001package org.eclipse.aether.util.graph.visitor; 002 003/* 004 * Licensed to the Apache Software Foundation (ASF) under one 005 * or more contributor license agreements. See the NOTICE file 006 * distributed with this work for additional information 007 * regarding copyright ownership. The ASF licenses this file 008 * to you under the Apache License, Version 2.0 (the 009 * "License"); you may not use this file except in compliance 010 * with the License. You may obtain a copy of the License at 011 * 012 * http://www.apache.org/licenses/LICENSE-2.0 013 * 014 * Unless required by applicable law or agreed to in writing, 015 * software distributed under the License is distributed on an 016 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 017 * KIND, either express or implied. See the License for the 018 * specific language governing permissions and limitations 019 * under the License. 020 */ 021 022import static org.junit.Assert.*; 023 024import org.eclipse.aether.graph.DependencyNode; 025import org.eclipse.aether.graph.DependencyVisitor; 026import org.eclipse.aether.internal.test.util.DependencyGraphParser; 027import org.junit.Test; 028 029public class TreeDependencyVisitorTest 030{ 031 032 private DependencyNode parse( String resource ) 033 throws Exception 034 { 035 return new DependencyGraphParser( "visitor/tree/" ).parseResource( resource ); 036 } 037 038 @Test 039 public void testDuplicateSuppression() 040 throws Exception 041 { 042 DependencyNode root = parse( "cycles.txt" ); 043 044 RecordingVisitor rec = new RecordingVisitor(); 045 TreeDependencyVisitor visitor = new TreeDependencyVisitor( rec ); 046 root.accept( visitor ); 047 048 assertEquals( ">a >b >c <c <b >d <d <a ", rec.buffer.toString() ); 049 } 050 051 private static class RecordingVisitor 052 implements DependencyVisitor 053 { 054 055 StringBuilder buffer = new StringBuilder( 256 ); 056 057 public boolean visitEnter( DependencyNode node ) 058 { 059 buffer.append( '>' ).append( node.getDependency().getArtifact().getArtifactId() ).append( ' ' ); 060 return true; 061 } 062 063 public boolean visitLeave( DependencyNode node ) 064 { 065 buffer.append( '<' ).append( node.getDependency().getArtifact().getArtifactId() ).append( ' ' ); 066 return true; 067 } 068 069 } 070 071}