package org.apache.maven.resolver.examples.resolver;
   
   /*
    * 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.io.ByteArrayOutputStream;
  import java.io.PrintStream;
  
  import org.apache.maven.resolver.examples.util.Booter;
  import org.apache.maven.resolver.examples.util.ConsoleDependencyGraphDumper;
  import org.eclipse.aether.DefaultRepositorySystemSession;
  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.collection.CollectRequest;
  import org.eclipse.aether.deployment.DeployRequest;
  import org.eclipse.aether.deployment.DeploymentException;
  import org.eclipse.aether.graph.Dependency;
  import org.eclipse.aether.graph.DependencyNode;
  import org.eclipse.aether.installation.InstallRequest;
  import org.eclipse.aether.installation.InstallationException;
  import org.eclipse.aether.repository.Authentication;
  import org.eclipse.aether.repository.LocalRepository;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.resolution.DependencyRequest;
  import org.eclipse.aether.resolution.DependencyResolutionException;
  import org.eclipse.aether.util.graph.visitor.PreorderNodeListGenerator;
  import org.eclipse.aether.util.repository.AuthenticationBuilder;
  
  /**
   */
  public class Resolver
  {
      private String remoteRepository;
  
      private RepositorySystem repositorySystem;
  
      private LocalRepository localRepository;
  
      public Resolver( String remoteRepository, String localRepository )
      {
          this.remoteRepository = remoteRepository;
          this.repositorySystem = Booter.newRepositorySystem();
          this.localRepository = new LocalRepository( localRepository );
      }
  
      private RepositorySystemSession newSession()
      {
          DefaultRepositorySystemSession session = Booter.newRepositorySystemSession( repositorySystem );
          session.setLocalRepositoryManager( repositorySystem.newLocalRepositoryManager( session, localRepository ) );
          return session;
      }
  
      public ResolverResult resolve( String groupId, String artifactId, String version )
          throws DependencyResolutionException
      {
          RepositorySystemSession session = newSession();
          Dependency dependency =
              new Dependency( new DefaultArtifact( groupId, artifactId, "", "jar", version ), "runtime" );
          RemoteRepository central = new RemoteRepository.Builder( "central", "default", remoteRepository ).build();
  
          CollectRequest collectRequest = new CollectRequest();
          collectRequest.setRoot( dependency );
          collectRequest.addRepository( central );
  
          DependencyRequest dependencyRequest = new DependencyRequest();
          dependencyRequest.setCollectRequest( collectRequest );
  
          DependencyNode rootNode = repositorySystem.resolveDependencies( session, dependencyRequest ).getRoot();
  
          StringBuilder dump = new StringBuilder();
          displayTree( rootNode, dump );
  
          PreorderNodeListGenerator nlg = new PreorderNodeListGenerator();
          rootNode.accept( nlg );
  
          return new ResolverResult( rootNode, nlg.getFiles(), nlg.getClassPath() );
      }
  
      public void install( Artifact artifact, Artifact pom )
          throws InstallationException
      {
         RepositorySystemSession session = newSession();
 
         InstallRequest installRequest = new InstallRequest();
         installRequest.addArtifact( artifact ).addArtifact( pom );
 
         repositorySystem.install( session, installRequest );
     }
 
     public void deploy( Artifact artifact, Artifact pom, String remoteRepository )
         throws DeploymentException
     {
         RepositorySystemSession session = newSession();
 
         Authentication auth = new AuthenticationBuilder().addUsername( "admin" ).addPassword( "admin123" ).build();
         RemoteRepository nexus =
             new RemoteRepository.Builder( "nexus", "default", remoteRepository ).setAuthentication( auth ).build();
 
         DeployRequest deployRequest = new DeployRequest();
         deployRequest.addArtifact( artifact ).addArtifact( pom );
         deployRequest.setRepository( nexus );
 
         repositorySystem.deploy( session, deployRequest );
     }
 
     private void displayTree( DependencyNode node, StringBuilder sb )
     {
         ByteArrayOutputStream os = new ByteArrayOutputStream( 1024 );
         node.accept( new ConsoleDependencyGraphDumper( new PrintStream( os ) ) );
         sb.append( os.toString() );
     }
 
 }