Coverage Summary for Class: URNGenerator (org.kitodo.persistentidentifier)

 /*
  * (c) Kitodo. Key to digital objects e. V. <contact@kitodo.org>
  *
  * This file is part of the Kitodo project.
  *
  * It is licensed under GNU General Public License version 3 or later.
  *
  * For the full copyright and license information, please read the
  * GPL3-License.txt file that was distributed with this source code.
  */
 
 package org.kitodo.persistentidentifier;
 
 import java.util.HashMap;
 
 import org.kitodo.api.persistentidentifier.urn.UnifiedResourceNameGeneratorInterface;
 
 /**
  * Class for generation and registration DBNURN identifier.
  */
 public class URNGenerator implements UnifiedResourceNameGeneratorInterface {
 
     private static final String SCHEME = "urn:nbn:de";
     private static final int URN_NBN_DE_PART_CHECKSUM = 801;
     private static final HashMap<Character, Integer> CHAR_MAP = new HashMap<>();
 
     static {
         CHAR_MAP.put('0', 1);
         CHAR_MAP.put('1', 2);
         CHAR_MAP.put('2', 3);
         CHAR_MAP.put('3', 4);
         CHAR_MAP.put('4', 5);
         CHAR_MAP.put('5', 6);
         CHAR_MAP.put('6', 7);
         CHAR_MAP.put('7', 8);
         CHAR_MAP.put('8', 9);
         CHAR_MAP.put('9', 41);
         CHAR_MAP.put('a', 18);
         CHAR_MAP.put('b', 14);
         CHAR_MAP.put('c', 19);
         CHAR_MAP.put('d', 15);
         CHAR_MAP.put('e', 16);
         CHAR_MAP.put('f', 21);
         CHAR_MAP.put('g', 22);
         CHAR_MAP.put('h', 23);
         CHAR_MAP.put('i', 24);
         CHAR_MAP.put('j', 25);
         CHAR_MAP.put('k', 42);
         CHAR_MAP.put('l', 26);
         CHAR_MAP.put('m', 27);
         CHAR_MAP.put('n', 13);
         CHAR_MAP.put('o', 28);
         CHAR_MAP.put('p', 29);
         CHAR_MAP.put('q', 31);
         CHAR_MAP.put('r', 12);
         CHAR_MAP.put('s', 32);
         CHAR_MAP.put('t', 33);
         CHAR_MAP.put('u', 11);
         CHAR_MAP.put('v', 34);
         CHAR_MAP.put('w', 35);
         CHAR_MAP.put('x', 36);
         CHAR_MAP.put('y', 37);
         CHAR_MAP.put('z', 38);
         CHAR_MAP.put('+', 49);
         CHAR_MAP.put(':', 17);
         CHAR_MAP.put('-', 39);
         CHAR_MAP.put('/', 45);
         CHAR_MAP.put('_', 43);
         CHAR_MAP.put('.', 47);
     }
 
     /**
      * Generate DBNURN identifier. According to this what displays Kitodo
      * Presentation: URN: urn:nbn:de:bsz:14-db-id3787048428 Persistente URL:
      * http://digital.slub-dresden.de/id378704842 SLUB-Katalog (PPN): 378704842
      * SWB-Katalog (PPN): 378704842
      *
      * @param namespace
      *            the URN-namespace (usually unique within an organisation).
      * @param libraryIdentifier
      *            the library identifier.
      * @param subNamespace
      *            the sub namespace.
      * @param identifier
      *            the identifier of the specific object to which the URN points.
      * @return generated URN
      */
     @Override
     public String generate(String namespace, String libraryIdentifier, String subNamespace, String identifier) {
         String urn = namespace + ':' + libraryIdentifier + '-' + subNamespace + "-" + identifier;
         return SCHEME + ':' + urn + getCheckDigit(urn);
     }
 
     @Override
     public boolean register(String urn) {
         throw new UnsupportedOperationException();
     }
 
     /**
      * Get check digit for URN.
      *
      * {@see http://www.persistent-identifier.de/?link=316}
      * {@see http://nbn-resolving.de/nbncheckdigit.php}
      *
      * @param urn
      *            a generated identifier
      * @return check digit
      */
     private String getCheckDigit(final String urn) {
         int sum = URN_NBN_DE_PART_CHECKSUM;
         int index = 22;
         int charCode = 0;
         for (Character c : urn.toCharArray()) {
             charCode = CHAR_MAP.get(c);
             if (charCode < 10) {
                 sum += charCode * ++index;
             } else {
                 sum += (charCode / 10 * ++index) + (charCode % 10 * ++index);
             }
         }
         int lastDigit = ((charCode < 10) ? (charCode) : (charCode % 10));
         if (lastDigit != 0) {
             int checkDigit = (sum / lastDigit) % 10;
             return String.valueOf(checkDigit);
         }
         return "";
     }
 }