/*
* Copyright (C) 2009, Google Inc.
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* - Neither the name of the Git Development Community nor the
* names of its contributors may be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.spearce.jgit.util;
/** Miscellaneous string comparison utility methods. */
public final class StringUtils {
private static final char[] LC;
static {
LC = new char['Z' + 1];
for (char c = 0; c < LC.length; c++)
LC[c] = c;
for (char c = 'A'; c <= 'Z'; c++)
LC[c] = (char) ('a' + (c - 'A'));
}
/**
* Convert the input to lowercase.
* <p>
* This method does not honor the JVM locale, but instead always behaves as
* though it is in the US-ASCII locale. Only characters in the range 'A'
* through 'Z' are converted. All other characters are left as-is, even if
* they otherwise would have a lowercase character equivilant.
*
* @param c
* the input character.
* @return lowercase version of the input.
*/
public static char toLowerCase(final char c) {
return c <= 'Z' ? LC[c] : c;
}
/**
* Convert the input string to lower case, according to the "C" locale.
* <p>
* This method does not honor the JVM locale, but instead always behaves as
* though it is in the US-ASCII locale. Only characters in the range 'A'
* through 'Z' are converted, all other characters are left as-is, even if
* they otherwise would have a lowercase character equivilant.
*
* @param in
* the input string. Must not be null.
* @return a copy of the input string, after converting characters in the
* range 'A'..'Z' to 'a'..'z'.
*/
public static String toLowerCase(final String in) {
final StringBuilder r = new StringBuilder(in.length());
for (int i = 0; i < in.length(); i++)
r.append(toLowerCase(in.charAt(i)));
return r.toString();
}
/**
* Test if two strings are equal, ignoring case.
* <p>
* This method does not honor the JVM locale, but instead always behaves as
* though it is in the US-ASCII locale.
*
* @param a
* first string to compare.
* @param b
* second string to compare.
* @return true if a equals b
*/
public static boolean equalsIgnoreCase(final String a, final String b) {
if (a == b)
return true;
if (a.length() != b.length())
return false;
for (int i = 0; i < a.length(); i++) {
if (toLowerCase(a.charAt(i)) != toLowerCase(b.charAt(i)))
return false;
}
return true;
}
private StringUtils() {
// Do not create instances
}
}