BitStatus.java revision 1088:7e62d98d4625 
1/*
2 * Permission is hereby granted, free of charge, to any person obtaining a copy of
3 * this software and associated documentation files (the "Software"), to deal in
4 * the Software without restriction, including without limitation the rights to
5 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
6 * of the Software, and to permit persons to whom the Software is furnished to do
7 * so, subject to the following conditions:
8 *
9 * The above copyright notice and this permission notice shall be included in all
10 * copies or substantial portions of the Software.
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
15 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
16 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
17 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
18 * SOFTWARE.
19 */
20package jdk.nashorn.internal.runtime.regexp.joni;
21
22final class BitStatus {
23    public static final int BIT_STATUS_BITS_NUM = 4 * 8;
24
25    public static int bsClear() {
26        return 0;
27    }
28
29    public static int bsAll() {
30        return -1;
31    }
32
33    public static boolean bsAt(final int stats, final int n) {
34        return (n < BIT_STATUS_BITS_NUM ? stats & (1 << n) : (stats & 1)) != 0;
35    }
36
37    public static int bsOnAt(final int statsp, final int n) {
38        int stats = statsp;
39        if (n < BIT_STATUS_BITS_NUM) {
40            stats |= (1 << n);
41        } else {
42            stats |= 1;
43        }
44        return stats;
45    }
46
47    public static int bsOnOff(final int v, final int f, final boolean negative) {
48        return negative ? (v & ~f) : (v | f);
49    }
50}
51