| /* |
| * 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.Preconditions; |
| import com.google.common.collect.ImmutableSet; |
| |
| public class DefaultImmutableDirectedAcyclicGraph<T> implements ImmutableDirectedAcyclicGraph<T> { |
| |
| private final MutableDirectedGraph<T> graph; |
| |
| public DefaultImmutableDirectedAcyclicGraph(MutableDirectedGraph<T> graph) { |
| Preconditions.checkNotNull(graph); |
| Preconditions.checkArgument(graph.isAcyclic()); |
| this.graph = new MutableDirectedGraph<T>(graph); |
| } |
| |
| @Override |
| public ImmutableSet<T> getOutgoingNodesFor(T source) { |
| return graph.getOutgoingNodesFor(source); |
| } |
| |
| @Override |
| public ImmutableSet<T> getIncomingNodesFor(T sink) { |
| return graph.getIncomingNodesFor(sink); |
| } |
| |
| @Override |
| public ImmutableSet<T> getNodesWithNoOutgoingEdges() { |
| return graph.getNodesWithNoOutgoingEdges(); |
| } |
| |
| @Override |
| public ImmutableSet<T> getNodesWithNoIncomingEdges() { |
| return graph.getNodesWithNoIncomingEdges(); |
| } |
| |
| public String toDebugString() { |
| StringBuilder builder = new StringBuilder(); |
| builder.append("Number of nodes: " + graph.getNodes().size() + "\n"); |
| for (T node : graph.getNodes()) { |
| for (T sink : graph.getOutgoingNodesFor(node)) { |
| builder.append(String.format("%s => %s\n", node, sink)); |
| } |
| } |
| return builder.toString(); |
| } |
| |
| /** @return the number of nodes in the graph */ |
| public int getNodeCount() { |
| return graph.getNodeCount(); |
| } |
| |
| /** @return an unmodifiable view of the nodes in this graph */ |
| public Iterable<T> getNodes() { |
| return graph.getNodes(); |
| } |
| } |