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/*
* Copyright 2007 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.zxing.qrcode.decoder;
/**
* <p>See ISO 18004:2006, 6.4.1, Tables 2 and 3. This enum encapsulates the various modes in which
* data can be encoded to bits in the QR code standard.</p>
*
* @author Sean Owen
*/
public final class Mode {
// No, we can't use an enum here. J2ME doesn't support it.
public static final Mode TERMINATOR = new Mode(new int[]{0, 0, 0}, 0x00, "TERMINATOR"); // Not really a mode...
public static final Mode NUMERIC = new Mode(new int[]{10, 12, 14}, 0x01, "NUMERIC");
public static final Mode ALPHANUMERIC = new Mode(new int[]{9, 11, 13}, 0x02, "ALPHANUMERIC");
public static final Mode STRUCTURED_APPEND = new Mode(new int[]{0, 0, 0}, 0x03, "STRUCTURED_APPEND"); // Not supported
public static final Mode BYTE = new Mode(new int[]{8, 16, 16}, 0x04, "BYTE");
public static final Mode ECI = new Mode(null, 0x07, "ECI"); // character counts don't apply
public static final Mode KANJI = new Mode(new int[]{8, 10, 12}, 0x08, "KANJI");
public static final Mode FNC1_FIRST_POSITION = new Mode(null, 0x05, "FNC1_FIRST_POSITION");
public static final Mode FNC1_SECOND_POSITION = new Mode(null, 0x09, "FNC1_SECOND_POSITION");
/** See GBT 18284-2000; "Hanzi" is a transliteration of this mode name. */
public static final Mode HANZI = new Mode(new int[]{8, 10, 12}, 0x0D, "HANZI");
private final int[] characterCountBitsForVersions;
private final int bits;
private final String name;
private Mode(int[] characterCountBitsForVersions, int bits, String name) {
this.characterCountBitsForVersions = characterCountBitsForVersions;
this.bits = bits;
this.name = name;
}
/**
* @param bits four bits encoding a QR Code data mode
* @return Mode encoded by these bits
* @throws IllegalArgumentException if bits do not correspond to a known mode
*/
public static Mode forBits(int bits) {
switch (bits) {
case 0x0:
return TERMINATOR;
case 0x1:
return NUMERIC;
case 0x2:
return ALPHANUMERIC;
case 0x3:
return STRUCTURED_APPEND;
case 0x4:
return BYTE;
case 0x5:
return FNC1_FIRST_POSITION;
case 0x7:
return ECI;
case 0x8:
return KANJI;
case 0x9:
return FNC1_SECOND_POSITION;
case 0xD:
// 0xD is defined in GBT 18284-2000, may not be supported in foreign country
return HANZI;
default:
throw new IllegalArgumentException();
}
}
/**
* @param version version in question
* @return number of bits used, in this QR Code symbol {@link Version}, to encode the
* count of characters that will follow encoded in this Mode
*/
public int getCharacterCountBits(Version version) {
if (characterCountBitsForVersions == null) {
throw new IllegalArgumentException("Character count doesn't apply to this mode");
}
int number = version.getVersionNumber();
int offset;
if (number <= 9) {
offset = 0;
} else if (number <= 26) {
offset = 1;
} else {
offset = 2;
}
return characterCountBitsForVersions[offset];
}
public int getBits() {
return bits;
}
public String getName() {
return name;
}
public String toString() {
return name;
}
}
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