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.cassandra.tools.nodetool.stats;
  
  import java.io.PrintStream;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.cassandra.tools.nodetool.formatter.TableBuilder;
  
  /**
   * Printer for GC statistics.
   */
  public class GcStatsPrinter
  {
      /**
       * Factory method to get a printer based on the format.
       *
       * @param format The desired output format (e.g., json, yaml).
       * @return A StatsPrinter appropriate for the format.
       */
      public static StatsPrinter<GcStatsHolder> from(String format)
      {
          switch (format)
          {
              case "json":
                  return new StatsPrinter.JsonPrinter<>();
              case "yaml":
                  return new StatsPrinter.YamlPrinter<>();
              case "table":
                  return new TablePrinter();
              default:
                  return new LegacyPrinter();
          }
      }
  
      public static class TablePrinter implements StatsPrinter<GcStatsHolder>
      {
          /**
           * Prints GC statistics in a human-readable table format.
           *
           * @param data The GC statistics data holder.
           * @param out  The output stream to print to.
           */
          @Override
          public void print(GcStatsHolder data, PrintStream out)
          {
              Map<String, Object> stats = data.convert2Map();
              TableBuilder tableBuilder = new TableBuilder();
  
              for (Map.Entry<String, Object> entry : stats.entrySet())
                  tableBuilder.add(GcStatsHolder.columnDescriptionMap.get(entry.getKey()), entry.getValue().toString());
  
              tableBuilder.printTo(out);
          }
      }
  
      /**
       * Default printer for GC statistics.
       */
      public static class LegacyPrinter implements StatsPrinter<GcStatsHolder>
      {
          @Override
          public void print(GcStatsHolder data, PrintStream out)
          {
              Map<String, Object> stats = data.convert2Map();
              TableBuilder tableBuilder = new TableBuilder();
  
              tableBuilder.add(new ArrayList<>(GcStatsHolder.columnDescriptionMap.values()));
  
              List<String> values = new ArrayList<>();
              for (String key : GcStatsHolder.columnDescriptionMap.keySet())
                  values.add(stats.get(key).toString());
  
              tableBuilder.add(values);
  
              tableBuilder.printTo(out);
          }
      }
  }