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// Copyright 2018 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;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.query2.engine.Callback;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment;
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.ThreadSafeMutableSet;
import com.google.devtools.build.lib.query2.engine.QueryExpression;
import com.google.devtools.build.lib.query2.engine.QueryExpressionContext;
import com.google.devtools.build.lib.query2.engine.QueryUtil;
import java.util.List;
/**
* A "config" query expression for cquery. The first argument is the expression to be evaluated. The
* second argument is either "host", "target", or "null" to specify which configuration the
* user is seeking to query in. If some but not all results of expr can be found in the specified
* config, then the subset that can be is returned. If no results of expr can be found in the
* specified config, then an error is thrown.
*
* <pre> expr ::= CONFIG '(' expr ',' word ')'</pre>
*/
public final class ConfigFunction implements QueryFunction {
public ConfigFunction() {
}
@Override
public String getName() {
return "config";
}
@Override
public int getMandatoryArguments() {
return 2;
}
@Override
public List<ArgumentType> getArgumentTypes() {
return ImmutableList.of(ArgumentType.EXPRESSION, ArgumentType.WORD);
}
/**
* This function is only viable with ConfiguredTargetQueryEnvironment which extends {@link
* AbstractBlazeQueryEnvironment<ConfiguredTarget>}
*/
@Override
@SuppressWarnings("unchecked")
public <T> QueryTaskFuture<Void> eval(
QueryEnvironment<T> env,
QueryExpressionContext<T> context,
QueryExpression expression,
List<Argument> args,
final Callback<T> callback) {
Argument targetExpression = args.get(0);
String configuration = args.get(1).toString();
final QueryTaskFuture<ThreadSafeMutableSet<T>> targets =
QueryUtil.evalAll(env, context, targetExpression.getExpression());
return env.whenSucceedsCall(
targets,
((ConfiguredTargetQueryEnvironment) env)
.getConfiguredTargets(
targetExpression.toString(),
(ThreadSafeMutableSet<ConfiguredTarget>) targets.getIfSuccessful(),
configuration,
(Callback<ConfiguredTarget>) callback));
}
}
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