/*

  * Licensed to the Apache Software Foundation (ASF) under one or more

  * contributor license agreements.  See the NOTICE file distributed with

  * this work for additional information regarding copyright ownership.

  * The ASF licenses this file to You 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 org.apache.commons.codec.language;

 /**

  * Encodes a string into a Caverphone 1.0 value.

  *

  * This is an algorithm created by the Caversham Project at the University of Otago. It implements the Caverphone 1.0

  * algorithm:

  *

  * @version $Id: Caverphone.java 1075947 2011-03-01 17:56:14Z ggregory $

  * @see <a href="http://en.wikipedia.org/wiki/Caverphone">Wikipedia - Caverphone</a>

  * @see <a href="http://caversham.otago.ac.nz/files/working/ctp060902.pdf">Caverphone 1.0 specification</a>

  * @since 1.5

  *

  * <p>This class is immutable and thread-safe.</p>

  */

 public class Caverphone1 extends AbstractCaverphone {

     private static final String SIX_1 = "111111";

     /**

      * Encodes the given String into a Caverphone value.

      *

      * @param source

      *            String the source string

      * @return A caverphone code for the given String

      */

     @Override

     public String encode(final String source) {

         String txt = source;

         if (txt == null || txt.length() == 0) {

             return SIX_1;

         }

         // 1. Convert to lowercase

         txt = txt.toLowerCase(java.util.Locale.ENGLISH);

         // 2. Remove anything not A-Z

         txt = txt.replaceAll("[^a-z]", "");

         // 3. Handle various start options

         // 2 is a temporary placeholder to indicate a consonant which we are no longer interested in.

         txt = txt.replaceAll("^cough", "cou2f");

         txt = txt.replaceAll("^rough", "rou2f");

         txt = txt.replaceAll("^tough", "tou2f");

         txt = txt.replaceAll("^enough", "enou2f");

         txt = txt.replaceAll("^gn", "2n");

         // End

         txt = txt.replaceAll("mb$", "m2");

         // 4. Handle replacements

         txt = txt.replaceAll("cq", "2q");

         txt = txt.replaceAll("ci", "si");

         txt = txt.replaceAll("ce", "se");

         txt = txt.replaceAll("cy", "sy");

         txt = txt.replaceAll("tch", "2ch");

         txt = txt.replaceAll("c", "k");

         txt = txt.replaceAll("q", "k");

         txt = txt.replaceAll("x", "k");

         txt = txt.replaceAll("v", "f");

         txt = txt.replaceAll("dg", "2g");

         txt = txt.replaceAll("tio", "sio");

         txt = txt.replaceAll("tia", "sia");

         txt = txt.replaceAll("d", "t");

         txt = txt.replaceAll("ph", "fh");

         txt = txt.replaceAll("b", "p");

         txt = txt.replaceAll("sh", "s2");

         txt = txt.replaceAll("z", "s");

         txt = txt.replaceAll("^[aeiou]", "A");

         // 3 is a temporary placeholder marking a vowel

         txt = txt.replaceAll("[aeiou]", "3");

         txt = txt.replaceAll("3gh3", "3kh3");

         txt = txt.replaceAll("gh", "22");

         txt = txt.replaceAll("g", "k");

         txt = txt.replaceAll("s+", "S");

         txt = txt.replaceAll("t+", "T");

         txt = txt.replaceAll("p+", "P");

         txt = txt.replaceAll("k+", "K");

         txt = txt.replaceAll("f+", "F");

         txt = txt.replaceAll("m+", "M");

         txt = txt.replaceAll("n+", "N");

         txt = txt.replaceAll("w3", "W3");

         txt = txt.replaceAll("wy", "Wy"); // 1.0 only

         txt = txt.replaceAll("wh3", "Wh3");

         txt = txt.replaceAll("why", "Why"); // 1.0 only

         txt = txt.replaceAll("w", "2");

         txt = txt.replaceAll("^h", "A");

         txt = txt.replaceAll("h", "2");

         txt = txt.replaceAll("r3", "R3");

         txt = txt.replaceAll("ry", "Ry"); // 1.0 only

         txt = txt.replaceAll("r", "2");

         txt = txt.replaceAll("l3", "L3");

         txt = txt.replaceAll("ly", "Ly"); // 1.0 only

         txt = txt.replaceAll("l", "2");

         txt = txt.replaceAll("j", "y"); // 1.0 only

         txt = txt.replaceAll("y3", "Y3"); // 1.0 only

         txt = txt.replaceAll("y", "2"); // 1.0 only

         // 5. Handle removals

         txt = txt.replaceAll("2", "");

         txt = txt.replaceAll("3", "");

         // 6. put ten 1s on the end

         txt = txt + SIX_1;

         // 7. take the first six characters as the code

         return txt.substring(0, SIX_1.length());

     }

 }