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@@ -1,24 +1,14 @@
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1
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-import java.util.*;
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2
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-
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3
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1
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public class ROT13 {
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4
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- private int shift;
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5
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- private Map<Character, Character> cypher = new HashMap<>();
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2
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+ private String cryptKey;
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3
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+ private String alphabet = "abcdefghijklmnopqrstuvwxyz";
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4
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+
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6
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5
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7
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6
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ROT13(Character cs, Character cf) {
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8
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- shift = Math.abs((int)cs - (int)cf);
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9
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- setupHM();
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7
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+ int index = Math.abs((int)cs - (int)cf);
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8
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+ cryptKey = rotate(alphabet, alphabet.charAt(index));
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10
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9
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}
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11
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10
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12
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- ROT13(){}
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13
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-
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14
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- public void setupHM() {
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15
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- String alphabet = "abcdefghijklmnopqrstuvwxyz";
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16
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-
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17
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- for(Character c : alphabet.toCharArray()) {
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18
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- int offset = (int)c + shift > 122 ? (int)c - shift : (int)c + shift;
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19
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- cypher.put(c, (char)offset);
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- }
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21
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- }
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11
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+ ROT13(){ cryptKey = rotate(alphabet, 'n'); }
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12
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23
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13
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public String crypt(String text) throws UnsupportedOperationException {
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24
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14
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StringBuilder result = new StringBuilder();
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@@ -26,9 +16,9 @@ public class ROT13 {
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26
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16
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for(Character c : text.toCharArray()) {
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27
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17
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if (Character.isLetter(c)) {
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18
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if (Character.isUpperCase(c)) {
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29
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- result.append(Character.toUpperCase(cypher.get(Character.toLowerCase(c))));
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+ result.append(Character.toUpperCase(cryptKey.charAt(alphabet.indexOf(Character.toLowerCase(c)))));
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20
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}
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- else result.append(cypher.get(c));
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+ else result.append(cryptKey.charAt(alphabet.indexOf(c)));
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32
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}
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else result.append(c);
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24
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}
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@@ -46,5 +36,4 @@ public class ROT13 {
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46
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36
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public static String rotate(String s, Character c) {
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47
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37
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return s.substring(s.indexOf(c)) + s.substring(0, s.indexOf(c));
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48
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38
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}
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49
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-
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39
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}
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