public static String formatPath()

in backup-core/src/main/java/org/apache/iotdb/backup/core/service/ExportPipelineService.java [602:681]
76 lines of code
28 McCabe index (conditional complexity)

  public static String formatPath(String sql) {
    String regx = "^[\\w._:@#{}$\\u2E80-\\u9FFF\"\'*\\\\]+$";
    String regxOnlyNum = "^[0-9]+$";
    char[] arr = sql.toCharArray();
    StringBuilder formatedSql = new StringBuilder();
    StringBuilder buffer = new StringBuilder();
    StringBuilder quoteCounter = new StringBuilder();
    for (int i = 0; i < arr.length; i++) {
      if ('\\' == arr[i] || '\"' == arr[i] || '\'' == arr[i]) {
        if (quoteCounter.length() == 0) {
          quoteCounter.append(arr[i]);
        } else {
          char quote = quoteCounter.charAt(quoteCounter.length() - 1);
          if ("\\".equals(quote)) {
            quoteCounter.deleteCharAt(quoteCounter.length() - 1);
          }
        }
      } else {
        if (quoteCounter.length() != 0) {
          quoteCounter.delete(0, quoteCounter.length());
        }
      }

      if ('.' == arr[i] || i == arr.length - 1) {
        if (buffer.length() != 0) {
          // quote 引用处理
          if ('\"' == buffer.charAt(0) || '\'' == buffer.charAt(0)) {
            char pre = buffer.charAt(buffer.length() - 1);
            buffer.append(arr[i]);
            if (pre == buffer.charAt(0) && quoteCounter.length() == 0) {
              formatedSql.append(buffer);
              buffer.delete(0, buffer.length());
            }
          } else {
            // 特殊字符处理 iotdb 系统关键字处理
            if (i == arr.length - 1) {
              buffer.append(arr[i]);
            }
            if (!Pattern.matches(regx, buffer.toString())
                || IotDBKeyWords.validateKeyWords(buffer.toString().toUpperCase())
                || Pattern.matches(regxOnlyNum, buffer.toString())) {
              if (i == arr.length - 1) {
                if (buffer.toString().startsWith("`") && buffer.toString().endsWith("`")) {
                  formatedSql.append(buffer);
                } else {
                  formatedSql.append("`").append(buffer).append("`");
                }
              } else {
                if (buffer.toString().startsWith("`") && buffer.toString().endsWith("`")) {
                  formatedSql.append(buffer).append(".");
                } else {
                  formatedSql.append("`").append(buffer).append("`").append(".");
                }
              }
            } else {
              if (i != arr.length - 1) {
                buffer.append(arr[i]);
              }
              formatedSql.append(buffer);
            }

            buffer.delete(0, buffer.length());
          }
        } else {
          if (!Pattern.matches(regx, buffer.toString())
              || IotDBKeyWords.validateKeyWords(buffer.toString().toUpperCase())) {
            buffer.append("`").append(arr[i]).append("`");
          } else if (Pattern.matches(regxOnlyNum, buffer.toString())) {
            buffer.append("`").append(arr[i]).append("`");
          } else {
            buffer.append(arr[i]);
          }
        }
      } else {
        buffer.append(arr[i]);
      }
    }
    formatedSql.append(buffer);
    return formatedSql.toString();
  }