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.mathsfunc.operator;
  
  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.ItemNumOp;
  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.BigDecimal;
  import java.math.BigInteger;
  import java.util.List;
  
  public class ItemFuncMod extends ItemNumOp {
  
      public ItemFuncMod(Item a, Item b, int charsetIndex) {
          super(a, b, charsetIndex);
      }
  
      @Override
      public final String funcName() {
          return "%";
      }
  
      @Override
      public void fixLengthAndDec() {
          super.fixLengthAndDec();
          maybeNull = true;
      }
  
      @Override
      public BigDecimal realOp() {
          BigDecimal val0 = args.get(0).valReal();
          BigDecimal val1 = args.get(1).valReal();
          if (this.nullValue = (args.get(0).isNull() || args.get(1).isNull()))
              return BigDecimal.ZERO;
          if (val1.compareTo(BigDecimal.ZERO) == 0) {
              signalDivideByNull();
              return BigDecimal.ZERO;
          }
          BigInteger tmp = val0.toBigInteger().divide(val1.toBigInteger());
          BigDecimal tmpBd = new BigDecimal(tmp.multiply(val1.toBigInteger()));
          return val0.subtract(tmpBd);
  
      }
  
      @Override
      public BigInteger intOp() {
          if (this.nullValue)
              return BigInteger.ZERO;
          BigInteger v0 = args.get(0).valInt();
          BigInteger v1 = args.get(1).valInt();
          if (v1.equals(BigInteger.ZERO)) {
              signalDivideByNull();
              return BigInteger.ZERO;
          }
          return v0.divide(v1);
      }
  
      @Override
      public BigDecimal decimalOp() {
          if (this.nullValue)
              return new BigDecimal(0);
          BigDecimal val0 = args.get(0).valDecimal();
          BigDecimal val1 = args.get(1).valDecimal();
          if (val1.compareTo(BigDecimal.ZERO) == 0) {
              signalDivideByNull();
              return null;
          }
          BigInteger tmp = val0.toBigInteger().divide(val0.toBigInteger());
          BigDecimal tmpBd = new BigDecimal(tmp.multiply(val0.toBigInteger()));
          return val0.subtract(tmpBd);
      }
  
      @Override
      public void resultPrecision() {
          decimals = Math.max(args.get(0).getDecimals(), args.get(1).getDecimals());
          maxLength = Math.max(args.get(0).getMaxLength(), args.get(1).getMaxLength());
      }
  
      @Override
      public SQLExpr toExpression() {
          return new SQLBinaryOpExpr(args.get(0).toExpression(), SQLBinaryOperator.Mod, 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 ItemFuncMod(newArgs.get(0), newArgs.get(1), charsetIndex);
      }
  
  }
  