content: /*
   * Copyright 1999-2018 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.nacos.plugin.datasource.enums.derby;
  
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * The TrustedSqlFunctionEnum enum class is used to enumerate and manage a list of trusted built-in SQL functions.
   * By using this enum, you can verify whether a given SQL function is part of the trusted functions list
   * to avoid potential SQL injection risks.
   *
   * @author blake.qiu
   */
  public enum TrustedDerbylFunctionEnum {
  
      /**
       * NOW().
       */
      NOW("NOW()", "CURRENT_TIMESTAMP");
  
      private static final Map<String, TrustedDerbylFunctionEnum> LOOKUP_MAP = new HashMap<>();
  
      static {
          for (TrustedDerbylFunctionEnum entry : TrustedDerbylFunctionEnum.values()) {
              LOOKUP_MAP.put(entry.functionName, entry);
          }
      }
  
      private final String functionName;
  
      private final String function;
  
      TrustedDerbylFunctionEnum(String functionName, String function) {
          this.functionName = functionName;
          this.function = function;
      }
  
      /**
       * Get the function name.
       *
       * @param functionName function name
       * @return function
       */
      public static String getFunctionByName(String functionName) {
          TrustedDerbylFunctionEnum entry = LOOKUP_MAP.get(functionName);
          if (entry != null) {
              return entry.function;
          }
          throw new IllegalArgumentException(String.format("Invalid function name: %s", functionName));
      }
  }
  