2 * Copyright 2007 ZXing authors
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 package com.google.zxing.qrcode.decoder;
20 * <p>See ISO 18004:2006, 6.4.1, Tables 2 and 3. This enum encapsulates the various modes in which
21 * data can be encoded to bits in the QR code standard.</p>
25 public final class Mode {
27 // No, we can't use an enum here. J2ME doesn't support it.
29 public static final Mode TERMINATOR = new Mode(new int[]{0, 0, 0}, 0x00, "TERMINATOR"); // Not really a mode...
30 public static final Mode NUMERIC = new Mode(new int[]{10, 12, 14}, 0x01, "NUMERIC");
31 public static final Mode ALPHANUMERIC = new Mode(new int[]{9, 11, 13}, 0x02, "ALPHANUMERIC");
32 public static final Mode STRUCTURED_APPEND = new Mode(new int[]{0, 0, 0}, 0x03, "STRUCTURED_APPEND"); // Not supported
33 public static final Mode BYTE = new Mode(new int[]{8, 16, 16}, 0x04, "BYTE");
34 public static final Mode ECI = new Mode(null, 0x07, "ECI"); // character counts don't apply
35 public static final Mode KANJI = new Mode(new int[]{8, 10, 12}, 0x08, "KANJI");
36 public static final Mode FNC1_FIRST_POSITION = new Mode(null, 0x05, "FNC1_FIRST_POSITION");
37 public static final Mode FNC1_SECOND_POSITION = new Mode(null, 0x09, "FNC1_SECOND_POSITION");
39 private final int[] characterCountBitsForVersions;
40 private final int bits;
41 private final String name;
43 private Mode(int[] characterCountBitsForVersions, int bits, String name) {
44 this.characterCountBitsForVersions = characterCountBitsForVersions;
50 * @param bits four bits encoding a QR Code data mode
51 * @return {@link Mode} encoded by these bits
52 * @throws IllegalArgumentException if bits do not correspond to a known mode
54 public static Mode forBits(int bits) {
63 return STRUCTURED_APPEND;
67 return FNC1_FIRST_POSITION;
73 return FNC1_SECOND_POSITION;
75 throw new IllegalArgumentException();
80 * @param version version in question
81 * @return number of bits used, in this QR Code symbol {@link Version}, to encode the
82 * count of characters that will follow encoded in this {@link Mode}
84 public int getCharacterCountBits(Version version) {
85 if (characterCountBitsForVersions == null) {
86 throw new IllegalArgumentException("Character count doesn't apply to this mode");
88 int number = version.getVersionNumber();
92 } else if (number <= 26) {
97 return characterCountBitsForVersions[offset];
100 public int getBits() {
104 public String getName() {
108 public String toString() {