CustomAccentTable.java

/*
 * $Id: CustomAccentTable.java 536 2008-02-19 06:03:27Z weiju $
 * 
 * Created on 2005/01/15
 * Copyright 2005-2008 by Wei-ju Wu
 * This file is part of The Z-machine Preservation Project (ZMPP).
 *
 * ZMPP is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * ZMPP 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ZMPP.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.zmpp.encoding;

import org.zmpp.base.Memory;

/**
 * This accent table is used in case that there is an extension header that
 * specifies that accent table.
 *
 * @author Wei-ju Wu
 * @version 1.0
 */
public class CustomAccentTable implements AccentTable {

    /**
     * The Memory object.
     */
    private Memory memory;

    /**
     * The table adddress.
     */
    private int tableAddress;

    /**
     * Constructor.
     *
     * @param memory a Memory object
     * @param address the table address
     */
    public CustomAccentTable(final Memory memory, final int address) {
        this.memory = memory;
        this.tableAddress = address;
    }

    /**
     * {@inheritDoc}
     */
    public int getLength() {
        int result = 0;
        if (tableAddress > 0) {
            result = memory.readUnsignedByte(tableAddress);
        }
        return result;
    }

    /**
     * {@inheritDoc}
     */
    public short getAccent(final int index) {
        short result = '?';
        if (tableAddress > 0) {
            result = memory.readShort(tableAddress + (index * 2) + 1);
        }
        return result;
    }

    /**
     * {@inheritDoc}
     */
    public int getIndexOfLowerCase(final int index) {
        final char c = (char) getAccent(index);
        final char lower = Character.toLowerCase(c);
        final int length = getLength();

        for (int i = 0; i < length; i++) {
            if (getAccent(i) == lower) {
                return i;
            }
        }
        return index;
    }
}