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 ItemFuncConcat extends ItemStrFunc {
  
      public ItemFuncConcat(List<Item> args, int charsetIndex) {
          super(args, charsetIndex);
      }
  
      @Override
      public final String funcName() {
          return "concat";
      }
  
      @Override
      public String valStr() {
          StringBuilder sb = new StringBuilder();
          for (Item arg : args) {
              if (arg.isNull()) {
                  this.nullValue = true;
                  return EMPTY;
              }
              String s = arg.valStr();
              sb.append(s);
          }
          return sb.toString();
      }
  
      @Override
      public ItemFunc nativeConstruct(List<Item> realArgs) {
          return new ItemFuncConcat(realArgs, charsetIndex);
      }
  }
  