| /* |
| * Copyright 2009-2012 by The Regents of the University of California |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * you may obtain a copy of the License from |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package edu.uci.ics.hyracks.storage.am.lsm.invertedindex.util; |
| |
| import java.util.ArrayList; |
| |
| import edu.uci.ics.hyracks.storage.am.lsm.invertedindex.api.IObjectFactory; |
| |
| public class ObjectCache<T> { |
| protected final int expandSize; |
| protected final IObjectFactory<T> objFactory; |
| protected final ArrayList<T> cache; |
| protected int lastReturned = 0; |
| |
| public ObjectCache(IObjectFactory<T> objFactory, int initialSize, int expandSize) { |
| this.objFactory = objFactory; |
| this.cache = new ArrayList<T>(initialSize); |
| this.expandSize = expandSize; |
| expand(initialSize); |
| } |
| |
| private void expand(int expandSize) { |
| for (int i = 0; i < expandSize; i++) { |
| cache.add(objFactory.create()); |
| } |
| } |
| |
| public void reset() { |
| lastReturned = 0; |
| } |
| |
| public T getNext() { |
| if (lastReturned >= cache.size()) { |
| expand(expandSize); |
| } |
| return cache.get(lastReturned++); |
| } |
| } |