|
Commons Codec example source code file (DoubleMetaphone.java)
This example Commons Codec source code file (DoubleMetaphone.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.
The Commons Codec DoubleMetaphone.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 double metaphone value.
* This Implementation is based on the algorithm by <CITE>Lawrence Philips</CITE>.
* @author Apache Software Foundation
* @version $Id: DoubleMetaphone.java 800153 2009-08-02 22:45:30Z ggregory $
*/
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 is a String (like Metaphone ).
*
* @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 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 if the encoded String s are equal;
* <code>false otherwise.
* @see #isDoubleMetaphoneEqual(String,String,boolean)
*/
public boolean isDoubleMetaphoneEqual(String value1, String value2) {
return isDoubleMetaphoneEqual(value1, value2, false);
}
/**
* Check if the Double Metaphone values of two <code>String values
* are equal, optionally using the alternate value.
*
* @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)}.
* @param alternate use the alternate value if <code>true.
* @return <code>true if the encoded String s are equal;
* <code>false otherwise.
*/
public boolean isDoubleMetaphoneEqual(String value1,
String value2,
boolean alternate) {
return doubleMetaphone(value1, alternate).equals(doubleMetaphone
(value2, alternate));
}
/**
* Returns the maxCodeLen.
* @return int
*/
public int getMaxCodeLen() {
return this.maxCodeLen;
}
/**
* Sets the maxCodeLen.
* @param maxCodeLen The maxCodeLen to set
*/
public void setMaxCodeLen(int maxCodeLen) {
this.maxCodeLen = maxCodeLen;
}
//-- BEGIN HANDLERS --//
/**
* Handles 'A', 'E', 'I', 'O', 'U', and 'Y' cases
*/
private int handleAEIOUY(String value, DoubleMetaphoneResult result, int
index) {
if (index == 0) {
result.append('A');
}
return index + 1;
}
/**
* Handles 'C' cases
*/
private int handleC(String value,
DoubleMetaphoneResult result,
int index) {
if (conditionC0(value, index)) { // very confusing, moved out
result.append('K');
index += 2;
} else if (index == 0 && contains(value, index, 6, "CAESAR")) {
result.append('S');
index += 2;
} else if (contains(value, index, 2, "CH")) {
index = handleCH(value, result, index);
} else if (contains(value, index, 2, "CZ") &&
!contains(value, index - 2, 4, "WICZ")) {
//-- "Czerny" --//
result.append('S', 'X');
index += 2;
} else if (contains(value, index + 1, 3, "CIA")) {
//-- "focaccia" --//
result.append('X');
index += 3;
} else if (contains(value, index, 2, "CC") &&
!(index == 1 && charAt(value, 0) == 'M')) {
//-- double "cc" but not "McClelland" --//
return handleCC(value, result, index);
} else if (contains(value, index, 2, "CK", "CG", "CQ")) {
result.append('K');
index += 2;
} else if (contains(value, index, 2, "CI", "CE", "CY")) {
//-- Italian vs. English --//
if (contains(value, index, 3, "CIO", "CIE", "CIA")) {
result.append('S', 'X');
} else {
result.append('S');
}
index += 2;
} else {
result.append('K');
if (contains(value, index + 1, 2, " C", " Q", " G")) {
//-- Mac Caffrey, Mac Gregor --//
index += 3;
} else if (contains(value, index + 1, 1, "C", "K", "Q") &&
!contains(value, index + 1, 2, "CE", "CI")) {
index += 2;
} else {
index++;
}
}
return index;
}
/**
* Handles 'CC' cases
*/
private int handleCC(String value,
DoubleMetaphoneResult result,
int index) {
if (contains(value, index + 2, 1, "I", "E", "H") &&
!contains(value, index + 2, 2, "HU")) {
//-- "bellocchio" but not "bacchus" --//
if ((index == 1 && charAt(value, index - 1) == 'A') ||
contains(value, index - 1, 5, "UCCEE", "UCCES")) {
//-- "accident", "accede", "succeed" --//
result.append("KS");
} else {
//-- "bacci", "bertucci", other Italian --//
result.append('X');
}
index += 3;
} else { // Pierce's rule
result.append('K');
index += 2;
}
return index;
}
/**
* Handles 'CH' cases
*/
private int handleCH(String value,
DoubleMetaphoneResult result,
int index) {
if (index > 0 && contains(value, index, 4, "CHAE")) { // Michael
result.append('K', 'X');
return index + 2;
} else if (conditionCH0(value, index)) {
//-- Greek roots ("chemistry", "chorus", etc.) --//
result.append('K');
return index + 2;
} else if (conditionCH1(value, index)) {
//-- Germanic, Greek, or otherwise 'ch' for 'kh' sound --//
result.append('K');
return index + 2;
} else {
if (index > 0) {
if (contains(value, 0, 2, "MC")) {
result.append('K');
} else {
result.append('X', 'K');
}
} else {
result.append('X');
}
return index + 2;
}
}
/**
* Handles 'D' cases
*/
private int handleD(String value,
DoubleMetaphoneResult result,
int index) {
if (contains(value, index, 2, "DG")) {
//-- "Edge" --//
if (contains(value, index + 2, 1, "I", "E", "Y")) {
result.append('J');
index += 3;
//-- "Edgar" --//
} else {
result.append("TK");
index += 2;
}
} else if (contains(value, index, 2, "DT", "DD")) {
result.append('T');
index += 2;
} else {
result.append('T');
index++;
}
return index;
}
/**
* Handles 'G' cases
*/
private int handleG(String value,
DoubleMetaphoneResult result,
int index,
boolean slavoGermanic) {
if (charAt(value, index + 1) == 'H') {
index = handleGH(value, result, index);
} else if (charAt(value, index + 1) == 'N') {
if (index == 1 && isVowel(charAt(value, 0)) && !slavoGermanic) {
result.append("KN", "N");
} else if (!contains(value, index + 2, 2, "EY") &&
charAt(value, index + 1) != 'Y' && !slavoGermanic) {
result.append("N", "KN");
} else {
result.append("KN");
}
index = index + 2;
} else if (contains(value, index + 1, 2, "LI") && !slavoGermanic) {
result.append("KL", "L");
index += 2;
} else if (index == 0 && (charAt(value, index + 1) == 'Y' || contains(value, index + 1, 2, ES_EP_EB_EL_EY_IB_IL_IN_IE_EI_ER))) {
//-- -ges-, -gep-, -gel-, -gie- at beginning --//
result.append('K', 'J');
index += 2;
} else if ((contains(value, index + 1, 2, "ER") ||
charAt(value, index + 1) == 'Y') &&
!contains(value, 0, 6, "DANGER", "RANGER", "MANGER") &&
!contains(value, index - 1, 1, "E", "I") &&
!contains(value, index - 1, 3, "RGY", "OGY")) {
//-- -ger-, -gy- --//
result.append('K', 'J');
index += 2;
} else if (contains(value, index + 1, 1, "E", "I", "Y") ||
contains(value, index - 1, 4, "AGGI", "OGGI")) {
//-- Italian "biaggi" --//
if ((contains(value, 0 ,4, "VAN ", "VON ") || contains(value, 0, 3, "SCH")) || contains(value, index + 1, 2, "ET")) {
//-- obvious germanic --//
result.append('K');
} else if (contains(value, index + 1, 3, "IER")) {
result.append('J');
} else {
result.append('J', 'K');
}
index += 2;
} else if (charAt(value, index + 1) == 'G') {
index += 2;
result.append('K');
} else {
index++;
result.append('K');
}
return index;
}
/**
* Handles 'GH' cases
*/
private int handleGH(String value,
DoubleMetaphoneResult result,
int index) {
if (index > 0 && !isVowel(charAt(value, index - 1))) {
result.append('K');
index += 2;
} else if (index == 0) {
if (charAt(value, index + 2) == 'I') {
result.append('J');
} else {
result.append('K');
}
index += 2;
} else if ((index > 1 && contains(value, index - 2, 1, "B", "H", "D")) ||
(index > 2 && contains(value, index - 3, 1, "B", "H", "D")) ||
(index > 3 && contains(value, index - 4, 1, "B", "H"))) {
//-- Parker's rule (with some further refinements) - "hugh"
index += 2;
} else {
if (index > 2 && charAt(value, index - 1) == 'U' &&
contains(value, index - 3, 1, "C", "G", "L", "R", "T")) {
//-- "laugh", "McLaughlin", "cough", "gough", "rough", "tough"
result.append('F');
} else if (index > 0 && charAt(value, index - 1) != 'I') {
result.append('K');
}
index += 2;
}
return index;
}
/**
* Handles 'H' cases
*/
private int handleH(String value,
DoubleMetaphoneResult result,
int index) {
//-- only keep if first & before vowel or between 2 vowels --//
if ((index == 0 || isVowel(charAt(value, index - 1))) &&
isVowel(charAt(value, index + 1))) {
result.append('H');
index += 2;
//-- also takes car of "HH" --//
} else {
index++;
}
return index;
}
/**
* Handles 'J' cases
*/
private int handleJ(String value, DoubleMetaphoneResult result, int index,
boolean slavoGermanic) {
if (contains(value, index, 4, "JOSE") || contains(value, 0, 4, "SAN ")) {
//-- obvious Spanish, "Jose", "San Jacinto" --//
if ((index == 0 && (charAt(value, index + 4) == ' ') ||
value.length() == 4) || contains(value, 0, 4, "SAN ")) {
result.append('H');
} else {
result.append('J', 'H');
}
index++;
} else {
if (index == 0 && !contains(value, index, 4, "JOSE")) {
result.append('J', 'A');
} else if (isVowel(charAt(value, index - 1)) && !slavoGermanic &&
(charAt(value, index + 1) == 'A' || charAt(value, index + 1) == 'O')) {
result.append('J', 'H');
} else if (index == value.length() - 1) {
result.append('J', ' ');
} else if (!contains(value, index + 1, 1, L_T_K_S_N_M_B_Z) && !contains(value, index - 1, 1, "S", "K", "L")) {
result.append('J');
}
if (charAt(value, index + 1) == 'J') {
index += 2;
} else {
index++;
}
}
return index;
}
/**
* Handles 'L' cases
*/
private int handleL(String value,
DoubleMetaphoneResult result,
int index) {
if (charAt(value, index + 1) == 'L') {
if (conditionL0(value, index)) {
result.appendPrimary('L');
} else {
result.append('L');
}
index += 2;
} else {
index++;
result.append('L');
}
return index;
}
/**
* Handles 'P' cases
*/
private int handleP(String value,
DoubleMetaphoneResult result,
int index) {
if (charAt(value, index + 1) == 'H') {
result.append('F');
index += 2;
} else {
result.append('P');
index = contains(value, index + 1, 1, "P", "B") ? index + 2 : index + 1;
}
return index;
}
/**
* Handles 'R' cases
*/
private int handleR(String value,
DoubleMetaphoneResult result,
int index,
boolean slavoGermanic) {
if (index == value.length() - 1 && !slavoGermanic &&
contains(value, index - 2, 2, "IE") &&
!contains(value, index - 4, 2, "ME", "MA")) {
result.appendAlternate('R');
} else {
result.append('R');
}
return charAt(value, index + 1) == 'R' ? index + 2 : index + 1;
}
/**
* Handles 'S' cases
*/
private int handleS(String value,
DoubleMetaphoneResult result,
int index,
boolean slavoGermanic) {
if (contains(value, index - 1, 3, "ISL", "YSL")) {
//-- special cases "island", "isle", "carlisle", "carlysle" --//
index++;
} else if (index == 0 && contains(value, index, 5, "SUGAR")) {
//-- special case "sugar-" --//
result.append('X', 'S');
index++;
} else if (contains(value, index, 2, "SH")) {
if (contains(value, index + 1, 4,
"HEIM", "HOEK", "HOLM", "HOLZ")) {
//-- germanic --//
result.append('S');
} else {
result.append('X');
}
index += 2;
} else if (contains(value, index, 3, "SIO", "SIA") || contains(value, index, 4, "SIAN")) {
//-- Italian and Armenian --//
if (slavoGermanic) {
result.append('S');
} else {
result.append('S', 'X');
}
index += 3;
} else if ((index == 0 && contains(value, index + 1, 1, "M", "N", "L", "W")) || contains(value, index + 1, 1, "Z")) {
//-- german & anglicisations, e.g. "smith" match "schmidt" //
// "snider" match "schneider" --//
//-- also, -sz- in slavic language altho in hungarian it //
// is pronounced "s" --//
result.append('S', 'X');
index = contains(value, index + 1, 1, "Z") ? index + 2 : index + 1;
} else if (contains(value, index, 2, "SC")) {
index = handleSC(value, result, index);
} else {
if (index == value.length() - 1 && contains(value, index - 2,
2, "AI", "OI")){
//-- french e.g. "resnais", "artois" --//
result.appendAlternate('S');
} else {
result.append('S');
}
index = contains(value, index + 1, 1, "S", "Z") ? index + 2 : index + 1;
}
return index;
}
/**
* Handles 'SC' cases
*/
private int handleSC(String value,
DoubleMetaphoneResult result,
int index) {
if (charAt(value, index + 2) == 'H') {
//-- Schlesinger's rule --//
if (contains(value, index + 3,
2, "OO", "ER", "EN", "UY", "ED", "EM")) {
//-- Dutch origin, e.g. "school", "schooner" --//
if (contains(value, index + 3, 2, "ER", "EN")) {
//-- "schermerhorn", "schenker" --//
result.append("X", "SK");
} else {
result.append("SK");
}
} else {
if (index == 0 && !isVowel(charAt(value, 3)) && charAt(value, 3) != 'W') {
result.append('X', 'S');
} else {
result.append('X');
}
}
} else if (contains(value, index + 2, 1, "I", "E", "Y")) {
result.append('S');
} else {
result.append("SK");
}
return index + 3;
}
/**
* Handles 'T' cases
*/
private int handleT(String value,
DoubleMetaphoneResult result,
int index) {
if (contains(value, index, 4, "TION")) {
result.append('X');
index += 3;
} else if (contains(value, index, 3, "TIA", "TCH")) {
result.append('X');
index += 3;
} else if (contains(value, index, 2, "TH") || contains(value, index,
3, "TTH")) {
if (contains(value, index + 2, 2, "OM", "AM") ||
//-- special case "thomas", "thames" or germanic --//
contains(value, 0, 4, "VAN ", "VON ") ||
contains(value, 0, 3, "SCH")) {
result.append('T');
} else {
result.append('0', 'T');
}
index += 2;
} else {
result.append('T');
index = contains(value, index + 1, 1, "T", "D") ? index + 2 : index + 1;
}
return index;
}
/**
* Handles 'W' cases
*/
private int handleW(String value,
DoubleMetaphoneResult result,
int index) {
if (contains(value, index, 2, "WR")) {
//-- can also be in middle of word --//
result.append('R');
index += 2;
} else {
if (index == 0 && (isVowel(charAt(value, index + 1)) ||
contains(value, index, 2, "WH"))) {
if (isVowel(charAt(value, index + 1))) {
//-- Wasserman should match Vasserman --//
result.append('A', 'F');
} else {
//-- need Uomo to match Womo --//
result.append('A');
}
index++;
} else if ((index == value.length() - 1 && isVowel(charAt(value, index - 1))) ||
contains(value, index - 1,
5, "EWSKI", "EWSKY", "OWSKI", "OWSKY") ||
contains(value, 0, 3, "SCH")) {
//-- Arnow should match Arnoff --//
result.appendAlternate('F');
index++;
} else if (contains(value, index, 4, "WICZ", "WITZ")) {
//-- Polish e.g. "filipowicz" --//
result.append("TS", "FX");
index += 4;
} else {
index++;
}
}
return index;
}
/**
* Handles 'X' cases
*/
private int handleX(String value,
DoubleMetaphoneResult result,
int index) {
if (index == 0) {
result.append('S');
index++;
} else {
if (!((index == value.length() - 1) &&
(contains(value, index - 3, 3, "IAU", "EAU") ||
contains(value, index - 2, 2, "AU", "OU")))) {
//-- French e.g. breaux --//
result.append("KS");
}
index = contains(value, index + 1, 1, "C", "X") ? index + 2 : index + 1;
}
return index;
}
/**
* Handles 'Z' cases
*/
private int handleZ(String value, DoubleMetaphoneResult result, int index,
boolean slavoGermanic) {
if (charAt(value, index + 1) == 'H') {
//-- Chinese pinyin e.g. "zhao" or Angelina "Zhang" --//
result.append('J');
index += 2;
} else {
if (contains(value, index + 1, 2, "ZO", "ZI", "ZA") || (slavoGermanic && (index > 0 && charAt(value, index - 1) != 'T'))) {
result.append("S", "TS");
} else {
result.append('S');
}
index = charAt(value, index + 1) == 'Z' ? index + 2 : index + 1;
}
return index;
}
//-- BEGIN CONDITIONS --//
/**
* Complex condition 0 for 'C'
*/
private boolean conditionC0(String value, int index) {
if (contains(value, index, 4, "CHIA")) {
return true;
} else if (index <= 1) {
return false;
} else if (isVowel(charAt(value, index - 2))) {
return false;
} else if (!contains(value, index - 1, 3, "ACH")) {
return false;
} else {
char c = charAt(value, index + 2);
return (c != 'I' && c != 'E') ||
contains(value, index - 2, 6, "BACHER", "MACHER");
}
}
/**
* Complex condition 0 for 'CH'
*/
private boolean conditionCH0(String value, int index) {
if (index != 0) {
return false;
} else if (!contains(value, index + 1, 5, "HARAC", "HARIS") &&
!contains(value, index + 1, 3, "HOR", "HYM", "HIA", "HEM")) {
return false;
} else if (contains(value, 0, 5, "CHORE")) {
return false;
} else {
return true;
}
}
/**
* Complex condition 1 for 'CH'
*/
private boolean conditionCH1(String value, int index) {
return ((contains(value, 0, 4, "VAN ", "VON ") || contains(value, 0,
3, "SCH")) ||
contains(value, index - 2, 6, "ORCHES", "ARCHIT", "ORCHID") ||
contains(value, index + 2, 1, "T", "S") ||
((contains(value, index - 1, 1, "A", "O", "U", "E") || index == 0) &&
(contains(value, index + 2, 1, L_R_N_M_B_H_F_V_W_SPACE) || index + 1 == value.length() - 1)));
}
/**
* Complex condition 0 for 'L'
*/
private boolean conditionL0(String value, int index) {
if (index == value.length() - 3 &&
contains(value, index - 1, 4, "ILLO", "ILLA", "ALLE")) {
return true;
} else if ((contains(value, value.length() - 2, 2, "AS", "OS") ||
contains(value, value.length() - 1, 1, "A", "O")) &&
contains(value, index - 1, 4, "ALLE")) {
return true;
} else {
return false;
}
}
/**
* Complex condition 0 for 'M'
*/
private boolean conditionM0(String value, int index) {
if (charAt(value, index + 1) == 'M') {
return true;
}
return contains(value, index - 1, 3, "UMB") &&
((index + 1) == value.length() - 1 || contains(value,
index + 2, 2, "ER"));
}
//-- BEGIN HELPER FUNCTIONS --//
/**
* Determines whether or not a value is of slavo-germanic orgin. A value is
* of slavo-germanic origin if it contians any of 'W', 'K', 'CZ', or 'WITZ'.
*/
private boolean isSlavoGermanic(String value) {
return value.indexOf('W') > -1 || value.indexOf('K') > -1 ||
value.indexOf("CZ") > -1 || value.indexOf("WITZ") > -1;
}
/**
* Determines whether or not a character is a vowel or not
*/
private boolean isVowel(char ch) {
return VOWELS.indexOf(ch) != -1;
}
/**
* Determines whether or not the value starts with a silent letter. It will
* return <code>true if the value starts with any of 'GN', 'KN',
* 'PN', 'WR' or 'PS'.
*/
private boolean isSilentStart(String value) {
boolean result = false;
for (int i = 0; i < SILENT_START.length; i++) {
if (value.startsWith(SILENT_START[i])) {
result = true;
break;
}
}
return result;
}
/**
* Cleans the input
*/
private String cleanInput(String input) {
if (input == null) {
return null;
}
input = input.trim();
if (input.length() == 0) {
return null;
}
return input.toUpperCase(java.util.Locale.ENGLISH);
}
/**
* Gets the character at index <code>index if available, otherwise
* it returns <code>Character.MIN_VALUE so that there is some sort
* of a default
*/
protected char charAt(String value, int index) {
if (index < 0 || index >= value.length()) {
return Character.MIN_VALUE;
}
return value.charAt(index);
}
/**
* Shortcut method with 1 criteria
*/
private static boolean contains(String value, int start, int length,
String criteria) {
return contains(value, start, length,
new String[] { criteria });
}
/**
* Shortcut method with 2 criteria
*/
private static boolean contains(String value, int start, int length,
String criteria1, String criteria2) {
return contains(value, start, length,
new String[] { criteria1, criteria2 });
}
/**
* Shortcut method with 3 criteria
*/
private static boolean contains(String value, int start, int length,
String criteria1, String criteria2,
String criteria3) {
return contains(value, start, length,
new String[] { criteria1, criteria2, criteria3 });
}
/**
* Shortcut method with 4 criteria
*/
private static boolean contains(String value, int start, int length,
String criteria1, String criteria2,
String criteria3, String criteria4) {
return contains(value, start, length,
new String[] { criteria1, criteria2, criteria3,
criteria4 });
}
/**
* Shortcut method with 5 criteria
*/
private static boolean contains(String value, int start, int length,
String criteria1, String criteria2,
String criteria3, String criteria4,
String criteria5) {
return contains(value, start, length,
new String[] { criteria1, criteria2, criteria3,
criteria4, criteria5 });
}
/**
* Shortcut method with 6 criteria
*/
private static boolean contains(String value, int start, int length,
String criteria1, String criteria2,
String criteria3, String criteria4,
String criteria5, String criteria6) {
return contains(value, start, length,
new String[] { criteria1, criteria2, criteria3,
criteria4, criteria5, criteria6 });
}
/**
* Determines whether <code>value contains any of the criteria starting at index start and
* matching up to length <code>length
*/
protected static boolean contains(String value, int start, int length,
String[] criteria) {
boolean result = false;
if (start >= 0 && start + length <= value.length()) {
String target = value.substring(start, start + length);
for (int i = 0; i < criteria.length; i++) {
if (target.equals(criteria[i])) {
result = true;
break;
}
}
}
return result;
}
//-- BEGIN INNER CLASSES --//
/**
* Inner class for storing results, since there is the optional alternate
* encoding.
*/
public class DoubleMetaphoneResult {
private StringBuffer primary = new StringBuffer(getMaxCodeLen());
private StringBuffer alternate = new StringBuffer(getMaxCodeLen());
private int maxLength;
public DoubleMetaphoneResult(int maxLength) {
this.maxLength = maxLength;
}
public void append(char value) {
appendPrimary(value);
appendAlternate(value);
}
public void append(char primary, char alternate) {
appendPrimary(primary);
appendAlternate(alternate);
}
public void appendPrimary(char value) {
if (this.primary.length() < this.maxLength) {
this.primary.append(value);
}
}
public void appendAlternate(char value) {
if (this.alternate.length() < this.maxLength) {
this.alternate.append(value);
}
}
public void append(String value) {
appendPrimary(value);
appendAlternate(value);
}
public void append(String primary, String alternate) {
appendPrimary(primary);
appendAlternate(alternate);
}
public void appendPrimary(String value) {
int addChars = this.maxLength - this.primary.length();
if (value.length() <= addChars) {
this.primary.append(value);
} else {
this.primary.append(value.substring(0, addChars));
}
}
public void appendAlternate(String value) {
int addChars = this.maxLength - this.alternate.length();
if (value.length() <= addChars) {
this.alternate.append(value);
} else {
this.alternate.append(value.substring(0, addChars));
}
}
public String getPrimary() {
return this.primary.toString();
}
public String getAlternate() {
return this.alternate.toString();
}
public boolean isComplete() {
return this.primary.length() >= this.maxLength &&
this.alternate.length() >= this.maxLength;
}
}
}
Other Commons Codec examples (source code examples)
Here is a short list of links related to this Commons Codec DoubleMetaphone.java source code file:
|