content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  
  package com.actiontech.dble.plan.common.item.function.strfunc;
  
  import com.actiontech.dble.plan.common.item.Item;
  import com.actiontech.dble.plan.common.item.function.ItemFunc;
  
  import java.util.List;
  
  
  public class ItemFuncElt extends ItemStrFunc {
  
      public ItemFuncElt(List<Item> args, int charsetIndex) {
          super(args, charsetIndex);
      }
  
      @Override
      public final String funcName() {
          return "elt";
      }
  
      @Override
      public String valStr() {
          long l = args.get(0).valInt().longValue();
          if (l < 1 || l >= args.size()) {
              this.nullValue = true;
              return EMPTY;
          }
          Item arg = args.get((int) l);
          if (arg.isNull()) {
              this.nullValue = true;
              return EMPTY;
          } else {
              return arg.valStr();
          }
      }
  
      @Override
      public ItemFunc nativeConstruct(List<Item> realArgs) {
          return new ItemFuncElt(realArgs, charsetIndex);
      }
  }
  