com.facebook.buck.jvm.java.intellij.ExportedDepsClosureResolver.java Source code

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Here is the source code for com.facebook.buck.jvm.java.intellij.ExportedDepsClosureResolver.java

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/*
 * Copyright 2015-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.jvm.java.intellij;

import com.facebook.buck.android.AndroidLibraryDescription;
import com.facebook.buck.jvm.java.JavaLibraryDescription;
import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.rules.TargetGraph;
import com.facebook.buck.rules.TargetNode;
import com.facebook.buck.util.MoreCollectors;
import com.google.common.collect.ImmutableSet;

import java.util.HashMap;
import java.util.Map;
import java.util.stream.Stream;

/**
 * Calculates the transitive closure of exported deps for every node in a {@link TargetGraph}.
 */
public class ExportedDepsClosureResolver {

    private TargetGraph targetGraph;
    private Map<BuildTarget, ImmutableSet<BuildTarget>> index;

    public ExportedDepsClosureResolver(TargetGraph targetGraph) {
        this.targetGraph = targetGraph;
        index = new HashMap<>();
    }

    /**
     * @param buildTarget target to process.
     * @return the set of {@link BuildTarget}s that must be appended to the
     *         dependencies of a node Y if node Y depends on X.
     */
    public ImmutableSet<BuildTarget> getExportedDepsClosure(BuildTarget buildTarget) {
        if (index.containsKey(buildTarget)) {
            return index.get(buildTarget);
        }

        ImmutableSet<BuildTarget> exportedDeps = ImmutableSet.of();
        TargetNode<?, ?> targetNode = targetGraph.get(buildTarget);
        if (targetNode.getDescription() instanceof JavaLibraryDescription) {
            JavaLibraryDescription.Arg arg = (JavaLibraryDescription.Arg) targetNode.getConstructorArg();
            exportedDeps = arg.exportedDeps;
        } else if (targetNode.getDescription() instanceof AndroidLibraryDescription) {
            AndroidLibraryDescription.Arg arg = (AndroidLibraryDescription.Arg) targetNode.getConstructorArg();
            exportedDeps = arg.exportedDeps;
        }

        ImmutableSet<BuildTarget> exportedDepsClosure = exportedDeps.stream()
                .flatMap(target -> Stream.concat(Stream.of(target), getExportedDepsClosure(target).stream()))
                .collect(MoreCollectors.toImmutableSet());

        index.put(buildTarget, exportedDepsClosure);
        return exportedDepsClosure;
    }

}