package org.eclipse.aether.util.graph.traverser;
   
   /*
    * 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 org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.DefaultArtifact;
  import org.eclipse.aether.collection.DependencyCollectionContext;
  import org.eclipse.aether.collection.DependencyTraverser;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.internal.test.util.TestFileUtils;
  import org.eclipse.aether.internal.test.util.TestUtils;
  import org.junit.After;
  import org.junit.Before;
  import org.junit.Test;
  
  import java.util.Collections;
  
  public class AndDependencyTraverserTest
  {
  
      static class DummyDependencyTraverser
          implements DependencyTraverser
      {
  
          private final boolean traverse;
  
          private final DependencyTraverser child;
  
          public DummyDependencyTraverser()
          {
              this( true );
          }
  
          public DummyDependencyTraverser( boolean traverse )
          {
              this.traverse = traverse;
              this.child = this;
          }
  
          public DummyDependencyTraverser( boolean traverse, DependencyTraverser child )
          {
              this.traverse = traverse;
              this.child = child;
          }
  
          public boolean traverseDependency( Dependency dependency )
          {
              requireNonNull( dependency, "dependency cannot be null" );
              return traverse;
          }
  
          public DependencyTraverser deriveChildTraverser( DependencyCollectionContext context )
          {
              requireNonNull( context, "context cannot be null" );
              return child;
          }
  
      }
  
      private RepositorySystemSession session;
      private DependencyCollectionContext context;
  
      @Before
      public void setup()
      {
          session = TestUtils.newSession();
          context = TestUtils.newCollectionContext( session, null, Collections.emptyList() );
      }
  
      @After
      public void teardown() throws Exception
      {
          if ( session.getLocalRepository() != null )
          {
              TestFileUtils.deleteFile( session.getLocalRepository().getBasedir() );
          }
          session = null;
          context = null;
      }
 
     @Test
     public void testNewInstance()
     {
         assertNull( AndDependencyTraverser.newInstance( null, null ) );
         DependencyTraverser traverser = new DummyDependencyTraverser();
         assertSame( traverser, AndDependencyTraverser.newInstance( traverser, null ) );
         assertSame( traverser, AndDependencyTraverser.newInstance( null, traverser ) );
         assertSame( traverser, AndDependencyTraverser.newInstance( traverser, traverser ) );
         assertNotNull( AndDependencyTraverser.newInstance( traverser, new DummyDependencyTraverser() ) );
     }
 
     @Test
     public void testTraverseDependency()
     {
         Dependency dependency = new Dependency( new DefaultArtifact( "g:a:v:1" ), "runtime" );
 
         DependencyTraverser traverser = new AndDependencyTraverser();
         assertTrue( traverser.traverseDependency( dependency ) );
 
         traverser =
             new AndDependencyTraverser( new DummyDependencyTraverser( false ), new DummyDependencyTraverser( false ) );
         assertFalse( traverser.traverseDependency( dependency ) );
 
         traverser =
             new AndDependencyTraverser( new DummyDependencyTraverser( true ), new DummyDependencyTraverser( false ) );
         assertFalse( traverser.traverseDependency( dependency ) );
 
         traverser =
             new AndDependencyTraverser( new DummyDependencyTraverser( true ), new DummyDependencyTraverser( true ) );
         assertTrue( traverser.traverseDependency( dependency ) );
     }
 
     @Test
     public void testDeriveChildTraverser_Unchanged()
     {
         DependencyTraverser other1 = new DummyDependencyTraverser( true );
         DependencyTraverser other2 = new DummyDependencyTraverser( false );
         DependencyTraverser traverser = new AndDependencyTraverser( other1, other2 );
         assertSame( traverser, traverser.deriveChildTraverser( context ) );
     }
 
     @Test
     public void testDeriveChildTraverser_OneRemaining()
     {
         DependencyTraverser other1 = new DummyDependencyTraverser( true );
         DependencyTraverser other2 = new DummyDependencyTraverser( false, null );
         DependencyTraverser traverser = new AndDependencyTraverser( other1, other2 );
         assertSame( other1, traverser.deriveChildTraverser( context ) );
     }
 
     @Test
     public void testDeriveChildTraverser_ZeroRemaining()
     {
         DependencyTraverser other1 = new DummyDependencyTraverser( true, null );
         DependencyTraverser other2 = new DummyDependencyTraverser( false, null );
         DependencyTraverser traverser = new AndDependencyTraverser( other1, other2 );
         assertNull( traverser.deriveChildTraverser( context ) );
     }
 
     @Test
     public void testEquals()
     {
         DependencyTraverser other1 = new DummyDependencyTraverser( true );
         DependencyTraverser other2 = new DummyDependencyTraverser( false );
         DependencyTraverser traverser1 = new AndDependencyTraverser( other1, other2 );
         DependencyTraverser traverser2 = new AndDependencyTraverser( other2, other1 );
         DependencyTraverser traverser3 = new AndDependencyTraverser( other1 );
         assertEquals( traverser1, traverser1 );
         assertEquals( traverser1, traverser2 );
         assertNotEquals( traverser1, traverser3 );
         assertNotEquals( traverser1, this );
         assertNotEquals( traverser1, null );
     }
 
     @Test
     public void testHashCode()
     {
         DependencyTraverser other1 = new DummyDependencyTraverser( true );
         DependencyTraverser other2 = new DummyDependencyTraverser( false );
         DependencyTraverser traverser1 = new AndDependencyTraverser( other1, other2 );
         DependencyTraverser traverser2 = new AndDependencyTraverser( other2, other1 );
         assertEquals( traverser1.hashCode(), traverser2.hashCode() );
     }
 
 }