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.converters;
  
  import org.apache.atlas.AtlasErrorCode;
  import org.apache.atlas.exception.AtlasBaseException;
  import org.apache.atlas.model.TypeCategory;
  import org.apache.atlas.model.instance.AtlasClassification;
  import org.apache.atlas.model.instance.AtlasEntity;
  import org.apache.atlas.model.instance.AtlasEntity.Status;
  import org.apache.atlas.model.instance.AtlasObjectId;
  import org.apache.atlas.type.AtlasClassificationType;
  import org.apache.atlas.type.AtlasEntityType;
  import org.apache.atlas.type.AtlasType;
  import org.apache.atlas.type.AtlasTypeRegistry;
  import org.apache.atlas.v1.model.instance.AtlasSystemAttributes;
  import org.apache.atlas.v1.model.instance.Id;
  import org.apache.atlas.v1.model.instance.Referenceable;
  import org.apache.atlas.v1.model.instance.Struct;
  import org.apache.commons.collections.CollectionUtils;
  import org.apache.commons.collections.MapUtils;
  import org.apache.commons.lang3.StringUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  public class AtlasEntityFormatConverter extends AtlasStructFormatConverter {
      private static final Logger LOG = LoggerFactory.getLogger(AtlasEntityFormatConverter.class);
  
      public AtlasEntityFormatConverter(AtlasFormatConverters registry, AtlasTypeRegistry typeRegistry) {
          super(registry, typeRegistry, TypeCategory.ENTITY);
      }
  
      @Override
      public boolean isValidValueV1(Object v1Obj, AtlasType type) {
          boolean ret = (v1Obj == null) || v1Obj instanceof Id || v1Obj instanceof Referenceable;
  
          if (LOG.isDebugEnabled()) {
              LOG.debug("AtlasEntityFormatConverter.isValidValueV1(type={}, value={}): {}", (v1Obj != null ? v1Obj.getClass().getCanonicalName() : null), v1Obj, ret);
          }
  
          return ret;
      }
  
      @Override
      public AtlasEntity fromV1ToV2(Object v1Obj, AtlasType type, ConverterContext context) throws AtlasBaseException {
          AtlasEntity entity = null;
  
          if (v1Obj != null) {
              AtlasEntityType entityType = (AtlasEntityType) type;
  
              if (v1Obj instanceof Referenceable) {
                  Referenceable entRef = (Referenceable) v1Obj;
  
                  String guid = entRef.getId().getId();
  
                  if (!context.entityExists(guid)) {
                      entity = new AtlasEntity(entRef.getTypeName(), super.fromV1ToV2(entityType, entRef.getValues(), context));
  
                      entity.setGuid(entRef.getId().getId());
                      entity.setStatus(convertState(entRef.getId().getState()));
  
                      if (entRef.getSystemAttributes() != null) {
                          entity.setCreatedBy(entRef.getSystemAttributes().getCreatedBy());
                          entity.setCreateTime(entRef.getSystemAttributes().getCreatedTime());
                          entity.setUpdatedBy(entRef.getSystemAttributes().getModifiedBy());
                          entity.setUpdateTime(entRef.getSystemAttributes().getModifiedTime());
                      }
  
                      entity.setVersion((long) entRef.getId().getVersion());
  
                      if (CollectionUtils.isNotEmpty(entRef.getTraitNames())) {
                          List<AtlasClassification> classifications = new ArrayList<>();
                          AtlasFormatConverter      traitConverter  = converterRegistry.getConverter(TypeCategory.CLASSIFICATION);
  
                          for (String traitName : entRef.getTraitNames()) {
                              Struct              trait          = entRef.getTraits().get(traitName);
                              AtlasType           classifiType   = typeRegistry.getType(traitName);
                              AtlasClassification classification = (AtlasClassification) traitConverter.fromV1ToV2(trait, classifiType, context);
  
                              classifications.add(classification);
                          }
  
                          entity.setClassifications(classifications);
                      }
                  }
              } else {
                  throw new AtlasBaseException(AtlasErrorCode.UNEXPECTED_TYPE, "Referenceable",
                          v1Obj.getClass().getCanonicalName());
              }
          }
          return entity;
      }
  
      @Override
      public Object fromV2ToV1(Object v2Obj, AtlasType type, ConverterContext context) throws AtlasBaseException {
          Object ret = null;
  
          if (v2Obj != null) {
              AtlasEntityType entityType = (AtlasEntityType) type;
  
              if (v2Obj instanceof Map) {
                  Map<?, ?> v2Map    = (Map<?, ?>) v2Obj;
                  String    idStr    = (String) v2Map.get(AtlasObjectId.KEY_GUID);
                  String    typeName = type.getTypeName();
  
                  if (StringUtils.isEmpty(idStr)) {
                      throw new AtlasBaseException(AtlasErrorCode.INSTANCE_GUID_NOT_FOUND);
                  }
  
                  final Map<String, Object> v2Attribs = (Map<String, Object>) v2Map.get(ATTRIBUTES_PROPERTY_KEY);
  
                  if (MapUtils.isEmpty(v2Attribs)) {
                      ret = new Id(idStr, 0, typeName);
                  } else {
                      ret = new Referenceable(idStr, typeName, super.fromV2ToV1(entityType, v2Attribs, context));
                  }
              } else if (v2Obj instanceof AtlasEntity) {
                  AtlasEntity entity = (AtlasEntity) v2Obj;
                  Status      status = entity.getStatus();
  
                  if (status == null) {
                      status = Status.ACTIVE;
                  }
  
                  final Map<String, Object> v2Attribs = entity.getAttributes();
  
                  Referenceable referenceable = new Referenceable(entity.getGuid(), entity.getTypeName(), status.name(),
                          fromV2ToV1(entityType, v2Attribs, context),
                          new AtlasSystemAttributes(entity.getCreatedBy(), entity.getUpdatedBy(), entity.getCreateTime(), entity.getUpdateTime()));
  
                  if (CollectionUtils.isNotEmpty(entity.getClassifications())) {
                      for (AtlasClassification classification : entity.getClassifications()) {
                          String                  traitName          = classification.getTypeName();
                          AtlasClassificationType classificationType = typeRegistry.getClassificationTypeByName(traitName);
                          AtlasFormatConverter    formatConverter    = classificationType != null ? converterRegistry.getConverter(classificationType.getTypeCategory()) : null;
                          Struct                  trait              = formatConverter != null ? (Struct) formatConverter.fromV2ToV1(classification, classificationType, context) : null;
  
                          if (trait != null) {
                              referenceable.getTraitNames().add(trait.getTypeName());
                              referenceable.getTraits().put(trait.getTypeName(), trait);
                          }
                      }
                  }
  
                  ret = referenceable;
              } else if (v2Obj instanceof AtlasObjectId) { // transient-id
                  AtlasEntity entity = context.getById(((AtlasObjectId) v2Obj).getGuid());
                  if (entity == null) {
                      throw new AtlasBaseException(AtlasErrorCode.INVALID_PARAMETERS, "Could not find entity ",
                              v2Obj.toString());
                  }
                  ret = this.fromV2ToV1(entity, typeRegistry.getType(((AtlasObjectId) v2Obj).getTypeName()), context);
              } else {
                  throw new AtlasBaseException(AtlasErrorCode.UNEXPECTED_TYPE, "Map or AtlasEntity or String",
                          v2Obj.getClass().getCanonicalName());
              }
          }
          return ret;
      }
  
      private Status convertState(Id.EntityState state) {
          return (state != null && state.equals(Id.EntityState.DELETED)) ? Status.DELETED : Status.ACTIVE;
      }
  }
  