| /* |
| * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.swing; |
| |
| import java.awt.GraphicsConfiguration; |
| import java.awt.Image; |
| import java.lang.ref.SoftReference; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| |
| /** |
| * Cache is used to cache an image based on a set of arguments. |
| */ |
| public class ImageCache { |
| // Maximum number of entries to cache |
| private int maxCount; |
| // The entries. |
| private final LinkedList<SoftReference<Entry>> entries; |
| |
| public ImageCache(int maxCount) { |
| this.maxCount = maxCount; |
| entries = new LinkedList<SoftReference<Entry>>(); |
| } |
| |
| void setMaxCount(int maxCount) { |
| this.maxCount = maxCount; |
| } |
| |
| public void flush() { |
| entries.clear(); |
| } |
| |
| private Entry getEntry(Object key, GraphicsConfiguration config, |
| int w, int h, Object[] args) { |
| Entry entry; |
| Iterator<SoftReference<Entry>> iter = entries.listIterator(); |
| while (iter.hasNext()) { |
| SoftReference<Entry> ref = iter.next(); |
| entry = ref.get(); |
| if (entry == null) { |
| // SoftReference was invalidated, remove the entry |
| iter.remove(); |
| } |
| else if (entry.equals(config, w, h, args)) { |
| // Put most recently used entries at the head |
| iter.remove(); |
| entries.addFirst(ref); |
| return entry; |
| } |
| } |
| // Entry doesn't exist |
| entry = new Entry(config, w, h, args); |
| if (entries.size() >= maxCount) { |
| entries.removeLast(); |
| } |
| entries.addFirst(new SoftReference<Entry>(entry)); |
| return entry; |
| } |
| |
| /** |
| * Returns the cached Image, or null, for the specified arguments. |
| */ |
| public Image getImage(Object key, GraphicsConfiguration config, |
| int w, int h, Object[] args) { |
| Entry entry = getEntry(key, config, w, h, args); |
| return entry.getImage(); |
| } |
| |
| /** |
| * Sets the cached image for the specified constraints. |
| */ |
| public void setImage(Object key, GraphicsConfiguration config, |
| int w, int h, Object[] args, Image image) { |
| Entry entry = getEntry(key, config, w, h, args); |
| entry.setImage(image); |
| } |
| |
| |
| /** |
| * Caches set of arguments and Image. |
| */ |
| private static class Entry { |
| private final GraphicsConfiguration config; |
| private final int w; |
| private final int h; |
| private final Object[] args; |
| private Image image; |
| |
| Entry(GraphicsConfiguration config, int w, int h, Object[] args) { |
| this.config = config; |
| this.args = args; |
| this.w = w; |
| this.h = h; |
| } |
| |
| public void setImage(Image image) { |
| this.image = image; |
| } |
| |
| public Image getImage() { |
| return image; |
| } |
| |
| public String toString() { |
| String value = super.toString() + |
| "[ graphicsConfig=" + config + |
| ", image=" + image + |
| ", w=" + w + ", h=" + h; |
| if (args != null) { |
| for (int counter = 0; counter < args.length; counter++) { |
| value += ", " + args[counter]; |
| } |
| } |
| value += "]"; |
| return value; |
| } |
| |
| public boolean equals(GraphicsConfiguration config, |
| int w, int h, Object[] args) { |
| if (this.w == w && this.h == h && |
| ((this.config != null && this.config.equals(config)) || |
| (this.config == null && config == null))) { |
| if (this.args == null && args == null) { |
| return true; |
| } |
| if (this.args != null && args != null && |
| this.args.length == args.length) { |
| for (int counter = args.length - 1; counter >= 0; |
| counter--) { |
| Object a1 = this.args[counter]; |
| Object a2 = args[counter]; |
| if ((a1 == null && a2 != null) || |
| (a1 != null && !a1.equals(a2))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| return false; |
| } |
| } |
| } |