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.net.URI;
  import java.net.URISyntaxException;
  import java.util.Arrays;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.List;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.metadata.Metadata;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.spi.connector.layout.RepositoryLayout;
  import org.eclipse.aether.spi.connector.layout.RepositoryLayoutFactory;
  import org.eclipse.aether.transfer.NoRepositoryLayoutException;
  import org.eclipse.aether.util.ConfigUtils;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Provides a Maven-2 repository layout for repositories with content type {@code "default"}.
   */
  @Singleton
  @Named( "maven2" )
  public final class Maven2RepositoryLayoutFactory
      implements RepositoryLayoutFactory
  {
  
      static final String CONFIG_PROP_SIGNATURE_CHECKSUMS = "aether.checksums.forSignature";
      static final String CONFIG_PROP_CHECKSUMS_ALGORITHMS = "aether.checksums.algorithms";
  
      static final String DEFAULT_CHECKSUMS_ALGORITHMS = "SHA-1,MD5";
  
      private float priority;
  
      public float getPriority()
      {
          return priority;
      }
  
      /**
       * Sets the priority of this component.
       *
       * @param priority The priority.
       * @return This component for chaining, never {@code null}.
       */
      public Maven2RepositoryLayoutFactory setPriority( float priority )
      {
          this.priority = priority;
          return this;
      }
  
      public RepositoryLayout newInstance( RepositorySystemSession session, RemoteRepository repository )
          throws NoRepositoryLayoutException
      {
          requireNonNull( session, "session cannot be null" );
          requireNonNull( repository, "repository cannot be null" );
          if ( !"default".equals( repository.getContentType() ) )
          {
              throw new NoRepositoryLayoutException( repository );
          }
          boolean forSignature = ConfigUtils.getBoolean( session, false, CONFIG_PROP_SIGNATURE_CHECKSUMS );
          List<String> checksumsAlgorithms = Arrays.asList( ConfigUtils.getString( session,
                  DEFAULT_CHECKSUMS_ALGORITHMS, CONFIG_PROP_CHECKSUMS_ALGORITHMS ).split( "," ) );
  
          return forSignature
                  ? new Maven2RepositoryLayout( checksumsAlgorithms )
                  : new Maven2RepositoryLayoutEx( checksumsAlgorithms );
      }
  
      private static class Maven2RepositoryLayout
          implements RepositoryLayout
      {
  
          private final List<String> checksumsAlgorithms;
  
         protected Maven2RepositoryLayout( List<String> checksumsAlgorithms )
         {
             this.checksumsAlgorithms = checksumsAlgorithms;
         }
 
         private URI toUri( String path )
         {
             try
             {
                 return new URI( null, null, path, null );
             }
             catch ( URISyntaxException e )
             {
                 throw new IllegalStateException( e );
             }
         }
 
         public URI getLocation( Artifact artifact, boolean upload )
         {
             StringBuilder path = new StringBuilder( 128 );
 
             path.append( artifact.getGroupId().replace( '.', '/' ) ).append( '/' );
 
             path.append( artifact.getArtifactId() ).append( '/' );
 
             path.append( artifact.getBaseVersion() ).append( '/' );
 
             path.append( artifact.getArtifactId() ).append( '-' ).append( artifact.getVersion() );
 
             if ( artifact.getClassifier().length() > 0 )
             {
                 path.append( '-' ).append( artifact.getClassifier() );
             }
 
             if ( artifact.getExtension().length() > 0 )
             {
                 path.append( '.' ).append( artifact.getExtension() );
             }
 
             return toUri( path.toString() );
         }
 
         public URI getLocation( Metadata metadata, boolean upload )
         {
             StringBuilder path = new StringBuilder( 128 );
 
             if ( metadata.getGroupId().length() > 0 )
             {
                 path.append( metadata.getGroupId().replace( '.', '/' ) ).append( '/' );
 
                 if ( metadata.getArtifactId().length() > 0 )
                 {
                     path.append( metadata.getArtifactId() ).append( '/' );
 
                     if ( metadata.getVersion().length() > 0 )
                     {
                         path.append( metadata.getVersion() ).append( '/' );
                     }
                 }
             }
 
             path.append( metadata.getType() );
 
             return toUri( path.toString() );
         }
 
         public List<Checksum> getChecksums( Artifact artifact, boolean upload, URI location )
         {
             return getChecksums( location );
         }
 
         public List<Checksum> getChecksums( Metadata metadata, boolean upload, URI location )
         {
             return getChecksums( location );
         }
 
         private List<Checksum> getChecksums( URI location )
         {
             List<Checksum> checksums = new ArrayList<>( checksumsAlgorithms.size() );
             for ( String algorithm : checksumsAlgorithms )
             {
                 checksums.add( Checksum.forLocation( location, algorithm ) );
             }
             return checksums;
         }
 
     }
 
     private static class Maven2RepositoryLayoutEx
         extends Maven2RepositoryLayout
     {
 
         protected Maven2RepositoryLayoutEx( List<String> checksumsAlgorithms )
         {
             super( checksumsAlgorithms );
         }
 
         @Override
         public List<Checksum> getChecksums( Artifact artifact, boolean upload, URI location )
         {
             if ( isSignature( artifact.getExtension() ) )
             {
                 return Collections.emptyList();
             }
             return super.getChecksums( artifact, upload, location );
         }
 
         private boolean isSignature( String extension )
         {
             return extension.endsWith( ".asc" );
         }
 
     }
 
 }