ConstantGrowthStrategy.java

/* This file is part of the db4o object database http://www.db4o.com

Copyright (C) 2004 - 2011  Versant Corporation http://www.versant.com

db4o is free software; you can redistribute it and/or modify it under
the terms of version 3 of the GNU General Public License as published
by the Free Software Foundation.

db4o 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
for more details.

You should have received a copy of the GNU General Public License along
with this program.  If not, see http://www.gnu.org/licenses/. */
package com.db4o.io;

/**
 * Strategy for file/byte array growth by a constant factor
 */
public class ConstantGrowthStrategy implements GrowthStrategy {	
	private final int _growth;
	
	/**
	 * @param growth The constant growth size
	 */
	public ConstantGrowthStrategy(int growth) {
		_growth = growth;
	}
	
	/**
	 * returns the incremented size after the growth 
	 * strategy has been applied
	 * @param curSize the original size
	 * @return the new size
	 */
	public long newSize(long curSize, long requiredSize) {
		long newSize = curSize;
		while(newSize < requiredSize) {
			newSize += _growth;
		}
		return newSize;
	}
}