content: /*
   * Copyright 1999-2019 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
   *
   *      https://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.csp.sentinel.adapter.gateway.common.param;
  
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.regex.Pattern;
  
  import com.alibaba.csp.sentinel.log.RecordLog;
  
  /**
   * @author Eric Zhao
   * @since 1.6.2
   */
  public final class GatewayRegexCache {
  
      private static final Map<String, Pattern> REGEX_CACHE = new ConcurrentHashMap<>();
  
      public static Pattern getRegexPattern(String pattern) {
          if (pattern == null) {
              return null;
          }
          return REGEX_CACHE.get(pattern);
      }
  
      public static boolean addRegexPattern(String pattern) {
          if (pattern == null) {
              return false;
          }
          try {
              Pattern regex = Pattern.compile(pattern);
              REGEX_CACHE.put(pattern, regex);
              return true;
          } catch (Exception ex) {
              RecordLog.warn("[GatewayRegexCache] Failed to compile the regex: " + pattern, ex);
              return false;
          }
      }
  
      public static void clear() {
          REGEX_CACHE.clear();
      }
  
      private GatewayRegexCache() {}
  }
  