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.bitfunc;
  
  import com.actiontech.dble.plan.common.field.Field;
  import com.actiontech.dble.plan.common.item.Item;
  import com.actiontech.dble.plan.common.item.function.primary.ItemFuncBit;
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
  import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
  
  import java.math.BigInteger;
  import java.util.List;
  
  public class ItemFuncRightShift extends ItemFuncBit {
  
      public ItemFuncRightShift(Item a, Item b, int charsetIndex) {
          super(a, b, charsetIndex);
      }
  
      @Override
      public final String funcName() {
          return ">>";
      }
  
      @Override
      public BigInteger valInt() {
          if (args.get(0).isNullValue()) {
              nullValue = true; /* purecov: inspected */
              return BigInteger.ZERO; /* purecov: inspected */
          }
          int shift = args.get(1).valInt().intValue();
          if (args.get(1).isNullValue()) {
              nullValue = true;
              return BigInteger.ZERO;
          }
          nullValue = false;
  
          BigInteger arg1 = args.get(0).valInt();
          return shift < Long.SIZE * 8 ? arg1.shiftRight(shift) : BigInteger.ZERO;
      }
  
      @Override
      public SQLExpr toExpression() {
          return new SQLBinaryOpExpr(args.get(0).toExpression(), SQLBinaryOperator.RightShift, args.get(1).toExpression());
      }
  
      @Override
      protected Item cloneStruct(boolean forCalculate, List<Item> calArgs, boolean isPushDown, List<Field> fields) {
          List<Item> newArgs = null;
          if (!forCalculate)
              newArgs = cloneStructList(args);
          else
              newArgs = calArgs;
          return new ItemFuncRightShift(newArgs.get(0), newArgs.get(1), charsetIndex);
      }
  
  }
  