com.facebook.buck.graph.TopologicalSort.java Source code

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Here is the source code for com.facebook.buck.graph.TopologicalSort.java

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/*
 * Copyright 2012-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.graph;

import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;

public class TopologicalSort {

    private TopologicalSort() {
    }

    public static <T> ImmutableList<T> sort(TraversableGraph<T> graph, final Predicate<T> inclusionPredicate) {
        AbstractBottomUpTraversal<T, ImmutableList<T>> traversal = new AbstractBottomUpTraversal<T, ImmutableList<T>>(
                graph) {

            final ImmutableList.Builder<T> builder = ImmutableList.builder();

            @Override
            public void visit(T node) {
                if (inclusionPredicate.apply(node)) {
                    builder.add(node);
                }
            }

            @Override
            public ImmutableList<T> getResult() {
                return builder.build();
            }

        };
        traversal.traverse();
        return traversal.getResult();
    }
}