/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package org.opencloudb.parser;
import org.opencloudb.parser.util.ParseUtil;
/**
* @author mycat
*/
public class ManagerParseClear {
public static final int OTHER = -1;
public static final int SLOW_SCHEMA = 1;
public static final int SLOW_DATANODE = 2;
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 clear2Check(stmt, i);
default:
return OTHER;
}
}
return OTHER;
}
// CLEAR @@SLOW
static int clear2Check(String stmt, int offset) {
if (stmt.length() > ++offset && stmt.charAt(offset) == '@') {
if (stmt.length() > offset + "SLOW ".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 == 'S' || c1 == 's') && (c2 == 'L' || c2 == 'l') && (c3 == 'O' || c3 == 'o')
&& (c4 == 'W' || c4 == 'w') && (c5 == ' ')) {
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
continue;
case 'W':
case 'w':
return clear2WhereCheck(stmt, offset);
default:
return OTHER;
}
}
}
}
}
return OTHER;
}
// CLEAR @@SLOW WHERE
static int clear2WhereCheck(String stmt, int offset) {
if (stmt.length() > offset + "HERE ".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 == 'H' || c1 == 'h') && (c2 == 'E' || c2 == 'e') && (c3 == 'R' || c3 == 'r')
&& (c4 == 'E' || c4 == 'e') && (c5 == ' ')) {
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
continue;
case 'D':
case 'd':
return clear2DCheck(stmt, offset);
case 'S':
case 's':
return clear2SCheck(stmt, offset);
default:
return OTHER;
}
}
}
}
return OTHER;
}
// CLEAR @@SLOW WHERE DATANODE = XXXXXX
static int clear2DCheck(String stmt, int offset) {
if (stmt.length() > offset + "ATANODE".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);
if ((c1 == 'A' || c1 == 'a') && (c2 == 'T' || c2 == 't') && (c3 == 'A' || c3 == 'a')
&& (c4 == 'N' || c4 == 'n') && (c5 == 'O' || c5 == 'o') && (c6 == 'D' || c6 == 'd')
&& (c7 == 'E' || c7 == 'e')) {
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
continue;
case '=':
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
continue;
default:
return (offset << 8) | SLOW_DATANODE;
}
}
return OTHER;
default:
return OTHER;
}
}
}
}
return OTHER;
}
// CLEAR @@SLOW WHERE SCHEMA = XXXXXX
static int clear2SCheck(String stmt, int offset) {
if (stmt.length() > offset + "CHEMA".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 == 'C' || c1 == 'c') && (c2 == 'H' || c2 == 'h') && (c3 == 'E' || c3 == 'e')
&& (c4 == 'M' || c4 == 'm') && (c5 == 'A' || c5 == 'a')) {
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
continue;
case '=':
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
continue;
default:
return (offset << 8) | SLOW_SCHEMA;
}
}
return OTHER;
default:
return OTHER;
}
}
}
}
return OTHER;
}
}