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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.Iterables;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryTaskFuture;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.ThreadSafeMutableSet;
import java.util.List;
/**
* A loadfiles(x) query expression, which computes the set of .bzl 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 ::= LOADFILES '(' expr ')'</pre>
*/
public class LoadFilesFunction implements QueryEnvironment.QueryFunction {
LoadFilesFunction() {}
@Override
public String getName() {
return "loadfiles";
}
@Override
public <T> QueryTaskFuture<Void> eval(
final QueryEnvironment<T> env,
VariableContext<T> context,
final QueryExpression expression,
List<QueryEnvironment.Argument> args,
final Callback<T> callback) {
final Uniquifier<T> uniquifier = env.createUniquifier();
return env.eval(
args.get(0).getExpression(),
context,
new Callback<T>() {
@Override
public void process(Iterable<T> partialResult)
throws QueryException, InterruptedException {
ThreadSafeMutableSet<T> result = env.createThreadSafeMutableSet();
Iterables.addAll(result, partialResult);
callback.process(uniquifier.unique(
env.getBuildFiles(
expression,
result,
/* BUILD */ false,
/* load */ true)));
}
});
}
@Override
public int getMandatoryArguments() {
return 1;
}
@Override
public List<QueryEnvironment.ArgumentType> getArgumentTypes() {
return ImmutableList.of(QueryEnvironment.ArgumentType.EXPRESSION);
}
}
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