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