Coverage Report

Coverage Report - org.apache.commons.codec.language.Soundex

Classes in this File

Line Coverage

Branch Coverage

Complexity

Soundex

94%

48/51

94%

32/34

2.833

 /*
  * 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 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.
  *
  * This class is thread-safe.
  * Although not strictly immutable, the {@link #maxLength} field is not actually used.
  *
  * @version $Id$
  */
 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();
 
     /**
      * 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.
      */
     @Deprecated
     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(final 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(final String mapping) {
         this.soundexMapping = mapping.toCharArray();
     }
 
     /**
      * 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(final String s1, final String s2) throws EncoderException {
         return SoundexUtils.difference(this, s1, s2);
     }
 
     /**
      * 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 obj
      *                  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
      */
     @Override
     public Object encode(final Object obj) throws EncoderException {
         if (!(obj instanceof String)) {
             throw new EncoderException("Parameter supplied to Soundex encode is not of type java.lang.String");
         }
         return soundex((String) obj);
     }
 
     /**
      * Encodes a String using the soundex algorithm.
      *
      * @param str
      *                  A String object to encode
      * @return A Soundex code corresponding to the String supplied
      * @throws IllegalArgumentException
      *                  if a character is not mapped
      */
     @Override
     public String encode(final String str) {
         return soundex(str);
     }
 
     /**
      * 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(final String str, final int index) {
         // map() throws IllegalArgumentException
         final char mappedChar = this.map(str.charAt(index));
         // HW rule check
         if (index > 1 && mappedChar != '0') {
             final char hwChar = str.charAt(index - 1);
             if ('H' == hwChar || 'W' == hwChar) {
                 final char preHWChar = str.charAt(index - 2);
                 final 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
      */
     @Deprecated
     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(final char ch) {
         final 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
      */
     @Deprecated
     public void setMaxLength(final 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;
         }
         final 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);
     }
 
 }

1		/*
2		* Licensed to the Apache Software Foundation (ASF) under one or more
3		* contributor license agreements. See the NOTICE file distributed with
4		* this work for additional information regarding copyright ownership.
5		* The ASF licenses this file to You under the Apache License, Version 2.0
6		* (the "License"); you may not use this file except in compliance with
7		* the License. You may obtain a copy of the License at
8		*
9		* http://www.apache.org/licenses/LICENSE-2.0
10		*
11		* Unless required by applicable law or agreed to in writing, software
12		* distributed under the License is distributed on an "AS IS" BASIS,
13		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14		* See the License for the specific language governing permissions and
15		* limitations under the License.
16		*/
17
18		package org.apache.commons.codec.language;
19
20		import org.apache.commons.codec.EncoderException;
21		import org.apache.commons.codec.StringEncoder;
22
23		/**
24		* Encodes a string into a Soundex value. Soundex is an encoding used to relate similar names, but can also be used as a
25		* general purpose scheme to find word with similar phonemes.
26		*
27		* This class is thread-safe.
28		* Although not strictly immutable, the {@link #maxLength} field is not actually used.
29		*
30		* @version $Id$
31		*/
32		public class Soundex implements StringEncoder {
33
34		/**
35		* This is a default mapping of the 26 letters used in US English. A value of <code>0</code> for a letter position
36		* means do not encode.
37		* <p>
38		* (This constant is provided as both an implementation convenience and to allow Javadoc to pick
39		* up the value for the constant values page.)
40		* </p>
41		*
42		* @see #US_ENGLISH_MAPPING
43		*/
44		public static final String US_ENGLISH_MAPPING_STRING = "01230120022455012623010202";
45
46		/**
47		* This is a default mapping of the 26 letters used in US English. A value of <code>0</code> for a letter position
48		* means do not encode.
49		*
50		* @see Soundex#Soundex(char[])
51		*/
52	1	private static final char[] US_ENGLISH_MAPPING = US_ENGLISH_MAPPING_STRING.toCharArray();
53
54		/**
55		* An instance of Soundex using the US_ENGLISH_MAPPING mapping.
56		*
57		* @see #US_ENGLISH_MAPPING
58		*/
59	1	public static final Soundex US_ENGLISH = new Soundex();
60
61		/**
62		* The maximum length of a Soundex code - Soundex codes are only four characters by definition.
63		*
64		* @deprecated This feature is not needed since the encoding size must be constant. Will be removed in 2.0.
65		*/
66	33	@Deprecated
67		private int maxLength = 4;
68
69		/**
70		* Every letter of the alphabet is "mapped" to a numerical value. This char array holds the values to which each
71		* letter is mapped. This implementation contains a default map for US_ENGLISH
72		*/
73		private final char[] soundexMapping;
74
75		/**
76		* Creates an instance using US_ENGLISH_MAPPING
77		*
78		* @see Soundex#Soundex(char[])
79		* @see Soundex#US_ENGLISH_MAPPING
80		*/
81	31	public Soundex() {
82	31	this.soundexMapping = US_ENGLISH_MAPPING;
83	31	}
84
85		/**
86		* Creates a soundex instance using the given mapping. This constructor can be used to provide an internationalized
87		* mapping for a non-Western character set.
88		*
89		* Every letter of the alphabet is "mapped" to a numerical value. This char array holds the values to which each
90		* letter is mapped. This implementation contains a default map for US_ENGLISH
91		*
92		* @param mapping
93		* Mapping array to use when finding the corresponding code for a given character
94		*/
95	1	public Soundex(final char[] mapping) {
96	1	this.soundexMapping = new char[mapping.length];
97	1	System.arraycopy(mapping, 0, this.soundexMapping, 0, mapping.length);
98	1	}
99
100		/**
101		* Creates a refined soundex instance using a custom mapping. This constructor can be used to customize the mapping,
102		* and/or possibly provide an internationalized mapping for a non-Western character set.
103		*
104		* @param mapping
105		* Mapping string to use when finding the corresponding code for a given character
106		* @since 1.4
107		*/
108	1	public Soundex(final String mapping) {
109	1	this.soundexMapping = mapping.toCharArray();
110	1	}
111
112		/**
113		* Encodes the Strings and returns the number of characters in the two encoded Strings that are the same. This
114		* return value ranges from 0 through 4: 0 indicates little or no similarity, and 4 indicates strong similarity or
115		* identical values.
116		*
117		* @param s1
118		* A String that will be encoded and compared.
119		* @param s2
120		* A String that will be encoded and compared.
121		* @return The number of characters in the two encoded Strings that are the same from 0 to 4.
122		*
123		* @see SoundexUtils#difference(StringEncoder,String,String)
124		* @see <a href="http://msdn.microsoft.com/library/default.asp?url=/library/en-us/tsqlref/ts_de-dz_8co5.asp"> MS
125		* T-SQL DIFFERENCE </a>
126		*
127		* @throws EncoderException
128		* if an error occurs encoding one of the strings
129		* @since 1.3
130		*/
131		public int difference(final String s1, final String s2) throws EncoderException {
132	12	return SoundexUtils.difference(this, s1, s2);
133		}
134
135		/**
136		* Encodes an Object using the soundex algorithm. This method is provided in order to satisfy the requirements of
137		* the Encoder interface, and will throw an EncoderException if the supplied object is not of type java.lang.String.
138		*
139		* @param obj
140		* Object to encode
141		* @return An object (or type java.lang.String) containing the soundex code which corresponds to the String
142		* supplied.
143		* @throws EncoderException
144		* if the parameter supplied is not of type java.lang.String
145		* @throws IllegalArgumentException
146		* if a character is not mapped
147		*/
148		@Override
149		public Object encode(final Object obj) throws EncoderException {
150	6	if (!(obj instanceof String)) {
151	1	throw new EncoderException("Parameter supplied to Soundex encode is not of type java.lang.String");
152		}
153	5	return soundex((String) obj);
154		}
155
156		/**
157		* Encodes a String using the soundex algorithm.
158		*
159		* @param str
160		* A String object to encode
161		* @return A Soundex code corresponding to the String supplied
162		* @throws IllegalArgumentException
163		* if a character is not mapped
164		*/
165		@Override
166		public String encode(final String str) {
167	175	return soundex(str);
168		}
169
170		/**
171		* Used internally by the SoundEx algorithm.
172		*
173		* Consonants from the same code group separated by W or H are treated as one.
174		*
175		* @param str
176		* the cleaned working string to encode (in upper case).
177		* @param index
178		* the character position to encode
179		* @return Mapping code for a particular character
180		* @throws IllegalArgumentException
181		* if the character is not mapped
182		*/
183		private char getMappingCode(final String str, final int index) {
184		// map() throws IllegalArgumentException
185	971	final char mappedChar = this.map(str.charAt(index));
186		// HW rule check
187	969	if (index > 1 && mappedChar != '0') {
188	367	final char hwChar = str.charAt(index - 1);
189	367	if ('H' == hwChar \|\| 'W' == hwChar) {
190	10	final char preHWChar = str.charAt(index - 2);
191	10	final char firstCode = this.map(preHWChar);
192	10	if (firstCode == mappedChar \|\| 'H' == preHWChar \|\| 'W' == preHWChar) {
193	4	return 0;
194		}
195		}
196		}
197	965	return mappedChar;
198		}
199
200		/**
201		* Returns the maxLength. Standard Soundex
202		*
203		* @deprecated This feature is not needed since the encoding size must be constant. Will be removed in 2.0.
204		* @return int
205		*/
206		@Deprecated
207		public int getMaxLength() {
208	0	return this.maxLength;
209		}
210
211		/**
212		* Returns the soundex mapping.
213		*
214		* @return soundexMapping.
215		*/
216		private char[] getSoundexMapping() {
217	1960	return this.soundexMapping;
218		}
219
220		/**
221		* Maps the given upper-case character to its Soundex code.
222		*
223		* @param ch
224		* An upper-case character.
225		* @return A Soundex code.
226		* @throws IllegalArgumentException
227		* Thrown if <code>ch</code> is not mapped.
228		*/
229		private char map(final char ch) {
230	981	final int index = ch - 'A';
231	981	if (index < 0 \|\| index >= this.getSoundexMapping().length) {
232	2	throw new IllegalArgumentException("The character is not mapped: " + ch);
233		}
234	979	return this.getSoundexMapping()[index];
235		}
236
237		/**
238		* Sets the maxLength.
239		*
240		* @deprecated This feature is not needed since the encoding size must be constant. Will be removed in 2.0.
241		* @param maxLength
242		* The maxLength to set
243		*/
244		@Deprecated
245		public void setMaxLength(final int maxLength) {
246	0	this.maxLength = maxLength;
247	0	}
248
249		/**
250		* Retrieves the Soundex code for a given String object.
251		*
252		* @param str
253		* String to encode using the Soundex algorithm
254		* @return A soundex code for the String supplied
255		* @throws IllegalArgumentException
256		* if a character is not mapped
257		*/
258		public String soundex(String str) {
259	184	if (str == null) {
260	3	return null;
261		}
262	181	str = SoundexUtils.clean(str);
263	181	if (str.length() == 0) {
264	7	return str;
265		}
266	174	final char out[] = {'0', '0', '0', '0'};
267		char last, mapped;
268	174	int incount = 1, count = 1;
269	174	out[0] = str.charAt(0);
270		// getMappingCode() throws IllegalArgumentException
271	174	last = getMappingCode(str, 0);
272	969	while (incount < str.length() && count < out.length) {
273	797	mapped = getMappingCode(str, incount++);
274	797	if (mapped != 0) {
275	793	if (mapped != '0' && mapped != last) {
276	383	out[count++] = mapped;
277		}
278	793	last = mapped;
279		}
280		}
281	172	return new String(out);
282		}
283
284		}