1 package org.eclipse.aether.graph;
2
3 /*
4 * Licensed to the Apache Software Foundation (ASF) under one
5 * or more contributor license agreements. See the NOTICE file
6 * distributed with this work for additional information
7 * regarding copyright ownership. The ASF licenses this file
8 * to you under the Apache License, Version 2.0 (the
9 * "License"); you may not use this file except in compliance
10 * with the License. You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing,
15 * software distributed under the License is distributed on an
16 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
17 * KIND, either express or implied. See the License for the
18 * specific language governing permissions and limitations
19 * under the License.
20 */
21
22 /**
23 * A visitor for nodes of the dependency graph.
24 *
25 * @see DependencyNode#accept(DependencyVisitor)
26 */
27 public interface DependencyVisitor
28 {
29
30 /**
31 * Notifies the visitor of a node visit before its children have been processed.
32 *
33 * @param node The dependency node being visited, must not be {@code null}.
34 * @return {@code true} to visit child nodes of the specified node as well, {@code false} to skip children.
35 */
36 boolean visitEnter( DependencyNode node );
37
38 /**
39 * Notifies the visitor of a node visit after its children have been processed. Note that this method is always
40 * invoked regardless whether any children have actually been visited.
41 *
42 * @param node The dependency node being visited, must not be {@code null}.
43 * @return {@code true} to visit siblings nodes of the specified node as well, {@code false} to skip siblings.
44 */
45 boolean visitLeave( DependencyNode node );
46
47 }