content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements. See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF licenses this file to You 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 org.apache.kafka.tools.filter;
  
  import org.apache.kafka.common.internals.Topic;
  
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import java.util.regex.Pattern;
  import java.util.regex.PatternSyntaxException;
  
  public abstract class TopicFilter {
  
      protected final String regex;
      private final Pattern pattern;
      public TopicFilter(String rawRegex) {
          this.regex = rawRegex
                  .trim()
                  .replace(',', '|')
                  .replace(" ", "")
                  .replaceAll("^[\"']+", "")
                  .replaceAll("[\"']+$", ""); // property files may bring quotes
          try {
              this.pattern = Pattern.compile(regex);
          } catch (PatternSyntaxException e) {
              throw new RuntimeException(regex + " is an invalid regex.");
          }
      }
  
      public abstract boolean isTopicAllowed(String topic, boolean excludeInternalTopics);
  
      @Override
      public String toString() {
          return this.regex;
      }
  
      public Pattern getPattern() {
          return pattern;
      }
  
      public static class IncludeList extends TopicFilter {
          private static final Logger log = LoggerFactory.getLogger(IncludeList.class);
          public IncludeList(String rawRegex) {
              super(rawRegex);
          }
  
          @Override
          public boolean isTopicAllowed(String topic, boolean excludeInternalTopics) {
              boolean allowed = topic.matches(regex) && !(Topic.isInternal(topic) && excludeInternalTopics);
              if (allowed) {
                  log.debug("{} allowed", topic);
              } else {
                  log.debug("{} filtered", topic);
              }
              return allowed;
          }
      }
  
  }
  