Pool.java

/*    Dice in the dark. D & D app for the blind and seeing impaired,
*    Copyright (C) <2013r>  <Lovisa Irpa Helgadottir>
*
*    This program is free software: you can redistribute it and/or modify
*    it under the terms of the GNU General Public License as published by
*    the Free Software Foundation, either version 3 of the License, or
*    (at your option) any later version.
*
*    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 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.plovergames.framework;

import java.util.ArrayList;
import java.util.List;

public class Pool<T> {
	
    public interface PoolObjectFactory<T> {
        public T createObject();
    }

    private final List<T> freeObjects;
    private final PoolObjectFactory<T> factory;
    private final int maxSize;

    public Pool(PoolObjectFactory<T> factory, int maxSize) {
        this.factory = factory;
        this.maxSize = maxSize;
        this.freeObjects = new ArrayList<T>(maxSize);
    }

    public T newObject() {
        T object = null;

        if (freeObjects.isEmpty())
            object = factory.createObject();
        else
            object = freeObjects.remove(freeObjects.size() - 1);
        return object;
    }

    public void free(T object) {
        if (freeObjects.size() < maxSize)
            freeObjects.add(object);
    }
}