/* * Copyright (C) 2016-2020 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 ItemFuncLeftShift extends ItemFuncBit { public ItemFuncLeftShift(Item a, Item b) { super(a, b); } @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.shiftLeft(shift) : BigInteger.ZERO; } @Override public SQLExpr toExpression() { return new SQLBinaryOpExpr(args.get(0).toExpression(), SQLBinaryOperator.LeftShift, 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 ItemFuncLeftShift(newArgs.get(0), newArgs.get(1)); } }