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.convertfunc;
  
  import com.actiontech.dble.plan.common.field.Field;
  import com.actiontech.dble.plan.common.item.Item;
  import com.actiontech.dble.plan.common.item.function.timefunc.ItemDatetimeFunc;
  import com.actiontech.dble.plan.common.time.MySQLTime;
  import com.actiontech.dble.plan.common.time.MySQLTimestampType;
  import com.actiontech.dble.plan.common.time.MyTime;
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
  import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
  import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
  
  import java.util.ArrayList;
  import java.util.List;
  
  
  public class ItemDatetimeTypeConvert extends ItemDatetimeFunc {
      public ItemDatetimeTypeConvert(Item a, int charsetIndex) {
          super(new ArrayList<Item>(), charsetIndex);
          args.add(a);
      }
  
      public ItemDatetimeTypeConvert(Item a, int decArg, int charsetIndex) {
          super(new ArrayList<Item>(), charsetIndex);
          args.add(a);
          this.decimals = decArg;
      }
  
      @Override
      public final String funcName() {
          return "convert_as_datetime";
      }
  
      @Override
      public void fixLengthAndDec() {
          maybeNull = true;
      }
  
      @Override
      public boolean getDate(MySQLTime ltime, long fuzzyDate) {
          if ((nullValue = args.get(0).getDate(ltime, fuzzyDate | MyTime.TIME_NO_DATE_FRAC_WARN)))
              return true;
          assert (ltime.getTimeType() != MySQLTimestampType.MYSQL_TIMESTAMP_TIME);
          ltime.setTimeType(MySQLTimestampType.MYSQL_TIMESTAMP_DATETIME); // In
          // case
          // it
          // was
          // DATE
          return (nullValue = MyTime.myDatetimeRound(ltime, decimals));
      }
  
      @Override
      public SQLExpr toExpression() {
          SQLMethodInvokeExpr method = new SQLMethodInvokeExpr();
          method.setMethodName("CONVERT");
          method.addArgument(args.get(0).toExpression());
          if (decimals != NOT_FIXED_DEC) {
              SQLMethodInvokeExpr dataType = new SQLMethodInvokeExpr();
              dataType.setMethodName("DATETIME");
              dataType.addArgument(new SQLIntegerExpr(decimals));
              method.addArgument(dataType);
          } else {
              method.addArgument(new SQLIdentifierExpr("DATETIME"));
          }
          return method;
      }
  
      @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 ItemDatetimeTypeConvert(newArgs.get(0), this.decimals);
      }
  }
  