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.client.config.utils;
  
  import com.alibaba.nacos.api.common.Constants;
  
  import static com.alibaba.nacos.api.common.Constants.WORD_SEPARATOR;
  
  /**
   * Content Util
   *
   * @author Nacos
   */
  public class ContentUtils {
  
      public static void verifyIncrementPubContent(String content) {
  
          if (content == null || content.length() == 0) {
              throw new IllegalArgumentException("发布/删除内容不能为空");
          }
          for (int i = 0; i < content.length(); i++) {
              char c = content.charAt(i);
              if (c == '\r' || c == '\n') {
                  throw new IllegalArgumentException("发布/删除内容不能包含回车和换行");
              }
              if (c == Constants.WORD_SEPARATOR.charAt(0)) {
                  throw new IllegalArgumentException("发布/删除内容不能包含(char)2");
              }
          }
      }
  
      public static String getContentIdentity(String content) {
          int index = content.indexOf(WORD_SEPARATOR);
          if (index == -1) {
              throw new IllegalArgumentException("内容没有包含分隔符");
          }
          return content.substring(0, index);
      }
  
      public static String getContent(String content) {
          int index = content.indexOf(WORD_SEPARATOR);
          if (index == -1) {
              throw new IllegalArgumentException("内容没有包含分隔符");
          }
          return content.substring(index + 1);
      }
  
      public static String truncateContent(String content) {
          if (content == null) {
              return "";
          } else if (content.length() <= SHOW_CONTENT_SIZE) {
              return content;
          } else {
              return content.substring(0, SHOW_CONTENT_SIZE) + "...";
          }
      }
  
      private static int SHOW_CONTENT_SIZE = 100;
  }
  