/*

 * Copyright (c) 2003, 2013, Oracle and/or its affiliates. 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.  Oracle designates this

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

 * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 * questions.

 */

package build.tools.generatebreakiteratordata;

import java.util.Arrays;

final class SupplementaryCharacterData {

    /**

     * Default value

     */

    private static final byte DEFAULT_VALUE = 0;

    private byte defaultValue;

    /**

     * A array which has a unicode code point(0x010000-0x10FFFF) as the upper

     * 3 bytes and a value as the remaining one byte in each data.

     */

    private int[] dataTable;

    /*

     * Counter to keep the number of data in tempTable

     */

    private int dataCount;

    /*

     * Temporary data table used until dataTable is generated.

     */

    private long[] tempTable;

    /*

     * Initila tempTable size

     */

    private static final int INITIAL_TABLE_SIZE = 150;

    /*

     * The number of entries to be appended when tempTable becomes full

     */

    private static final int ADDITIONAL_TABLE_SIZE = 10;

    /*

     * Upper limit, used as a sentinel

     */

    private static final int UPPER_LIMIT = Character.MAX_CODE_POINT + 1;

    /*

     * Mask for supplementary code points(0x010000-0x10FFFF)

     */

    private static final int CODEPOINT_MASK = 0x1FFFFF;

    public SupplementaryCharacterData(byte value) {

        defaultValue = value;

        dataCount = 0;

    }

    /**

     * Appends the given data to tempTable

     */

    public void appendElement(int start, int end, byte value) {

        if (tempTable == null) {

            tempTable = new long[INITIAL_TABLE_SIZE];

        }

        if (dataCount == tempTable.length) {

            long[] tempTempTable = new long[dataCount + ADDITIONAL_TABLE_SIZE];

            System.arraycopy(tempTable, 0, tempTempTable, 0, dataCount);

            tempTable = tempTempTable;

        }

        tempTable[dataCount++] = ((((long)start<<24) + end)<<8) + value;

    }

    /**

     * Returns the data table

     */

    public int[] getArray() {

        return dataTable;

    }

    /**

     * Creates dataTable

     */

    public void complete() {

        dataTable = generateTable();

    }

    /**

     * Generates a table from the given data

     */

    private int[] generateTable() {

        /* If tempTable is empty, put two data */

        if (dataCount == 0) {

            int[] tmpArray = new int[2];

            tmpArray[0] = composeEntry(0, DEFAULT_VALUE);

            tmpArray[1] = composeEntry(UPPER_LIMIT, DEFAULT_VALUE);

            tempTable = null;

            return tmpArray;

        }

        Arrays.sort(tempTable, 0, dataCount);

        int[] newTempTable = new int[dataCount*2 + 3];

        int old_index = 0;

        int new_index = 0;

        int loop_count = dataCount - 1;

        long data = tempTable[old_index];

        int start = (int)(data>>32) & CODEPOINT_MASK;

        int end   = (int)(data>>8) & CODEPOINT_MASK;

        /*

         * Add an entry if the first start code point in tempTable is not

         * the minimum supplementary code point.

         */

        if (start != Character.MIN_SUPPLEMENTARY_CODE_POINT) {

            newTempTable[new_index++] = composeEntry(Character.MIN_SUPPLEMENTARY_CODE_POINT, defaultValue);

        }

        newTempTable[new_index++] = composeEntry(start, (int)data);

        for (int i = 0; i < loop_count; i++) {

            data = tempTable[++old_index];

            int nextStart = (int)(data>>32) & CODEPOINT_MASK;

            /*

             * If the previous end code point is not equal to the previous start

             * code point and is not consecutive with the next start code point,

             * insert a filler entry before an entry for the next start code

             * point.

             */

            if (end != start && end != nextStart-1) {

                newTempTable[new_index++] = composeEntry(end + 1, defaultValue);

            }

            newTempTable[new_index++] = composeEntry(nextStart, (int)data);

            start = nextStart;

            end = (int)(data>>8) & CODEPOINT_MASK;

        }

        newTempTable[new_index++] = composeEntry(++end, defaultValue);

        /* Add an entry for a sentinel if necessary. */

        if (end < UPPER_LIMIT) {

            newTempTable[new_index++] = composeEntry(UPPER_LIMIT, defaultValue);

        }

        /* Copy data to dataTable. */

        dataTable = new int[new_index];

        System.arraycopy(newTempTable, 0, dataTable, 0, new_index);

        tempTable = null;

        return dataTable;

    }

    /**

     * Composes an entry with the given supplementary code point

     * (0x010000-0x10FFFF) for the upper 3 bytes and the given value for the

     * remaining one byte.

     */

    private int composeEntry(int codePoint, int value) {

        return (codePoint<<8) | (value&0xFF);

    }

}