content: package com.alibaba.datax.plugin.reader.otsreader.utils;
  
  import com.alibaba.datax.common.util.Configuration;
  
  import java.util.List;
  
  public class ParamCheckerOld {
  
      private static void throwNotExistException(String key) {
          throw new IllegalArgumentException("The param '" + key + "' is not exist.");
      }
  
      private static void throwEmptyException(String key) {
          throw new IllegalArgumentException("The param  '" + key + "' is empty.");
      }
  
      private static void throwNotListException(String key) {
          throw new IllegalArgumentException("The param  '" + key + "' is not a json array.");
      }
  
      public static List<Object> checkListAndGet(Configuration param, String key, boolean isCheckEmpty) {
          List<Object> value = null;
          try {
              value = param.getList(key);
          } catch (ClassCastException e) {
              throwNotListException(key);
          }
          if (null == value) {
              throwNotExistException(key);
          } else if (isCheckEmpty && value.isEmpty()) {
              throwEmptyException(key);
          }
          return value;
      }
  
  }
  