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.operator.cmpfunc;
  
  import com.actiontech.dble.plan.common.item.Item;
  import com.actiontech.dble.plan.common.item.function.ItemFunc;
  import com.actiontech.dble.plan.common.item.function.primary.ItemIntFunc;
  
  import java.math.BigInteger;
  import java.util.List;
  
  
  /*
   * INTERVAL(N,N1,N2,N3,...).
   */
  
  public class ItemFuncInterval extends ItemIntFunc {
  
      public ItemFuncInterval(List<Item> args, int charsetIndex) {
          super(args, charsetIndex);
      }
  
      @Override
      public final String funcName() {
          return "interval";
      }
  
      @Override
      public void fixLengthAndDec() {
          maybeNull = false;
          maxLength = 2;
      }
  
      @Override
      public BigInteger valInt() {
          BigInteger arg0 = args.get(0).valInt();
          if (args.get(0).isNullValue())
              return BigInteger.ONE.negate();
          int i = 0;
          for (i = 1; i < args.size(); i++) {
              BigInteger tmp = args.get(i).valInt();
              if (arg0.compareTo(tmp) < 0)
                  break;
          }
          return BigInteger.valueOf(i - 1);
      }
  
      @Override
      public int decimalPrecision() {
          return 2;
      }
  
      @Override
      public ItemFunc nativeConstruct(List<Item> realArgs) {
          return new ItemFuncInterval(realArgs, charsetIndex);
      }
  }
  