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.config.server.utils;
  
  /**
   * 合成dataId+groupId的形式。对dataId和groupId中的保留字符做转义。
   *
   * @author jiuRen
   */
  public class GroupKey {
  
      static public String getKey(String dataId, String group) {
          StringBuilder sb = new StringBuilder();
          urlEncode(dataId, sb);
          sb.append('+');
          urlEncode(group, sb);
          return sb.toString();
      }
  
      static public String getKeyTenant(String dataId, String group, String tenant) {
          StringBuilder sb = new StringBuilder();
          urlEncode(dataId, sb);
          sb.append('+');
          urlEncode(group, sb);
          if (StringUtils.isNotEmpty(tenant)) {
              sb.append('+');
              urlEncode(tenant, sb);
          }
          return sb.toString();
      }
  
      static public String getKey(String dataId, String group, String datumStr) {
          StringBuilder sb = new StringBuilder();
          urlEncode(dataId, sb);
          sb.append('+');
          urlEncode(group, sb);
          sb.append('+');
          urlEncode(datumStr, sb);
          return sb.toString();
      }
  
      static public String[] parseKey(String groupKey) {
          StringBuilder sb = new StringBuilder();
          String dataId = null;
          String group = null;
          String tenant = null;
  
          for (int i = 0; i < groupKey.length(); ++i) {
              char c = groupKey.charAt(i);
              if ('+' == c) {
                  if (null == dataId) {
                      dataId = sb.toString();
                      sb.setLength(0);
                  } else if (null == group) {
                      group = sb.toString();
                      sb.setLength(0);
                  } else {
                      throw new IllegalArgumentException("invalid groupkey:" + groupKey);
                  }
              } else if ('%' == c) {
                  char next = groupKey.charAt(++i);
                  char nextnext = groupKey.charAt(++i);
                  if ('2' == next && 'B' == nextnext) {
                      sb.append('+');
                  } else if ('2' == next && '5' == nextnext) {
                      sb.append('%');
                  } else {
                      throw new IllegalArgumentException("invalid groupkey:" + groupKey);
                  }
              } else {
                  sb.append(c);
              }
          }
  
          if (StringUtils.isBlank(group)) {
              group = sb.toString();
              if (group.length() == 0) {
                  throw new IllegalArgumentException("invalid groupkey:" + groupKey);
              }
          } else {
              tenant = sb.toString();
              if (group.length() == 0) {
                  throw new IllegalArgumentException("invalid groupkey:" + groupKey);
              }
          }
  
          return new String[] {dataId, group, tenant};
      }
  
      /**
       * + -> %2B % -> %25
       */
      static void urlEncode(String str, StringBuilder sb) {
          for (int idx = 0; idx < str.length(); ++idx) {
              char c = str.charAt(idx);
              if ('+' == c) {
                  sb.append("%2B");
              } else if ('%' == c) {
                  sb.append("%25");
              } else {
                  sb.append(c);
              }
          }
      }
  
  }
  