/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package com.sun.cldc.i18n.uclc;
import java.io.*;
import com.sun.cldc.i18n.*;
/**
* Default class converting the case of characters.
*
* @version 1.0 04/04/2000
*/
public class DefaultCaseConverter {
/**
* Determines if the specified character is a lowercase character.
* This is currently only supported for ISO-LATIN-1 characters: "a" through "z".
*
* @param ch the character to be tested.
* @return <code>true</code> if the character is lowercase;
* <code>false</code> otherwise.
* @since JDK1.0
*/
public static boolean isLowerCase(char ch) {
return ch >= 'a' && ch <= 'z';
}
/**
* Determines if the specified character is an uppercase character.
* This is currently only supported for ISO-LATIN-1 characters: "A" through "Z".
*
* @param ch the character to be tested.
* @return <code>true</code> if the character is uppercase;
* <code>false</code> otherwise.
* @see java.lang.Character#isLowerCase(char)
* @see java.lang.Character#toUpperCase(char)
* @since 1.0
*/
public static boolean isUpperCase(char ch) {
return ch >= 'A' && ch <= 'Z';
}
/**
* The given character is mapped to its lowercase equivalent; if the
* character has no lowercase equivalent, the character itself is
* returned.
* This is currently only supported for ISO-LATIN-1 characters.
*
* @param ch the character to be converted.
* @return the lowercase equivalent of the character, if any;
* otherwise the character itself.
* @see java.lang.Character#isLowerCase(char)
* @see java.lang.Character#isUpperCase(char)
* @see java.lang.Character#toUpperCase(char)
* @since JDK1.0
*/
public static char toLowerCase(char ch) {
if (isUpperCase(ch))
return (char)(ch + ('a' - 'A'));
else
return ch;
}
/**
* Converts the character argument to uppercase; if the
* character has no lowercase equivalent, the character itself is
* returned.
* This is currently only supported for ISO-LATIN-1 characters.
*
* @param ch the character to be converted.
* @return the uppercase equivalent of the character, if any;
* otherwise the character itself.
* @see java.lang.Character#isLowerCase(char)
* @see java.lang.Character#isUpperCase(char)
* @see java.lang.Character#toLowerCase(char)
* @since JDK1.0
*/
public static char toUpperCase(char ch) {
if (isLowerCase(ch))
return (char)(ch - ('a' - 'A'));
else
return ch;
}
/**
* Determines if the specified character is a digit.
* This is currently only supported for ISO-LATIN-1 digits: "0" through "9".
*
* @param ch the character to be tested.
* @return <code>true</code> if the character is a digit;
* <code>false</code> otherwise.
* @since JDK1.0
*/
public static boolean isDigit(char ch) {
return ch >= '0' && ch <= '9';
}
/**
* Returns the numeric value of the character <code>ch</code> in the
* specified radix.
* This is only supported for ISO-LATIN-1 characters.
*
* @param ch the character to be converted.
* @param radix the radix.
* @return the numeric value represented by the character in the
* specified radix.
* @see java.lang.Character#isDigit(char)
* @since JDK1.0
*/
public static int digit(char ch, int radix) {
int value = -1;
if (radix >= Character.MIN_RADIX && radix <= Character.MAX_RADIX) {
if (isDigit(ch)) {
value = ch - '0';
}
else if (isUpperCase(ch) || isLowerCase(ch)) {
// Java supradecimal digit
value = (ch & 0x1F) + 9;
}
}
return (value < radix) ? value : -1;
}
}
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