1 /*******************************************************************************
2 * Copyright (c) 2010, 2011 Sonatype, Inc.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * Sonatype, Inc. - initial API and implementation
10 *******************************************************************************/
11 package org.eclipse.aether.graph;
12
13 /**
14 * A visitor for nodes of the dependency graph.
15 *
16 * @see DependencyNode#accept(DependencyVisitor)
17 */
18 public interface DependencyVisitor
19 {
20
21 /**
22 * Notifies the visitor of a node visit before its children have been processed.
23 *
24 * @param node The dependency node being visited, must not be {@code null}.
25 * @return {@code true} to visit child nodes of the specified node as well, {@code false} to skip children.
26 */
27 boolean visitEnter( DependencyNode node );
28
29 /**
30 * Notifies the visitor of a node visit after its children have been processed. Note that this method is always
31 * invoked regardless whether any children have actually been visited.
32 *
33 * @param node The dependency node being visited, must not be {@code null}.
34 * @return {@code true} to visit siblings nodes of the specified node as well, {@code false} to skip siblings.
35 */
36 boolean visitLeave( DependencyNode node );
37
38 }