Source Code Cross Referenced for AwtImageReference.java in  » Ajax » NextApp-Echo2 » nextapp » echo2 » app » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Ajax » NextApp Echo2 » nextapp.echo2.app 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* 
002:         * This file is part of the Echo Web Application Framework (hereinafter "Echo").
003:         * Copyright (C) 2002-2005 NextApp, Inc.
004:         *
005:         * Version: MPL 1.1/GPL 2.0/LGPL 2.1
006:         *
007:         * The contents of this file are subject to the Mozilla Public License Version
008:         * 1.1 (the "License"); you may not use this file except in compliance with
009:         * the License. You may obtain a copy of the License at
010:         * http://www.mozilla.org/MPL/
011:         *
012:         * Software distributed under the License is distributed on an "AS IS" basis,
013:         * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
014:         * for the specific language governing rights and limitations under the
015:         * License.
016:         *
017:         * Alternatively, the contents of this file may be used under the terms of
018:         * either the GNU General Public License Version 2 or later (the "GPL"), or
019:         * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
020:         * in which case the provisions of the GPL or the LGPL are applicable instead
021:         * of those above. If you wish to allow use of your version of this file only
022:         * under the terms of either the GPL or the LGPL, and not to allow others to
023:         * use your version of this file under the terms of the MPL, indicate your
024:         * decision by deleting the provisions above and replace them with the notice
025:         * and other provisions required by the GPL or the LGPL. If you do not delete
026:         * the provisions above, a recipient may use your version of this file under
027:         * the terms of any one of the MPL, the GPL or the LGPL.
028:         */
029:
030:        package nextapp.echo2.app;
031:
032:        import java.awt.Image;
033:        import java.awt.Toolkit;
034:        import java.awt.image.ColorModel;
035:        import java.awt.image.ImageObserver;
036:        import java.awt.image.MemoryImageSource;
037:        import java.awt.image.PixelGrabber;
038:        import java.io.IOException;
039:        import java.io.ObjectInputStream;
040:        import java.io.ObjectOutputStream;
041:
042:        /**
043:         * An ImageReference describing an image which may be rendered from
044:         * a <code>java.awt.Image</code>.
045:         * Note that the JVM running the Echo Application Container will require 
046:         * access to a graphics context for the Java AWT to function.
047:         */
048:        public class AwtImageReference implements  ImageReference {
049:
050:            private transient Image image;
051:            private String id;
052:
053:            /**
054:             * Default constructor for use only when a class is derived from 
055:             * <code>AwtImageReference</code> and the 
056:             * <code>getImage()</code> method is overridden.
057:             */
058:            public AwtImageReference() {
059:                this (null);
060:            }
061:
062:            /**
063:             * Creates an <code>AwtImageReference</code> to the specified 
064:             * <code>java.awt.Image</code>.
065:             * Note that changes to the underlying image will not necessarily be 
066:             * reflected on the client unless the image-containing property of the 
067:             * target component is update.
068:             *
069:             * @param image the <code>java.awt.Image </code>to be displayed.
070:             */
071:            public AwtImageReference(Image image) {
072:                super ();
073:                this .image = image;
074:                id = ApplicationInstance.generateSystemId();
075:            }
076:
077:            /**
078:             * @see java.lang.Object#equals(java.lang.Object)
079:             */
080:            public boolean equals(Object o) {
081:                if (!(o instanceof  AwtImageReference)) {
082:                    return false;
083:                }
084:                AwtImageReference that = (AwtImageReference) o;
085:                if (!(this .image == that.image || (this .image != null && this .image
086:                        .equals(that.image)))) {
087:                    return false;
088:                }
089:                return true;
090:            }
091:
092:            /**
093:             * @see nextapp.echo2.app.ImageReference#getHeight()
094:             */
095:            public Extent getHeight() {
096:                if (image == null) {
097:                    return null;
098:                }
099:                int height = image.getHeight(null);
100:                if (height > 0) {
101:                    return new Extent(height, Extent.PX);
102:                } else {
103:                    return null;
104:                }
105:            }
106:
107:            /**
108:             * @see nextapp.echo2.app.RenderIdSupport#getRenderId()
109:             */
110:            public String getRenderId() {
111:                return id;
112:            }
113:
114:            /**
115:             * Retrieves the image.  Calls to this method will be minimized such that
116:             * applications may extend this class and override this method such that
117:             * images are created only when they are needed, thereby reducing memory
118:             * usage at the cost of increased processor workload.
119:             * You should also override the <code>getWidth()</code> and 
120:             * <code>getHeight()</code> methods.
121:             */
122:            public Image getImage() {
123:                return image;
124:            }
125:
126:            /**
127:             * @see nextapp.echo2.app.ImageReference#getWidth()
128:             */
129:            public Extent getWidth() {
130:                if (image == null) {
131:                    return null;
132:                }
133:                int width = image.getWidth(null);
134:                if (width > 0) {
135:                    return new Extent(width, Extent.PX);
136:                } else {
137:                    return null;
138:                }
139:            }
140:
141:            /**
142:             * @see java.io.Serializable
143:             */
144:            private void readObject(ObjectInputStream in) throws IOException,
145:                    ClassNotFoundException {
146:                in.defaultReadObject();
147:
148:                int width = in.readInt();
149:                int height = in.readInt();
150:                int[] pixels = (int[]) in.readObject();
151:
152:                if (pixels != null) {
153:                    Toolkit toolkit = Toolkit.getDefaultToolkit();
154:                    ColorModel colorModel = ColorModel.getRGBdefault();
155:                    image = toolkit.createImage(new MemoryImageSource(width,
156:                            height, colorModel, pixels, 0, width));
157:                }
158:            }
159:
160:            /**
161:             * @see java.io.Serializable
162:             */
163:            private void writeObject(ObjectOutputStream out) throws IOException {
164:                out.defaultWriteObject();
165:
166:                int width = image.getWidth(null);
167:                int height = image.getHeight(null);
168:
169:                out.writeInt(width);
170:                out.writeInt(height);
171:
172:                if (image == null) {
173:                    out.writeObject(null);
174:                } else {
175:                    int[] pixels = new int[width * height];
176:                    try {
177:                        PixelGrabber pg = new PixelGrabber(image, 0, 0, width,
178:                                height, pixels, 0, width);
179:                        pg.grabPixels();
180:                        if ((pg.getStatus() & ImageObserver.ABORT) != 0) {
181:                            throw new IOException(
182:                                    "Unable to serialize java.awt.image: PixelGrabber aborted.");
183:                        }
184:                    } catch (InterruptedException ex) {
185:                        throw new IOException(
186:                                "Unable to serialize java.awt.Image: PixelGrabber interrupted.");
187:                    }
188:                    out.writeObject(pixels);
189:                }
190:            }
191:        }
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