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.mysql.ast.statement;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.SQLUtils;
  import com.alibaba.druid.sql.ast.SQLExpr;
  import com.alibaba.druid.sql.ast.SQLName;
  import com.alibaba.druid.sql.ast.statement.SQLExplainStatement;
  import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
  import com.alibaba.druid.sql.visitor.SQLASTVisitor;
  
  public class MySqlExplainStatement extends SQLExplainStatement implements MySqlStatement {
      private boolean describe;
      private SQLName tableName;
      private SQLName columnName;
      private SQLExpr wild;
      private SQLExpr connectionId;
  
      private boolean distributeInfo; // for ads
  
      public MySqlExplainStatement() {
          super(DbType.mysql);
      }
  
      public MySqlExplainStatement(DbType dbType) {
          super(dbType);
      }
  
      @Override
      public void accept0(MySqlASTVisitor visitor) {
          if (visitor.visit(this)) {
              // tbl_name [col_name | wild]
              if (tableName != null) {
                  tableName.accept(visitor);
  
                  if (columnName != null) {
                      columnName.accept(visitor);
                  } else if (wild != null) {
                      wild.accept(visitor);
                  }
              } else {
                  // {explainable_stmt | FOR CONNECTION connection_id}
                  if (connectionId != null) {
                      connectionId.accept(visitor);
                  } else {
                      if (statement != null) {
                          statement.accept(visitor);
                      }
                  }
              }
          }
  
          visitor.endVisit(this);
      }
  
      protected void accept0(SQLASTVisitor visitor) {
          if (visitor instanceof MySqlASTVisitor) {
              accept0((MySqlASTVisitor) visitor);
          } else {
              super.accept0(visitor);
          }
      }
  
      public String toString() {
          return SQLUtils.toMySqlString(this);
      }
  
      public boolean isDescribe() {
          return describe;
      }
  
      public void setDescribe(boolean describe) {
          this.describe = describe;
      }
  
      public SQLName getTableName() {
          return tableName;
      }
  
      public void setTableName(SQLName tableName) {
          this.tableName = tableName;
      }
  
      public SQLName getColumnName() {
          return columnName;
      }
  
      public void setColumnName(SQLName columnName) {
          this.columnName = columnName;
      }
  
      public SQLExpr getWild() {
          return wild;
      }
  
      public void setWild(SQLExpr wild) {
          this.wild = wild;
      }
  
      public SQLExpr getConnectionId() {
          return connectionId;
      }
  
      public void setConnectionId(SQLExpr connectionId) {
          this.connectionId = connectionId;
      }
  
      public boolean isDistributeInfo() {
          return distributeInfo;
      }
  
      public void setDistributeInfo(boolean distributeInfo) {
          this.distributeInfo = distributeInfo;
      }
  }
  