/*
* Copyright 2016-present Facebook, Inc.
*
* 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.facebook.buck.rules.query;
import com.facebook.buck.query.QueryEnvironment;
import com.facebook.buck.query.QueryException;
import com.facebook.buck.query.QueryTarget;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.util.concurrent.ListeningExecutorService;
import java.util.LinkedHashSet;
import java.util.Set;
import java.util.function.Consumer;
/**
* A classpath(expression [, depth]) expression that calculates targets in the classpath of the
* given library or libraries.
*
* <pre>expr ::= CLASSPATH '(' expr ')'</pre>
*
* <pre> | CLASSPATH '(' expr ',' INTEGER ')'</pre>
*/
public class ClasspathFunction implements QueryEnvironment.QueryFunction {
@Override
public String getName() {
return "classpath";
}
@Override
public int getMandatoryArguments() {
return 1;
}
@Override
public ImmutableList<QueryEnvironment.ArgumentType> getArgumentTypes() {
return ImmutableList.of(
QueryEnvironment.ArgumentType.EXPRESSION, QueryEnvironment.ArgumentType.INTEGER);
}
@Override
public ImmutableSet<QueryTarget> eval(
QueryEnvironment env,
ImmutableList<QueryEnvironment.Argument> args,
ListeningExecutorService executor)
throws QueryException, InterruptedException {
Preconditions.checkArgument(env instanceof GraphEnhancementQueryEnvironment);
Set<QueryTarget> argumentSet = args.get(0).getExpression().eval(env, executor);
int depthBound = args.size() >= 2 ? args.get(1).getInteger() : Integer.MAX_VALUE;
Set<QueryTarget> result = new LinkedHashSet<>(argumentSet);
Set<QueryTarget> current = argumentSet;
for (int i = 0; i < depthBound; i++) {
Set<QueryTarget> next = new LinkedHashSet<>();
Consumer<? super QueryTarget> consumer =
queryTarget -> {
boolean added = result.add(queryTarget);
if (added) {
next.add(queryTarget);
}
};
((GraphEnhancementQueryEnvironment) env).getFirstOrderClasspath(current).forEach(consumer);
if (next.isEmpty()) {
break;
}
current = next;
}
return ImmutableSet.copyOf(result);
}
}