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

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

import com.facebook.buck.android.AndroidLibraryDescription;
import com.facebook.buck.java.JavaLibraryDescription;
import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.rules.TargetGraph;
import com.facebook.buck.rules.TargetNode;
import com.google.common.base.Function;
import com.google.common.base.Preconditions;
import com.google.common.collect.FluentIterable;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;

import java.util.HashMap;
import java.util.Map;

/**
 * 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) {
        Preconditions.checkArgument(targetGraph.isAcyclic());
        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 = Preconditions.checkNotNull(targetGraph.get(buildTarget));
        if (targetNode.getType().equals(JavaLibraryDescription.TYPE)) {
            JavaLibraryDescription.Arg arg = (JavaLibraryDescription.Arg) targetNode.getConstructorArg();
            exportedDeps = arg.exportedDeps.get();
        } else if (targetNode.getType().equals(AndroidLibraryDescription.TYPE)) {
            AndroidLibraryDescription.Arg arg = (AndroidLibraryDescription.Arg) targetNode.getConstructorArg();
            exportedDeps = arg.exportedDeps.get();
        }

        ImmutableSet<BuildTarget> exportedDepsClosure = FluentIterable.from(exportedDeps)
                .transformAndConcat(new Function<BuildTarget, Iterable<BuildTarget>>() {
                    @Override
                    public Iterable<BuildTarget> apply(BuildTarget input) {
                        return Iterables.concat(ImmutableSet.of(input), getExportedDepsClosure(input));
                    }
                }).toSet();
        index.put(buildTarget, exportedDepsClosure);
        return exportedDepsClosure;
    }

}