content: /*
   * Copyright 2016 the original author or authors.
   *
   * 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 org.springframework.cloud.stream.binder.rocket.utils;
  
  import java.io.UnsupportedEncodingException;
  
  /**
   * @author Xi Ning Wang
   */
  public final class RocketMQTopicUtils {
  
      private RocketMQTopicUtils() {
  
      }
  
      /**
       * Allowed chars are ASCII alphanumerics, '.', '_' and '-'.
       */
      public static void validateTopicName(String topicName) {
          try {
              byte[] utf8 = topicName.getBytes("UTF-8");
              for (byte b : utf8) {
                  if (!((b >= 'a') && (b <= 'z') || (b >= 'A') && (b <= 'Z') || (b >= '0') && (b <= '9') || (b == '.')
                          || (b == '-') || (b == '_'))) {
                      throw new IllegalArgumentException(
                              "Topic name can only have ASCII alphanumerics, '.', '_' and '-', but was: '" + topicName
                                      + "'");
                  }
              }
          } catch (UnsupportedEncodingException e) {
              throw new AssertionError(e); // Can't happen
          }
      }
  }
  