/*
* This file is part of the Echo Web Application Framework (hereinafter "Echo").
* Copyright (C) 2002-2009 NextApp, Inc.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*/
package nextapp.echo2.testapp.interactive;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import nextapp.echo2.app.util.Uid;
import nextapp.echo2.webcontainer.ContainerContext;
import nextapp.echo2.webrender.ClientProperties;
import nextapp.echo2.webrender.Connection;
import nextapp.echo2.webrender.ContentType;
import nextapp.echo2.webrender.ServerDelayMessage;
import nextapp.echo2.webrender.Service;
import nextapp.echo2.webrender.WebRenderServlet;
import nextapp.echo2.webrender.output.HtmlDocument;
import nextapp.echo2.webrender.output.XmlDocument;
/**
* An example of a more creative <code>ServerDelayMessage</code>.
* <p>
* Creating a custom <code>ServerDelayMessage</code>
* is a fairly advanced activity that requires working with the Echo
* Web Render Engine API.
*/
public class CoolDelayMessage extends ServerDelayMessage {
private static int BUFFER_SIZE = 4096;
private static String IMAGE_RESOURCE_NAME = Styles.IMAGE_PATH + "ShadowOverlay.png";
private static Service IMAGE_SERVICE = new ImageService();
static {
WebRenderServlet.getServiceRegistry().add(IMAGE_SERVICE);
}
private static class ImageService implements Service {
private static final String SERVICE_ID = Uid.generateUidString();
/**
* @see nextapp.echo2.webrender.Service#getId()
*/
public String getId() {
return SERVICE_ID;
}
/**
* @see nextapp.echo2.webrender.Service#getVersion()
*/
public int getVersion() {
return 0;
}
/**
* @see nextapp.echo2.webrender.Service#service(nextapp.echo2.webrender.Connection)
*/
public void service(Connection conn) throws IOException {
conn.setContentType(ContentType.IMAGE_PNG);
OutputStream out = conn.getOutputStream();
InputStream in = null;
byte[] buffer = new byte[BUFFER_SIZE];
int bytesRead = 0;
try {
in = CoolDelayMessage.class.getResourceAsStream(IMAGE_RESOURCE_NAME);
if (in == null) {
throw new IllegalArgumentException("Specified resource does not exist: " + IMAGE_RESOURCE_NAME + ".");
}
do {
bytesRead = in.read(buffer);
if (bytesRead > 0) {
out.write(buffer, 0, bytesRead);
}
} while (bytesRead > 0);
} finally {
if (in != null) { try { in.close(); } catch (IOException ex) { } }
}
}
}
private Element messageElement;
public CoolDelayMessage(ContainerContext containerContext, String messageText) {
XmlDocument xmlDocument = new XmlDocument("div", null, null, HtmlDocument.XHTML_1_0_NAMESPACE_URI);
Document document = xmlDocument.getDocument();
Element divElement = document.getDocumentElement();
divElement.setAttribute("id", ELEMENT_ID_MESSAGE);
divElement.setAttribute("style", "position:absolute;top:0px;left:0px;width:100%;height:100%;cursor:wait;"
+ "margin:0px;padding:0px;visibility:hidden;z-index:10000;");
Element tableElement = document.createElement("table");
tableElement.setAttribute("style", "width:100%;height:100%;border:0px;padding:0px;");
divElement.appendChild(tableElement);
Element tbodyElement = document.createElement("tbody");
tableElement.appendChild(tbodyElement);
Element trElement = document.createElement("tr");
tbodyElement.appendChild(trElement);
Element tdElement = document.createElement("td");
tdElement.setAttribute("style", "width:100%;height:100%;");
tdElement.setAttribute("valign", "middle");
tdElement.setAttribute("align", "center");
trElement.appendChild(tdElement);
Element longDivElement = document.createElement("div");
longDivElement.setAttribute("id", ELEMENT_ID_LONG_MESSAGE);
String longDivStyleText = "color:#4f4f4f;width:277px;padding-top:120px;height:156px;"
+ "font-family:verdana,arial,helvetica,sans-serif;font-size:14pt;font-weight:bold;font-style:italic;"
+ "text-align:center;";
if (containerContext.getClientProperties().getBoolean(ClientProperties.PROPRIETARY_IE_PNG_ALPHA_FILTER_REQUIRED)) {
// Use Internet Explorer PNG filter hack to achieve transparency.
longDivStyleText += "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"
+ containerContext.getServiceUri(IMAGE_SERVICE) + "', sizingMethod='scale')";
} else {
longDivStyleText += "background-image:url(" + containerContext.getServiceUri(IMAGE_SERVICE) + ");";
}
longDivElement.setAttribute("style", longDivStyleText);
longDivElement.appendChild(document.createTextNode(messageText));
tdElement.appendChild(longDivElement);
messageElement = divElement;
}
/**
* @see nextapp.echo2.webrender.ServerDelayMessage#getMessage()
*/
public Element getMessage() {
return messageElement;
}
}