package org.eclipse.aether.util.graph.selector;
   
   /*
    * 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.DependencySelector;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.internal.test.util.TestUtils;
  import org.junit.Test;
  
  import java.util.Collections;
  
  public class AndDependencySelectorTest
  {
  
      static class DummyDependencySelector
          implements DependencySelector
      {
  
          private final boolean select;
  
          private final DependencySelector child;
  
          public DummyDependencySelector()
          {
              this( true );
          }
  
          public DummyDependencySelector( boolean select )
          {
              this.select = select;
              this.child = this;
          }
  
          public DummyDependencySelector( boolean select, DependencySelector child )
          {
              this.select = select;
              this.child = child;
          }
  
          public boolean selectDependency( Dependency dependency )
          {
              requireNonNull( dependency, "dependency cannot be null" );
              return select;
          }
  
          public DependencySelector deriveChildSelector( DependencyCollectionContext context )
          {
              requireNonNull( context, "context cannot be null" );
              return child;
          }
  
          @Override
          public String toString()
          {
              return "Dummy(" + select + ')';
          }
      }
  
      @Test
      public void testNewInstance()
      {
          assertNull( AndDependencySelector.newInstance( null, null ) );
          DependencySelector selector = new DummyDependencySelector();
          assertSame( selector, AndDependencySelector.newInstance( selector, null ) );
          assertSame( selector, AndDependencySelector.newInstance( null, selector ) );
          assertSame( selector, AndDependencySelector.newInstance( selector, selector ) );
          assertNotNull( AndDependencySelector.newInstance( selector, new DummyDependencySelector() ) );
      }
  
      @Test
      public void testTraverseDependency()
      {
          Dependency dependency = new Dependency( new DefaultArtifact( "g:a:v:1" ), "runtime" );
  
          DependencySelector selector = new AndDependencySelector();
          assertTrue( selector.selectDependency( dependency ) );
 
         selector =
             new AndDependencySelector( new DummyDependencySelector( false ), new DummyDependencySelector( false ) );
         assertFalse( selector.selectDependency( dependency ) );
 
         selector =
             new AndDependencySelector( new DummyDependencySelector( true ), new DummyDependencySelector( false ) );
         assertFalse( selector.selectDependency( dependency ) );
 
         selector = new AndDependencySelector( new DummyDependencySelector( true ), new DummyDependencySelector( true ) );
         assertTrue( selector.selectDependency( dependency ) );
     }
 
     @Test
     public void testDeriveChildSelector_Unchanged()
     {
         DependencySelector other1 = new DummyDependencySelector( true );
         DependencySelector other2 = new DummyDependencySelector( false );
         DependencySelector selector = new AndDependencySelector( other1, other2 );
         RepositorySystemSession session = TestUtils.newSession();
         DependencyCollectionContext context = TestUtils.newCollectionContext( session,
                 null,
                 Collections.emptyList() );
         assertSame( selector, selector.deriveChildSelector( context ) );
     }
 
     @Test
     public void testDeriveChildSelector_OneRemaining()
     {
         DependencySelector other1 = new DummyDependencySelector( true );
         DependencySelector other2 = new DummyDependencySelector( false, null );
         DependencySelector selector = new AndDependencySelector( other1, other2 );
         RepositorySystemSession session = TestUtils.newSession();
         DependencyCollectionContext context = TestUtils.newCollectionContext( session,
                 null,
                 Collections.emptyList() );
         assertSame( other1, selector.deriveChildSelector( context ) );
     }
 
     @Test
     public void testDeriveChildSelector_ZeroRemaining()
     {
         DependencySelector other1 = new DummyDependencySelector( true, null );
         DependencySelector other2 = new DummyDependencySelector( false, null );
         DependencySelector selector = new AndDependencySelector( other1, other2 );
         RepositorySystemSession session = TestUtils.newSession();
         DependencyCollectionContext context = TestUtils.newCollectionContext( session,
                 null,
                 Collections.emptyList() );
         assertNull( selector.deriveChildSelector( context ) );
     }
 
     @Test
     public void testEquals()
     {
         DependencySelector other1 = new DummyDependencySelector( true );
         DependencySelector other2 = new DummyDependencySelector( false );
         DependencySelector selector1 = new AndDependencySelector( other1, other2 );
         DependencySelector selector2 = new AndDependencySelector( other2, other1 );
         DependencySelector selector3 = new AndDependencySelector( other1 );
         assertEquals( selector1, selector1 );
         assertEquals( selector1, selector2 );
         assertNotEquals( selector1, selector3 );
         assertNotEquals( selector1, this );
         assertNotEquals( selector1, null );
     }
 
     @Test
     public void testHashCode()
     {
         DependencySelector other1 = new DummyDependencySelector( true );
         DependencySelector other2 = new DummyDependencySelector( false );
         DependencySelector selector1 = new AndDependencySelector( other1, other2 );
         DependencySelector selector2 = new AndDependencySelector( other2, other1 );
         assertEquals( selector1.hashCode(), selector2.hashCode() );
     }
 
     @Test
     public void testToString()
     {
         DependencySelector andSelector = new AndDependencySelector(
             new DummyDependencySelector( true ),
             new DummyDependencySelector( false )
         );
         assertEquals("AndDependencySelector(Dummy(true) && Dummy(false))", andSelector.toString());
     }
 
 }