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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 static java.util.stream.Collectors.joining;
import com.google.common.base.Functions;
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 com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryFunction;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryTaskFuture;
import java.util.Collection;
import java.util.List;
/**
* A query expression for user-defined query functions.
*/
public class FunctionExpression extends QueryExpression {
QueryFunction function;
List<Argument> args;
public FunctionExpression(QueryFunction function, List<Argument> args) {
this.function = function;
this.args = ImmutableList.copyOf(args);
}
public QueryFunction getFunction() {
return function;
}
public List<Argument> getArgs() {
return args;
}
@Override
public <T> QueryTaskFuture<Void> eval(
QueryEnvironment<T> env, QueryExpressionContext<T> context, Callback<T> callback) {
return function.eval(env, context, this, args, callback);
}
@Override
public void collectTargetPatterns(Collection<String> literals) {
for (Argument arg : args) {
if (arg.getType() == ArgumentType.EXPRESSION) {
arg.getExpression().collectTargetPatterns(literals);
}
}
}
@Override
public <T, C> T accept(QueryExpressionVisitor<T, C> visitor, C context) {
return visitor.visit(this, context);
}
@Override
public String toString() {
return function.getName()
+ "("
+ args.stream().map(Functions.toStringFunction()).collect(joining(", "))
+ ")";
}
}
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