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Diffstat (limited to 'mobile/android/thirdparty/org/mozilla/apache/commons/codec/language/Soundex.java')
| -rw-r--r-- | mobile/android/thirdparty/org/mozilla/apache/commons/codec/language/Soundex.java | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/mobile/android/thirdparty/org/mozilla/apache/commons/codec/language/Soundex.java b/mobile/android/thirdparty/org/mozilla/apache/commons/codec/language/Soundex.java new file mode 100644 index 000000000..76805bca3 --- /dev/null +++ b/mobile/android/thirdparty/org/mozilla/apache/commons/codec/language/Soundex.java @@ -0,0 +1,279 @@ +// Mozilla has modified this file - see http://hg.mozilla.org/ for details. +/* + * 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.mozilla.apache.commons.codec.language; + +import org.mozilla.apache.commons.codec.EncoderException; +import org.mozilla.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 1064454 2011-01-28 04:40:02Z ggregory $ + */ +public class Soundex implements StringEncoder { + + /** + * 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[]) + */ + private static final char[] US_ENGLISH_MAPPING = US_ENGLISH_MAPPING_STRING.toCharArray(); + + /** + * An instance of Soundex using the US_ENGLISH_MAPPING mapping. + * + * @see #US_ENGLISH_MAPPING + */ + public static final Soundex US_ENGLISH = new Soundex(); + + + /** + * 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 SoundexUtils#difference(StringEncoder,String,String) + * @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 final char[] soundexMapping; + + /** + * Creates an instance using US_ENGLISH_MAPPING + * + * @see Soundex#Soundex(char[]) + * @see Soundex#US_ENGLISH_MAPPING + */ + public Soundex() { + this.soundexMapping = 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.soundexMapping = new char[mapping.length]; + System.arraycopy(mapping, 0, this.soundexMapping, 0, mapping.length); + } + + /** + * Creates a refined soundex instance using a custom mapping. This constructor can be used to customize the mapping, + * and/or possibly provide an internationalized mapping for a non-Western character set. + * + * @param mapping + * Mapping string to use when finding the corresponding code for a given character + * @since 1.4 + */ + public Soundex(String mapping) { + this.soundexMapping = mapping.toCharArray(); + } + + /** + * 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) { + // map() throws IllegalArgumentException + 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 its Soundex 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; + } + + /** + * Retrieves 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); + // getMappingCode() throws IllegalArgumentException + 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); + } + +} |