/*
    * 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.apache.maven.artifact.resolver;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  
  import org.codehaus.plexus.component.annotations.Component;
  
  /**
   * @author Benjamin Bentmann
   */
  @Component(role = ResolutionErrorHandler.class)
  public class DefaultResolutionErrorHandler implements ResolutionErrorHandler {
  
      public void throwErrors(ArtifactResolutionRequest request, ArtifactResolutionResult result)
              throws ArtifactResolutionException {
          // Metadata cannot be found
  
          if (result.hasMetadataResolutionExceptions()) {
              throw result.getMetadataResolutionException(0);
          }
  
          // Metadata cannot be retrieved
  
          // Cyclic Dependency Error
  
          if (result.hasCircularDependencyExceptions()) {
              throw result.getCircularDependencyException(0);
          }
  
          // Version Range Violation
  
          if (result.hasVersionRangeViolations()) {
              throw result.getVersionRangeViolation(0);
          }
  
          // Transfer Error
  
          if (result.hasErrorArtifactExceptions()) {
              throw result.getErrorArtifactExceptions().get(0);
          }
  
          if (result.hasMissingArtifacts()) {
              throw new MultipleArtifactsNotFoundException(
                      request.getArtifact(),
                      toList(result.getArtifacts()),
                      result.getMissingArtifacts(),
                      request.getRemoteRepositories());
          }
  
          // this should never happen since we checked all possible error sources before but better be sure
          if (result.hasExceptions()) {
              throw new ArtifactResolutionException(
                      "Unknown error during artifact resolution, " + request + ", " + result.getExceptions(),
                      request.getArtifact(),
                      request.getRemoteRepositories());
          }
      }
  
      private static <T> List<T> toList(Collection<T> items) {
          return (items != null) ? new ArrayList<>(items) : null;
      }
  }