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.db2.visitor;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
  import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
  import com.alibaba.druid.sql.dialect.db2.ast.DB2Object;
  import com.alibaba.druid.sql.dialect.db2.ast.stmt.DB2CreateTableStatement;
  import com.alibaba.druid.sql.dialect.db2.ast.stmt.DB2SelectQueryBlock;
  import com.alibaba.druid.sql.dialect.db2.ast.stmt.DB2ValuesStatement;
  import com.alibaba.druid.sql.repository.SchemaRepository;
  import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
  
  public class DB2SchemaStatVisitor extends SchemaStatVisitor implements DB2ASTVisitor {
      public DB2SchemaStatVisitor() {
          super(DbType.db2);
      }
  
      public DB2SchemaStatVisitor(SchemaRepository repository) {
          super(repository);
      }
  
      @Override
      public boolean visit(DB2SelectQueryBlock x) {
          return this.visit((SQLSelectQueryBlock) x);
      }
  
      @Override
      public void endVisit(DB2SelectQueryBlock x) {
          super.endVisit((SQLSelectQueryBlock) x);
      }
  
      @Override
      public boolean visit(DB2ValuesStatement x) {
          return false;
      }
  
      @Override
      public boolean visit(DB2CreateTableStatement x) {
          return visit((SQLCreateTableStatement) x);
      }
  
      @Override
      public void endVisit(DB2CreateTableStatement x) {
      }
  
      protected boolean isPseudoColumn(long hash64) {
          return hash64 == DB2Object.Constants.CURRENT_DATE
                  || hash64 == DB2Object.Constants.CURRENT_DATE2
                  || hash64 == DB2Object.Constants.CURRENT_TIME
                  || hash64 == DB2Object.Constants.CURRENT_SCHEMA;
      }
  }
  