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.dialect.sqlserver.ast;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.ast.SQLTop;
  import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
  import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
  import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
  import com.alibaba.druid.sql.dialect.sqlserver.visitor.SQLServerASTVisitor;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SQLServerSelectQueryBlock extends SQLSelectQueryBlock {
      private SQLTop top;
      private List<SQLAssignItem> options = new ArrayList<>();
  
      public SQLServerSelectQueryBlock() {
          dbType = DbType.sqlserver;
      }
  
      public SQLTop getTop() {
          return top;
      }
  
      public List<SQLAssignItem> getOptions() {
          return options;
      }
  
      public void setTop(SQLTop top) {
          if (top != null) {
              top.setParent(this);
          }
          this.top = top;
      }
  
      public void setTop(int rowCount) {
          setTop(new SQLTop(new SQLIntegerExpr(rowCount)));
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor instanceof SQLServerASTVisitor) {
              accept0((SQLServerASTVisitor) visitor);
          } else {
              super.accept0(visitor);
          }
      }
  
      protected void accept0(SQLServerASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, this.top);
              acceptChild(visitor, this.selectList);
              acceptChild(visitor, this.from);
              acceptChild(visitor, this.where);
              acceptChild(visitor, this.groupBy);
          }
          visitor.endVisit(this);
      }
  
      public void limit(int rowCount, int offset) {
          if (offset <= 0) {
              setTop(rowCount);
          } else {
              throw new UnsupportedOperationException("not support offset");
          }
      }
  }
  