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.server.parser;
  
  import com.alibaba.cobar.parser.util.ParseUtil;
  
  /**
   * @author xianmao.hexm 2011-5-7 下午01:23:06
   */
  public final class ServerParseShow {
  
      public static final int OTHER = -1;
      public static final int DATABASES = 1;
      public static final int DATASOURCES = 2;
      public static final int COBAR_STATUS = 3;
      public static final int COBAR_CLUSTER = 4;
  
      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 'C':
              case 'c':
                  return cobarCheck(stmt, i);
              case 'D':
              case 'd':
                  return dataCheck(stmt, i);
              default:
                  return OTHER;
              }
          }
          return OTHER;
      }
  
      // SHOW COBAR_
      static int cobarCheck(String stmt, int offset) {
          if (stmt.length() > offset + "obar_?".length()) {
              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 == 'B' || c2 == 'b') && (c3 == 'A' || c3 == 'a')
                      && (c4 == 'R' || c4 == 'r') && (c5 == '_')) {
                  switch (stmt.charAt(++offset)) {
                  case 'S':
                  case 's':
                      return showCobarStatus(stmt, offset);
                  case 'C':
                  case 'c':
                      return showCobarCluster(stmt, offset);
                  default:
                      return OTHER;
                  }
              }
          }
          return OTHER;
      }
  
      // SHOW COBAR_STATUS
      static int showCobarStatus(String stmt, int offset) {
          if (stmt.length() > offset + "tatus".length()) {
              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 == 't' || c1 == 'T') && (c2 == 'a' || c2 == 'A') && (c3 == 't' || c3 == 'T')
                      && (c4 == 'u' || c4 == 'U') && (c5 == 's' || c5 == 'S')
                      && (stmt.length() == ++offset || ParseUtil.isEOF(stmt.charAt(offset)))) {
                  return COBAR_STATUS;
              }
          }
          return OTHER;
      }
  
      // SHOW COBAR_CLUSTER
      static int showCobarCluster(String stmt, int offset) {
          if (stmt.length() > offset + "luster".length()) {
              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);
              char c6 = stmt.charAt(++offset);
              if ((c1 == 'L' || c1 == 'l') && (c2 == 'U' || c2 == 'u') && (c3 == 'S' || c3 == 's')
                      && (c4 == 'T' || c4 == 't') && (c5 == 'E' || c5 == 'e') && (c6 == 'R' || c6 == 'r')
                      && (stmt.length() == ++offset || ParseUtil.isEOF(stmt.charAt(offset)))) {
                  return COBAR_CLUSTER;
              }
          }
          return OTHER;
      }
  
      // SHOW DATA
      static int dataCheck(String stmt, int offset) {
          if (stmt.length() > offset + "ata?".length()) {
              char c1 = stmt.charAt(++offset);
              char c2 = stmt.charAt(++offset);
              char c3 = stmt.charAt(++offset);
              if ((c1 == 'A' || c1 == 'a') && (c2 == 'T' || c2 == 't') && (c3 == 'A' || c3 == 'a')) {
                  switch (stmt.charAt(++offset)) {
                  case 'B':
                  case 'b':
                      return showDatabases(stmt, offset);
                  case 'S':
                  case 's':
                      return showDataSources(stmt, offset);
                  default:
                      return OTHER;
                  }
              }
          }
          return OTHER;
      }
  
      // SHOW DATABASES
      static int showDatabases(String stmt, int offset) {
          if (stmt.length() > offset + "ases".length()) {
              char c1 = stmt.charAt(++offset);
              char c2 = stmt.charAt(++offset);
              char c3 = stmt.charAt(++offset);
              char c4 = stmt.charAt(++offset);
              if ((c1 == 'A' || c1 == 'a') && (c2 == 'S' || c2 == 's') && (c3 == 'E' || c3 == 'e')
                      && (c4 == 'S' || c4 == 's') && (stmt.length() == ++offset || ParseUtil.isEOF(stmt.charAt(offset)))) {
                  return DATABASES;
              }
          }
          return OTHER;
      }
  
      // SHOW DATASOURCES
      static int showDataSources(String stmt, int offset) {
          if (stmt.length() > offset + "ources".length()) {
              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);
              char c6 = stmt.charAt(++offset);
              if ((c1 == 'O' || c1 == 'o') && (c2 == 'U' || c2 == 'u') && (c3 == 'R' || c3 == 'r')
                      && (c4 == 'C' || c4 == 'c') && (c5 == 'E' || c5 == 'e') && (c6 == 'S' || c6 == 's')
                      && (stmt.length() == ++offset || ParseUtil.isEOF(stmt.charAt(offset)))) {
                  return DATASOURCES;
              }
          }
          return OTHER;
      }
  
  }
  