package org.apache.maven.shared.dependency.graph.internal;
   
   /*
    * 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 org.eclipse.aether.RepositoryException;
  import org.eclipse.aether.util.graph.transformer.ConflictResolver.ConflictContext;
  import org.eclipse.aether.util.graph.transformer.ConflictResolver.ScopeSelector;
  import org.eclipse.aether.util.graph.transformer.JavaScopeSelector;
  
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.List;
  
  /**
   * A JavaScopeSelector that keeps track of reduced scopes
   * 
   */
  public class VerboseJavaScopeSelector extends ScopeSelector
  {
      public static final String REDUCED_SCOPE = "REDUCED_SCOPE";
      
      private final ScopeSelector scopeSelector = new JavaScopeSelector();
  
      @Override
      public void selectScope( ConflictContext context )
          throws RepositoryException
      {
          scopeSelector.selectScope( context );
          
          context.getItems().stream()
              .flatMap( i -> i.getScopes().stream() )
              .distinct()
              .max( new ScopeComparator() )
              .filter( s -> s != context.getScope() )
              .ifPresent( s -> context.getWinner().getNode().setData( REDUCED_SCOPE, s ) );
      }
      
      static class ScopeComparator implements Comparator<String>
      {
          List<String> orderedScopes = Arrays.asList( "compile", "runtime", "provided", "test" );
  
          @Override
          public int compare( String lhs, String rhs )
          {
              return orderedScopes.indexOf( rhs ) - orderedScopes.indexOf( lhs );
          }
      }    
  }