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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.eclipse.aether.util.graph.visitor;
import org.eclipse.aether.graph.DependencyNode;
/**
* Generates a sequence of dependency nodes from a dependeny graph by traversing the graph in postorder. This visitor
* visits each node exactly once regardless how many paths within the dependency graph lead to the node such that the
* resulting node sequence is free of duplicates.
*/
public final class PostorderNodeListGenerator extends AbstractDepthFirstNodeListGenerator {
private final Stack visits;
/**
* Creates a new postorder list generator.
*/
public PostorderNodeListGenerator() {
visits = new Stack<>();
}
@Override
public boolean visitEnter(DependencyNode node) {
boolean visited = !setVisited(node);
visits.push(visited);
return !visited;
}
@Override
public boolean visitLeave(DependencyNode node) {
Boolean visited = visits.pop();
if (visited) {
return true;
}
if (node.getDependency() != null) {
nodes.add(node);
}
return true;
}
}