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Diffstat (limited to 'src/org/apache/commons/codec/language/Soundex.java')
| -rw-r--r-- | src/org/apache/commons/codec/language/Soundex.java | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/src/org/apache/commons/codec/language/Soundex.java b/src/org/apache/commons/codec/language/Soundex.java deleted file mode 100644 index 61ce440..0000000 --- a/src/org/apache/commons/codec/language/Soundex.java +++ /dev/null @@ -1,274 +0,0 @@ -/* - * 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 org.apache.commons.codec.language; - -import org.apache.commons.codec.EncoderException; -import org.apache.commons.codec.StringEncoder; - -/** - * Encodes a string into a Soundex value. Soundex is an encoding used to relate similar names, but can also be used as a - * general purpose scheme to find word with similar phonemes. - * - * @author Apache Software Foundation - * @version $Id: Soundex.java,v 1.26 2004/07/07 23:15:24 ggregory Exp $ - */ -public class Soundex implements StringEncoder { - - /** - * An instance of Soundex using the US_ENGLISH_MAPPING mapping. - * - * @see #US_ENGLISH_MAPPING - */ - public static final Soundex US_ENGLISH = new Soundex(); - - /** - * This is a default mapping of the 26 letters used in US English. A value of <code>0</code> for a letter position - * means do not encode. - * <p> - * (This constant is provided as both an implementation convenience and to allow Javadoc to pick - * up the value for the constant values page.) - * </p> - * - * @see #US_ENGLISH_MAPPING - */ - public static final String US_ENGLISH_MAPPING_STRING = "01230120022455012623010202"; - - /** - * This is a default mapping of the 26 letters used in US English. A value of <code>0</code> for a letter position - * means do not encode. - * - * @see Soundex#Soundex(char[]) - */ - public static final char[] US_ENGLISH_MAPPING = US_ENGLISH_MAPPING_STRING.toCharArray(); - - // BEGIN android-note - // Removed @see reference to SoundexUtils below, since the class isn't - // public. - // END android-note - /** - * Encodes the Strings and returns the number of characters in the two encoded Strings that are the same. This - * return value ranges from 0 through 4: 0 indicates little or no similarity, and 4 indicates strong similarity or - * identical values. - * - * @param s1 - * A String that will be encoded and compared. - * @param s2 - * A String that will be encoded and compared. - * @return The number of characters in the two encoded Strings that are the same from 0 to 4. - * - * @see <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tsqlref/ts_de-dz_8co5.asp"> MS - * T-SQL DIFFERENCE </a> - * - * @throws EncoderException - * if an error occurs encoding one of the strings - * @since 1.3 - */ - public int difference(String s1, String s2) throws EncoderException { - return SoundexUtils.difference(this, s1, s2); - } - - /** - * The maximum length of a Soundex code - Soundex codes are only four characters by definition. - * - * @deprecated This feature is not needed since the encoding size must be constant. Will be removed in 2.0. - */ - private int maxLength = 4; - - /** - * Every letter of the alphabet is "mapped" to a numerical value. This char array holds the values to which each - * letter is mapped. This implementation contains a default map for US_ENGLISH - */ - private char[] soundexMapping; - - /** - * Creates an instance using US_ENGLISH_MAPPING - * - * @see Soundex#Soundex(char[]) - * @see Soundex#US_ENGLISH_MAPPING - */ - public Soundex() { - this(US_ENGLISH_MAPPING); - } - - /** - * Creates a soundex instance using the given mapping. This constructor can be used to provide an internationalized - * mapping for a non-Western character set. - * - * Every letter of the alphabet is "mapped" to a numerical value. This char array holds the values to which each - * letter is mapped. This implementation contains a default map for US_ENGLISH - * - * @param mapping - * Mapping array to use when finding the corresponding code for a given character - */ - public Soundex(char[] mapping) { - this.setSoundexMapping(mapping); - } - - /** - * Encodes an Object using the soundex 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 soundex code which corresponds to the String - * supplied. - * @throws EncoderException - * if the parameter supplied is not of type java.lang.String - * @throws IllegalArgumentException - * if a character is not mapped - */ - public Object encode(Object pObject) throws EncoderException { - if (!(pObject instanceof String)) { - throw new EncoderException("Parameter supplied to Soundex encode is not of type java.lang.String"); - } - return soundex((String) pObject); - } - - /** - * Encodes a String using the soundex algorithm. - * - * @param pString - * A String object to encode - * @return A Soundex code corresponding to the String supplied - * @throws IllegalArgumentException - * if a character is not mapped - */ - public String encode(String pString) { - return soundex(pString); - } - - /** - * Used internally by the SoundEx algorithm. - * - * Consonants from the same code group separated by W or H are treated as one. - * - * @param str - * the cleaned working string to encode (in upper case). - * @param index - * the character position to encode - * @return Mapping code for a particular character - * @throws IllegalArgumentException - * if the character is not mapped - */ - private char getMappingCode(String str, int index) { - char mappedChar = this.map(str.charAt(index)); - // HW rule check - if (index > 1 && mappedChar != '0') { - char hwChar = str.charAt(index - 1); - if ('H' == hwChar || 'W' == hwChar) { - char preHWChar = str.charAt(index - 2); - char firstCode = this.map(preHWChar); - if (firstCode == mappedChar || 'H' == preHWChar || 'W' == preHWChar) { - return 0; - } - } - } - return mappedChar; - } - - /** - * Returns the maxLength. Standard Soundex - * - * @deprecated This feature is not needed since the encoding size must be constant. Will be removed in 2.0. - * @return int - */ - public int getMaxLength() { - return this.maxLength; - } - - /** - * Returns the soundex mapping. - * - * @return soundexMapping. - */ - private char[] getSoundexMapping() { - return this.soundexMapping; - } - - /** - * Maps the given upper-case character to it's Soudex code. - * - * @param ch - * An upper-case character. - * @return A Soundex code. - * @throws IllegalArgumentException - * Thrown if <code>ch</code> is not mapped. - */ - private char map(char ch) { - int index = ch - 'A'; - if (index < 0 || index >= this.getSoundexMapping().length) { - throw new IllegalArgumentException("The character is not mapped: " + ch); - } - return this.getSoundexMapping()[index]; - } - - /** - * Sets the maxLength. - * - * @deprecated This feature is not needed since the encoding size must be constant. Will be removed in 2.0. - * @param maxLength - * The maxLength to set - */ - public void setMaxLength(int maxLength) { - this.maxLength = maxLength; - } - - /** - * Sets the soundexMapping. - * - * @param soundexMapping - * The soundexMapping to set. - */ - private void setSoundexMapping(char[] soundexMapping) { - this.soundexMapping = soundexMapping; - } - - /** - * Retreives the Soundex code for a given String object. - * - * @param str - * String to encode using the Soundex algorithm - * @return A soundex code for the String supplied - * @throws IllegalArgumentException - * if a character is not mapped - */ - public String soundex(String str) { - if (str == null) { - return null; - } - str = SoundexUtils.clean(str); - if (str.length() == 0) { - return str; - } - char out[] = {'0', '0', '0', '0'}; - char last, mapped; - int incount = 1, count = 1; - out[0] = str.charAt(0); - last = getMappingCode(str, 0); - while ((incount < str.length()) && (count < out.length)) { - mapped = getMappingCode(str, incount++); - if (mapped != 0) { - if ((mapped != '0') && (mapped != last)) { - out[count++] = mapped; - } - last = mapped; - } - } - return new String(out); - } - -} |