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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 dependency graph by traversing the graph in preorder. 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.
* <p>
* The newer classes {@link AbstractDependencyNodeConsumerVisitor} and {@link NodeListGenerator} offer
* similar capabilities but are pluggable. Use of this class, while not deprecated, is discouraged. This class
* is not used in Resolver and is kept only for backward compatibility reasons.
*
* @see PreorderDependencyNodeConsumerVisitor
* @see NodeListGenerator
*
* @deprecated See {@link PreorderDependencyNodeConsumerVisitor} that is more versatile.
*/
@Deprecated
public final class PreorderNodeListGenerator extends AbstractDepthFirstNodeListGenerator {
/**
* Creates a new preorder list generator.
*/
public PreorderNodeListGenerator() {}
@Override
public boolean visitEnter(DependencyNode node) {
if (!setVisited(node)) {
return false;
}
if (node.getDependency() != null) {
nodes.add(node);
}
return true;
}
@Override
public boolean visitLeave(DependencyNode node) {
return true;
}
}