package org.eclipse.aether.util.graph.transformer;
   
   /*
    * 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.collection.DependencyGraphTransformationContext;
  import org.eclipse.aether.collection.DependencyGraphTransformer;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.graph.DependencyNode;
  import org.eclipse.aether.util.artifact.JavaScopes;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * A dependency graph transformer that refines the request context for nodes that belong to the "project" context by
   * appending the classpath type to which the node belongs. For instance, a compile-time project dependency will be
   * assigned the request context "project/compile".
   * 
   * @see DependencyNode#getRequestContext()
   */
  public final class JavaDependencyContextRefiner
      implements DependencyGraphTransformer
  {
  
      public DependencyNode transformGraph( DependencyNode node, DependencyGraphTransformationContext context )
          throws RepositoryException
      {
          requireNonNull( node, "node cannot be null" );
          requireNonNull( context, "context cannot be null" );
          String ctx = node.getRequestContext();
  
          if ( "project".equals( ctx ) )
          {
              String scope = getClasspathScope( node );
              if ( scope != null )
              {
                  ctx += '/' + scope;
                  node.setRequestContext( ctx );
              }
          }
  
          for ( DependencyNode child : node.getChildren() )
          {
              transformGraph( child, context );
          }
  
          return node;
      }
  
      private String getClasspathScope( DependencyNode node )
      {
          Dependency dependency = node.getDependency();
          if ( dependency == null )
          {
              return null;
          }
  
          String scope = dependency.getScope();
  
          if ( JavaScopes.COMPILE.equals( scope ) || JavaScopes.SYSTEM.equals( scope )
              || JavaScopes.PROVIDED.equals( scope ) )
          {
              return JavaScopes.COMPILE;
          }
          else if ( JavaScopes.RUNTIME.equals( scope ) )
          {
              return JavaScopes.RUNTIME;
          }
          else if ( JavaScopes.TEST.equals( scope ) )
          {
              return JavaScopes.TEST;
          }
  
          return null;
      }
  
  }