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.field.Field;
  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.operator.ItemBoolFunc2;
  import com.actiontech.dble.util.CompareLike;
  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 ItemFuncLike extends ItemBoolFunc2 {
      private Item escape;
      private boolean isNot;
  
      public ItemFuncLike(Item a, Item b, Item escape, boolean isNot, int charsetIndex) {
          super(a, b, charsetIndex);
          this.escape = escape;
          if (escape != null)
              args.add(escape);
          this.isNot = isNot;
      }
  
      @Override
      public final String funcName() {
          return isNot ? "not like " : "like";
      }
  
      public ItemFunc.Functype functype() {
          return ItemFunc.Functype.LIKE_FUNC;
      }
  
      @Override
      public BigInteger valInt() {
          if (args.get(0).isNull()) {
              this.nullValue = true;
              return BigInteger.ZERO;
          }
          String str2 = args.get(1).valStr();
          if (args.get(1).isNull()) {
              this.nullValue = true;
              return BigInteger.ZERO;
          }
          String escapeStr = null;
          if (escape != null)
              escapeStr = escape.valStr();
          this.nullValue = false;
          CompareLike like = null;
          if (escapeStr == null)
              like = new CompareLike(str2);
          else
              like = new CompareLike(str2, escapeStr);
  
          String str = args.get(0).valStr();
          boolean isLike = like.compare(str);
          return isNot ? (isLike ? BigInteger.ZERO : BigInteger.ONE) : (isLike ? BigInteger.ONE : BigInteger.ZERO);
      }
  
      @Override
      public SQLExpr toExpression() {
          SQLExpr comparee = args.get(0).toExpression();
          SQLExpr pattern = args.get(1).toExpression();
          SQLExpr escapeExpr = this.escape == null ? null : this.escape.toExpression();
          SQLBinaryOpExpr like = null;
          if (isNot) {
              like = new SQLBinaryOpExpr(comparee, SQLBinaryOperator.NotLike, pattern);
          } else {
              like = new SQLBinaryOpExpr(comparee, SQLBinaryOperator.Like, pattern);
          }
          if (escapeExpr == null) {
              return like;
          } else {
              return new SQLBinaryOpExpr(like, SQLBinaryOperator.Escape, escapeExpr);
          }
      }
  
      @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 ItemFuncLike(newArgs.get(0), newArgs.get(1), escape == null ? null : newArgs.get(2), this.isNot, this.charsetIndex);
      }
  
  }
  