/*
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on May 27, 2009
*/
package com.bigdata.counters.render;
import com.bigdata.counters.query.ICounterSelector;
import com.bigdata.counters.query.ReportEnum;
import com.bigdata.counters.query.URLQueryModel;
import com.bigdata.util.httpd.NanoHTTPD;
/**
* Factory for {@link IRenderer} objects based on a MIME type. For known MIME
* types, the factory returns an instance of an {@link IRenderer} capable of
* rendering for that MIME type. The instance will then decide whether or not it
* can render the requested {@link ReportEnum} as not all report types can be
* rendered for all MIME types. For example, a request for a graph of the event
* data will fail if the MIME type is <code>text/plain</code>.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class RendererFactory {
/**
* @param model
* Describes the state of the controller (e.g., as parsed from
* the URL query parameters).
* @param counterSelector
* Selects the counters to be rendered.
* @param defaultMimeType
* The negotiated or default MIME type. This can be overridden
* using {@value URLQueryModel#MIMETYPE}.
*
* @return An {@link IRenderer} for that MIME type.
*/
static public IRenderer get(final URLQueryModel model,
final ICounterSelector counterSelector, final String defaultMimeType) {
if (model == null)
throw new IllegalArgumentException();
if (counterSelector == null)
throw new IllegalArgumentException();
if (defaultMimeType == null)
throw new IllegalArgumentException();
final String mimeType = (model.mimeType == null ? defaultMimeType
: model.mimeType);
if (mimeType.startsWith(NanoHTTPD.MIME_TEXT_PLAIN)) {
return new TextRenderer(model, counterSelector);
} else if (mimeType.startsWith(NanoHTTPD.MIME_TEXT_HTML)) {
return new XHTMLRenderer(model, counterSelector);
} else if (mimeType.startsWith(NanoHTTPD.MIME_APPLICATION_XML)) {
/*
* @todo should be the charset specified with the MIME type and
* default per the HTTP RFC when none was specified.
*/
final String charset = "UTF-8";
return new XMLRenderer(model, counterSelector, charset);
} else {
throw new UnsupportedOperationException("mimeType=" + mimeType);
}
}
}