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An open-source barcode generator written entirely in Java, supporting over 50 encoding standards including all ISO standards.

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/*
 * Copyright 2015 Robin Stuart
 *
 * 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 uk.org.okapibarcode.backend;

/**
 * Calculate NVE-18 (Nummer der Versandeinheit)
 * Also SSCC-18 (Serial Shipping Container Code)
 * 

 * Encodes a 17 digit number, adding a Modulo-10 check digit.
 *
 * @author Robin Stuart
 */
public class Nve18 extends Symbol {
        
    @Override
    public boolean encode() {
        String gs1Equivalent = "";
        int zeroes;
        int count = 0;
        int c, cdigit;
        int p = 0;       
        Code128 code128 = new Code128();
        
        if (content.length() > 17) {
            error_msg = "Input data too long";
            return false;
        }
        
        if (!(content.matches("[0-9]+"))) {
            error_msg = "Invalid characters in input";
            return false;
        }
    
        // Add leading zeroes
        zeroes = 17 - content.length();
        for(int i = 0; i < zeroes; i++) {
            gs1Equivalent += "0";
        }
        
        gs1Equivalent += content;
        
        // Add Modulus-10 check digit
        for (int i = gs1Equivalent.length() - 1; i >= 0; i--) {
            c = Character.getNumericValue(gs1Equivalent.charAt(i));
            if ((p % 2) == 0) {
                c = c * 3;
            }
            count += c;
            p++;
        }
        cdigit = 10 - (count % 10);
        if (cdigit == 10) {
            cdigit = 0;
        }

        encodeInfo += "NVE Check Digit: " + cdigit + "\n";
        
        content = "[00]" + gs1Equivalent + cdigit;
        
        // Defer to Code 128
        code128.setDataType(DataType.GS1);
        code128.setHumanReadableLocation(humanReadableLocation);
        
        try {
            code128.setContent(content);
        } catch (OkapiException e) {
            error_msg = e.getMessage();
            return false;
        }

        rectangles = code128.rectangles;
        texts = code128.texts;
        symbol_height = code128.symbol_height;
        symbol_width = code128.symbol_width;
        encodeInfo += code128.encodeInfo;
        
        return true;
    }
}