/*
* 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
* @author wenfeng.cenwf 2011-4-19
*/
public final class ManagerParse {
public static final int OTHER = -1;
public static final int SELECT = 1;
public static final int SET = 2;
public static final int SHOW = 3;
public static final int SWITCH = 4;
public static final int KILL_CONN = 5;
public static final int STOP = 6;
public static final int RELOAD = 7;
public static final int ROLLBACK = 8;
public static final int OFFLINE = 9;
public static final int ONLINE = 10;
public static final int CLEAR = 11;
public static int parse(String stmt) {
for (int i = 0; i < stmt.length(); i++) {
switch (stmt.charAt(i)) {
case ' ':
continue;
case '/':
case '#':
i = ParseUtil.comment(stmt, i);
continue;
case 'C':
case 'c':
return cCheck(stmt, i);
case 'S':
case 's':
return sCheck(stmt, i);
case 'K':
case 'k':
return kill(stmt, i);
case 'O':
case 'o':
return oCheck(stmt, i);
case 'R':
case 'r':
return rCheck(stmt, i);
default:
return OTHER;
}
}
return OTHER;
}
// CLEAR
private static int cCheck(String stmt, int offset) {
if (stmt.length() > offset + "LEAR ".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 == 'L' || c1 == 'l') && (c2 == 'E' || c2 == 'e') && (c3 == 'A' || c3 == 'a')
&& (c4 == 'R' || c4 == 'r') && (c5 == ' ' || c5 == '\t' || c5 == '\r' || c5 == '\n')) {
return (offset << 8) | CLEAR;
}
}
return OTHER;
}
private static int oCheck(String stmt, int offset) {
if (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case 'F':
case 'f':
return ofCheck(stmt, offset);
case 'N':
case 'n':
return onCheck(stmt, offset);
default:
return OTHER;
}
}
return OTHER;
}
private static int onCheck(String stmt, int offset) {
if (stmt.length() > offset + "line".length()) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'l' || c1 == 'L') && (c2 == 'i' || c2 == 'I') && (c3 == 'n' || c3 == 'N')
&& (c4 == 'e' || c4 == 'E') && (stmt.length() == ++offset || ParseUtil.isEOF(stmt.charAt(offset)))) {
return ONLINE;
}
}
return OTHER;
}
private static int ofCheck(String stmt, int offset) {
if (stmt.length() > offset + "fline".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 == 'f' || c1 == 'F') && (c2 == 'l' || c2 == 'L') && (c3 == 'i' || c3 == 'I')
&& (c4 == 'n' || c4 == 'N') && (c5 == 'e' || c5 == 'E')
&& (stmt.length() == ++offset || ParseUtil.isEOF(stmt.charAt(offset)))) {
return OFFLINE;
}
}
return OTHER;
}
private static int sCheck(String stmt, int offset) {
if (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case 'E':
case 'e':
return seCheck(stmt, offset);
case 'H':
case 'h':
return show(stmt, offset);
case 'W':
case 'w':
return swh(stmt, offset);
case 'T':
case 't':
return stop(stmt, offset);
default:
return OTHER;
}
}
return OTHER;
}
private static int seCheck(String stmt, int offset) {
if (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case 'L':
case 'l':
return select(stmt, offset);
case 'T':
case 't':
if (stmt.length() > ++offset) {
char c = stmt.charAt(offset);
if (c == ' ' || c == '\r' || c == '\n' || c == '\t' || c == '/' || c == '#') {
return SET;
}
}
return OTHER;
default:
return OTHER;
}
}
return OTHER;
}
private static int rCheck(String stmt, int offset) {
if (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case 'E':
case 'e':
return reload(stmt, offset);
case 'O':
case 'o':
return rollback(stmt, offset);
default:
return OTHER;
}
}
return OTHER;
}
// RELOAD' '
private static int reload(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 == 'L' || c1 == 'l') && (c2 == 'O' || c2 == 'o') && (c3 == 'A' || c3 == 'a')
&& (c4 == 'D' || c4 == 'd') && (c5 == ' ' || c5 == '\t' || c5 == '\r' || c5 == '\n')) {
return (offset << 8) | RELOAD;
}
}
return OTHER;
}
// ROLLBACK' '
private static int rollback(String stmt, int offset) {
if (stmt.length() > offset + 7) {
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);
char c7 = stmt.charAt(++offset);
if ((c1 == 'L' || c1 == 'l') && (c2 == 'L' || c2 == 'l') && (c3 == 'B' || c3 == 'b')
&& (c4 == 'A' || c4 == 'a') && (c5 == 'C' || c5 == 'c') && (c6 == 'K' || c6 == 'k')
&& (c7 == ' ' || c7 == '\t' || c7 == '\r' || c7 == '\n')) {
return (offset << 8) | ROLLBACK;
}
}
return OTHER;
}
// SELECT' '
private static int select(String stmt, int offset) {
if (stmt.length() > offset + 4) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'E' || c1 == 'e') && (c2 == 'C' || c2 == 'c') && (c3 == 'T' || c3 == 't')
&& (c4 == ' ' || c4 == '\t' || c4 == '\r' || c4 == '\n')) {
return (offset << 8) | SELECT;
}
}
return OTHER;
}
// SHOW' '
private static int show(String stmt, int offset) {
if (stmt.length() > offset + 3) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
if ((c1 == 'O' || c1 == 'o') && (c2 == 'W' || c2 == 'w')
&& (c3 == ' ' || c3 == '\t' || c3 == '\r' || c3 == '\n')) {
return (offset << 8) | SHOW;
}
}
return OTHER;
}
// SWITCH' '
private static int swh(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 == 'I' || c1 == 'i') && (c2 == 'T' || c2 == 't') && (c3 == 'C' || c3 == 'c')
&& (c4 == 'H' || c4 == 'h') && (c5 == ' ' || c5 == '\t' || c5 == '\r' || c5 == '\n')) {
return (offset << 8) | SWITCH;
}
}
return OTHER;
}
// STOP' '
private static int stop(String stmt, int offset) {
if (stmt.length() > offset + 3) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
if ((c1 == 'O' || c1 == 'o') && (c2 == 'P' || c2 == 'p')
&& (c3 == ' ' || c3 == '\t' || c3 == '\r' || c3 == '\n')) {
return (offset << 8) | STOP;
}
}
return OTHER;
}
// KILL @
private static int kill(String stmt, int offset) {
if (stmt.length() > offset + 3) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'I' || c1 == 'i') && (c2 == 'L' || c2 == 'l') && (c3 == 'L' || c3 == 'l')
&& (c4 == ' ' || c4 == '\t' || c4 == '\r' || c4 == '\n')) {
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
case '\t':
case '\r':
case '\n':
continue;
case '@':
return killConnection(stmt, offset);
default:
return OTHER;
}
}
return OTHER;
}
}
return OTHER;
}
// KILL @@CONNECTION' ' XXXXXX
private static int killConnection(String stmt, int offset) {
if (stmt.length() > offset + "@CONNECTION ".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);
char c7 = stmt.charAt(++offset);
char c8 = stmt.charAt(++offset);
char c9 = stmt.charAt(++offset);
char c10 = stmt.charAt(++offset);
char c11 = stmt.charAt(++offset);
char c12 = stmt.charAt(++offset);
if ((c1 == '@') && (c2 == 'C' || c2 == 'c') && (c3 == 'O' || c3 == 'o') && (c4 == 'N' || c4 == 'n')
&& (c5 == 'N' || c5 == 'n') && (c6 == 'E' || c6 == 'e') && (c7 == 'C' || c7 == 'c')
&& (c8 == 'T' || c8 == 't') && (c9 == 'I' || c9 == 'i') && (c10 == 'O' || c10 == 'o')
&& (c11 == 'N' || c11 == 'n') && (c12 == ' ' || c12 == '\t' || c12 == '\r' || c12 == '\n')) {
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
case '\t':
case '\r':
case '\n':
continue;
default:
return (offset << 8) | KILL_CONN;
}
}
}
}
return OTHER;
}
}