Source Code Cross Referenced for ImageLoader.java in  » 6.0-JDK-Modules » j2me » com » sun » perseus » model » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » com.sun.perseus.model 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *
003:         *
004:         * Copyright  1990-2007 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation.
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt).
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions.
025:         */
026:        package com.sun.perseus.model;
027:
028:        import com.sun.perseus.j2d.RasterImage;
029:
030:        /**
031:         * Interface for handling RasterImage resources loading. Implementations can 
032:         * vary in the way they handle security restrictions, caching or advanced 
033:         * loading policies.
034:         *
035:         * @version $Id: ImageLoader.java,v 1.4 2006/06/29 10:47:32 ln156897 Exp $
036:         */
037:        public interface ImageLoader {
038:            /**
039:             * Resolves the input relative and base URI into an absolute URI
040:             * which can be used in subsequent calls to needsURI, getImageAndWait
041:             * or getImageLater calls.
042:             * @param uri the requested URI content. 
043:             * @param baseURI the base URI. Needed in case uri is relative.
044:             * @return the resolved URI that should be requested in follow on 
045:             *         needsURI, getImageAndWait or getImageLater calls or null if
046:             *         the URI cannot be resolved.
047:             */
048:            String resolveURI(final String uri, final String baseURI);
049:
050:            /**
051:             * Notifies the URILoader that the given uri will be needed.
052:             *
053:             * @param absoluteURI the requested URI content. 
054:             */
055:            void needsURI(final String absoluteURI);
056:
057:            /**
058:             * Requests the given image. This call blocks until an image is
059:             * returned.
060:             *
061:             * @param uri the requested URI. Should be a resolved URI.
062:             * @return the loaded image or the same image as returned by
063:             *         a <code>getBrokenImage</code> call if the image could
064:             *         not be loaded.
065:             */
066:            RasterImage getImageAndWait(final String uri);
067:
068:            /**
069:             * Requests the given image. This call returns immediately and 
070:             * the image is set on the input <code>ImageNode</code> when the
071:             * image becomes available.
072:             *
073:             * @param uri the requested URI. Should be a resolved URI.
074:             * @param imageNode the <code>ImageNode</code> whose image 
075:             *        member should be set as a result of loading the 
076:             *        image.
077:             */
078:            void getImageLater(final String uri,
079:                    final RasterImageConsumer imageNode);
080:
081:            /**
082:             * Returns the image that should be used to represent 
083:             * an image which is loading.
084:             *
085:             * @return the image to use to represent a pending loading.
086:             */
087:            RasterImage getLoadingImage();
088:
089:            /**
090:             * Returns the image that should be used to represent an
091:             * image which could not be loaded.
092:             *
093:             * @return the image to represent broken uris or content.
094:             */
095:            RasterImage getBrokenImage();
096:
097:            /**
098:             * Determines whether this ImageLoader can handle relative uri's
099:             *
100:             * @return true if this ImageLoader can handle relative uri's;
101:             *         false otherwise.
102:             */
103:            boolean allowsRelativeURI();
104:
105:            /**
106:             * Some ImageLoader implementations may wish to wait until the end of the
107:             * Document load to start retrieving resources. This method notifies the
108:             * implementation that the associated DocumentNode completed loading
109:             * successfully.
110:             *
111:             * @param doc the DocumentNode which just finised loading.
112:             */
113:            void documentLoaded(final DocumentNode doc);
114:
115:            /**
116:             * In cases where the ImageLoader may update the images associated to a URI,
117:             * RasterImageConsumer interested in updates need to register their interest
118:             * throught this method.
119:             *
120:             * @param absoluteURI the URI the RasterImageConsumer is interested in.
121:             * @param imageNode the RasterImageConsumer interested in the URI.
122:             */
123:            void addRasterImageConsumer(final String absoluteURI,
124:                    final RasterImageConsumer imageNode);
125:
126:            /**
127:             * In cases where the ImageLoader may update the images associated to a URI,
128:             * RasterImageConsumer interested in updates need to de-register their 
129:             * interest throught this method.
130:             *
131:             * @param absoluteURI the URI the RasterImageConsumer is interested in.
132:             * @param imageNode the RasterImageConsumer interested in the URI.
133:             */
134:            void removeRasterImageConsumer(final String absoluteURI,
135:                    final RasterImageConsumer imageNode);
136:
137:        }
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