| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.iapi.services.locks.ShExQual |
| 4 | |
| 5 | Copyright 1998, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.iapi.services.locks; |
| 22 | |
| 23 | /** |
| 24 | * This class is intended to be used a the qualifier class for ShExLockable. |
| 25 | */ |
| 26 | public class ShExQual |
| 27 | { |
| 28 | private int lockState; |
| 29 | |
| 30 | private ShExQual(int lockState) |
| 31 | { |
| 32 | this.lockState = lockState; |
| 33 | } |
| 34 | |
| 35 | /* |
| 36 | ** These are intentionally package protected. They are intended to |
| 37 | ** be used in this class and by ShExLockable, and by no one else. |
| 38 | */ |
| 39 | public static final int SHARED = 0; |
| 40 | public static final int EXCLUSIVE = 1; |
| 41 | |
| 42 | /* Shared Lock */ |
| 43 | public static final ShExQual SH = new ShExQual(SHARED); |
| 44 | |
| 45 | /* Exclusive Lock */ |
| 46 | public static final ShExQual EX = new ShExQual(EXCLUSIVE); |
| 47 | |
| 48 | public int getLockState() |
| 49 | { |
| 50 | return lockState; |
| 51 | } |
| 52 | |
| 53 | public String toString() |
| 54 | { |
| 55 | if (lockState == SHARED) |
| 56 | return "S"; |
| 57 | else |
| 58 | return "X"; |
| 59 | } |
| 60 | } |