1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.g2d.image.impl;
14 import java.lang.ref.WeakReference;
16 import org.simantics.g2d.image.Image;
17 import org.simantics.utils.datastructures.cache.IProvider;
18 import org.simantics.utils.datastructures.cache.ProvisionException;
20 public class CacheProvider extends AbstractProviderProxy {
22 WeakReference<Image> ref;
24 public CacheProvider(IProvider<Image> source) {
29 public synchronized Image get() throws ProvisionException {
32 if (x==null) ref=null; else return x;
34 Image x = source.get();
35 ref = new WeakReference<Image>(x);