1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * https://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.codec.language;
19
20 /**
21 * Encodes a string into a Caverphone 1.0 value.
22 *
23 * This is an algorithm created by the Caversham Project at the University of Otago. It implements the Caverphone 1.0
24 * algorithm:
25 *
26 * @see <a href="https://en.wikipedia.org/wiki/Caverphone">Wikipedia - Caverphone</a>
27 * @see <a href="https://caversham.otago.ac.nz/files/working/ctp060902.pdf">Caverphone 1.0 specification</a>
28 * @since 1.5
29 *
30 * <p>This class is immutable and thread-safe.</p>
31 */
32 public class Caverphone1 extends AbstractCaverphone {
33
34 private static final String SIX_1 = "111111";
35
36 /**
37 * Constructs a new instance.
38 */
39 public Caverphone1() {
40 // empty
41 }
42
43 /**
44 * Encodes the given String into a Caverphone value.
45 *
46 * @param source
47 * String the source string
48 * @return A Caverphone code for the given String
49 */
50 @Override
51 public String encode(final String source) {
52 String txt = source;
53 if (txt == null || txt.isEmpty()) {
54 return SIX_1;
55 }
56
57 // 1. Convert to lowercase
58 txt = txt.toLowerCase(java.util.Locale.ENGLISH);
59
60 // 2. Remove anything not A-Z
61 txt = txt.replaceAll("[^a-z]", "");
62
63 // 3. Handle various start options
64 // 2 is a temporary placeholder to indicate a consonant which we are no longer interested in.
65 txt = txt.replaceAll("^cough", "cou2f");
66 txt = txt.replaceAll("^rough", "rou2f");
67 txt = txt.replaceAll("^tough", "tou2f");
68 txt = txt.replaceAll("^enough", "enou2f");
69 txt = txt.replaceAll("^gn", "2n");
70
71 // End
72 txt = txt.replaceAll("mb$", "m2");
73
74 // 4. Handle replacements
75 txt = txt.replace("cq", "2q");
76 txt = txt.replace("ci", "si");
77 txt = txt.replace("ce", "se");
78 txt = txt.replace("cy", "sy");
79 txt = txt.replace("tch", "2ch");
80 txt = txt.replace("c", "k");
81 txt = txt.replace("q", "k");
82 txt = txt.replace("x", "k");
83 txt = txt.replace("v", "f");
84 txt = txt.replace("dg", "2g");
85 txt = txt.replace("tio", "sio");
86 txt = txt.replace("tia", "sia");
87 txt = txt.replace("d", "t");
88 txt = txt.replace("ph", "fh");
89 txt = txt.replace("b", "p");
90 txt = txt.replace("sh", "s2");
91 txt = txt.replace("z", "s");
92 txt = txt.replaceAll("^[aeiou]", "A");
93 // 3 is a temporary placeholder marking a vowel
94 txt = txt.replaceAll("[aeiou]", "3");
95 txt = txt.replace("3gh3", "3kh3");
96 txt = txt.replace("gh", "22");
97 txt = txt.replace("g", "k");
98 txt = txt.replaceAll("s+", "S");
99 txt = txt.replaceAll("t+", "T");
100 txt = txt.replaceAll("p+", "P");
101 txt = txt.replaceAll("k+", "K");
102 txt = txt.replaceAll("f+", "F");
103 txt = txt.replaceAll("m+", "M");
104 txt = txt.replaceAll("n+", "N");
105 txt = txt.replace("w3", "W3");
106 txt = txt.replace("wy", "Wy"); // 1.0 only
107 txt = txt.replace("wh3", "Wh3");
108 txt = txt.replace("why", "Why"); // 1.0 only
109 txt = txt.replace("w", "2");
110 txt = txt.replaceAll("^h", "A");
111 txt = txt.replace("h", "2");
112 txt = txt.replace("r3", "R3");
113 txt = txt.replace("ry", "Ry"); // 1.0 only
114 txt = txt.replace("r", "2");
115 txt = txt.replace("l3", "L3");
116 txt = txt.replace("ly", "Ly"); // 1.0 only
117 txt = txt.replace("l", "2");
118 txt = txt.replace("j", "y"); // 1.0 only
119 txt = txt.replace("y3", "Y3"); // 1.0 only
120 txt = txt.replace("y", "2"); // 1.0 only
121
122 // 5. Handle removals
123 txt = txt.replace("2", "");
124 txt = txt.replace("3", "");
125
126 // 6. put six 1s on the end
127 txt += SIX_1;
128
129 // 7. take the first six characters as the code
130 return txt.substring(0, SIX_1.length());
131 }
132
133 }