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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.query2.engine;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Sets;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.Argument;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.ArgumentType;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryFunction;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryTaskFuture;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.TransitiveLoadFilesHelper;
import java.util.List;
import java.util.Set;
/**
* A buildfiles(x) query expression, which computes the set of BUILD files and subincluded files for
* each target in set x. The result is unordered. This operator is typically used for determining
* what files or packages to check out.
*
* <pre>expr ::= BUILDFILES '(' expr ')'</pre>
*/
public class BuildFilesFunction implements QueryFunction {
BuildFilesFunction() {
}
@Override
public String getName() {
return "buildfiles";
}
@Override
public <T> QueryTaskFuture<Void> eval(
QueryEnvironment<T> env,
QueryExpressionContext<T> context,
QueryExpression expression,
List<Argument> args,
Callback<T> callback) {
Set<PackageIdentifier> seenPackages = Sets.newConcurrentHashSet();
Set<Label> seenBzlLabels = Sets.newConcurrentHashSet();
Uniquifier<T> uniquifier = env.createUniquifier();
TransitiveLoadFilesHelper<T> helper;
try {
helper = env.getTransitiveLoadFilesHelper();
} catch (QueryException e) {
return env.immediateFailedFuture(e);
}
return env.eval(
args.get(0).getExpression(),
context,
partialResult ->
env.transitiveLoadFiles(
partialResult,
/* alsoAddBuildFiles= */ true,
seenPackages,
seenBzlLabels,
uniquifier,
helper,
callback));
}
@Override
public int getMandatoryArguments() {
return 1;
}
@Override
public List<ArgumentType> getArgumentTypes() {
return ImmutableList.of(ArgumentType.EXPRESSION);
}
}