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/*
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* Copyright 2006 Sun Microsystems, Inc. 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. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.swing;
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import java.awt.GraphicsConfiguration;
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import java.awt.Image;
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import java.lang.ref.SoftReference;
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import java.util.Iterator;
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import java.util.LinkedList;
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/**
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* Cache is used to cache an image based on a set of arguments.
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*/
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public class ImageCache {
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// Maximum number of entries to cache
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private int maxCount;
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// The entries.
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final private LinkedList<SoftReference<Entry>> entries;
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public ImageCache(int maxCount) {
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this.maxCount = maxCount;
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entries = new LinkedList<SoftReference<Entry>>();
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}
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void setMaxCount(int maxCount) {
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this.maxCount = maxCount;
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}
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public void flush() {
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entries.clear();
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}
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private Entry getEntry(Object key, GraphicsConfiguration config,
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int w, int h, Object[] args) {
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Entry entry;
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Iterator<SoftReference<Entry>> iter = entries.listIterator();
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while (iter.hasNext()) {
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SoftReference<Entry> ref = iter.next();
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entry = ref.get();
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if (entry == null) {
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// SoftReference was invalidated, remove the entry
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iter.remove();
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}
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else if (entry.equals(config, w, h, args)) {
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// Put most recently used entries at the head
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iter.remove();
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entries.addFirst(ref);
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return entry;
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}
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}
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// Entry doesn't exist
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entry = new Entry(config, w, h, args);
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if (entries.size() >= maxCount) {
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entries.removeLast();
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}
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entries.addFirst(new SoftReference<Entry>(entry));
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return entry;
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}
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/**
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* Returns the cached Image, or null, for the specified arguments.
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*/
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public Image getImage(Object key, GraphicsConfiguration config,
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int w, int h, Object[] args) {
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Entry entry = getEntry(key, config, w, h, args);
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return entry.getImage();
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}
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/**
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* Sets the cached image for the specified constraints.
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*/
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public void setImage(Object key, GraphicsConfiguration config,
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int w, int h, Object[] args, Image image) {
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Entry entry = getEntry(key, config, w, h, args);
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entry.setImage(image);
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}
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/**
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* Caches set of arguments and Image.
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*/
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private static class Entry {
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final private GraphicsConfiguration config;
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final private int w;
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final private int h;
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final private Object[] args;
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private Image image;
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Entry(GraphicsConfiguration config, int w, int h, Object[] args) {
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this.config = config;
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this.args = args;
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this.w = w;
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this.h = h;
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}
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public void setImage(Image image) {
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this.image = image;
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}
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public Image getImage() {
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return image;
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}
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public String toString() {
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String value = super.toString() +
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"[ graphicsConfig=" + config +
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", image=" + image +
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", w=" + w + ", h=" + h;
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if (args != null) {
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for (int counter = 0; counter < args.length; counter++) {
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value += ", " + args[counter];
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}
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}
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value += "]";
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return value;
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}
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public boolean equals(GraphicsConfiguration config,
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int w, int h, Object[] args) {
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if (this.w == w && this.h == h &&
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((this.config != null && this.config.equals(config)) ||
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(this.config == null && config == null))) {
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if (this.args == null && args == null) {
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return true;
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}
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if (this.args != null && args != null &&
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this.args.length == args.length) {
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for (int counter = args.length - 1; counter >= 0;
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counter--) {
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Object a1 = this.args[counter];
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Object a2 = args[counter];
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if ((a1 == null && a2 != null) ||
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(a1 != null && !a1.equals(a2))) {
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return false;
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}
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}
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return true;
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}
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}
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return false;
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}
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}
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}
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