package org.apache.maven.project.artifact;
   
   /*
    * 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.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashSet;
  import java.util.LinkedHashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Objects;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  
  import org.apache.maven.RepositoryUtils;
  import org.apache.maven.artifact.Artifact;
  import org.apache.maven.lifecycle.LifecycleExecutionException;
  import org.apache.maven.project.MavenProject;
  import org.codehaus.plexus.component.annotations.Component;
  import org.eclipse.aether.RepositorySystemSession;
  import org.eclipse.aether.repository.LocalRepository;
  import org.eclipse.aether.repository.RemoteRepository;
  import org.eclipse.aether.repository.WorkspaceRepository;
  
  /**
   * @author Igor Fedorenko
   * @author Benjamin Bentmann
   * @author Anton Tanasenko
   */
  @Component( role = ProjectArtifactsCache.class )
  public class DefaultProjectArtifactsCache
      implements ProjectArtifactsCache
  {
      /**
       * CacheKey
       */
      protected static class CacheKey
          implements Key
      {
  
          private final String groupId;
          
          private final String artifactId;
          
          private final String version;
          
          private final Set<String> dependencyArtifacts;
  
          private final WorkspaceRepository workspace;
  
          private final LocalRepository localRepo;
  
          private final List<RemoteRepository> repositories;
          
          private final Set<String> collect;
          
          private final Set<String> resolve;
          
          private boolean aggregating;
  
          private final int hashCode;
  
          public CacheKey( MavenProject project, List<RemoteRepository> repositories,
              Collection<String> scopesToCollect, Collection<String> scopesToResolve, boolean aggregating,
              RepositorySystemSession session )
          {
              
              groupId = project.getGroupId();
              artifactId = project.getArtifactId();
              version = project.getVersion();
              
              Set<String> deps = new LinkedHashSet<>();
              if ( project.getDependencyArtifacts() != null )
              {
                for ( Artifact dep: project.getDependencyArtifacts() )
                {
                  deps.add( dep.toString() );
                }
              }
              dependencyArtifacts = Collections.unmodifiableSet( deps );
              
             workspace = RepositoryUtils.getWorkspace( session );
             this.localRepo = session.getLocalRepository();
             this.repositories = new ArrayList<>( repositories.size() );
             for ( RemoteRepository repository : repositories )
             {
                 if ( repository.isRepositoryManager() )
                 {
                     this.repositories.addAll( repository.getMirroredRepositories() );
                 }
                 else
                 {
                     this.repositories.add( repository );
                 }
             }
             collect = scopesToCollect == null
                 ? Collections.<String>emptySet() 
                 : Collections.unmodifiableSet( new HashSet<>( scopesToCollect ) );
             resolve = scopesToResolve == null 
                 ? Collections.<String>emptySet() 
                 : Collections.unmodifiableSet( new HashSet<>( scopesToResolve ) );
             this.aggregating = aggregating;
 
             int hash = 17;
             hash = hash * 31 + Objects.hashCode( groupId );
             hash = hash * 31 + Objects.hashCode( artifactId );
             hash = hash * 31 + Objects.hashCode( version );
             hash = hash * 31 + Objects.hashCode( dependencyArtifacts );
             hash = hash * 31 + Objects.hashCode( workspace );
             hash = hash * 31 + Objects.hashCode( localRepo );
             hash = hash * 31 + RepositoryUtils.repositoriesHashCode( repositories );
             hash = hash * 31 + Objects.hashCode( collect );
             hash = hash * 31 + Objects.hashCode( resolve );
             hash = hash * 31 + Objects.hashCode( aggregating );
             this.hashCode = hash;
         }
 
         @Override
         public String toString()
         {
             return groupId + ":" + artifactId + ":" + version;
         }
 
         @Override
         public int hashCode()
         {
             return hashCode;
         }
 
         @Override
         public boolean equals( Object o )
         {
             if ( o == this )
             {
                 return true;
             }
 
             if ( !( o instanceof CacheKey ) )
             {
                 return false;
             }
 
             CacheKey that = (CacheKey) o;
 
             return Objects.equals( groupId, that.groupId ) && Objects.equals( artifactId, that.artifactId )
                 && Objects.equals( version, that.version )
                 && Objects.equals( dependencyArtifacts, that.dependencyArtifacts )
                 && Objects.equals( workspace, that.workspace ) 
                 && Objects.equals( localRepo, that.localRepo )
                 && RepositoryUtils.repositoriesEquals( repositories, that.repositories )
                 && Objects.equals( collect, that.collect ) 
                 && Objects.equals( resolve, that.resolve )
                 && aggregating == that.aggregating;
         }
     }
 
     protected final Map<Key, CacheRecord> cache = new ConcurrentHashMap<>();
 
     @Override
     public Key createKey( MavenProject project, Collection<String> scopesToCollect,
         Collection<String> scopesToResolve, boolean aggregating, RepositorySystemSession session )
     {
         return new CacheKey( project, project.getRemoteProjectRepositories(), scopesToCollect, scopesToResolve, 
             aggregating, session );
     }
 
     @Override
     public CacheRecord get( Key key )
         throws LifecycleExecutionException
     {
         CacheRecord cacheRecord = cache.get( key );
 
         if ( cacheRecord != null && cacheRecord.getException() != null )
         {
             throw cacheRecord.getException();
         }
 
         return cacheRecord;
     }
 
     @Override
     public CacheRecord put( Key key, Set<Artifact> projectArtifacts )
     {
         Objects.requireNonNull( projectArtifacts, "projectArtifacts cannot be null" );
 
         assertUniqueKey( key );
 
         CacheRecord record =
             new CacheRecord( Collections.unmodifiableSet( new LinkedHashSet<>( projectArtifacts ) ) );
 
         cache.put( key, record );
 
         return record;
     }
 
     protected void assertUniqueKey( Key key )
     {
         if ( cache.containsKey( key ) )
         {
             throw new IllegalStateException( "Duplicate artifact resolution result for project " + key );
         }
     }
 
     @Override
     public CacheRecord put( Key key, LifecycleExecutionException exception )
     {
         Objects.requireNonNull( exception, "exception cannot be null" );
 
         assertUniqueKey( key );
 
         CacheRecord record = new CacheRecord( exception );
 
         cache.put( key, record );
 
         return record;
     }
 
     @Override
     public void flush()
     {
         cache.clear();
     }
 
     @Override
     public void register( MavenProject project, Key cacheKey, CacheRecord record )
     {
         // default cache does not track record usage
     }
 
 }