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QuestDB is High Performance Time Series Database

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 * Copyright (C) 2014-2016 Appsicle
 *
 * This program is free software: you can redistribute it and/or  modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program 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 Affero General Public License for more details.
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package com.questdb.std.str;

import com.questdb.misc.Unsafe;
import com.questdb.std.Mutable;
import com.questdb.std.ObjectFactory;

public class DirectByteCharSequence extends AbstractCharSequence implements Mutable, ByteSequence {
    public static final Factory FACTORY = new Factory();
    private long lo;
    private long hi;

    public long address() {
        return lo;
    }

    @Override
    public byte byteAt(int index) {
        return Unsafe.getUnsafe().getByte(lo + index);
    }

    @Override
    public void clear() {
        this.lo = this.hi = 0;
    }

    public long getHi() {
        return hi;
    }

    public long getLo() {
        return lo;
    }

    @Override
    public int length() {
        return (int) (hi - lo);
    }

    @Override
    public char charAt(int index) {
        return (char) byteAt(index);
    }

    public void lshift(long delta) {
        this.lo -= delta;
        this.hi -= delta;
    }

    public DirectByteCharSequence of(long lo, long hi) {
        this.lo = lo;
        this.hi = hi;
        return this;
    }

    @Override
    public CharSequence subSequence(int start, int end) {
        DirectByteCharSequence seq = new DirectByteCharSequence();
        seq.lo = this.lo + start;
        seq.hi = this.lo + end;
        return seq;
    }

    public static final class Factory implements ObjectFactory {
        @Override
        public DirectByteCharSequence newInstance() {
            return new DirectByteCharSequence();
        }
    }
}