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 java.util.Objects.requireNonNull;
023import static org.junit.Assert.*;
024
025import java.util.List;
026
027import org.eclipse.aether.graph.DependencyFilter;
028import org.eclipse.aether.graph.DependencyNode;
029import org.eclipse.aether.internal.test.util.DependencyGraphParser;
030import org.junit.Test;
031
032public class FilteringDependencyVisitorTest
033{
034
035    private DependencyNode parse( String resource )
036        throws Exception
037    {
038        return new DependencyGraphParser( "visitor/filtering/" ).parseResource( resource );
039    }
040
041    @Test
042    public void testFilterCalledWithProperParentStack()
043        throws Exception
044    {
045        DependencyNode root = parse( "parents.txt" );
046
047        final StringBuilder buffer = new StringBuilder( 256 );
048        DependencyFilter filter = new DependencyFilter()
049        {
050            public boolean accept( DependencyNode node, List<DependencyNode> parents )
051            {
052                requireNonNull( node, "node cannot be null" );
053                requireNonNull( parents, "parents cannot be null" );
054                for ( DependencyNode parent : parents )
055                {
056                    buffer.append( parent.getDependency().getArtifact().getArtifactId() );
057                }
058                buffer.append( "," );
059                return false;
060            }
061        };
062
063        FilteringDependencyVisitor visitor = new FilteringDependencyVisitor( new PreorderNodeListGenerator(), filter );
064        root.accept( visitor );
065
066        assertEquals( ",a,ba,cba,a,ea,", buffer.toString() );
067    }
068
069}