package org.eclipse.aether.util.graph.visitor;
   
   /*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   * 
   *  http://www.apache.org/licenses/LICENSE-2.0
   * 
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  import static java.util.Objects.requireNonNull;
  import static org.junit.Assert.*;
  
  import java.util.List;
  
  import org.eclipse.aether.graph.DependencyFilter;
  import org.eclipse.aether.graph.DependencyNode;
  import org.eclipse.aether.internal.test.util.DependencyGraphParser;
  import org.junit.Test;
  
  public class FilteringDependencyVisitorTest
  {
  
      private DependencyNode parse( String resource )
          throws Exception
      {
          return new DependencyGraphParser( "visitor/filtering/" ).parseResource( resource );
      }
  
      @Test
      public void testFilterCalledWithProperParentStack()
          throws Exception
      {
          DependencyNode root = parse( "parents.txt" );
  
          final StringBuilder buffer = new StringBuilder( 256 );
          DependencyFilter filter = new DependencyFilter()
          {
              public boolean accept( DependencyNode node, List<DependencyNode> parents )
              {
                  requireNonNull( node, "node cannot be null" );
                  requireNonNull( parents, "parents cannot be null" );
                  for ( DependencyNode parent : parents )
                  {
                      buffer.append( parent.getDependency().getArtifact().getArtifactId() );
                  }
                  buffer.append( "," );
                  return false;
              }
          };
  
          FilteringDependencyVisitor visitor = new FilteringDependencyVisitor( new PreorderNodeListGenerator(), filter );
          root.accept( visitor );
  
          assertEquals( ",a,ba,cba,a,ea,", buffer.toString() );
      }
  
  }