/*
    * 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.
   */
  package org.eclipse.aether.internal.impl;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import java.util.Map;
  
  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, Map<String, MetadataGeneratorFactory> factories) {
          return PrioritizedComponents.reuseOrCreate(session, factories, MetadataGeneratorFactory::getPriority);
      }
  
      public static List<Metadata> prepareMetadata(
              List<? extends MetadataGenerator> generators, List<? extends Artifact> artifacts) {
          List<Metadata> metadatas = new ArrayList<>();
  
          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<>();
  
          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<>(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, 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, 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);
         }
     }
 }