1 /*
2 * Copyright 2007 ZXing authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 package com.google.zxing.qrcode.decoder;
18
19 /**
20 * <p>See ISO 18004:2006, 6.5.1. This enum encapsulates the four error correction levels
21 * defined by the QR code standard.</p>
22 *
23 * @author Sean Owen
24 */
25 public enum ErrorCorrectionLevel {
26
27 /** L = ~7% correction */
28 L(0x01),
29 /** M = ~15% correction */
30 M(0x00),
31 /** Q = ~25% correction */
32 Q(0x03),
33 /** H = ~30% correction */
34 H(0x02);
35
36 private static final ErrorCorrectionLevel[] FOR_BITS = {M, L, H, Q};
37
38 private final int bits;
39
40 ErrorCorrectionLevel(int bits) {
41 this.bits = bits;
42 }
43
44 public int getBits() {
45 return bits;
46 }
47
48 /**
49 * @param bits int containing the two bits encoding a QR Code's error correction level
50 * @return ErrorCorrectionLevel representing the encoded error correction level
51 */
52 public static ErrorCorrectionLevel forBits(int bits) {
53 if (bits < 0 || bits >= FOR_BITS.length) {
54 throw new IllegalArgumentException();
55 }
56 return FOR_BITS[bits];
57 }
58
59
60 }
61