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| 1 | +/* | |
| 2 | + * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | +package sun.swing; | |
| 26 | + | |
| 27 | +import java.awt.GraphicsConfiguration; | |
| 28 | +import java.awt.Image; | |
| 29 | +import java.lang.ref.SoftReference; | |
| 30 | +import java.util.Iterator; | |
| 31 | +import java.util.LinkedList; | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * Cache is used to cache an image based on a set of arguments. | |
| 35 | + */ | |
| 36 | +public class ImageCache { | |
| 37 | + // Maximum number of entries to cache | |
| 38 | + private int maxCount; | |
| 39 | + // The entries. | |
| 40 | + final private LinkedList<SoftReference<Entry>> entries; | |
| 41 | + | |
| 42 | + public ImageCache(int maxCount) { | |
| 43 | + this.maxCount = maxCount; | |
| 44 | + entries = new LinkedList<SoftReference<Entry>>(); | |
| 45 | + } | |
| 46 | + | |
| 47 | + void setMaxCount(int maxCount) { | |
| 48 | + this.maxCount = maxCount; | |
| 49 | + } | |
| 50 | + | |
| 51 | + public void flush() { | |
| 52 | + entries.clear(); | |
| 53 | + } | |
| 54 | + | |
| 55 | + private Entry getEntry(Object key, GraphicsConfiguration config, | |
| 56 | + int w, int h, Object[] args) { | |
| 57 | + Entry entry; | |
| 58 | + Iterator<SoftReference<Entry>> iter = entries.listIterator(); | |
| 59 | + while (iter.hasNext()) { | |
| 60 | + SoftReference<Entry> ref = iter.next(); | |
| 61 | + entry = ref.get(); | |
| 62 | + if (entry == null) { | |
| 63 | + // SoftReference was invalidated, remove the entry | |
| 64 | + iter.remove(); | |
| 65 | + } | |
| 66 | + else if (entry.equals(config, w, h, args)) { | |
| 67 | + // Put most recently used entries at the head | |
| 68 | + iter.remove(); | |
| 69 | + entries.addFirst(ref); | |
| 70 | + return entry; | |
| 71 | + } | |
| 72 | + } | |
| 73 | + // Entry doesn't exist | |
| 74 | + entry = new Entry(config, w, h, args); | |
| 75 | + if (entries.size() >= maxCount) { | |
| 76 | + entries.removeLast(); | |
| 77 | + } | |
| 78 | + entries.addFirst(new SoftReference<Entry>(entry)); | |
| 79 | + return entry; | |
| 80 | + } | |
| 81 | + | |
| 82 | + /** | |
| 83 | + * Returns the cached Image, or null, for the specified arguments. | |
| 84 | + */ | |
| 85 | + public Image getImage(Object key, GraphicsConfiguration config, | |
| 86 | + int w, int h, Object[] args) { | |
| 87 | + Entry entry = getEntry(key, config, w, h, args); | |
| 88 | + return entry.getImage(); | |
| 89 | + } | |
| 90 | + | |
| 91 | + /** | |
| 92 | + * Sets the cached image for the specified constraints. | |
| 93 | + */ | |
| 94 | + public void setImage(Object key, GraphicsConfiguration config, | |
| 95 | + int w, int h, Object[] args, Image image) { | |
| 96 | + Entry entry = getEntry(key, config, w, h, args); | |
| 97 | + entry.setImage(image); | |
| 98 | + } | |
| 99 | + | |
| 100 | + | |
| 101 | + /** | |
| 102 | + * Caches set of arguments and Image. | |
| 103 | + */ | |
| 104 | + private static class Entry { | |
| 105 | + final private GraphicsConfiguration config; | |
| 106 | + final private int w; | |
| 107 | + final private int h; | |
| 108 | + final private Object[] args; | |
| 109 | + private Image image; | |
| 110 | + | |
| 111 | + Entry(GraphicsConfiguration config, int w, int h, Object[] args) { | |
| 112 | + this.config = config; | |
| 113 | + this.args = args; | |
| 114 | + this.w = w; | |
| 115 | + this.h = h; | |
| 116 | + } | |
| 117 | + | |
| 118 | + public void setImage(Image image) { | |
| 119 | + this.image = image; | |
| 120 | + } | |
| 121 | + | |
| 122 | + public Image getImage() { | |
| 123 | + return image; | |
| 124 | + } | |
| 125 | + | |
| 126 | + public String toString() { | |
| 127 | + String value = super.toString() + | |
| 128 | + "[ graphicsConfig=" + config + | |
| 129 | + ", image=" + image + | |
| 130 | + ", w=" + w + ", h=" + h; | |
| 131 | + if (args != null) { | |
| 132 | + for (int counter = 0; counter < args.length; counter++) { | |
| 133 | + value += ", " + args[counter]; | |
| 134 | + } | |
| 135 | + } | |
| 136 | + value += "]"; | |
| 137 | + return value; | |
| 138 | + } | |
| 139 | + | |
| 140 | + public boolean equals(GraphicsConfiguration config, | |
| 141 | + int w, int h, Object[] args) { | |
| 142 | + if (this.w == w && this.h == h && | |
| 143 | + ((this.config != null && this.config.equals(config)) || | |
| 144 | + (this.config == null && config == null))) { | |
| 145 | + if (this.args == null && args == null) { | |
| 146 | + return true; | |
| 147 | + } | |
| 148 | + if (this.args != null && args != null && | |
| 149 | + this.args.length == args.length) { | |
| 150 | + for (int counter = args.length - 1; counter >= 0; | |
| 151 | + counter--) { | |
| 152 | + Object a1 = this.args[counter]; | |
| 153 | + Object a2 = args[counter]; | |
| 154 | + if ((a1 == null && a2 != null) || | |
| 155 | + (a1 != null && !a1.equals(a2))) { | |
| 156 | + return false; | |
| 157 | + } | |
| 158 | + } | |
| 159 | + return true; | |
| 160 | + } | |
| 161 | + } | |
| 162 | + return false; | |
| 163 | + } | |
| 164 | + } | |
| 165 | +} | |