| /* |
| * 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.rules; |
| |
| import com.facebook.buck.graph.DefaultImmutableDirectedAcyclicGraph; |
| import com.facebook.buck.graph.MutableDirectedGraph; |
| import com.facebook.buck.model.BuildTarget; |
| import com.google.common.collect.ImmutableMap; |
| |
| import java.util.Map; |
| |
| import javax.annotation.concurrent.Immutable; |
| |
| @Immutable |
| public class DependencyGraph extends DefaultImmutableDirectedAcyclicGraph<BuildRule> { |
| |
| private Map<BuildTarget, BuildRule> index; |
| |
| public DependencyGraph(MutableDirectedGraph<BuildRule> graph) { |
| super(graph); |
| } |
| |
| public BuildRule findBuildRuleByTarget(BuildTarget buildTarget) { |
| if (index == null) { |
| ImmutableMap.Builder<BuildTarget, BuildRule> builder = ImmutableMap.builder(); |
| for (BuildRule rule : getNodes()) { |
| builder.put(rule.getBuildTarget(), rule); |
| } |
| index = builder.build(); |
| } |
| |
| return index.get(buildTarget); |
| } |
| } |