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.wall.spi;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
  import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
  import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
  import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGDeleteStatement;
  import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGInsertStatement;
  import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGSelectQueryBlock;
  import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGUpdateStatement;
  import com.alibaba.druid.sql.dialect.postgresql.visitor.PGASTVisitor;
  import com.alibaba.druid.wall.WallProvider;
  import com.alibaba.druid.wall.WallVisitor;
  
  public class PGWallVisitor extends WallVisitorBase implements WallVisitor, PGASTVisitor {
      public PGWallVisitor(WallProvider provider) {
          super(provider);
      }
  
      @Override
      public DbType getDbType() {
          return DbType.postgresql;
      }
  
      @Override
      public boolean isDenyTable(String name) {
          if (!config.isTableCheck()) {
              return false;
          }
  
          name = WallVisitorUtils.form(name);
          if (name.startsWith("v$") || name.startsWith("v_$")) {
              return true;
          }
          return !this.provider.checkDenyTable(name);
      }
  
      @Override
      public boolean visit(PGSelectQueryBlock x) {
          WallVisitorUtils.checkSelect(this, x);
          return true;
      }
  
      @Override
      public boolean visit(PGDeleteStatement x) {
          WallVisitorUtils.checkReadOnly(this, x.getFrom());
          return visit((SQLDeleteStatement) x);
      }
  
      @Override
      public boolean visit(PGUpdateStatement x) {
          return visit((SQLUpdateStatement) x);
      }
  
      @Override
      public boolean visit(PGInsertStatement x) {
          return visit((SQLInsertStatement) x);
      }
  }
  