content: /**
   * 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
   * <p>
   * http://www.apache.org/licenses/LICENSE-2.0
   * <p>
   * 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.
   */
  
  package org.apache.atlas.repository.impexp;
  
  import org.apache.atlas.exception.AtlasBaseException;
  import org.apache.atlas.model.instance.AtlasEntity;
  import org.apache.atlas.model.instance.AtlasObjectId;
  import org.apache.atlas.model.instance.EntityMutationResponse;
  import org.apache.atlas.repository.store.graph.v2.AtlasEntityStoreV2;
  import org.apache.atlas.repository.store.graph.v2.AtlasEntityStream;
  import org.apache.atlas.type.AtlasEntityType;
  import org.apache.atlas.type.AtlasTypeRegistry;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Component;
  
  import javax.inject.Inject;
  
  import java.util.HashMap;
  import java.util.Map;
  
  import static org.apache.atlas.repository.impexp.AuditsWriter.getCurrentClusterName;
  
  @Component
  public class HdfsPathEntityCreator {
      protected static final Logger LOG = LoggerFactory.getLogger(HdfsPathEntityCreator.class);
  
      public static final String HDFS_PATH_TYPE                        = "hdfs_path";
      public static final String HDFS_PATH_ATTRIBUTE_NAME_NAME         = "name";
      public static final String HDFS_PATH_ATTRIBUTE_NAME_CLUSTER_NAME = "clusterName";
      public static final String HDFS_PATH_ATTRIBUTE_NAME_PATH         = "path";
      public static final String HDFS_PATH_ATTRIBUTE_QUALIFIED_NAME    = "qualifiedName";
  
      private static final String QUALIFIED_NAME_FORMAT = "%s@%s";
      private static final String PATH_SEPARATOR        = "/";
  
      private final AtlasTypeRegistry  typeRegistry;
      private final AtlasEntityStoreV2 entityStore;
  
      @Inject
      public HdfsPathEntityCreator(AtlasTypeRegistry typeRegistry, AtlasEntityStoreV2 entityStore) {
          this.typeRegistry = typeRegistry;
          this.entityStore  = entityStore;
      }
  
      public static String getQualifiedName(String path, String clusterName) {
          return String.format(QUALIFIED_NAME_FORMAT, path, clusterName);
      }
  
      public AtlasEntity.AtlasEntityWithExtInfo getCreateEntity(AtlasObjectId item) throws AtlasBaseException {
          if (item.getUniqueAttributes() == null || !item.getUniqueAttributes().containsKey(HDFS_PATH_ATTRIBUTE_NAME_PATH)) {
              return null;
          }
  
          return getCreateEntity((String) item.getUniqueAttributes().get(HDFS_PATH_ATTRIBUTE_NAME_PATH));
      }
  
      public AtlasEntity.AtlasEntityWithExtInfo getCreateEntity(String path) throws AtlasBaseException {
          return getCreateEntity(path, getCurrentClusterName());
      }
  
      public AtlasEntity.AtlasEntityWithExtInfo getCreateEntity(String path, String clusterName) throws AtlasBaseException {
          String                             pathWithTrailingSeparator = getPathWithTrailingSeparator(path);
          AtlasEntityType                    hdfsPathEntityType        = getHdfsPathEntityType();
          AtlasEntity.AtlasEntityWithExtInfo entityWithExtInfo         = getHDFSPathEntity(hdfsPathEntityType, pathWithTrailingSeparator, clusterName);
  
          if (entityWithExtInfo != null) {
              return entityWithExtInfo;
          }
  
          AtlasEntity            entity                 = createHDFSPathEntity(hdfsPathEntityType, pathWithTrailingSeparator, clusterName);
          AtlasEntityStream      entityStream           = new AtlasEntityStream(entity);
          EntityMutationResponse entityMutationResponse = entityStore.createOrUpdate(entityStream, false);
  
          if (entityMutationResponse.getCreatedEntities().isEmpty()) {
              return null;
          }
  
          return getHDFSPathEntity(hdfsPathEntityType, pathWithTrailingSeparator, clusterName);
      }
  
      private AtlasEntity createHDFSPathEntity(AtlasEntityType hdfsPathEntityType, String path, String clusterName) {
          AtlasEntity entity = hdfsPathEntityType.createDefaultValue();
  
          entity.setAttribute(HDFS_PATH_ATTRIBUTE_QUALIFIED_NAME, getQualifiedName(path, clusterName));
          entity.setAttribute(HDFS_PATH_ATTRIBUTE_NAME_PATH, path);
          entity.setAttribute(HDFS_PATH_ATTRIBUTE_NAME_NAME, path);
          entity.setAttribute(HDFS_PATH_ATTRIBUTE_NAME_CLUSTER_NAME, clusterName);
  
          return entity;
      }
  
      private AtlasEntity.AtlasEntityWithExtInfo getHDFSPathEntity(AtlasEntityType hdfsPathEntityType, String path, String clusterName) {
          try {
              return entityStore.getByUniqueAttributes(hdfsPathEntityType, getUniqueAttributes(path, clusterName));
          } catch (AtlasBaseException e) {
              return null;
          }
      }
  
      private AtlasEntityType getHdfsPathEntityType() throws AtlasBaseException {
          return (AtlasEntityType) typeRegistry.getType(HDFS_PATH_TYPE);
      }
  
      private Map<String, Object> getUniqueAttributes(String path, String clusterName) {
          Map<String, Object> ret = new HashMap<>();
  
          ret.put(HDFS_PATH_ATTRIBUTE_QUALIFIED_NAME, getQualifiedName(path, clusterName));
  
          return ret;
      }
  
      private String getPathWithTrailingSeparator(String path) {
          if (path.endsWith(PATH_SEPARATOR)) {
              return path;
          }
  
          return path + PATH_SEPARATOR;
      }
  }
  