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Commons Codec example source code file (Caverphone.java)

This example Commons Codec source code file (Caverphone.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Codec tags/keywords

a, a, caverphone, caverphone, encoderexception, encoderexception, k, l3, r3, string, string, w3, wh3, y3

The Commons Codec Caverphone.java source code

/*
 * 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;

import org.apache.commons.codec.EncoderException;
import org.apache.commons.codec.StringEncoder;

/**
 * Encodes a string into a Caverphone value.
 * 
 * This is an algorithm created the Caversham Project at the University of Otago. It implements the Caverphone 2.0
 * algorithm:
 * 
 * @author Apache Software Foundation
 * @version $Id: Caverphone.java 797690 2009-07-24 23:28:35Z ggregory $
 * @see <a href="http://en.wikipedia.org/wiki/Caverphone">Wikipedia - Caverphone
 * @see <a href="http://caversham.otago.ac.nz/files/working/ctp150804.pdf">Caverphone 2.0 specification
 * @since 1.4
 */
public class Caverphone implements StringEncoder {

    /**
     * Creates an instance of the Caverphone encoder
     */
    public Caverphone() {
        super();
    }

    /**
     * Find the caverphone value of a String. 
     *
     * @param txt String to find the caverphone code for
     * @return A caverphone code corresponding to the String supplied
     */
    public String caverphone(String txt) {
        // NOTE: Version 1.0 of Caverphone is easily derivable from this code 
        // by commenting out the 2.0 lines and adding in the 1.0 lines

        if( txt == null || txt.length() == 0 ) {
            return "1111111111";
        }

        // 1. Convert to lowercase
        txt = txt.toLowerCase(java.util.Locale.ENGLISH);

        // 2. Remove anything not A-Z
        txt = txt.replaceAll("[^a-z]", "");

        // 2.5. Remove final e
        txt = txt.replaceAll("e$", "");             // 2.0 only

        // 3. Handle various start options
        txt = txt.replaceAll("^cough", "cou2f");
        txt = txt.replaceAll("^rough", "rou2f");
        txt = txt.replaceAll("^tough", "tou2f");
        txt = txt.replaceAll("^enough", "enou2f");  // 2.0 only
        txt = txt.replaceAll("^trough", "trou2f");  // 2.0 only - note the spec says ^enough here again, c+p error I assume
        txt = txt.replaceAll("^gn", "2n");
        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");
        txt = txt.replaceAll("[aeiou]", "3");
        txt = txt.replaceAll("j", "y");        // 2.0 only
        txt = txt.replaceAll("^y3", "Y3");     // 2.0 only
        txt = txt.replaceAll("^y", "A");       // 2.0 only
        txt = txt.replaceAll("y", "3");        // 2.0 only
        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("w$", "3");       // 2.0 only
        //txt = txt.replaceAll("why", "Why");  // 1.0 only
        txt = txt.replaceAll("w", "2");
        txt = txt.replaceAll("^h", "A");
        txt = txt.replaceAll("h", "2");
        txt = txt.replaceAll("r3", "R3");
        txt = txt.replaceAll("r$", "3");       // 2.0 only
        //txt = txt.replaceAll("ry", "Ry");    // 1.0 only
        txt = txt.replaceAll("r", "2");
        txt = txt.replaceAll("l3", "L3");
        txt = txt.replaceAll("l$", "3");       // 2.0 only
        //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$", "A");       // 2.0 only
        txt = txt.replaceAll("3", "");

        // 6. put ten 1s on the end
        txt = txt + "111111" + "1111";        // 1.0 only has 6 1s

        // 7. take the first six characters as the code
        return txt.substring(0, 10);          // 1.0 truncates to 6
    }

    /**
     * Encodes an Object using the caverphone algorithm.  This method
     * is provided in order to satisfy the requirements of the
     * Encoder interface, and will throw an EncoderException if the
     * supplied object is not of type java.lang.String.
     *
     * @param pObject Object to encode
     * @return An object (or type java.lang.String) containing the 
     *         caverphone code which corresponds to the String supplied.
     * @throws EncoderException if the parameter supplied is not
     *                          of type java.lang.String
     */
    public Object encode(Object pObject) throws EncoderException {
        if (!(pObject instanceof String)) {
            throw new EncoderException("Parameter supplied to Caverphone encode is not of type java.lang.String"); 
        }
        return caverphone((String) pObject);
    }

    /**
     * Encodes a String using the Caverphone algorithm. 
     *
     * @param pString String object to encode
     * @return The caverphone code corresponding to the String supplied
     */
    public String encode(String pString) {
        return caverphone(pString);   
    }

    /**
     * Tests if the caverphones of two strings are identical.
     *
     * @param str1 First of two strings to compare
     * @param str2 Second of two strings to compare
     * @return <code>true if the caverphones of these strings are identical, 
     *        <code>false otherwise.
     */
    public boolean isCaverphoneEqual(String str1, String str2) {
        return caverphone(str1).equals(caverphone(str2));
    }

}

Other Commons Codec examples (source code examples)

Here is a short list of links related to this Commons Codec Caverphone.java source code file:

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