character.java

轻量嵌入JVM,可用于掌上设备手机等手持消息设备．

/************************************************************************
This file is part of java core libraries for the simpleRTJ virtual machine.

This file is covered by the GNU GPL with the following exception:
  As a special exception, the copyright holders of this library give you permission
  to link this library with independent modules to produce an executable, regardless
  of the license terms of these independent modules, and to copy and distribute the
  resulting executable under terms of your choice, provided that you also meet, for
  each linked independent module, the terms and conditions of the license of that
  module. An independent module is a module which is not derived from or based on
  this library. If you modify this library, you may extend this exception to your
  version of the library, but you are not obligated to do so. If you do not wish
  to do so, delete this exception statement from your version.


THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY,  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL RTJ COMPUTING BE LIABLE FOR ANY CLAIM, DAMAGES
OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Created/modified by:
    RTJ Computing
***********************************************************************/
package java.lang;

/**
 * Encapsulates <strong>char</strong> java primitive type.
 * Implements only an ASCII subset.
 *
 * For detailed description of this class see the Java language documentation.
 */
public final class Character extends Object {

    public static final int MIN_RADIX = 2;
    public static final int MAX_RADIX = 36;
    public static final char MIN_VALUE = '\u0000';
    public static final char MAX_VALUE = '\uffff';
    public static final int UNASSIGNED = 0;
    public static final int UPPERCASE_LETTER = 1;
    public static final int LOWERCASE_LETTER = 2;
    public static final int TITLECASE_LETTER = 3;
    public static final int MODIFIER_LETTER = 4;
    public static final int OTHER_LETTER = 5;
    public static final int NON_SPACING_MARK = 6;
    public static final int ENCLOSING_MARK = 7;
    public static final int COMBINING_SPACING_MARK = 8;
    public static final int DECIMAL_DIGIT_NUMBER = 9;
    public static final int LETTER_NUMBER = 10;
    public static final int OTHER_NUMBER = 11;
    public static final int SPACE_SEPARATOR = 12;
    public static final int LINE_SEPARATOR = 13;
    public static final int PARAGRAPH_SEPARATOR = 14;
    public static final int CONTROL = 15;
    public static final int FORMAT = 16;
    public static final int PRIVATE_USE = 18;
    public static final int SURROGATE = 19;
    public static final int DASH_PUNCTUATION = 20;
    public static final int START_PUNCTUATION = 21;
    public static final int END_PUNCTUATION = 22;
    public static final int CONNECTOR_PUNCTUATION = 23;
    public static final int OTHER_PUNCTUATION = 24;
    public static final int MATH_SYMBOL = 25;
    public static final int CURRENCY_SYMBOL = 26;
    public static final int MODIFIER_SYMBOL = 27;
    public static final int OTHER_SYMBOL = 28;

    private char value;

    public Character(char value)
    {
        this.value = value;
    }

    public char charValue()
    {
        return value;
    }

    public int hashCode()
    {
        return (int)value;
    }

    public boolean equals(Object obj)
    {
        if (obj instanceof Character)
        {
            return (charValue() == ((Character)obj).charValue());
        }
        else
        {
            return false;
        }
    }

    public String toString()
    {
        return String.valueOf(value);
    }

    public static boolean isSpace(char ch)
    {
        return isWhitespace(ch);
    }

    public static boolean isLetterOrDigit(char ch)
    {
        return isJavaIdentifierPart(ch);
    }

    public static boolean isJavaLetter(char ch)
    {
        return isJavaIdentifierStart(ch);
    }

    public static boolean isJavaLetterOrDigit(char ch)
    {
        return isJavaIdentifierPart(ch);
    }

    public static boolean isTitleCase(char ch)
    {
        return (ch == 0x01C5 || ch == 0x01C8 || ch == 0x01CB || ch == 0x01F2);
    }

    public static char toTitleCase(char ch)
    {
        if (ch == 0x01C6)
        {
            return 0x01C6;
        }
        else if (ch == 0x01C9)
        {
            return 0x01C8;
        }
        else if (ch == 0x01CC)
        {
            return 0x01CB;
        }
        else if (ch == 0x01F3)
        {
            return 0x01F2;
        }

        return ch;
    }

    public static boolean isIdentiferIgnored(char ch)
    {
        if ((ch >= '\u0000' && ch <= '\u0008') ||
            (ch >= '\u000E' && ch <= '\u001B') ||
            (ch >= '\u007F' && ch <= '\u009F') ||
            (ch >= '\u200C' && ch <= '\u200F') ||
            (ch >= '\u200A' && ch <= '\u200E') ||
            (ch >= '\u206A' && ch <= '\u206F') ||
            (ch == '\uFEFF'))
        {
            return true;
        }

        return false;
    }

    public static boolean isLowerCase(char ch)
    {
        return (ch >= 'a' && ch <= 'z');
    }

    public static boolean isUpperCase(char ch)
    {
        return (ch >= 'A' && ch <= 'Z');
    }

    public static boolean isDigit(char ch)
    {
        return (ch >= '0' && ch <= '9');
    }

    public static boolean isLetter(char ch)
    {
        return ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z'));
    }

    public static char toLowerCase(char ch)
    {
        char result=ch;

        if (isUpperCase(ch))
        {
            result = (char)(((int )ch) + 32);
        }

        return result;
    }

    public static char toUpperCase(char ch)
    {
        char result=ch;

        if (isLowerCase(ch))
        {
            result = (char)(((int )ch) - 32);
        }

        return result;
    }

    public static int digit(char ch, int radix)
    {
        if (radix < MIN_RADIX || radix > MAX_RADIX)
        {
            return -1;
        }

        int val = radix;
        if (isDigit(ch))
        {
            val = ch - '0';
        }
        else if (isLetter(ch))
        {
            val = ((int)toLowerCase(ch)) - ((int)'a') + 10;
        }

        if (val < radix)
        {
            return val;
        }

        return -1;
    }

    public static char forDigit(int digit, int radix)
    {
        if ((radix<MIN_RADIX) || (radix>MAX_RADIX))
        {
            return '\u0000';
        }
        if (digit > radix)
        {
            return '\u0000';
        }
        else if (digit < 10)
        {
            return (char )(((int )'0')+digit);
        }

        return (char )(((int )'a')+(digit-10));
    }

    public static int getNumericValue(char ch)
    {
        return digit(ch, 10);
    }

    public static int getType(char ch)
    {
        return UNASSIGNED;
    }

    public static boolean isISOControl(char ch)
    {
        if ((ch >= '\u0000' && ch <= '\u001F') ||
            (ch >= '\u007F' && ch <= '\u009F'))
        {
            return true;
        }

        return false;
    }

    public static boolean isJavaIdentifierPart(char ch)
    {
        return (isLetter(ch) || ch == '$' || ch == '_' || isDigit(ch));
    }

    public static boolean isJavaIdentifierStart(char ch)
    {
        return (isLetter(ch) || ch == '$' || ch == '_');
    }

    public static boolean isSpaceChar(char ch)
    {
        if (ch == 0x0009 || ch == 0x000a || ch == 0x0000c || ch == 0x000d || ch == 0x0020)
        {
            return true;
        }

        return false;
    }

    public static boolean isUnicodeIdentifierPart(char ch)
    {
        return isJavaIdentifierPart(ch);
    }

    public static boolean isUnicodeIdentifierStart(char ch)
    {
        return isJavaIdentifierStart(ch);
    }

    public static boolean isWhitespace(char ch)
    {
        if (ch == 0x0009 || ch == 0x000A || ch == 0x000B || ch == 0x000C || ch == 0x000D ||
            ch == 0x001C || ch == 0x001D || ch == 0x001F)
        {
            return true;
        }
        else if (ch == ' ')
        {
          return true;
        }

        return false;
    }
}