/*

 * Copyright 2003-2006 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code 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.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code 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 in the LICENSE file that

 * accompanied this code).

 *

 * 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 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package java.lang;

/** The CharacterData class encapsulates the large tables found in

    Java.lang.Character. */

class CharacterData02 extends CharacterData {

    /* The character properties are currently encoded into 32 bits in the following manner:

        1 bit   mirrored property

        4 bits  directionality property

        9 bits  signed offset used for converting case

        1 bit   if 1, adding the signed offset converts the character to lowercase

        1 bit   if 1, subtracting the signed offset converts the character to uppercase

        1 bit   if 1, this character has a titlecase equivalent (possibly itself)

        3 bits  0  may not be part of an identifier

                1  ignorable control; may continue a Unicode identifier or Java identifier

                2  may continue a Java identifier but not a Unicode identifier (unused)

                3  may continue a Unicode identifier or Java identifier

                4  is a Java whitespace character

                5  may start or continue a Java identifier;

                   may continue but not start a Unicode identifier (underscores)

                6  may start or continue a Java identifier but not a Unicode identifier ($)

                7  may start or continue a Unicode identifier or Java identifier

                Thus:

                   5, 6, 7 may start a Java identifier

                   1, 2, 3, 5, 6, 7 may continue a Java identifier

                   7 may start a Unicode identifier

                   1, 3, 5, 7 may continue a Unicode identifier

                   1 is ignorable within an identifier

                   4 is Java whitespace

        2 bits  0  this character has no numeric property

                1  adding the digit offset to the character code and then

                   masking with 0x1F will produce the desired numeric value

                2  this character has a "strange" numeric value

                3  a Java supradecimal digit: adding the digit offset to the

                   character code, then masking with 0x1F, then adding 10

                   will produce the desired numeric value

        5 bits  digit offset

        5 bits  character type

        The encoding of character properties is subject to change at any time.

     */

    int getProperties(int ch) {

		char offset = (char)ch;

        int props = $$Lookup(offset);

        return props;

    }

    int getType(int ch) {

        int props = getProperties(ch);

        return (props & $$maskType);

    }

    boolean isJavaIdentifierStart(int ch) {

        int props = getProperties(ch);

        return ((props & $$maskIdentifierInfo) >= $$lowJavaStart);

    }

    boolean isJavaIdentifierPart(int ch) {

        int props = getProperties(ch);

        return ((props & $$nonzeroJavaPart) != 0);

    }

    boolean isUnicodeIdentifierStart(int ch) {

        int props = getProperties(ch);

        return ((props & $$maskIdentifierInfo) == $$valueUnicodeStart);

    }

    boolean isUnicodeIdentifierPart(int ch) {

        int props = getProperties(ch);

        return ((props & $$maskUnicodePart) != 0);

    }

    boolean isIdentifierIgnorable(int ch) {

        int props = getProperties(ch);

        return ((props & $$maskIdentifierInfo) == $$valueIgnorable);

    }

    int toLowerCase(int ch) {

        int mapChar = ch;

        int val = getProperties(ch);

        if ((val & $$maskLowerCase) != 0) {

            int offset = val << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);

            mapChar = ch + offset;

        }

        return mapChar;

    }

    int toUpperCase(int ch) {

        int mapChar = ch;

        int val = getProperties(ch);

        if ((val & $$maskUpperCase) != 0) {

            int offset = val  << $$shiftCaseOffsetSign >> ($$shiftCaseOffsetSign+$$shiftCaseOffset);

            mapChar =  ch - offset;

        }

        return mapChar;

    }

    int toTitleCase(int ch) {

        int mapChar = ch;

        int val = getProperties(ch);

        if ((val & $$maskTitleCase) != 0) {

            // There is a titlecase equivalent.  Perform further checks:

            if ((val & $$maskUpperCase) == 0) {

                // The character does not have an uppercase equivalent, so it must

                // already be uppercase; so add 1 to get the titlecase form.

                mapChar = ch + 1;

            }

            else if ((val & $$maskLowerCase) == 0) {

                // The character does not have a lowercase equivalent, so it must

                // already be lowercase; so subtract 1 to get the titlecase form.

                mapChar = ch - 1;

            }

            // else {

            // The character has both an uppercase equivalent and a lowercase

            // equivalent, so it must itself be a titlecase form; return it.

            // return ch;

            //}

        }

        else if ((val & $$maskUpperCase) != 0) {

            // This character has no titlecase equivalent but it does have an

            // uppercase equivalent, so use that (subtract the signed case offset).

            mapChar = toUpperCase(ch);

        }

        return mapChar;

    }

    int digit(int ch, int radix) {

        int value = -1;

        if (radix >= Character.MIN_RADIX && radix <= Character.MAX_RADIX) {

            int val = getProperties(ch);

            int kind = val & $$maskType;

            if (kind == Character.DECIMAL_DIGIT_NUMBER) {

                value = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit;

            }

            else if ((val & $$maskNumericType) == $$valueJavaSupradecimal) {

                // Java supradecimal digit

                value = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10;

            }

        }

        return (value < radix) ? value : -1;

    }

    int getNumericValue(int ch) {

        int val = getProperties(ch);

        int retval = -1;

        switch (val & $$maskNumericType) {

        default: // cannot occur

        case ($$valueNotNumeric):         // not numeric

            retval = -1;

            break;

        case ($$valueDigit):              // simple numeric

            retval = ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit;

            break;

        case ($$valueStrangeNumeric)      :       // "strange" numeric

            retval = -2;

            break;

        case ($$valueJavaSupradecimal):           // Java supradecimal

            retval = (ch + ((val & $$maskDigitOffset) >> $$shiftDigitOffset) & $$maskDigit) + 10;

            break;

        }

        return retval;

    }

    boolean isWhitespace(int ch) {

        return (getProperties(ch) & $$maskIdentifierInfo) == $$valueJavaWhitespace;

    }

    byte getDirectionality(int ch) {

        int val = getProperties(ch);

        byte directionality = (byte)((val & $$maskBidi) >> $$shiftBidi);

        if (directionality == 0xF ) {

	        directionality = Character.DIRECTIONALITY_UNDEFINED;

        }

        return directionality;

    }

    boolean isMirrored(int ch) {

        return (getProperties(ch) & $$maskMirrored) != 0;

    }

    static final CharacterData instance = new CharacterData02();

    private CharacterData02() {};

    $$Tables

    static {

        $$Initializers

    }        

}