content: /*
   * Copyright 1999-2017 Alibaba Group Holding Ltd.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.alibaba.druid.sql.ast.expr;
  
  import com.alibaba.druid.sql.ast.SQLDataType;
  import com.alibaba.druid.sql.ast.SQLObject;
  import com.alibaba.druid.sql.ast.statement.SQLCharacterDataType;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  public class SQLNCharExpr extends SQLTextLiteralExpr {
      private static SQLDataType defaultDataType = new SQLCharacterDataType("nvarchar");
  
      public SQLNCharExpr() {
      }
  
      public SQLNCharExpr(String text) {
          this.text = text;
      }
  
      public SQLNCharExpr(String text, SQLObject parent) {
          this.text = text;
          this.parent = parent;
      }
  
      public void output(StringBuilder buf) {
          if ((this.text == null) || (this.text.length() == 0)) {
              buf.append("NULL");
              return;
          }
  
          buf.append("N'");
          buf.append(this.text.replaceAll("'", "''"));
          buf.append("'");
      }
  
      protected void accept0(SQLASTVisitor visitor) {
          visitor.visit(this);
          visitor.endVisit(this);
      }
  
      public SQLNCharExpr clone() {
          return new SQLNCharExpr(text);
      }
  
      public SQLDataType computeDataType() {
          return defaultDataType;
      }
  }
  