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.expr.SQLIdentifierExpr;
  import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleMultiInsertStatement;
  import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleMultiInsertStatement.InsertIntoClause;
  import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectTableReference;
  import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
  import com.alibaba.druid.wall.WallProvider;
  import com.alibaba.druid.wall.WallVisitor;
  import com.alibaba.druid.wall.violation.ErrorCode;
  import com.alibaba.druid.wall.violation.IllegalSQLObjectViolation;
  
  public class OracleWallVisitor extends WallVisitorBase implements WallVisitor, OracleASTVisitor {
      public OracleWallVisitor(WallProvider provider) {
          super(provider);
      }
  
      @Override
      public DbType getDbType() {
          return DbType.oracle;
      }
  
      public boolean visit(SQLIdentifierExpr x) {
          String name = x.getName();
          name = WallVisitorUtils.form(name);
          if (config.isVariantCheck() && config.getDenyVariants().contains(name)) {
              getViolations().add(new IllegalSQLObjectViolation(ErrorCode.VARIANT_DENY, "variable not allow : " + name,
                      toSQL(x)));
          }
          return true;
      }
  
      public boolean visit(OracleSelectTableReference x) {
          return WallVisitorUtils.check(this, x);
      }
  
      @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);
      }
  
      public boolean visit(InsertIntoClause x) {
          WallVisitorUtils.checkInsert(this, x);
  
          return true;
      }
  
      public boolean visit(OracleMultiInsertStatement x) {
          if (!config.isInsertAllow()) {
              this.getViolations().add(new IllegalSQLObjectViolation(ErrorCode.INSERT_NOT_ALLOW, "insert not allow",
                      this.toSQL(x)));
              return false;
          }
          WallVisitorUtils.initWallTopStatementContext();
  
          return true;
      }
  
      public void endVisit(OracleMultiInsertStatement x) {
          WallVisitorUtils.clearWallTopStatementContext();
      }
  }
  