/*
* Copyright © 2003 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
*/
package java.lang;
import com.sun.cldc.i18n.uclc.*;
/**
* The Character class wraps a value of the primitive type <code>char</code>
* in an object. An object of type <code>Character</code> contains a
* single field whose type is <code>char</code>.
* <p>
* In addition, this class provides several methods for determining
* the type of a character and converting characters from uppercase
* to lowercase and vice versa.
* <p>
* Character information is based on the Unicode Standard, version 3.0.
* However, in order to reduce footprint, by default the character
* property and case conversion operations in CLDC are available
* only for the ISO Latin-1 range of characters. Other Unicode
* character blocks can be supported as necessary.
* <p>
*
* @author Lee Boynton
* @author Guy Steele
* @author Akira Tanaka
* @version 12/17/01 (CLDC 1.1)
* @since JDK1.0, CLDC 1.0
*/
/*
* Implementation note:
*
* The character property and case conversion facilities
* provided by the CLDC reference implementation can be
* extended by overriding an implementation class called
* DefaultCaseConverter. Refer to the end of this file
* for details.
*/
public final class Character extends Object {
/**
* The minimum radix available for conversion to and from Strings.
*
* @see java.lang.Integer#toString(int, int)
* @see java.lang.Integer#valueOf(java.lang.String)
*/
public static final int MIN_RADIX = 2;
/**
* The maximum radix available for conversion to and from Strings.
*
* @see java.lang.Integer#toString(int, int)
* @see java.lang.Integer#valueOf(java.lang.String)
*/
public static final int MAX_RADIX = 36;
/**
* The constant value of this field is the smallest value of type
* <code>char</code>.
*
* @since JDK1.0.2
*/
public static final char MIN_VALUE = '\u0000';
/**
* The constant value of this field is the largest value of type
* <code>char</code>.
*
* @since JDK1.0.2
*/
public static final char MAX_VALUE = '\uffff';
/**
* The value of the Character.
*/
private char value;
/**
* Constructs a <code>Character</code> object and initializes it so
* that it represents the primitive <code>value</code> argument.
*
* @param value value for the new <code>Character</code> object.
*/
public Character(char value) {
this.value = value;
}
/**
* Returns the value of this Character object.
* @return the primitive <code>char</code> value represented by
* this object.
*/
public char charValue() {
return value;
}
/**
* Returns a hash code for this Character.
* @return a hash code value for this object.
*/
public int hashCode() {
return (int)value;
}
/**
* Compares this object against the specified object.
* The result is <code>true</code> if and only if the argument is not
* <code>null</code> and is a <code>Character</code> object that
* represents the same <code>char</code> value as this object.
*
* @param obj the object to compare with.
* @return <code>true</code> if the objects are the same;
* <code>false</code> otherwise.
*/
public boolean equals(Object obj) {
if (obj instanceof Character) {
return value == ((Character)obj).charValue();
}
return false;
}
/**
* Returns a String object representing this character's value.
* Converts this <code>Character</code> object to a string. The
* result is a string whose length is <code>1</code>. The string's
* sole component is the primitive <code>char</code> value represented
* by this object.
*
* @return a string representation of this object.
*/
public String toString() {
char buf[] = {value};
return String.valueOf(buf);
}
/**
* Determines if the specified character is a lowercase character.
* <p>
* Note that by default CLDC only supports
* the ISO Latin-1 range of characters.
* <p>
* Of the ISO Latin-1 characters (character codes 0x0000 through 0x00FF),
* the following are lowercase:
* <p>
* a b c d e f g h i j k l m n o p q r s t u v w x y z
* \u00DF \u00E0 \u00E1 \u00E2 \u00E3 \u00E4 \u00E5 \u00E6 \u00E7
* \u00E8 \u00E9 \u00EA \u00EB \u00EC \u00ED \u00EE \u00EF \u00F0
* \u00F1 \u00F2 \u00F3 \u00F4 \u00F5 \u00F6 \u00F8 \u00F9 \u00FA
* \u00FB \u00FC \u00FD \u00FE \u00FF
*
* @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 caseConverter().isLowerCase(ch);
}
/**
* Determines if the specified character is an uppercase character.
* <p>
* Note that by default CLDC only supports
* the ISO Latin-1 range of characters.
* <p>
* Of the ISO Latin-1 characters (character codes 0x0000 through 0x00FF),
* the following are uppercase:
* <p>
* A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
* \u00C0 \u00C1 \u00C2 \u00C3 \u00C4 \u00C5 \u00C6 \u00C7
* \u00C8 \u00C9 \u00CA \u00CB \u00CC \u00CD \u00CE \u00CF \u00D0
* \u00D1 \u00D2 \u00D3 \u00D4 \u00D5 \u00D6 \u00D8 \u00D9 \u00DA
* \u00DB \u00DC \u00DD \u00DE
*
* @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 caseConverter().isUpperCase(ch);
}
/**
* Determines if the specified character is a digit.
*
* @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 caseConverter().isDigit(ch);
}
/**
* The given character is mapped to its lowercase equivalent; if the
* character has no lowercase equivalent, the character itself is
* returned.
* <p>
* Note that by default CLDC only supports
* the ISO Latin-1 range of 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) {
return caseConverter().toLowerCase(ch);
}
/**
* Converts the character argument to uppercase; if the
* character has no uppercase equivalent, the character itself is
* returned.
* <p>
* Note that by default CLDC only supports
* the ISO Latin-1 range of 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) {
return caseConverter().toUpperCase(ch);
}
/**
* Returns the numeric value of the character <code>ch</code> in the
* specified radix.
*
* @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) {
return caseConverter().digit(ch, radix);
}
/*
* Implementation note:
*
* The code below allows the default case converter class
* to be overridden by defining a system property called
* "java.lang.Character.caseConverter".
*
* By default, the system only supports the ISO Latin-1
* range of characters for character properties and
* case conversion.
*/
static DefaultCaseConverter cc;
static DefaultCaseConverter caseConverter() {
if (cc != null) {
return cc;
}
String ccName = "?";
try {
/* Get the default encoding name */
ccName = System.getProperty("java.lang.Character.caseConverter");
if (ccName == null) {
ccName = "com.sun.cldc.i18n.uclc.DefaultCaseConverter";
}
/* Using the decoder names lookup a class to implement the reader */
Class clazz = Class.forName(ccName);
/* Return a new instance */
cc = (DefaultCaseConverter)clazz.newInstance();
} catch (Exception x) {
throw new RuntimeException("Cannot find case converter class "+ccName+" -> "+x.getMessage());
}
return cc;
}
}
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