Showing the changes to java/pkg/sun/swing/ImageCache.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,165 @@ | |||
| 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 | } | ||