/*
    * 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.resolver.examples.maven;
  
  import javax.inject.Inject;
  
  import java.util.List;
  
  import org.apache.maven.plugin.AbstractMojo;
  import org.apache.maven.plugin.MojoExecutionException;
  import org.apache.maven.plugin.MojoFailureException;
  import org.apache.maven.plugins.annotations.Mojo;
  import org.apache.maven.plugins.annotations.Parameter;
  import org.eclipse.aether.RepositorySystem;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.artifact.DefaultArtifact;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.resolution.ArtifactRequest;
  import org.eclipse.aether.resolution.ArtifactResolutionException;
  import org.eclipse.aether.resolution.ArtifactResult;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Resolves a single artifact (not including its transitive dependencies).
   */
  @Mojo(name = "resolve-artifact", threadSafe = true)
  public class ResolveArtifactMojo extends AbstractMojo {
      private static final Logger LOGGER = LoggerFactory.getLogger(ResolveArtifactMojo.class);
  
      /**
       * The current repository/network configuration of Maven.
       */
      @Parameter(defaultValue = "${repositorySystemSession}", readonly = true)
      private RepositorySystemSession repoSession;
  
      /**
       * The project's remote repositories to use for the resolution.
       */
      @Parameter(defaultValue = "${project.remoteProjectRepositories}", readonly = true)
      private List<RemoteRepository> remoteRepos;
  
      /**
       * The {@code <groupId>:<artifactId>[:<extension>[:<classifier>]]:<version>} of the artifact to resolve.
       */
      @Parameter(property = "resolver.artifactCoords", readonly = true)
      private String artifactCoords;
  
      /**
       * The entry point to Maven Artifact Resolver; that is, the component doing all the work.
       */
      private final RepositorySystem repoSystem;
  
      @Inject
      public ResolveArtifactMojo(RepositorySystem repoSystem) {
          this.repoSystem = repoSystem;
      }
  
      /**
       * The actual execution of the mojo.
       */
      public void execute() throws MojoExecutionException, MojoFailureException {
          Artifact artifact;
          try {
              artifact = new DefaultArtifact(artifactCoords);
          } catch (IllegalArgumentException e) {
              throw new MojoFailureException(e.getMessage(), e);
          }
  
          ArtifactRequest request = new ArtifactRequest();
          request.setArtifact(artifact);
          request.setRepositories(remoteRepos);
  
          LOGGER.info("Resolving artifact {} from {}", artifact, remoteRepos);
  
          ArtifactResult result;
          try {
              result = repoSystem.resolveArtifact(repoSession, request);
          } catch (ArtifactResolutionException e) {
              throw new MojoExecutionException(e.getMessage(), e);
          }
  
         LOGGER.info(
                 "Resolved artifact {} to {} from {}",
                 artifact,
                 result.getArtifact().getFile(),
                 result.getRepository());
     }
 }