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

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Java Source Code / Java Documentation » Ajax » NextApp Echo2 » nextapp.echo2.webrender 
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.webrender;
031:
032:        import java.io.IOException;
033:        import java.io.InputStream;
034:        import java.io.Serializable;
035:
036:        import javax.xml.parsers.DocumentBuilder;
037:        import javax.xml.parsers.DocumentBuilderFactory;
038:        import javax.xml.parsers.ParserConfigurationException;
039:
040:        import org.w3c.dom.Document;
041:        import org.w3c.dom.Element;
042:        import org.xml.sax.SAXException;
043:
044:        /**
045:         * Representation of a client/server-interaction delay message.
046:         * Client/server-interaction delay messages are presented to the user
047:         * while the client is communicating synchronously with the server. 
048:         */
049:        public abstract class ServerDelayMessage implements  Serializable {
050:
051:            /**
052:             * The element id of the "main delay message" element which will be made
053:             * visible when the any client/server interaction occurs.
054:             */
055:            public static final String ELEMENT_ID_MESSAGE = "serverDelayMessage";
056:
057:            /**
058:             * The element id of the "long delay message" element which will be made 
059:             * visible when the delay pane has been displayed for a set amount
060:             * of time. 
061:             */
062:            public static final String ELEMENT_ID_LONG_MESSAGE = "serverDelayMessageLong";
063:
064:            /**
065:             * Creates a new concrete <code>ServerDelayMessage</code> implementation 
066:             * based on the HTML fragment contained in the specified 
067:             * <code>CLASSPATH</code> resource
068:             * 
069:             * @param resourceName the <code>CLASSPATH</code> resource containing the
070:             *        HTML fragment
071:             * @return the created <code>ServerDelayMessage</code>
072:             * @throws IOException if the resource cannot be found or parsed
073:             */
074:            public static ServerDelayMessage createFromResource(
075:                    String resourceName) throws IOException {
076:                Document document;
077:                InputStream in = null;
078:                try {
079:                    DocumentBuilderFactory factory = DocumentBuilderFactory
080:                            .newInstance();
081:                    DocumentBuilder builder = factory.newDocumentBuilder();
082:                    in = ServerDelayMessage.class
083:                            .getResourceAsStream(resourceName);
084:                    if (in == null) {
085:                        throw new IOException("Resource not found: "
086:                                + resourceName + ".");
087:                    }
088:                    document = builder.parse(in);
089:                } catch (ParserConfigurationException ex) {
090:                    throw new IOException("Failed to parse InputStream.");
091:                } catch (SAXException ex) {
092:                    throw new IOException("Failed to parse InputStream.");
093:                } finally {
094:                    if (in != null) {
095:                        try {
096:                            in.close();
097:                        } catch (IOException ex) {
098:                        }
099:                    }
100:                }
101:
102:                final Element messageElement = document.getDocumentElement();
103:                return new ServerDelayMessage() {
104:
105:                    /**
106:                     * @see nextapp.echo2.webrender.ServerDelayMessage#getMessage()
107:                     */
108:                    public Element getMessage() {
109:                        return messageElement;
110:                    }
111:                };
112:            }
113:
114:            /**
115:             * Returns the message content as an HTML element
116:             * 
117:             * @return the HTML element
118:             */
119:            public abstract Element getMessage();
120:        }
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