Source Code Cross Referenced for Images.java in  » GIS » udig-1.1 » net » refractions » udig » validation » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » udig 1.1 » net.refractions.udig.validation 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    uDig - User Friendly Desktop Internet GIS client
003:         *    http://udig.refractions.net
004:         *    (C) 2004, Refractions Research Inc.
005:         *
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation;
009:         *    version 2.1 of the License.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         *
016:         */
017:        package net.refractions.udig.validation;
018:
019:        import java.net.MalformedURLException;
020:        import java.net.URL;
021:
022:        import org.eclipse.jface.resource.ImageDescriptor;
023:        import org.eclipse.jface.resource.ImageRegistry;
024:        import org.eclipse.swt.graphics.Image;
025:
026:        /**
027:         * The image descrptors for the plugin
028:         */
029:        public class Images {
030:
031:            /** Hashtable of ImageDescriptors */
032:            private ImageRegistry imageCache;
033:            private URL baseURL;
034:
035:            /**
036:             * Creates an image descriptor for later use.
037:             */
038:            synchronized ImageDescriptor create(String id) {
039:                URL url = null;
040:                try {
041:                    url = new URL(baseURL, id);
042:                } catch (MalformedURLException e) {
043:                    return null;
044:                }
045:                ImageDescriptor image = ImageDescriptor.createFromURL(url);
046:                imageCache.put(id, image);
047:                return image;
048:            }
049:
050:            /**
051:             * Returns the image descriptor for ID, or null if not found.
052:             * <p>
053:             * Images are from CatalogUIPlugin.getDefault().getImages()
054:             * </p>
055:             * @param id
056:             * @return ImageDescriptor, or null if there is no such image.
057:             */
058:            public static ImageDescriptor getDescriptor(String id) {
059:                Images images = ValidationPlugin.getDefault().getImages();
060:                ImageDescriptor found = images.imageCache.getDescriptor(id);
061:                if (found != null) {
062:                    return found;
063:                }
064:                return images.create(id);
065:            }
066:
067:            /**
068:             * Initializes the table of images used in this plugin.
069:             * <p>
070:             * The Images from ISharedImages will be registered with
071:             * CatalogUIPlugin.getDefault().getImageRegistry().
072:             * @param url
073:             * @param shared
074:             */
075:            public synchronized void initializeImages(URL url,
076:                    ImageRegistry shared) {
077:                imageCache = shared;
078:                baseURL = url;
079:
080:                // objects        
081:                create(ImageConstants.IMAGE_WIZBAN);
082:            }
083:
084:            /**
085:             * Cleanup image cache.
086:             */
087:            public void cleanUp() {
088:                imageCache = null; // Display shutdown will clear imageCache        
089:            }
090:
091:            public ImageDescriptor getImageDescriptor(String id) {
092:                return getDescriptor(id);
093:            }
094:
095:            /**
096:             * Returns the image associated with the given key, or <code>null</code> if none.
097:             * 
098:             * @param id the key
099:             * @return the image, or <code>null</code> if none
100:             */
101:            public Image get(String id) {
102:                Image image = imageCache.get(id);
103:                if (image != null)
104:                    return image;
105:
106:                create(id);
107:                return imageCache.get(id);
108:            }
109:
110:        }
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