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
   *
   * 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.
   */
  
  package org.apache.ambari.server.serveraction.users;
  
  import java.io.FileWriter;
  import java.io.IOException;
  import java.nio.file.Files;
  import java.nio.file.Path;
  import java.nio.file.Paths;
  import java.nio.file.attribute.PosixFilePermission;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  import jakarta.inject.Inject;
  
  import org.apache.commons.csv.CSVFormat;
  import org.apache.commons.csv.CSVPrinter;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.google.inject.assistedinject.Assisted;
  import com.google.inject.assistedinject.AssistedInject;
  
  public class CsvFilePersisterService implements CollectionPersisterService<String, List<String>> {
  
    private static final Logger LOGGER = LoggerFactory.getLogger(CsvFilePersisterService.class);
    private String NEW_LINE_SEPARATOR = "\n";
  
    private String csvFile;
    private CSVPrinter csvPrinter;
    private FileWriter fileWriter;
  
    @AssistedInject
    public CsvFilePersisterService(@Assisted String csvFile) {
      this.csvFile = csvFile;
    }
  
    public Set<PosixFilePermission> getCsvPermissions() {
      Set<PosixFilePermission> permissionsSet = new HashSet<>();
      permissionsSet.add(PosixFilePermission.OWNER_READ);
      permissionsSet.add(PosixFilePermission.OWNER_WRITE);
      permissionsSet.add(PosixFilePermission.GROUP_READ);
      permissionsSet.add(PosixFilePermission.OTHERS_READ);
      return permissionsSet;
    }
  
    @Inject
    public void init() throws IOException {
  
      Path csv = Files.createFile(Paths.get(csvFile));
      Files.setPosixFilePermissions(Paths.get(csvFile), getCsvPermissions());
      fileWriter = new FileWriter(csv.toFile());
  
      csvPrinter = new CSVPrinter(fileWriter, CSVFormat.DEFAULT.withRecordSeparator(NEW_LINE_SEPARATOR));
    }
  
  
    @Override
    public boolean persist(Collection<List<String>> collectionData) {
  
      try {
        LOGGER.info("Persisting collection to csv file");
  
        csvPrinter.printRecords(collectionData);
  
        LOGGER.info("Collection successfully persisted to csv file.");
  
        return true;
      } catch (IOException e) {
        LOGGER.error("Failed to persist the collection to csv file", e);
        return false;
      } finally {
        try {
          fileWriter.flush();
          fileWriter.close();
          csvPrinter.close();
        } catch (IOException e) {
          LOGGER.error("Error while flushing/closing fileWriter/csvPrinter", e);
        }
      }
    }
  
    @Override
    public boolean persistMap(Map<String, List<String>> mapData) {
  
      LOGGER.info("Persisting map data to csv file");
      Collection<List<String>> collectionData = new ArrayList<>();
  
      for (String key : mapData.keySet()) {
        List<String> record = new ArrayList<>();
        record.add(key);
        record.addAll(mapData.get(key));
        collectionData.add(record);
      }
  
      return persist(collectionData);
    }
  
  }
  