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}