com.google.devtools.build.lib.query2.engine.FunctionExpression.java Source code

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Here is the source code for com.google.devtools.build.lib.query2.engine.FunctionExpression.java

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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.Functions;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
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 java.util.Collection;
import java.util.List;
import java.util.concurrent.ForkJoinPool;

/**
 * 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
    protected <T> void evalImpl(QueryEnvironment<T> env, VariableContext<T> context, Callback<T> callback)
            throws QueryException, InterruptedException {
        function.eval(env, context, this, args, callback);
    }

    @Override
    protected <T> void parEvalImpl(QueryEnvironment<T> env, VariableContext<T> context,
            ThreadSafeCallback<T> callback, ForkJoinPool forkJoinPool) throws QueryException, InterruptedException {
        function.parEval(env, context, this, args, callback, forkJoinPool);
    }

    @Override
    public void collectTargetPatterns(Collection<String> literals) {
        for (Argument arg : args) {
            if (arg.getType() == ArgumentType.EXPRESSION) {
                arg.getExpression().collectTargetPatterns(literals);
            }
        }
    }

    @Override
    public QueryExpression getMapped(QueryExpressionMapper mapper) {
        return mapper.map(this);
    }

    @Override
    public String toString() {
        return function.getName() + "("
                + Joiner.on(", ").join(Iterables.transform(args, Functions.toStringFunction())) + ")";
    }
}