content: package org.apache.archiva.metadata.repository;
  
  /*
   * 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 org.apache.archiva.metadata.model.ArtifactMetadata;
  import org.apache.archiva.metadata.model.ProjectVersionMetadata;
  import org.apache.archiva.metadata.model.ProjectVersionReference;
  import org.apache.archiva.repository.Repository;
  import org.apache.archiva.repository.RepositoryType;
  
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.List;
  
  public interface MetadataResolver
  {
      default List<RepositoryType> supportsRepositoryTypes() {
          return Arrays.asList( RepositoryType.MAVEN );
      }
  
      ProjectVersionMetadata resolveProjectVersion( RepositorySession session, String repoId, String namespace,
                                                    String projectId, String projectVersion )
          throws MetadataResolutionException;
  
      /**
       * Retrieve project references from the metadata repository. Note that this is not built into the content model for
       * a project version as a reference may be present (due to reverse-lookup of dependencies) before the actual
       * project is, and we want to avoid adding a stub model to the content repository.
       *
       * @param repoId         the repository ID to look within
       * @param namespace      the namespace of the project to get references to
       * @param projectId      the identifier of the project to get references to
       * @param projectVersion the version of the project to get references to
       * @return a list of project references
       */
      Collection<ProjectVersionReference> resolveProjectReferences( RepositorySession session, String repoId,
                                                                    String namespace, String projectId,
                                                                    String projectVersion )
          throws MetadataResolutionException;
  
      Collection<String> resolveRootNamespaces( RepositorySession session, String repoId )
          throws MetadataResolutionException;
  
      Collection<String> resolveNamespaces( RepositorySession session, String repoId, String namespace )
          throws MetadataResolutionException;
  
      Collection<String> resolveProjects( RepositorySession session, String repoId, String namespace )
          throws MetadataResolutionException;
  
      Collection<String> resolveProjectVersions( RepositorySession session, String repoId, String namespace,
                                                 String projectId )
          throws MetadataResolutionException;
  
      Collection<ArtifactMetadata> resolveArtifacts( RepositorySession session, String repoId, String namespace,
                                                     String projectId, String projectVersion )
          throws MetadataResolutionException;
  }
  