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.beam.it.kafka;
  
  import static org.apache.beam.it.common.utils.ResourceManagerUtils.generateResourceId;
  
  import java.time.format.DateTimeFormatter;
  import java.util.regex.Pattern;
  
  /** Utilities for {@link KafkaResourceManager} implementations. */
  final class KafkaResourceManagerUtils {
  
    // from
    // https://github.com/apache/kafka/blob/0.10.2/core/src/main/scala/kafka/common/Topic.scala#L24
    // legalChars = "[a-zA-Z0-9\\._\\-]"
    // maxNameLength = 249
    private static final int MAX_TOPIC_NAME_LENGTH = 249;
    private static final Pattern ILLEGAL_TOPIC_NAME_CHARS = Pattern.compile("[^a-zA-Z0-9._\\-]");
    private static final String REPLACE_TOPIC_NAME_CHAR = "-";
    private static final DateTimeFormatter TIME_FORMAT =
        DateTimeFormatter.ofPattern("yyyyMMdd-HHmmss-SSSSSS");
  
    private KafkaResourceManagerUtils() {}
  
    /**
     * Generates a kafka topic name from a given string.
     *
     * @param baseString The string to generate the name from.
     * @return The topic name string.
     */
    static String generateTopicName(String baseString) {
  
      return generateResourceId(
          baseString,
          ILLEGAL_TOPIC_NAME_CHARS,
          REPLACE_TOPIC_NAME_CHAR,
          MAX_TOPIC_NAME_LENGTH,
          TIME_FORMAT);
    }
  }
  