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.impexp.AtlasExportResult;
  import org.apache.atlas.model.instance.AtlasEntity;
  import org.apache.atlas.model.typedef.AtlasTypesDef;
  import org.apache.atlas.type.AtlasType;
  import org.apache.commons.io.IOUtils;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.charset.StandardCharsets;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Set;
  import java.util.zip.ZipEntry;
  import java.util.zip.ZipOutputStream;
  
  public class ZipSink {
      private static final Logger LOG = LoggerFactory.getLogger(ZipSink.class);
  
      private static final String FILE_EXTENSION_JSON = ".json";
  
      final   Set<String>     guids = new HashSet<>();
      private ZipOutputStream zipOutputStream;
  
      public ZipSink(OutputStream outputStream) {
          zipOutputStream = new ZipOutputStream(outputStream);
      }
  
      public void add(AtlasEntity entity) throws AtlasBaseException {
          String jsonData = convertToJSON(entity);
  
          saveToZip(entity.getGuid(), jsonData);
          recordAddedEntityGuids(entity);
      }
  
      public void add(AtlasEntity.AtlasEntityWithExtInfo entityWithExtInfo) throws AtlasBaseException {
          String jsonData = convertToJSON(entityWithExtInfo);
  
          saveToZip(entityWithExtInfo.getEntity().getGuid(), jsonData);
          recordAddedEntityGuids(entityWithExtInfo);
      }
  
      public void setResult(AtlasExportResult result) throws AtlasBaseException {
          String jsonData = convertToJSON(result);
  
          saveToZip(ZipExportFileNames.ATLAS_EXPORT_INFO_NAME, jsonData);
      }
  
      public void setTypesDef(AtlasTypesDef typesDef) throws AtlasBaseException {
          String jsonData = convertToJSON(typesDef);
  
          saveToZip(ZipExportFileNames.ATLAS_TYPESDEF_NAME, jsonData);
      }
  
      public void setExportOrder(List<String> result) throws AtlasBaseException {
          String jsonData = convertToJSON(result);
  
          saveToZip(ZipExportFileNames.ATLAS_EXPORT_ORDER_NAME, jsonData);
      }
  
      public void close() {
          try {
              if (zipOutputStream != null) {
                  zipOutputStream.close();
                  zipOutputStream = null;
              }
          } catch (IOException e) {
              LOG.error("Error closing Zip file", e);
          }
      }
  
      public boolean hasEntity(String guid) {
          return guids.contains(guid);
      }
  
      public Set<String> getGuids() {
          return guids;
      }
  
      private String convertToJSON(Object entity) {
          return AtlasType.toJson(entity);
      }
  
      private void saveToZip(ZipExportFileNames fileName, String jsonData) throws AtlasBaseException {
          saveToZip(fileName.toString(), jsonData);
      }
  
      private void saveToZip(String fileName, String jsonData) throws AtlasBaseException {
          try {
              addToZipStream(fileName + FILE_EXTENSION_JSON, jsonData);
          } catch (IOException e) {
              throw new AtlasBaseException(String.format("Error writing file %s.", fileName), e);
          }
      }
  
      private void addToZipStream(String entryName, String payload) throws IOException {
          ZipEntry e = new ZipEntry(entryName);
  
          zipOutputStream.putNextEntry(e);
          writeBytes(payload);
          zipOutputStream.closeEntry();
      }
  
      private void writeBytes(String payload) throws IOException {
          IOUtils.copy(IOUtils.toInputStream(payload, StandardCharsets.UTF_8), zipOutputStream);
      }
  
      private void recordAddedEntityGuids(AtlasEntity.AtlasEntityWithExtInfo entityWithExtInfo) {
          guids.add(entityWithExtInfo.getEntity().getGuid());
  
          if (entityWithExtInfo.getReferredEntities() != null) {
              guids.addAll(entityWithExtInfo.getReferredEntities().keySet());
          }
      }
  
      private void recordAddedEntityGuids(AtlasEntity entity) {
          guids.add(entity.getGuid());
      }
  }
  