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/* * Copyright 2001-2004 The Apache Software Foundation. * * Licensed 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 org1.apache.commons.codec.language; import org1.apache.commons.codec.EncoderException; import org1.apache.commons.codec.StringEncoder; /** * Encodes a string into a double metaphone value. * This Implementation is based on the algorithm by <CITE>Lawrence Philips</CITE>. * <ul> * <li>Original Article: <a * href="http://www.cuj.com/documents/s=8038/cuj0006philips/"> * http://www.cuj.com/documents/s=8038/cuj0006philips/</a></li> * <li>Original Source Code: <a href="ftp://ftp.cuj.com/pub/2000/1806/philips.zip"> * ftp://ftp.cuj.com/pub/2000/1806/philips.zip</a></li> * </ul> * * @author Apache Software Foundation * @version $Id: DoubleMetaphone.java,v 1.24 2004/06/05 18:32:04 ggregory Exp $ */ public class DoubleMetaphone implements StringEncoder { /** * "Vowels" to test for */ private static final String VOWELS = "AEIOUY"; /** * Prefixes when present which are not pronounced */ private static final String[] SILENT_START = { "GN", "KN", "PN", "WR", "PS" }; private static final String[] L_R_N_M_B_H_F_V_W_SPACE = { "L", "R", "N", "M", "B", "H", "F", "V", "W", " " }; private static final String[] ES_EP_EB_EL_EY_IB_IL_IN_IE_EI_ER = { "ES", "EP", "EB", "EL", "EY", "IB", "IL", "IN", "IE", "EI", "ER" }; private static final String[] L_T_K_S_N_M_B_Z = { "L", "T", "K", "S", "N", "M", "B", "Z" }; /** * Maximum length of an encoding, default is 4 */ protected int maxCodeLen = 4; /** * Creates an instance of this DoubleMetaphone encoder */ public DoubleMetaphone() { super(); } /** * Encode a value with Double Metaphone * * @param value String to encode * @return an encoded string */ public String doubleMetaphone(String value) { return doubleMetaphone(value, false); } /** * Encode a value with Double Metaphone, optionally using the alternate * encoding. * * @param value String to encode * @param alternate use alternate encode * @return an encoded string */ public String doubleMetaphone(String value, boolean alternate) { value = cleanInput(value); if (value == null) { return null; } boolean slavoGermanic = isSlavoGermanic(value); int index = isSilentStart(value) ? 1 : 0; DoubleMetaphoneResult result = new DoubleMetaphoneResult(this.getMaxCodeLen()); while (!result.isComplete() && index <= value.length() - 1) { switch (value.charAt(index)) { case 'A': case 'E': case 'I': case 'O': case 'U': case 'Y': index = handleAEIOUY(value, result, index); break; case 'B': result.append('P'); index = charAt(value, index + 1) == 'B' ? index + 2 : index + 1; break; case '\u00C7': // A C with a Cedilla result.append('S'); index++; break; case 'C': index = handleC(value, result, index); break; case 'D': index = handleD(value, result, index); break; case 'F': result.append('F'); index = charAt(value, index + 1) == 'F' ? index + 2 : index + 1; break; case 'G': index = handleG(value, result, index, slavoGermanic); break; case 'H': index = handleH(value, result, index); break; case 'J': index = handleJ(value, result, index, slavoGermanic); break; case 'K': result.append('K'); index = charAt(value, index + 1) == 'K' ? index + 2 : index + 1; break; case 'L': index = handleL(value, result, index); break; case 'M': result.append('M'); index = conditionM0(value, index) ? index + 2 : index + 1; break; case 'N': result.append('N'); index = charAt(value, index + 1) == 'N' ? index + 2 : index + 1; break; case '\u00D1': // N with a tilde (spanish ene) result.append('N'); index++; break; case 'P': index = handleP(value, result, index); break; case 'Q': result.append('K'); index = charAt(value, index + 1) == 'Q' ? index + 2 : index + 1; break; case 'R': index = handleR(value, result, index, slavoGermanic); break; case 'S': index = handleS(value, result, index, slavoGermanic); break; case 'T': index = handleT(value, result, index); break; case 'V': result.append('F'); index = charAt(value, index + 1) == 'V' ? index + 2 : index + 1; break; case 'W': index = handleW(value, result, index); break; case 'X': index = handleX(value, result, index); break; case 'Z': index = handleZ(value, result, index, slavoGermanic); break; default: index++; break; } } return alternate ? result.getAlternate() : result.getPrimary(); } /** * Encode the value using DoubleMetaphone. It will only work if * <code>obj</code> is a <code>String</code> (like <code>Metaphone</code>). * * @param obj Object to encode (should be of type String) * @return An encoded Object (will be of type String) * @throws EncoderException encode parameter is not of type String */ public Object encode(Object obj) throws EncoderException { if (!(obj instanceof String)) { throw new EncoderException("DoubleMetaphone encode parameter is not of type String"); } return doubleMetaphone((String) obj); } /** * Encode the value using DoubleMetaphone. * * @param value String to encode * @return An encoded String */ public String encode(String value) { return doubleMetaphone(value); } /** * Check if the Double Metaphone values of two <code>String</code> values * are equal. * * @param value1 The left-hand side of the encoded {@link String#equals(Object)}. * @param value2 The right-hand side of the encoded {@link String#equals(Object)}. * @return <code>true</code> if the encoded <code>String</code>s are equal; * <code>false</code> otherwise. * @see #isDoubleMetaphoneEqual(String,String,boolean)