/*
 * Copyright 2007, 2008, 2009 Duncan McGregor
 *
 * This file is part of Rococoa, a library to allow Java to talk to Cocoa.
 *
 * Rococoa is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Rococoa 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Rococoa.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.rococoa.internal;

/**
 * Batches calls to operate(), calling operation() once per batchsize.
 * 
 * @author duncan
 */
public abstract class OperationBatcher {
    private final int batchSize;
    private int count;
    private boolean closed;

    public OperationBatcher(int batchSize) {
        this.batchSize = batchSize;
        reset();
    }

    public void operate() {
        if (closed) {
            throw new IllegalStateException("Batcher closed");
        }
        if (++count < batchSize) {
            return;
        }
        operation();
        reset();
        count = 0;
    }

    public void close() {
        if (closed) {
            throw new IllegalStateException("Batcher closed");
        }
        operation();
        closed = true;
    }

    protected abstract void operation();
    
    protected abstract void reset();
}
