| // Copyright 2014 The Bazel Authors. All rights reserved. |
| // |
| // 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.google.devtools.build.lib.graph; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * A graph visitor that collects the visited nodes in the order in which |
| * they were visited, and allows them to be accessed as a list. |
| */ |
| public class CollectingVisitor<T> extends AbstractGraphVisitor<T> { |
| private final List<Node<T>> order = new ArrayList<>(); |
| |
| @Override |
| public void visitNode(Node<T> node) { |
| order.add(node); |
| } |
| |
| /** |
| * Returns a reference to (not a copy of) the list of visited nodes in the |
| * order they were visited. |
| */ |
| public List<Node<T>> getVisitedNodes() { |
| return order; |
| } |
| } |