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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.base.Predicates;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.Argument;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.ArgumentType;
import java.util.List;
import java.util.Set;
/**
* An "rdeps" query expression, which computes the reverse dependencies of the argument within the
* transitive closure of the universe. An optional integer-literal third argument may be
* specified; its value bounds the search from the arguments.
*
* <pre>expr ::= RDEPS '(' expr ',' expr ')'</pre>
* <pre> | RDEPS '(' expr ',' expr ',' WORD ')'</pre>
*/
final class RdepsFunction extends AllRdepsFunction {
RdepsFunction() {}
@Override
public String getName() {
return "rdeps";
}
@Override
public int getMandatoryArguments() {
return super.getMandatoryArguments() + 1; // +1 for the universe.
}
@Override
public List<ArgumentType> getArgumentTypes() {
return ImmutableList.<ArgumentType>builder()
.add(ArgumentType.EXPRESSION).addAll(super.getArgumentTypes()).build();
}
/**
* Compute the transitive closure of the universe, then breadth-first search from the argument
* towards the universe while staying within the transitive closure.
*/
@Override
public <T> Set<T> eval(QueryEnvironment<T> env, QueryExpression expression, List<Argument> args)
throws QueryException, InterruptedException {
Set<T> universeValue = args.get(0).getExpression().eval(env);
env.buildTransitiveClosure(expression, universeValue, Integer.MAX_VALUE);
return eval(env, args.subList(1, args.size()),
Predicates.in(env.getTransitiveClosure(universeValue)));
}
}
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