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/*
* Copyright 2002-2004 Jeremias Maerki.
*
* 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 org.krysalis.barcode4j.impl.codabar;
import org.krysalis.barcode4j.BarGroup;
import org.krysalis.barcode4j.ChecksumMode;
import org.krysalis.barcode4j.ClassicBarcodeLogicHandler;
/**
* This class is an implementation of the Codabar barcode.
*
* @author Jeremias Maerki
* @version $Id: CodabarLogicImpl.java,v 1.4 2008-11-22 09:57:10 jmaerki Exp $
*/
public class CodabarLogicImpl {
/**
* Defines the Codabar character set.
*/
static final byte[][] CHARSET =
{{0, 0, 0, 0, 0, 1, 1}, //0
{0, 0, 0, 0, 1, 1, 0}, //1
{0, 0, 0, 1, 0, 0, 1}, //2
{1, 1, 0, 0, 0, 0, 0}, //3
{0, 0, 1, 0, 0, 1, 0}, //4
{1, 0, 0, 0, 0, 1, 0}, //5
{0, 1, 0, 0, 0, 0, 1}, //6
{0, 1, 0, 0, 1, 0, 0}, //7
{0, 1, 1, 0, 0, 0, 0}, //8
{1, 0, 0, 1, 0, 0, 0}, //9
{0, 0, 1, 1, 0, 1, 0}, //a
{0, 1, 0, 1, 0, 0, 1}, //b
{0, 0, 0, 1, 0, 1, 1}, //c
{0, 0, 0, 1, 1, 1, 0}, //d
{0, 0, 0, 1, 1, 1, 0}, //e
{0, 1, 0, 1, 0, 0, 1}, //n
{0, 0, 1, 1, 0, 1, 0}, //t
{0, 0, 0, 1, 1, 0, 0}, //-
{0, 0, 1, 1, 0, 0, 0}, //$
{1, 0, 0, 0, 1, 0, 1}, //:
{1, 0, 1, 0, 0, 0, 1}, ///
{1, 0, 1, 0, 1, 0, 0}, //.
{0, 0, 1, 0, 1, 0, 1}, //+
{0, 0, 0, 1, 0, 1, 1}}; //*
private static final char[] CHARACTERS =
{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'a', 'b', 'c', 'd', 'e', 'n', 't',
'-', '$', ':', '/', '.', '+', '*'};
private ChecksumMode checksumMode = ChecksumMode.CP_AUTO;
private boolean displayStartStop = false;
/**
* Main constructor
*
* @param mode Determines how checksums are to be treated.
*/
public CodabarLogicImpl(ChecksumMode mode) {
this.checksumMode = mode;
}
/**
* Main constructor
*
* @param mode Determines how checksums are to be treated.
* @param displayStartStop enables or disables suppressing the start/stop characters from
* the human-readable part
*/
public CodabarLogicImpl(ChecksumMode mode, boolean displayStartStop) {
this.checksumMode = mode;
this.displayStartStop = displayStartStop;
}
/**
* Returns the index of a character within the character set.
*
* @param ch the character to lookup
* @return the index of the character or -1 if it isn't supported
*/
protected static int getCharIndex(char ch) {
for (int i = 0; i < CHARACTERS.length; i++) {
if (ch == CHARACTERS[i]) {
return i;
}
}
return -1;
}
/**
* Determines whether a character is a valid message character.
*
* @param ch the character to check
* @return true if it is a valid character, false otherwise
*/
protected static boolean isValidChar(char ch) {
return (getCharIndex(Character.toLowerCase(ch)) >= 0);
}
/**
* Determines whether a character is on of the start/stop characters.
*
* @param ch the character to check
* @return true if it is a start/stop character
*/
protected static boolean isStartStopChar(char ch) {
ch = Character.toLowerCase(ch);
return ((ch == 'a') || (ch == 'b')
|| (ch == 'c') || (ch == 'd')
|| (ch == 'e') || (ch == '*')
|| (ch == 'n') || (ch == 't'));
}
/**
* Returns the checksum mode.
*
* @return the current checksum mode
*/
public ChecksumMode getChecksumMode() {
return this.checksumMode;
}
private int widthAt(char ch, int index) throws IllegalArgumentException {
ch = Character.toLowerCase(ch);
int chidx = getCharIndex(ch);
if (chidx >= 0) {
int binary = CHARSET[chidx][index];
return binary + 1;
}
else {
throw new IllegalArgumentException("Invalid character: " + ch);
}
}
/**
* Encodes a character to a logic handler.
*
* @param logic the logic handler to send events to
* @param ch the character to encode
*/
protected void encodeChar(ClassicBarcodeLogicHandler logic, char ch) {
ch = Character.toLowerCase(ch);
logic.startBarGroup(BarGroup.MSG_CHARACTER, Character.toString(ch));
for (byte i = 0; i < 7; i++) {
final int width = widthAt(ch, i);
final boolean black = ((i % 2) == 0);
logic.addBar(black, width);
}
logic.endBarGroup();
}
private void handleChecksum(StringBuffer sb) {
if ((getChecksumMode() == ChecksumMode.CP_ADD)
|| (getChecksumMode() == ChecksumMode.CP_CHECK)) {
throw new UnsupportedOperationException(
"No checksums are currently supported for Codabar symbols");
}
else if (getChecksumMode() == ChecksumMode.CP_IGNORE) {
}
else if (getChecksumMode() == ChecksumMode.CP_AUTO) {
//equals ignore
}
}
private StringBuffer prepareMessage(String msg) {
//Remove start/stop in standard mode if present
if (isStartStopChar(msg.charAt(0)) && isStartStopChar(msg.charAt(msg.length() - 1))) {
return new StringBuffer(msg.substring(1, msg.length() - 1));
}
else {
return new StringBuffer(msg);
}
}
/**
* Generates the barcode logic.
*
* @param logic the logic handler to send generated events to
* @param msg the message to encode
*/
public void generateBarcodeLogic(ClassicBarcodeLogicHandler logic, String msg) {
StringBuffer sb = new StringBuffer(msg);
handleChecksum(sb);
//Checksum handling as requested
String effMsg = sb.toString();
String displayMsg;
if (displayStartStop) {
displayMsg = sb.toString();
}
else {
displayMsg = prepareMessage(msg).toString();
}
logic.startBarcode(effMsg, displayMsg);
for (int i = 0; i < sb.length(); i++) {
if (i > 0) {
//Intercharacter gap
logic.addBar(false, 1);
}
final char ch = sb.charAt(i);
if (!isValidChar(ch)) {
throw new IllegalArgumentException("Invalid character: " + ch);
}
encodeChar(logic, ch);
}
logic.endBarcode();
}
}
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