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.odps.ast;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.SQLUtils;
  import com.alibaba.druid.sql.ast.SQLLimit;
  import com.alibaba.druid.sql.ast.SQLZOrderBy;
  import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
  import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
  import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
  import com.alibaba.druid.sql.dialect.odps.visitor.OdpsASTVisitor;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  import java.util.ArrayList;
  
  public class OdpsSelectQueryBlock extends SQLSelectQueryBlock {
      private SQLZOrderBy zOrderBy;
  
      public OdpsSelectQueryBlock() {
          dbType = DbType.odps;
  
          clusterBy = new ArrayList<SQLSelectOrderByItem>();
          distributeBy = new ArrayList<SQLSelectOrderByItem>();
          sortBy = new ArrayList<SQLSelectOrderByItem>(2);
      }
  
      public OdpsSelectQueryBlock clone() {
          OdpsSelectQueryBlock x = new OdpsSelectQueryBlock();
          cloneTo(x);
          return x;
      }
  
      @Override
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor instanceof OdpsASTVisitor) {
              accept0((OdpsASTVisitor) visitor);
              return;
          }
  
          super.accept0(visitor);
      }
  
      public void accept0(OdpsASTVisitor visitor) {
          if (visitor.visit(this)) {
              acceptChild(visitor, this.hints);
              acceptChild(visitor, this.selectList);
              acceptChild(visitor, this.from);
              acceptChild(visitor, this.where);
              acceptChild(visitor, this.groupBy);
              acceptChild(visitor, this.orderBy);
              acceptChild(visitor, this.zOrderBy);
              acceptChild(visitor, this.clusterBy);
              acceptChild(visitor, this.distributeBy);
              acceptChild(visitor, this.sortBy);
              acceptChild(visitor, this.limit);
              acceptChild(visitor, this.into);
          }
  
          visitor.endVisit(this);
      }
  
      public String toString() {
          return SQLUtils.toOdpsString(this);
      }
  
      public void limit(int rowCount, int offset) {
          if (offset > 0) {
              throw new UnsupportedOperationException("not support offset");
          }
  
          setLimit(new SQLLimit(new SQLIntegerExpr(rowCount)));
      }
  
      public SQLZOrderBy getZOrderBy() {
          return zOrderBy;
      }
  
      public void setZOrderBy(SQLZOrderBy x) {
          if (x != null) {
              x.setParent(this);
          }
  
          this.zOrderBy = x;
      }
  }
  