com.facebook.buck.rules.query.ClasspathFunction.java Source code

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Here is the source code for com.facebook.buck.rules.query.ClasspathFunction.java

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/*
 * 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.util.concurrent.ListeningExecutorService;

import java.util.Set;

/**
 * A classpath(expression) expression that calculates targets in the classpath of the
 * given library or libraries.
 * <pre>expr ::= CLASSPATH '(' expr ')'</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);
    }

    @Override
    public Set<QueryTarget> eval(QueryEnvironment env, ImmutableList<QueryEnvironment.Argument> args,
            ListeningExecutorService executor) throws QueryException, InterruptedException {
        Preconditions.checkArgument(env instanceof GraphEnhancementQueryEnvironment);
        Set<QueryTarget> targets = args.get(0).getExpression().eval(env, executor);
        return ((GraphEnhancementQueryEnvironment) env).getClasspath(targets);
    }
}