/*
* 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.webcontainer.image;
import java.io.IOException;
import nextapp.echo2.app.ImageReference;
import nextapp.echo2.app.StreamImageReference;
import nextapp.echo2.webrender.Connection;
import nextapp.echo2.webrender.ContentType;
import nextapp.echo2.webrender.WebRenderServlet;
/**
* Renders a <code>StreamImageReference</code> to the client.
*/
public class StreamImageService extends AbstractImageService {
/** <code>Service</code> identifier. */
private static final String SERVICE_ID = "Echo.StreamImage";
/** Singleton instance of this <code>Service</code>. */
public static final StreamImageService INSTANCE = new StreamImageService();
static {
WebRenderServlet.getServiceRegistry().add(INSTANCE);
}
/**
* @see nextapp.echo2.webrender.Service#getId()
*/
public String getId() {
return SERVICE_ID;
}
/**
* @see nextapp.echo2.webrender.Service#getVersion()
*/
public int getVersion() {
return 0; // Enable caching.
}
/**
* @see nextapp.echo2.webcontainer.image.AbstractImageService#renderImage(
* nextapp.echo2.webrender.Connection, nextapp.echo2.app.ImageReference)
*/
public void renderImage(Connection conn, ImageReference imageReference)
throws IOException {
try {
if (!(imageReference instanceof StreamImageReference)) {
throw new IOException("Image is not a StreamImageReference.");
}
StreamImageReference streamImageReference = (StreamImageReference) imageReference;
conn.setContentType(new ContentType(streamImageReference.getContentType(), true));
streamImageReference.render(conn.getOutputStream());
} catch (IOException ex) {
// Internet Explorer appears to enjoy making half-hearted requests for images, wherein it resets the connection
// leaving us with an IOException. This exception is silently eaten.
// It would preferable to only ignore SocketExceptions, however the API documentation does not provide
// enough information to suggest that such a strategy would be adequate..
}
}
}