/*
    * 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.
   */
  package org.eclipse.aether.util.graph.visitor;
  
  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;
  
  import static java.util.Objects.requireNonNull;
  import static org.junit.Assert.*;
  
  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());
      }
  }