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/*
 * 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;

/**
 * Utility methods for {@link Soundex} and {@link RefinedSoundex} classes.
 *
 * 

This class is immutable and thread-safe.

* * @version $Id$ * @since 1.3 */ final class SoundexUtils { /** * Cleans up the input string before Soundex processing by only returning * upper case letters. * * @param str * The String to clean. * @return A clean String. */ static String clean(final String str) { if (str == null || str.length() == 0) { return str; } final int len = str.length(); final char[] chars = new char[len]; int count = 0; for (int i = 0; i < len; i++) { if (Character.isLetter(str.charAt(i))) { chars[count++] = str.charAt(i); } } if (count == len) { return str.toUpperCase(java.util.Locale.ENGLISH); } return new String(chars, 0, count).toUpperCase(java.util.Locale.ENGLISH); } /** * Encodes the Strings and returns the number of characters in the two * encoded Strings that are the same. *
    *
  • For Soundex, this return value ranges from 0 through 4: 0 indicates * little or no similarity, and 4 indicates strong similarity or identical * values.
  • *
  • For refined Soundex, the return value can be greater than 4.
  • *
* * @param encoder * The encoder to use to encode the Strings. * @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 Soundex encoded Strings that * are the same. * * @see #differenceEncoded(String,String) * @see * MS T-SQL DIFFERENCE * * @throws EncoderException * if an error occurs encoding one of the strings */ static int difference(final StringEncoder encoder, final String s1, final String s2) throws EncoderException { return differenceEncoded(encoder.encode(s1), encoder.encode(s2)); } /** * Returns the number of characters in the two Soundex encoded Strings that * are the same. *
    *
  • For Soundex, this return value ranges from 0 through 4: 0 indicates * little or no similarity, and 4 indicates strong similarity or identical * values.
  • *
  • For refined Soundex, the return value can be greater than 4.
  • *
* * @param es1 * An encoded String. * @param es2 * An encoded String. * @return The number of characters in the two Soundex encoded Strings that * are the same. * * @see * MS T-SQL DIFFERENCE */ static int differenceEncoded(final String es1, final String es2) { if (es1 == null || es2 == null) { return 0; } final int lengthToMatch = Math.min(es1.length(), es2.length()); int diff = 0; for (int i = 0; i < lengthToMatch; i++) { if (es1.charAt(i) == es2.charAt(i)) { diff++; } } return diff; } }




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