2 * Copyright 2007 Google Inc.
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;
19 import com.google.zxing.ReaderException;
22 * <p>See ISO 18004:2006, 6.4.1, Tables 2 and 3. This enum encapsulates the various modes in which
23 * data can be encoded to bits in the QR code standard.</p>
25 * @author srowen@google.com (Sean Owen)
29 // No, we can't use an enum here. J2ME doesn't support it.
31 static final Mode TERMINATOR = new Mode(new int[]{0, 0, 0}); // Not really a mode...
32 static final Mode NUMERIC = new Mode(new int[]{10, 12, 14});
33 static final Mode ALPHANUMERIC = new Mode(new int[]{9, 11, 13});
34 static final Mode BYTE = new Mode(new int[]{8, 16, 16});
35 static final Mode ECI = new Mode(null); // character counts don't apply
36 static final Mode KANJI = new Mode(new int[]{8, 10, 12});
38 private final int[] characterCountBitsForVersions;
40 private Mode(int[] characterCountBitsForVersions) {
41 this.characterCountBitsForVersions = characterCountBitsForVersions;
45 * @param bits four bits encoding a QR Code data mode
46 * @return {@link Mode} encoded by these bits
47 * @throws ReaderException if bits do not correspond to a known mode
49 static Mode forBits(int bits) throws ReaderException {
64 throw new ReaderException("Illegal mode bits: " + bits);
69 * @param version version in question
70 * @return number of bits used, in this QR Code symbol {@link Version}, to encode the
71 * count of characters that will follow encoded in this {@link Mode}
73 int getCharacterCountBits(Version version) {
75 throw new UnsupportedOperationException("Character count doesn't apply to ECI mode");
77 int number = version.getVersionNumber();
81 } else if (number <= 26) {
86 return characterCountBitsForVersions[offset];