/*
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 java.io.IOException;
import java.io.Writer;
import com.bigdata.counters.CounterSet;
import com.bigdata.counters.ICounter;
import com.bigdata.counters.query.ICounterSelector;
import com.bigdata.counters.query.URLQueryModel;
/**
* Renders the selected counters using the counter set XML representation - the
* client can apply XSLT as desired to style the XML.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
*/
public class XMLRenderer implements IRenderer {
/**
* Describes the state of the controller.
*/
private final URLQueryModel model;
/**
* Selects the counters to be rendered.
*/
private final ICounterSelector counterSelector;
/**
* The selected character set encoding.
*/
private final String charset;
/**
* @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 charset
* The selected character set encoding.
*/
public XMLRenderer(final URLQueryModel model,
final ICounterSelector counterSelector, final String charset) {
if (model == null)
throw new IllegalArgumentException();
if (counterSelector == null)
throw new IllegalArgumentException();
if (charset == null)
throw new IllegalArgumentException();
this.model = model;
this.counterSelector = counterSelector;
this.charset = charset;
}
@Override
public void render(final Writer w) {
final CounterSet counterSet = new CounterSet();
@SuppressWarnings("rawtypes")
final ICounter[] counters = counterSelector.selectCounters(model.depth,
model.pattern, model.fromTime, model.toTime, model.period,
false/* historyRequired */);
/*
* Apply an optional constraint on the path prefix.
*
* TODO push down into the ICounterSelector. This will be more
* efficient.
*/
final String pathPrefix = model.path != null && model.path.length() > 0 ? model.path
: null;
for (ICounter<?> counter : counters) {
if (pathPrefix != null) {
if (!counter.getPath().startsWith(pathPrefix)) {
continue;
}
}
counterSet.makePath(counter.getParent().getPath()).attach(counter);
}
try {
counterSet.asXML(w, charset, null/* filter */);
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}
}