/*
    * 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 org.eclipse.aether.graph.DependencyNode;
  import org.eclipse.aether.graph.DependencyVisitor;
  import org.eclipse.aether.internal.test.util.DependencyGraphParser;
  import org.junit.Test;
  
  import static org.junit.Assert.*;
  
  public class TreeDependencyVisitorTest {
  
      private DependencyNode parse(String resource) throws Exception {
          return new DependencyGraphParser("visitor/tree/").parseResource(resource);
      }
  
      @Test
      public void testDuplicateSuppression() throws Exception {
          DependencyNode root = parse("cycles.txt");
  
          RecordingVisitor rec = new RecordingVisitor();
          TreeDependencyVisitor visitor = new TreeDependencyVisitor(rec);
          root.accept(visitor);
  
          assertEquals(">a >b >c <c <b >d <d <a ", rec.buffer.toString());
      }
  
      private static class RecordingVisitor implements DependencyVisitor {
  
          StringBuilder buffer = new StringBuilder(256);
  
          public boolean visitEnter(DependencyNode node) {
              buffer.append('>')
                      .append(node.getDependency().getArtifact().getArtifactId())
                      .append(' ');
              return true;
          }
  
          public boolean visitLeave(DependencyNode node) {
              buffer.append('<')
                      .append(node.getDependency().getArtifact().getArtifactId())
                      .append(' ');
              return true;
          }
      }
  }