content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * 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.cobar.manager.parser;
  
  import com.alibaba.cobar.parser.util.ParseUtil;
  
  /**
   * @author xianmao.hexm 2011-5-9 下午04:16:19
   */
  public final class ManagerParseSelect {
  
      public static final int OTHER = -1;
      public static final int VERSION_COMMENT = 1;
      public static final int SESSION_AUTO_INCREMENT = 2;
  
      private static final char[] _VERSION_COMMENT = "VERSION_COMMENT".toCharArray();
      private static final char[] _SESSION_AUTO_INCREMENT = "SESSION.AUTO_INCREMENT_INCREMENT".toCharArray();
  
      public static int parse(String stmt, int offset) {
          int i = offset;
          for (; i < stmt.length(); i++) {
              switch (stmt.charAt(i)) {
              case ' ':
                  continue;
              case '/':
              case '#':
                  i = ParseUtil.comment(stmt, i);
                  continue;
              case '@':
                  return select2Check(stmt, i);
              default:
                  return OTHER;
              }
          }
          return OTHER;
      }
  
      static int select2Check(String stmt, int offset) {
          if (stmt.length() > ++offset && stmt.charAt(offset) == '@') {
              if (stmt.length() > ++offset) {
                  switch (stmt.charAt(offset)) {
                  case 'S':
                  case 's':
                      return select2SCheck(stmt, offset);
                  case 'V':
                  case 'v':
                      return select2VCheck(stmt, offset);
                  default:
                      return OTHER;
                  }
              }
          }
          return OTHER;
      }
  
      // VERSION_COMMENT
      static int select2VCheck(String stmt, int offset) {
          int length = offset + _VERSION_COMMENT.length;
          if (stmt.length() >= length) {
              if (ParseUtil.compare(stmt, offset, _VERSION_COMMENT)) {
                  if (stmt.length() > length && stmt.charAt(length) != ' ') {
                      return OTHER;
                  }
                  return VERSION_COMMENT;
              }
          }
          return OTHER;
      }
  
      // SESSION.AUTO_INCREMENT_INCREMENT
      static int select2SCheck(String stmt, int offset) {
          int length = offset + _SESSION_AUTO_INCREMENT.length;
          if (stmt.length() >= length) {
              if (ParseUtil.compare(stmt, offset, _SESSION_AUTO_INCREMENT)) {
                  if (stmt.length() > length && stmt.charAt(length) != ' ') {
                      return OTHER;
                  }
                  return SESSION_AUTO_INCREMENT;
              }
          }
          return OTHER;
      }
  
  }
  