/*
 * Copyright (C) 2019, HuntLabs
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */

module hunt.database.base.impl.StringLongSequence;

class StringLongSequence {

    private short count;

    long next() {
        short val = count++;
        long next = 0x30_30_30_00_00_00_00_00L;
        next |= toHex(val >> 12 & 0xF) << 32;
        next |= toHex(val >>  8 & 0xF) << 24;
        next |= toHex(val >>  4 & 0xF) << 16;
        next |= toHex(val >>  0 & 0xF) << 8;
        return next;
    }

    private static long toHex(int c) {
        if (c < 10) {
            return cast(byte)('0' + c);
        } else {
            return cast(byte)('A' + c - 10);
        }
    }

}