this.portableProtoFilters.addTransitive(protoFilters);
return this;
}
/**
* Add all protos and filters from providers, and propagate them to any (transitive) dependers
* on this ObjcProtoProvider.
*/
public Builder addTransitive(Iterable<ObjcProtoProvider> providers) {
for (ObjcProtoProvider provider : providers) {
this.protoSources.addTransitive(provider.getProtoSources());
this.portableProtoFilters.addTransitive(provider.getPortableProtoFilters());
}
return this;
}
/**
* Whether this provider has any protos or filters.
*/
public boolean isEmpty() {
return protoSources.isEmpty() && portableProtoFilters.isEmpty();
}
public ObjcProtoProvider build() {
return new ObjcProtoProvider(protoSources.build(), portableProtoFilters.build());
}
}
}
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