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100 lines
3.1 KiB
Java
100 lines
3.1 KiB
Java
/*
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* Copyright (c) 1995, 2014, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.applet;
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import java.awt.Toolkit;
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import java.awt.Image;
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import java.lang.ref.SoftReference;
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import sun.awt.image.URLImageSource;
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import java.net.URL;
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@Deprecated(since = "9")
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class AppletImageRef {
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private SoftReference<Image> soft = null;
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URL url;
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/**
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* Returns a pointer to the object referenced by this Ref. If the object
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* has been thrown away by the garbage collector, it will be
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* reconstituted. This method does everything necessary to ensure that the garbage
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* collector throws things away in Least Recently Used(LRU) order. Applications should
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* never override this method. The get() method effectively caches calls to
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* reconstitute().
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*/
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public synchronized Image get() {
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Image t = check();
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if (t == null) {
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t = reconstitute();
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setThing(t);
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}
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return t;
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}
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/**
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* Create the Ref
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*/
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AppletImageRef(URL url) {
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this.url = url;
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}
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/**
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* Flushes the cached object. Forces the next invocation of get() to
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* invoke reconstitute().
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*/
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public synchronized void flush() {
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SoftReference<Image> s = soft;
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if (s != null) s.clear();
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soft = null;
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}
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/**
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* Sets the thing to the specified object.
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* @param thing the specified object
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*/
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public synchronized void setThing(Image thing) {
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flush();
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soft = new SoftReference<>(thing);
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}
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/**
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* Checks to see what object is being pointed at by this Ref and returns it.
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*/
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public synchronized Image check() {
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SoftReference<Image> s = soft;
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if (s == null) return null;
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return s.get();
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}
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/**
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* Reconsitute the image. Only called when the ref has been flushed.
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*/
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public Image reconstitute() {
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Image img = Toolkit.getDefaultToolkit().createImage(new URLImageSource(url));
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return img;
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}
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}
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