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QuestDB is High Performance Time Series Database

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 * Copyright (C) 2014-2016 Appsicle
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 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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package com.questdb.std.str;

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

public class FlyweightCharSequence extends AbstractCharSequence implements Mutable {
    public static final ObjectFactory FACTORY = new ObjectFactory() {
        @Override
        public FlyweightCharSequence newInstance() {
            return new FlyweightCharSequence();
        }
    };

    private CharSequence delegate;
    private int lo;
    private int len = -1;

    @Override
    public void clear() {

    }

    @Override
    public int length() {
        return len;
    }

    @Override
    public char charAt(int index) {
        return delegate.charAt(index + lo);
    }

    public FlyweightCharSequence of(CharSequence delegate) {
        return of(delegate, 0, delegate.length());
    }

    public FlyweightCharSequence of(CharSequence delegate, int lo, int len) {
        this.delegate = delegate;
        this.lo = lo;
        this.len = len;
        return this;
    }

    public FlyweightCharSequence ofQuoted(CharSequence delegate) {
        return of(delegate, 1, delegate.length() - 2);
    }
}