content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  package com.actiontech.dble.route.parser;
  
  /**
   * @author mycat
   */
  public final class ManagerParseRollback {
      private ManagerParseRollback() {
      }
  
      public static final int OTHER = -1;
      public static final int CONFIG = 1;
      public static final int LOAD_DATA = 2;
  
      public static int parse(String stmt, int offset) {
          int i = offset;
          for (; i < stmt.length(); i++) {
              switch (stmt.charAt(i)) {
                  case ' ':
                      continue;
                  case '@':
                      return rollback2Check(stmt, i);
                  default:
                      return OTHER;
              }
          }
          return OTHER;
      }
  
      private static int rollback2Check(String stmt, int offset) {
          if (stmt.length() > ++offset && stmt.charAt(offset) == '@' &&
                  stmt.length() > ++offset) {
              switch (stmt.charAt(offset)) {
                  case 'C':
                  case 'c':
                      return rollback2CCheck(stmt, offset);
                  default:
                      return OTHER;
              }
          }
          return OTHER;
      }
  
      // ROLLBACK @@CONFIG
      private static int rollback2CCheck(String stmt, int offset) {
          if (stmt.length() > offset + 5) {
              char c1 = stmt.charAt(++offset);
              char c2 = stmt.charAt(++offset);
              char c3 = stmt.charAt(++offset);
              char c4 = stmt.charAt(++offset);
              char c5 = stmt.charAt(++offset);
              if ((c1 == 'O' || c1 == 'o') && (c2 == 'N' || c2 == 'n') && (c3 == 'F' || c3 == 'f') &&
                      (c4 == 'I' || c4 == 'i') && (c5 == 'G' || c5 == 'g')) {
                  if (stmt.length() > ++offset && stmt.charAt(offset) != ' ') {
                      return OTHER;
                  }
                  return CONFIG;
              }
          }
          return OTHER;
      }
  
  
  }
  