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.io.File;
  import static java.util.Objects.requireNonNull;
  import java.util.SortedSet;
  import java.util.TreeSet;
  
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.artifact.Artifact;
  import org.eclipse.aether.metadata.Metadata;
  import org.eclipse.aether.repository.LocalArtifactRegistration;
  import org.eclipse.aether.repository.LocalArtifactRequest;
  import org.eclipse.aether.repository.LocalArtifactResult;
  import org.eclipse.aether.repository.LocalMetadataRegistration;
  import org.eclipse.aether.repository.LocalMetadataRequest;
  import org.eclipse.aether.repository.LocalMetadataResult;
  import org.eclipse.aether.repository.LocalRepository;
  import org.eclipse.aether.repository.LocalRepositoryManager;
  import org.eclipse.aether.repository.RemoteRepository;
  
  /**
   * A local repository manager that realizes the classical Maven 2.0 local repository.
   */
  class SimpleLocalRepositoryManager
      implements LocalRepositoryManager
  {
  
      private final LocalRepository repository;
  
      SimpleLocalRepositoryManager( File basedir )
      {
          this( basedir, "simple" );
      }
  
      SimpleLocalRepositoryManager( String basedir )
      {
          this( ( basedir != null ) ? new File( basedir ) : null, "simple" );
      }
  
      SimpleLocalRepositoryManager( File basedir, String type )
      {
          requireNonNull( basedir, "base directory cannot be null" );
          repository = new LocalRepository( basedir.getAbsoluteFile(), type );
      }
  
      public LocalRepository getRepository()
      {
          return repository;
      }
  
      String getPathForArtifact( Artifact artifact, boolean local )
      {
          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( '-' );
          if ( local )
          {
              path.append( artifact.getBaseVersion() );
          }
          else
          {
              path.append( artifact.getVersion() );
          }
  
          if ( artifact.getClassifier().length() > 0 )
          {
              path.append( '-' ).append( artifact.getClassifier() );
          }
  
          if ( artifact.getExtension().length() > 0 )
          {
              path.append( '.' ).append( artifact.getExtension() );
          }
  
         return path.toString();
     }
 
     public String getPathForLocalArtifact( Artifact artifact )
     {
         requireNonNull( artifact, "artifact cannot be null" );
         return getPathForArtifact( artifact, true );
     }
 
     public String getPathForRemoteArtifact( Artifact artifact, RemoteRepository repository, String context )
     {
         requireNonNull( artifact, "artifact cannot be null" );
         requireNonNull( repository, "repository cannot be null" );
         return getPathForArtifact( artifact, false );
     }
 
     public String getPathForLocalMetadata( Metadata metadata )
     {
         requireNonNull( metadata, "metadata cannot be null" );
         return getPath( metadata, "local" );
     }
 
     public String getPathForRemoteMetadata( Metadata metadata, RemoteRepository repository, String context )
     {
         requireNonNull( metadata, "metadata cannot be null" );
         requireNonNull( repository, "repository cannot be null" );
         return getPath( metadata, getRepositoryKey( repository, context ) );
     }
 
     String getRepositoryKey( RemoteRepository repository, String context )
     {
         String key;
 
         if ( repository.isRepositoryManager() )
         {
             // repository serves dynamic contents, take request parameters into account for key
 
             StringBuilder buffer = new StringBuilder( 128 );
 
             buffer.append( repository.getId() );
 
             buffer.append( '-' );
 
             SortedSet<String> subKeys = new TreeSet<>();
             for ( RemoteRepository mirroredRepo : repository.getMirroredRepositories() )
             {
                 subKeys.add( mirroredRepo.getId() );
             }
 
             SimpleDigest digest = new SimpleDigest();
             digest.update( context );
             for ( String subKey : subKeys )
             {
                 digest.update( subKey );
             }
             buffer.append( digest.digest() );
 
             key = buffer.toString();
         }
         else
         {
             // repository serves static contents, its id is sufficient as key
 
             key = repository.getId();
         }
 
         return key;
     }
 
     private String getPath( Metadata metadata, String repositoryKey )
     {
         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( insertRepositoryKey( metadata.getType(), repositoryKey ) );
 
         return path.toString();
     }
 
     private String insertRepositoryKey( String filename, String repositoryKey )
     {
         String result;
         int idx = filename.indexOf( '.' );
         if ( idx < 0 )
         {
             result = filename + '-' + repositoryKey;
         }
         else
         {
             result = filename.substring( 0, idx ) + '-' + repositoryKey + filename.substring( idx );
         }
         return result;
     }
 
     public LocalArtifactResult find( RepositorySystemSession session, LocalArtifactRequest request )
     {
         requireNonNull( session, "session cannot be null" );
         requireNonNull( request, "request cannot be null" );
         String path = getPathForArtifact( request.getArtifact(), false );
         File file = new File( getRepository().getBasedir(), path );
 
         LocalArtifactResult result = new LocalArtifactResult( request );
         if ( file.isFile() )
         {
             result.setFile( file );
             result.setAvailable( true );
         }
 
         return result;
     }
 
     public void add( RepositorySystemSession session, LocalArtifactRegistration request )
     {
         requireNonNull( session, "session cannot be null" );
         requireNonNull( request, "request cannot be null" );
         // noop
     }
 
     @Override
     public String toString()
     {
         return String.valueOf( getRepository() );
     }
 
     public LocalMetadataResult find( RepositorySystemSession session, LocalMetadataRequest request )
     {
         requireNonNull( session, "session cannot be null" );
         requireNonNull( request, "request cannot be null" );
         LocalMetadataResult result = new LocalMetadataResult( request );
 
         String path;
 
         Metadata metadata = request.getMetadata();
         String context = request.getContext();
         RemoteRepository remote = request.getRepository();
 
         if ( remote != null )
         {
             path = getPathForRemoteMetadata( metadata, remote, context );
         }
         else
         {
             path = getPathForLocalMetadata( metadata );
         }
 
         File file = new File( getRepository().getBasedir(), path );
         if ( file.isFile() )
         {
             result.setFile( file );
         }
 
         return result;
     }
 
     public void add( RepositorySystemSession session, LocalMetadataRegistration request )
     {
         requireNonNull( session, "session cannot be null" );
         requireNonNull( request, "request cannot be null" );
         // noop
     }
 
 }