barcode128.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

/*
 * $Id: Barcode128.java 2387 2006-09-16 19:08:00Z xlv $
 *
 * Copyright 2002-2006 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
package com.lowagie.text.pdf;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Image;
import java.awt.image.MemoryImageSource;

import com.lowagie.text.Element;
import com.lowagie.text.ExceptionConverter;
import com.lowagie.text.Rectangle;

/**
 * Implements the code 128 and UCC/EAN-128. Other symbologies are allowed in raw mode.<p>
 * The code types allowed are:<br>
 * <ul>
 * <li><b>CODE128</b> - plain barcode 128.
 * <li><b>CODE128_UCC</b> - support for UCC/EAN-128 with a full list of AI.
 * <li><b>CODE128_RAW</b> - raw mode. The code attribute has the actual codes from 0
 *     to 105 followed by '&#92;uffff' and the human readable text.
 * </ul>
 * The default parameters are:
 * <pre>
 * x = 0.8f;
 * font = BaseFont.createFont("Helvetica", "winansi", false);
 * size = 8;
 * baseline = size;
 * barHeight = size * 3;
 * textAlignment = Element.ALIGN_CENTER;
 * codeType = CODE128;
 * </pre>
 * @author Paulo Soares ([e-mail])
 */
public class Barcode128 extends Barcode{

    /** The bars to generate the code.
     */    
    private static final byte BARS[][] = 
    {
        {2, 1, 2, 2, 2, 2},
        {2, 2, 2, 1, 2, 2},
        {2, 2, 2, 2, 2, 1},
        {1, 2, 1, 2, 2, 3},
        {1, 2, 1, 3, 2, 2},
        {1, 3, 1, 2, 2, 2},
        {1, 2, 2, 2, 1, 3},
        {1, 2, 2, 3, 1, 2},
        {1, 3, 2, 2, 1, 2},
        {2, 2, 1, 2, 1, 3},
        {2, 2, 1, 3, 1, 2},
        {2, 3, 1, 2, 1, 2},
        {1, 1, 2, 2, 3, 2},
        {1, 2, 2, 1, 3, 2},
        {1, 2, 2, 2, 3, 1},
        {1, 1, 3, 2, 2, 2},
        {1, 2, 3, 1, 2, 2},
        {1, 2, 3, 2, 2, 1},
        {2, 2, 3, 2, 1, 1},
        {2, 2, 1, 1, 3, 2},
        {2, 2, 1, 2, 3, 1},
        {2, 1, 3, 2, 1, 2},
        {2, 2, 3, 1, 1, 2},
        {3, 1, 2, 1, 3, 1},
        {3, 1, 1, 2, 2, 2},
        {3, 2, 1, 1, 2, 2},
        {3, 2, 1, 2, 2, 1},
        {3, 1, 2, 2, 1, 2},
        {3, 2, 2, 1, 1, 2},
        {3, 2, 2, 2, 1, 1},
        {2, 1, 2, 1, 2, 3},
        {2, 1, 2, 3, 2, 1},
        {2, 3, 2, 1, 2, 1},
        {1, 1, 1, 3, 2, 3},
        {1, 3, 1, 1, 2, 3},
        {1, 3, 1, 3, 2, 1},
        {1, 1, 2, 3, 1, 3},
        {1, 3, 2, 1, 1, 3},
        {1, 3, 2, 3, 1, 1},
        {2, 1, 1, 3, 1, 3},
        {2, 3, 1, 1, 1, 3},
        {2, 3, 1, 3, 1, 1},
        {1, 1, 2, 1, 3, 3},
        {1, 1, 2, 3, 3, 1},
        {1, 3, 2, 1, 3, 1},
        {1, 1, 3, 1, 2, 3},
        {1, 1, 3, 3, 2, 1},
        {1, 3, 3, 1, 2, 1},
        {3, 1, 3, 1, 2, 1},
        {2, 1, 1, 3, 3, 1},
        {2, 3, 1, 1, 3, 1},
        {2, 1, 3, 1, 1, 3},
        {2, 1, 3, 3, 1, 1},
        {2, 1, 3, 1, 3, 1},
        {3, 1, 1, 1, 2, 3},
        {3, 1, 1, 3, 2, 1},
        {3, 3, 1, 1, 2, 1},
        {3, 1, 2, 1, 1, 3},
        {3, 1, 2, 3, 1, 1},
        {3, 3, 2, 1, 1, 1},
        {3, 1, 4, 1, 1, 1},
        {2, 2, 1, 4, 1, 1},
        {4, 3, 1, 1, 1, 1},
        {1, 1, 1, 2, 2, 4},
        {1, 1, 1, 4, 2, 2},
        {1, 2, 1, 1, 2, 4},
        {1, 2, 1, 4, 2, 1},
        {1, 4, 1, 1, 2, 2},
        {1, 4, 1, 2, 2, 1},
        {1, 1, 2, 2, 1, 4},
        {1, 1, 2, 4, 1, 2},
        {1, 2, 2, 1, 1, 4},
        {1, 2, 2, 4, 1, 1},
        {1, 4, 2, 1, 1, 2},
        {1, 4, 2, 2, 1, 1},
        {2, 4, 1, 2, 1, 1},
        {2, 2, 1, 1, 1, 4},
        {4, 1, 3, 1, 1, 1},
        {2, 4, 1, 1, 1, 2},
        {1, 3, 4, 1, 1, 1},
        {1, 1, 1, 2, 4, 2},
        {1, 2, 1, 1, 4, 2},
        {1, 2, 1, 2, 4, 1},
        {1, 1, 4, 2, 1, 2},
        {1, 2, 4, 1, 1, 2},
        {1, 2, 4, 2, 1, 1},
        {4, 1, 1, 2, 1, 2},
        {4, 2, 1, 1, 1, 2},
        {4, 2, 1, 2, 1, 1},
        {2, 1, 2, 1, 4, 1},
        {2, 1, 4, 1, 2, 1},
        {4, 1, 2, 1, 2, 1},
        {1, 1, 1, 1, 4, 3},
        {1, 1, 1, 3, 4, 1},
        {1, 3, 1, 1, 4, 1},
        {1, 1, 4, 1, 1, 3},
        {1, 1, 4, 3, 1, 1},
        {4, 1, 1, 1, 1, 3},
        {4, 1, 1, 3, 1, 1},
        {1, 1, 3, 1, 4, 1},
        {1, 1, 4, 1, 3, 1},
        {3, 1, 1, 1, 4, 1},
        {4, 1, 1, 1, 3, 1},
        {2, 1, 1, 4, 1, 2},
        {2, 1, 1, 2, 1, 4},
        {2, 1, 1, 2, 3, 2}
    };
    
    /** The stop bars.
     */    
    private static final byte BARS_STOP[] = {2, 3, 3, 1, 1, 1, 2};
    /** The charset code change.
     */
    public static final char CODE_AB_TO_C = 99;
    /** The charset code change.
     */
    public static final char CODE_AC_TO_B = 100;
    /** The charset code change.
     */
    public static final char CODE_BC_TO_A = 101;
    /** The code for UCC/EAN-128.
     */
    public static final char FNC1_INDEX = 102;
    /** The start code.
     */
    public static final char START_A = 103;
    /** The start code.
     */
    public static final char START_B = 104;
    /** The start code.
     */
    public static final char START_C = 105;

    public static final char FNC1 = '\u00ca';
    public static final char DEL = '\u00c3';
    public static final char FNC3 = '\u00c4';
    public static final char FNC2 = '\u00c5';
    public static final char SHIFT = '\u00c6';
    public static final char CODE_C = '\u00c7';
    public static final char CODE_A = '\u00c8';
    public static final char FNC4 = '\u00c8';
    public static final char STARTA = '\u00cb';
    public static final char STARTB = '\u00cc';
    public static final char STARTC = '\u00cd';
    
    private static final IntHashtable ais = new IntHashtable();
    /** Creates new Barcode128 */
    public Barcode128() {
        try {
            x = 0.8f;
            font = BaseFont.createFont("Helvetica", "winansi", false);
            size = 8;
            baseline = size;
            barHeight = size * 3;
            textAlignment = Element.ALIGN_CENTER;
            codeType = CODE128;
        }
        catch (Exception e) {
            throw new ExceptionConverter(e);
        }
    }

    /**
     * Removes the FNC1 codes in the text.
     * @param code the text to clean
     * @return the cleaned text
     */    
    public static String removeFNC1(String code) {
        int len = code.length();
        StringBuffer buf = new StringBuffer(len);
        for (int k = 0; k < len; ++k) {
            char c = code.charAt(k);
            if (c >= 32 && c <= 126)
                buf.append(c);
        }
        return buf.toString();
    }
    
    /**
     * Gets the human readable text of a sequence of AI.
     * @param code the text
     * @return the human readable text
     */    
    public static String getHumanReadableUCCEAN(String code) {
        StringBuffer buf = new StringBuffer();
        String fnc1 = String.valueOf(FNC1);
        try {
            while (true) {
                if (code.startsWith(fnc1)) {
                    code = code.substring(1);
                    continue;
                }
                int n = 0;
                int idlen = 0;
                for (int k = 2; k < 5; ++k) {
                    if (code.length() < k)
                        break;
                    if ((n = ais.get(Integer.parseInt(code.substring(0, k)))) != 0) {
                        idlen = k;
                        break;
                    }
                }
                if (idlen == 0)
                    break;
                buf.append('(').append(code.substring(0, idlen)).append(')');
                code = code.substring(idlen);
                if (n > 0) {
                    n -= idlen;
                    if (code.length() <= n)
                        break;
                    buf.append(removeFNC1(code.substring(0, n)));
                    code = code.substring(n);
                }
                else {
                    int idx = code.indexOf(FNC1);
                    if (idx < 0)
                        break;
                    buf.append(code.substring(0,idx));
                    code = code.substring(idx + 1);
                }
            }
        }
        catch (Exception e) {
            //empty
        }
        buf.append(removeFNC1(code));
        return buf.toString();
    }
    
    /** Returns <CODE>true</CODE> if the next <CODE>numDigits</CODE>
     * starting from index <CODE>textIndex</CODE> are numeric skipping any FNC1.
     * @param text the text to check
     * @param textIndex where to check from
     * @param numDigits the number of digits to check
     * @return the check result
     */    
    static boolean isNextDigits(String text, int textIndex, int numDigits) {
        int len = text.length();
        while (textIndex < len && numDigits > 0) {
            if (text.charAt(textIndex) == FNC1) {
                ++textIndex;
                continue;
            }
            int n = Math.min(2, numDigits);
            if (textIndex + n > len)
                return false;
            while (n-- > 0) {
                char c = text.charAt(textIndex++);
                if (c < '0' || c > '9')
                    return false;
                --numDigits;
            }
        }
        return numDigits == 0;
    }
    
    /** Packs the digits for charset C also considering FNC1. It assumes that all the parameters
     * are valid.
     * @param text the text to pack
     * @param textIndex where to pack from
     * @param numDigits the number of digits to pack. It is always an even number
     * @return the packed digits, two digits per character
     */    
    static String getPackedRawDigits(String text, int textIndex, int numDigits) {
        String out = "";
        int start = textIndex;
        while (numDigits > 0) {
            if (text.charAt(textIndex) == FNC1) {
                out += FNC1_INDEX;
                ++textIndex;
                continue;
            }
            numDigits -= 2;
            int c1 = text.charAt(textIndex++) - '0';
            int c2 = text.charAt(textIndex++) - '0';
            out += (char)(c1 * 10 + c2);
        }
        return (char)(textIndex - start) + out;
    }
    
    /** Converts the human readable text to the characters needed to
     * create a barcode. Some optimization is done to get the shortest code.
     * @param text the text to convert
     * @param ucc <CODE>true</CODE> if it is an UCC/EAN-128. In this case
     * the character FNC1 is added
     * @return the code ready to be fed to getBarsCode128Raw()
     */    
    public static String getRawText(String text, boolean ucc) {
        String out = "";
        int tLen = text.length();
        if (tLen == 0) {
            out += START_B;
            if (ucc)
                out += FNC1_INDEX;
            return out;
        }
        int c = 0;
        for (int k = 0; k < tLen; ++k) {
            c = text.charAt(k);
            if (c > 127 && c != FNC1)
                throw new RuntimeException("There are illegal characters for barcode 128 in '" + text + "'.");
        }
        c = text.charAt(0);
        char currentCode = START_B;
        int index = 0;
        if (isNextDigits(text, index, 2)) {
            currentCode = START_C;
            out += currentCode;
            if (ucc)
                out += FNC1_INDEX;
            String out2 = getPackedRawDigits(text, index, 2);
            index += (int)out2.charAt(0);
            out += out2.substring(1);
        }
        else if (c < ' ') {
            currentCode = START_A;
            out += currentCode;
            if (ucc)
                out += FNC1_INDEX;
            out += (char)(c + 64);
            ++index;
        }
        else {
            out += currentCode;
            if (ucc)
                out += FNC1_INDEX;
            if (c == FNC1)
                out += FNC1_INDEX;
            else