package org.eclipse.aether.internal.impl;
   
   /*
    * 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 java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.impl.MetadataGenerator;
  import org.eclipse.aether.impl.MetadataGeneratorFactory;
  import org.eclipse.aether.impl.OfflineController;
  import org.eclipse.aether.metadata.Metadata;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.resolution.ResolutionErrorPolicy;
  import org.eclipse.aether.resolution.ResolutionErrorPolicyRequest;
  import org.eclipse.aether.transfer.RepositoryOfflineException;
  
  /**
   * Internal utility methods.
   */
  final class Utils
  {
  
      public static PrioritizedComponents<MetadataGeneratorFactory> sortMetadataGeneratorFactories( RepositorySystemSession session,
                                                                                                    Collection<? extends MetadataGeneratorFactory> factories )
      {
          PrioritizedComponents<MetadataGeneratorFactory> result =
              new PrioritizedComponents<MetadataGeneratorFactory>( session );
          for ( MetadataGeneratorFactory factory : factories )
          {
              result.add( factory, factory.getPriority() );
          }
          return result;
      }
  
      public static List<Metadata> prepareMetadata( List<? extends MetadataGenerator> generators,
                                                    List<? extends Artifact> artifacts )
      {
          List<Metadata> metadatas = new ArrayList<Metadata>();
  
          for ( MetadataGenerator generator : generators )
          {
              metadatas.addAll( generator.prepare( artifacts ) );
          }
  
          return metadatas;
      }
  
      public static List<Metadata> finishMetadata( List<? extends MetadataGenerator> generators,
                                                   List<? extends Artifact> artifacts )
      {
          List<Metadata> metadatas = new ArrayList<Metadata>();
  
          for ( MetadataGenerator generator : generators )
          {
              metadatas.addAll( generator.finish( artifacts ) );
          }
  
          return metadatas;
      }
  
      public static <T> List<T> combine( Collection<? extends T> first, Collection<? extends T> second )
      {
          List<T> result = new ArrayList<T>( first.size() + second.size() );
          result.addAll( first );
          result.addAll( second );
          return result;
      }
  
      public static int getPolicy( RepositorySystemSession session, Artifact artifact, RemoteRepository repository )
      {
          ResolutionErrorPolicy rep = session.getResolutionErrorPolicy();
          if ( rep == null )
          {
              return ResolutionErrorPolicy.CACHE_DISABLED;
          }
          return rep.getArtifactPolicy( session, new ResolutionErrorPolicyRequest<Artifact>( artifact, repository ) );
      }
  
      public static int getPolicy( RepositorySystemSession session, Metadata metadata, RemoteRepository repository )
     {
         ResolutionErrorPolicy rep = session.getResolutionErrorPolicy();
         if ( rep == null )
         {
             return ResolutionErrorPolicy.CACHE_DISABLED;
         }
         return rep.getMetadataPolicy( session, new ResolutionErrorPolicyRequest<Metadata>( metadata, repository ) );
     }
 
     public static void appendClassLoader( StringBuilder buffer, Object component )
     {
         ClassLoader loader = component.getClass().getClassLoader();
         if ( loader != null && !loader.equals( Utils.class.getClassLoader() ) )
         {
             buffer.append( " from " ).append( loader );
         }
     }
 
     public static void checkOffline( RepositorySystemSession session, OfflineController offlineController,
                                      RemoteRepository repository )
         throws RepositoryOfflineException
     {
         if ( session.isOffline() )
         {
             offlineController.checkOffline( session, repository );
         }
     }
 
 }