http://commons.apache.org/proper/commons-codec/: The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities. (The Apache Software Foundation)
  • Christopher O'Brien
  • Martin Redington
  • Jeffery Dever
  • Steve Zimmermann
  • Benjamin Walstrum
  • Oleg Kalnichevski
  • Dave Dribin
  • Alex Karasulu
  • Matthew Inger
  • Jochen Wiedmann
  • Sebastian Bazley
  • Matthew Pocock
  • Colm Rice 
/*
 * 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
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package org.apache.commons.codec.binary;


 Operations on CharSequence that are null safe.




Copied from Apache Commons Lang r1586295 on April 10, 2014 (day of 3.3.2 release).



See Also:
Since:1.10
/**
 * <p>
 * Operations on {@link CharSequence} that are <code>null</code> safe.
 * </p>
 * <p>
 * Copied from Apache Commons Lang r1586295 on April 10, 2014 (day of 3.3.2 release).
 * </p>
 *
 * @see CharSequence
 * @since 1.10
 */
public class CharSequenceUtils {

    
Green implementation of regionMatches.

Params:
  • cs – 
           the CharSequence to be processed
  • ignoreCase – 
           whether or not to be case insensitive
  • thisStart – 
           the index to start on the cs CharSequence
  • substring – 
           the CharSequence to be looked for
  • start – 
           the index to start on the substring CharSequence
  • length – 
           character length of the region
Returns:whether the region matched
/**
     * Green implementation of regionMatches.
     *
     * @param cs
     *            the <code>CharSequence</code> to be processed
     * @param ignoreCase
     *            whether or not to be case insensitive
     * @param thisStart
     *            the index to start on the <code>cs</code> CharSequence
     * @param substring
     *            the <code>CharSequence</code> to be looked for
     * @param start
     *            the index to start on the <code>substring</code> CharSequence
     * @param length
     *            character length of the region
     * @return whether the region matched
     */
    static boolean regionMatches(final CharSequence cs, final boolean ignoreCase, final int thisStart,
            final CharSequence substring, final int start, final int length) {
        if (cs instanceof String && substring instanceof String) {
            return ((String) cs).regionMatches(ignoreCase, thisStart, (String) substring, start, length);
        }
        int index1 = thisStart;
        int index2 = start;
        int tmpLen = length;

        while (tmpLen-- > 0) {
            final char c1 = cs.charAt(index1++);
            final char c2 = substring.charAt(index2++);

            if (c1 == c2) {
                continue;
            }

            if (!ignoreCase) {
                return false;
            }

            // The same check as in String.regionMatches():
            if (Character.toUpperCase(c1) != Character.toUpperCase(c2) &&
                    Character.toLowerCase(c1) != Character.toLowerCase(c2)) {
                return false;
            }
        }

        return true;
    }
}