ManagerParseSelect.java
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/*
* 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 io.mycat.route.parser;
import io.mycat.route.parser.util.ParseUtil;
/**
* @author mycat
*/
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;
public static final int SESSION_TX_READ_ONLY = 3;
private static final char[] _VERSION_COMMENT = "VERSION_COMMENT".toCharArray();
private static final char[] _SESSION_AUTO_INCREMENT = "SESSION.AUTO_INCREMENT_INCREMENT".toCharArray();
private static final char[] _SESSION_TX_READ_ONLY = "SESSION.TX_READ_ONLY".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) == '@'
&& 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
&& ParseUtil.compare(stmt, offset, _VERSION_COMMENT)) {
if (stmt.length() > length && stmt.charAt(length) != ' ') {
return OTHER;
}
return VERSION_COMMENT;
}
return OTHER;
}
// SESSION.AUTO_INCREMENT_INCREMENT or SESSION.TX_READ_ONLY
static int select2SCheck(String stmt, int offset) {
int length = offset + _SESSION_AUTO_INCREMENT.length;
if (stmt.length() >= length
&& ParseUtil.compare(stmt, offset, _SESSION_AUTO_INCREMENT)) {
if (stmt.length() > length && stmt.charAt(length) != ' ') {
return OTHER;
}
return SESSION_AUTO_INCREMENT;
} else if (stmt.length() >= (offset + _SESSION_TX_READ_ONLY.length)
&& ParseUtil.compare(stmt, offset, _SESSION_TX_READ_ONLY)) {
if (stmt.length() > length && stmt.charAt(length) != ' ') {
return OTHER;
}
return SESSION_TX_READ_ONLY;
}
return OTHER;
}
}